Asfronomy AS1ROPHYSICS

1979A&A....71..319S Astron. 1 The 2 Summary. astronomical concentrations Belt F. A plane Lupus Received mean about I. Key Belt, there. associations Lupus rotating follow dust Gould's plane. stars. structure (1974), * 14%, 01243 tion, herein pansion Stothers and expanding Send lnstituto Instituto The Introduction plane M. Present Davies from offprint outlined words: Structure giving has Sao formulated total indicating of Strauss Finally, © Astrophys. 7% gas referred a section early A herein December or age Belt self-gravitating (1977); great the European de Paulo Argentino of been review A I= concentration is groups oscillating density requests address: Fisica, (1960) this of a Gould's radioastronomical 1 gas is in comparative on data *, referred the are total 300°-12°. SP, analysed circle around of to an that W. 71, the system the that 5, is of of by associated Universidade as Brasil. possibility the to: de affected expanding served was of 1977; 319-325 CRAAM/ON/CNPq, slightly G. mass sky form of tilted the LGSS, Radioastronomia, Gotild's Blaauw Southern Belt F. rigidly 0.23 star Sco-Cen 5 to the L. made is model by M. by 10 revised Two the available as to of Poeppel given of study Me 7 - gas by by formation Strauss the Lesh (1979) yr. below They with is prove hydrogen SF. that -7 complex neutral Federal (1952), about of strong gas differential by pc- discussed. was brighter May studies Belt association. by (1968) of The Observatory 10 a Sco Lindblad Gould's 2 applied 3 the dynamics that information Stothers 6 and applied 8, section in optical 18° Me, do Casilla neutral hydrogen. OB2 kinematics 1978 to. is of content the optical of OB Rua and E. Rio a large a to less derive stars, out galactic the Belt Lilley and R. plane et stars, de to the Grande of and Frogel and The Ceara, - al. hydrogen Vieira advanced theory of Correo obtain equator. is with Gould's is gas amount galactic on (1973), an In Frogel radio­ of which stellar (1955) of which about either mean • rota­ do and and 290, 1 the the the Provided the the ex­ N° of Sui, a 5, there of 90000 relevant which ll. Sect. gravitating density low in tilt mass study galactic galactic radial resolved Neutral Sect. a thave narrowed tion longitude, IAU therefore Villa runs with have velocity. plane predicts in 300°-360°. wide In a) Combining b) Lupus, the neutral Neutral of velocity Elisa, the between hydrogen with Porto VII. SF In negative galactic by in II their at is the the velocity range Lindblad sectors and contributions longitude I to present hydrogen the a V, and found in the the In easier = down layer, Prov. properties while differential Alegre central Gould's hydrogen Hydrogen Gould's paucity model total > 21 25° these in form makes second III; NASA 9° plane; both radial 2 I= em is galactic near Buenos that to km as work and Sect. and ± (1967) RS, mass in plane I study. in spectra. 325°-85° follows: associated of two to 1 criteria, in s- of Belt Belt OB the o it V, our velocities, Brasil of it 18° Data and near is Sect. and we neutral VI Astrophysics rotation 1 Aires, which of the latitude difficult detailed runs = inclined quadrants (a large a called range stars associated conclusions in gas from the analyze deals below 0) b fourth minimum data The IV the the Argentina and = farthest AS1ROPHYSICS for system, Gould's which belonging with hydrogen. ASfRONOMY 0 the causes 0, thus with "feature b; we most hydrogen southern to 18° optimal at neutral ;:5 to I I= new and according = quadrant galactic I the separate Gould's V, apply with ± estimate avoiding = the has and to 155°-180° are 145°-256° favourable above limits 21 Belt most AND Data ;:5 1 205° model o reduce to problem hydrogen em regions 8 A". In summarized to positive the fraction hemisphere. Gould's concentration a km can plane, Gould's the hydrogen the the to line Sect. Belt from ± System plane of superposi­ the However, s- of LGSS 1 be standard blending range and the o. galactic galactic data regions 1 can covers of and LGSS • radial V Thus, easily mean other Belt, data This self­ Belt Belt I the we be its of in in in = to is 1979A&A....71..319S 320 intensity Fig. (lower line (upper ground Belt, are positive from w ~ It It :::J of Olano data, Q. the w ~ w ~ w it 346°-350° (.!) z Data ~ ~ profiles I m of galactic occurring superimposed many range. assymetric as emitted at rather peak + procedure Tc brightness background 40 40 60 17°; An 20 20 availability, we lower 2 © ok===~~~~~~~~~~--~~ a o'r---+---+---+---+---._~ = 1. profile. velocity I= km at an at at shoulder panel) panel) T(VJ- European Portions values. inspection assumed et constant Fig. componenents, Tc I= extensive each plane of intervals by V 155°-180° b. s- al., latitude. is = close for The to temperature 1 In the gas the I the accurately profile. • 320°-345° with 4 1977) · point shows -40 handle contribution km a the Therefore, on of by Belt b line 0.5[T(VL dashed brightness belonging on width to single RADIAL = two Eq. of s-•, survey of a separation equal separation In have present that gas emitted Southern the the consist at + weak 18°-20°, such 1°, Since the the (I) this given 21 appears T(VL line we dominates negative narrow velocity covers extended positive from for extending Tc em (Poeppel latter, data -20 + a emission, mass are to VELOCITY we by temperature, represents by with paper of profile, · at line 10 - by b the hydrogen for only Eq. I= only the the have showed line + = km 10 higher Observatory of the profiles. the predicted b velocity Belt computing this (1}. the a as average we km 300°-12° second and data. and s- dominates interested as over 18°-+26°; total a interpolation belt to probably devised the Near 0 region shoulder 1 profile seems ( are s- well ) belonging Vieira, KM the latitudes +4 that I= At We 1 interpolated gas at )) a of discussing region. side the of by as S- channel width channel higher forb= 106 wide to 325°-360° to far eliminate appears and 1344 two 1 galactic in a a another on LGSS. the ) made 197 of maintain +20 include to simplified obtaining values a and • from corrected Because the or its 4, latitudes complex spectra, formula velocity a Gould's points. Provided 1977; +3°• up more wide, back­ plane data peak only It I= one line the the all (1) at of of is a where gaussian estimate a.,= A within relative profiles background, and regions reasons gaussian optical ture blending galactic the usually van Therefore, to arid probably gaussian to 4 3140, interpolated while and of confidence Tc Eq. ..., ~eo centered lower Fig. the not It W It ~ :J ILl D. w ~ ~ V While km The shift by the 40 = 20 low the is o~~~~~~~~~~~~ corrected for overestimates, assumed dumpiness galactic (1). 2. Woerden, T. corrected 2.5 o- 4 s- Fig. curve, practically the T(4) Belt velocity km VL a Brightness VL far following ambiguous, Tc show of error depth brightness. must 1 are around many km A few and temperature of analysis, line is s not GALACTIC for is 2 3 = NASA gas the from -• few in most corrected shows the plane, s-1, the against the from Eq. K. s• as that of Belt the be number centered I= may authors less profile line km Tc VL 1966). b negative exist background, a 0.03% Strong the temperature peak value simple ~ symmetric (1) assumed, important, predicted adopted function values: at the as Gould's Eq. superimposed 330°-12°. the s- but Astrophysics reliable gas. not away Figure 11° giving galactic by along least LATITUDE gives it. 1 a profile. run 1o- And is data (1) prefer it temperature, Eq. of be given function which at for blending values Firstly, Secondly, is gaussian procedure from of in of gaussian, gives different VL Belt procedure. the (1), components the still 1 unimportant VL than by thirdly, which at to uncorrected the about latitude. plane I= When shows saturation a Therefore, by 2 = galactic is as 1s• the line peak obtain shows with gaussian appears of VL results . present · far an of near 315°-329°, LOSS's the may '., model Tc km on with will may of will almost b Data gaussian results or latitude if necessary two less temperature While a velocity but outlined occurred ;::;; longitude sight, more s- the velocity maximum the even cause that more a cause produce well 11°, (Takakubo case. analysis, be of forb 1 a T(V was than typical tests symmetrical modeL System values the spin straight for depending plane, a the symmetrical. different cumbersome are at defined clearly which both rounded 4 = and line analysis .. dispersion upper an the > I T(V) ' in I= .... above gradients tempera­ peak made I= = away accurate ' profiles, 5°. a . used km several regions ,, with under­ 340° For ..: whose noise. where under ',.' 300"- VL in non­ 340°. curve, gives .. line • line and fro~ due was s- peak for . on off in for the ·is = in is a a 1 ) . :.:· ~~- .. 1979A&A....71..319S F. Because spacing crowding the the b~~~~~~~~==~~~~~~--~~ errors intensity extent galactic (1958) which of nebulae; b to with low and Lupus the precisely of Fig. the m. view plane derive longitude Because latitude Belt, the represent 'Tc(O) M. Figure a) = b) c) avoid Lindblad these broad limited observer intensity corresponding rather Gas 17°, D © • • Strauss 3 For stellar The of For =-In we discussed belongs are of predominate. as Loop, (20 European T 20K( T some the of 0 0 plane. stars 3 individual while we Content in (20K dropping the and of I )40K members defined features I select the optical is K) extent the patchy. centered > eta!.: < subgroups this Tc(40K accuracy (1967), a the map (1 obtain region. gas near 330°, a representative was are the 330° to brightness contour the approximate Three - above. nearby direction. a the observed Structure of of layer. by with associated used equator Lupus Tc(O)/T.) shown neutral the rather peak of This (Fig. stars, LGSS, both the our the Southern Belt, the at B SF, of the like map concentrations for edge detail Several supernova stars System. 21 Belt This agrees optical I= ±I diagram Scorpius-Centaurus in 3) runs there are in section away broad of hydrogen the a:nd em clumpiness, Scorpius of of o the the Fig. Gould's nature of 2°. with average is that also of is that isophotes Tc data. about Gould's Grape with exists aspects an quite central marginally depth Observatory the from intensity ·3 in Averaging region around shown may emission of according remnant, are expanding galactic of Belt optical models concentrations OB2 3° a conspicuous, Fig. parameters (1975) is and not of Eq. insensitive are gross plane in and Belt, above given covering in is near I order large be 4a. apparent: (1), Fig. significant = towards equator, coordinates. or such much which in is Tc association correlation to real; of plotted 340°. gas by reflection I the also Let a + + 3. to order angular = the at Bertiau • as coarse to of Many avoid· 15° lower cloud thus, mean place 350°, Provided with tend Tc(O) in each that The gas; and the the the (2) in in to in IN a GOULD'S NEUTRAL to where profile, where NH(O) cus) gas hydrogen Optical (1967), From (e.g., of is ture regions. while so where hydrogen Figs. regions. ture the the more be that the text by data. T. the has 4a we HYDROGEN an LGSS; uniform. of T. T. Fig. k as BELT av the all data with uncertain; and and The existence is Belt A + + neutral is upper The is a 5" observed approximately number = atom, Boltzmann's function energy the 4a, lower expressed b. listed lines NASA Astrophysics by 2.5 has parameters velocity Hughes Filled spin Tc(O) limit If SF km represent hydrogen which in an limit is the density of of the Fig. coordinates. schematically and brightness belonging indicate Table Frogel, Loop, 10" temperature circles: (Tc s- equatorial thermal, is ~ GALACTIC galactic is dispersion low observation and optical that 1 is 37 constant used yields degrees 3. ~ the for la models the a the is K, Contour 57 1974). corrected (in supernova temperatures Routledge, given and that LATITUDE Gould's latitude optical in given to highest K and i.e. 757 temperature 15° depth atoms Fig. same Gould's depth b Also Kelvin from the of in The and at av, if respectively K. according by of 4a this map averaged the peak there equator position I= Belt. dashed remnant mH the Sect. has brightness cm- Data molecular shown We and extent, X Belt Belt and direction 1972) of brightness is 341°, of column is a b in IV have The 3 the T. corrected no pc) (Bertiau, in 300 are circle gas, gaussian av System (Stothers of and to are the two is mass in value in turbulence the explained b calculate_d is the pc. Lindblad radiation assumed tempera­ evidence V km (Ophiu­ indicates = longitude B density densest tempera­ galactic fitted Lupus If mean of +9j, 1958) ofT. peak stars a. b. s line and 321 the - (3) the (4) (5) 1 to in • 1979A&A....71..319S a. Table 322 Adopted T, (K) 750 135 Adopted b. (K) T, 120 nH(O) the (4) and smaller atoms IV. To latitude of assume motion; expected coordinate. fact 60 Clube stars, solution and 60 where height given and H Gould's Lupus Camm self-gravitating and The © extract eighth = Dynamical is 1. Lindblad Poisson G forT.= uv(27TGpT(0))- found European em-s. by not H 31.7 Parameters p) (pc) (pc) 31.7 31.7 (pc) H PT(z) z 10 (1967), 13 the is mean concentration that dimensions, variation above its Belt to the (1950) column very more parameters mass The is have uv the equations gravitational absolute (1967) the 60, the applying Model ~ sensitive has stars, physical 300 X system 300 300 (pc) elements A 40 40 of 3 the of gas total 135 mean of Southern model km 112 solved found Table obtained Tc formed same and given height and s for mass consists plane, - a to one information gas 1 have R constant. 400 400 400 simultaneously (pc) (pc) • D 170 170 stars. 750 stream this la, uv T distribution above. layers •. density is, recently needs Observatory = H is K the a Davies case using of The r.m.s. is 2.5 about using solution a The larger plane a. 2.5 2.5 a (km 2.5 km characteristic a. (km obtaining 1.0 1.0 (stars gas from out Eq. (1960), model. velocity 0.6 result, Eq. s- s- and s- is the of parallel (6), 1 density 1 1 plus the } atoms ) in (2), to this for motion. Boltzmann Tc(O) (K) 37 assuming 37 37 Tc(O) (K) shown turbulent 51 51 We • observed the uv Ill gas) the (3) gas, Provided in em-s layers height exact of shall and gas; Belt one at are (6) in (7) In (8) 2 a 'Tc(O} 0.96 Results 0.32 0.05 'Tc(O} Results 0.55 1.90 for (distance implies PT(O) ing Belt system the MT (i.e., value (1964, estimated which Sect. sions. Table formation. Using plane density integrating Tc({:J) SF According by Similarly, Let an = BO-B5 are values 2H give = III is the = The 7TR the effective p. {:J of is na(O) H la) 0.54 0.71 (cm- depends 0.47 na(O) (cm- those 2.1 0.23 1.2 intermediate is will .,. measure less (Table 267) 2 the c(O) ~ (jzj) by values the NASA gas J and given along 3 stars 3 31.7 the Me ) PT(z)dz ) be to Davies of tanh than Belt effective and to Iisin radius X = points a total proportional SF, pe-s. la) only pc. Ma of total 0.42 0.56 (10 0.37 Ma (1()3 4.0 the 5.3 above, disk, a 22 of 2 as Astrophys~cs (~tan 200 · the 6 line we 10 With (1960), the = {:J pc between Me) latitude hydrogen Me) seen well R mass slightly thickness 5 750-1000 toward 27TR pc) average density find Me from = of overall yields {:J) uv from p.,.(O) (Mepc- 0.23 0.23 0.23 400 2 which p.,.(O) (Me 0.37 0.22 determined ratio sight who HpT(O) (Allen, MH = to the with the on a pc, mass 2.5 pc- of MT dimensions the assumed pc PT(z) ~ MHfMT gives high plane 10 3 according the the Data ) 3 the respect km 5 in ) 1973, 8 = Sun. M.,. is (10 7.3 7.3 7.3 M.,. (1()3 10 29 37 Me diameter. layer) given total s-1, 7.3 efficiency the nH(O) assumed 5 6 of space Me) Me, ~ System Me) smaller p. cited The 10 to Gould's optical Eq. 0.07, mass 282). which, of obtained 6 by to the twice Me. Ma/M.,. hydrogen 0.06 0.08 0.05 MafM.,. by 0.14 0.14 position (7) Gould's Assum­ Eq. Eq. T. a dimen­ of central of Allen depth gives value with Belt This that (10) (see star the (11) (6); (8) (9) in 1979A&A....71..319S F. temperature To that which Tc(fi) we where sin calculated meters parameter and ascending i, the parameters little up certainty Eq. X/H, X/ this V. tion, A effective cloud in possibly section. (corresponding of appearance the motion single a, velocities. and is 60 hydrogen 120 The M. While H fJ the large, somewhat fJ = use K. convert Fig. The to lower OB (1) intersects K, whole ~ case the mostly = would Strauss = as to I association, cloud lies Using © shape in i 20% the discussed b- km should Lupus sin stars of T.{1 while, seen We 3 is as results elongated blending of a, European radius limits). turn node Camm's in density for with Thus, the relation extending s-1, (b the fJ and far range b the et in is may = be in assume the - in of 0 Eq. in into wider, • the - which al.: Hydrogen many rather the 2.5 this as require serves as exp Eq. needed of inclination the optical to the the of Fig. the results area b have the (3) above, The A Structure central 0 at b the D I km Lupus before, a )[cos of Table with (11). region, model hydrogen [- curves preceding = = ratio along value total that for clouds z the upper = presumably flat, fit 4a of at smaller Belt. Southern s - to allowed 40 320°, = Tc{fi)]}. data a to 2 are 170 to NH(O) If the for observations 1 Concentration least i section correction, 0 the 1a. plane cloudlets pc shows calculate subtended would we maintain that a the we was + of the of as although limit Because and collected that pc of three near Scorpius-Centaurus cut Gould's gas sin in Fig. internal have concentration data discussed equations (Blaauw, values we adopt from SF, Bertiau typical of spin 2 make at ly ofT. (Bertiau, the still cloud three b i due can calculate Observatory the values 4a sin the and is applied constant longitude = the of at the the angle Belt a good in I= ofTc temperatures. depends plane the 2 motions. only be Belt given to up 10°. the small similar (1 for longitude would slightly is (1958) curves 1964), Table peak fit. hydrogen in 0 using ofT. within 330°-350°, self Gould's at lower 1958). for - at of obtained specify Optically tentatively the A the by of can the ly)]l' latitude 27°). practically absorption brightness and affect mostly change 1a. change found the We (the Eq. the turbulent of the previous value different Since distance limit associa­ the be 2 of profile Belt, has upper adopt para­ • Tc(b) mean (5) only with very seen (12) (13) The Belt (14) this un­ the but Provided b for on of an its of in 1 to 0 of is 0 a , The parameter. 'T Since the I If addition are blending, peak data self density total The MH last values about 10 Numerical section. advanced continuing. the increase VI. explains dimensional about of crossed other cloud Lindblad with upper Strauss collapse, c(fi) = Figure T. Adjusting The Strauss pc the hydrogen visible. 340° sound equivalent = Dynamics column density of = = absorption; mass the for by for H direction. twice may 5 total ofT. disk, 27TA limit _ Fig. nH(O), 60 2 the H and 10 to This ; the in observations. is H the and a 4b "(1974) while which in and c(~) K, 7 speed, is 2 results smfJ reasonable the The have HmHnH(O). shock 4b, the not gas hydrogen = yr the PT(O) Eq. (Landau the present shows given Poeppel shows this extension then obtained compression NASA Astrophysics may 343°, of 13 ago, of Poeppel main gas we the gas The pressure known [tanh low average (12) suggested been the eventually thus pc Eq. can are section associated nH(O) 'Tc(O) by obtain to that indicate from higher being Tc(b) shape. the if expansion Layer peak, latitude with summarized and (11) mass (1976) be total giving fit. in ( from T. seen D (1976) = in = with densest value obtained a a led of an = averaged confined ; is Tc{fi) Lifshitz, 1.9 latitude that several gas 2.1 mass We this is state led Eq. at that brought now 120 with acceptable the pointed a A to one either which atoms I"' have cloud few obtained velocity may tan given Gould's case, to (14), expansion K; ratio of part Belt, star in the could from minor fJ) 337°. km by feature 1959) rotation from a the add Table one also causes cm- that is out by the Carina it is Data of self-gravity formation and flat s - 1.2 has fit Eq. MH/ mean Belt in that remains be of Eq. concentrations stated 1 3 of the collapsed that data resulting to , 1 atoms in is considerable the in may a b, disk, an the (7), M three System prior (15) and spiral the the originated, theoretical caused agreement cloud. where hydrogen T the this effect previous between extreme that and ~ central still sudden a cm- is to which in to plane times H 14%, arm. (15) as one­ free (16) (17) disk 323 less the the the the the by In of be its = 3 it • ..... _, ~ ... -· ' . 1979A&A....71..319S from that plane, a must positions, plane P/4 324 in the as reported increasing. they motion are oscillating would inclined its inclined "'18°. ical may formation. for extended that moving gaseous plane present a gas that works lagging stellar possible (1974) Vll. the spiral Considering 5 by plane systematic hole However, 10 a It A The 5 currently the the large maximum rotation, "' (cf. 7 there northern following 10 the theory still remains infer further have Discussion its move yr to © Since of then at arm 2 in 7 of and collapse passage is compression magnetic together behind structures Sect. yr, work ago, 10 Belt with the by initial be existence and European its to the P least and Lilley velocities is about that 7 been collapsed oscillate away others rotating. include "' Lesh evidence yr in Frogel this present disk of the near proper a stars local support this II), to in stellar respect hemisphere large 8 but or picture once. inclination the agreement of they of position, (1955) and the Nelson 10 information with the formed is be with from corresponds {1968). which 3Pf4 the are field, the may may distribution the 7 of not was stars. and the perpendicular clump sense rigidly yr. position, explained galactic Conclusions motion into In into were (reviewed predicted apices Evidence the layers Southern for a a spiral to initial the and "' have an of be Their shocks velocity fact, Stothers established helical is which {1976a,b) They in stars, the that a a perpendicular 6 the related plane; of equilibrium Gould's formed in with OB with self-gravitating every Davies disk 10 of a shock plane; a Lesh comes p. gas gas now the data galactic that 7 the to rotation slightly sheet that their of suggest why "' in by after stars yr for component of period according the ( slightly led complex (1977) the right from ~ stars, Observatory inclination 0~02 {1968, available, with Grape, ago. a P/2 indicate to has wave. in {1960). would the 10 which a Belt. few vertical the by crossing not that initial to linear below the 7 the similar larger plane. yr- that "' sense position P, an her Instead, period Gould's hypothesis M dust expansion the km did p. over Belt to only 4 0 Approximately 1975, reaching was leading galactic galactic be 1 inclination ) hydrodynam­ data We 381) that disk • needs 10 the to and s of motion, the we in the not early and Interpreted tilt if is - the responsible t 7 This gas tilt for the 1 originally currently from the yr. point the of • are p. Lindblad stars the the the remarks triggered we Belt. confirm galactic galactic than The present galactic gas to such a Carina 81) is of to • 21 plane plane in again is gas led sheet inter­ infer Such stars stars turn disk and star still disk and Provided are out the the the the em for the of be to a is further is present parallel fluenced high the of nova {1972) Hughes is Rickard shock and present (T,, constrained obtained (Fig. reliable not seems 1a; of self-gravity distortion present hemisphere between are in Brazilian Computations de References member Nacional Ackrwwledgements. Allen, Blaauw,A.: Bertiau,F.C.: Blaauw, Allen,C.W.: Clube,S. Camm,G.L.: Davies,R.D.: currently Previous The The 750-1000 Future Press, Press, advance Weaver's the Dados grateful Perseus a,, the strongly the efficiency 4a) explosion, by C. that as physical parameters to effect Tc(O)). the into interpretation A.: unless of W.: and to London London input by V. (1968) analysis institutions the is de due expansion the from da the be of research M.: to (cf. disk quite compressed the ideas that 1964, 1952, Investigaciones either is smaller arm 21 by pc. rotation 1964, Routledge Universidade 1973, publication. 1950, {1974) C. to 1958, dependent 1960, of were Carrera very NASA Astrophysics the Carom's 1967, parameters large Fig. Considering em ("' optical situation. is the A. the to following the good Bull. Ann. of which on still This should dominating Monthly Olano Astrophysical rotating performed 90%) Astrophys. Astrophysical of Monthly understand data. small, CNPq spiral observations Monthly the is 2 energy clumps, rest energy collision the del and the Astron. Rev. expanding, is and of necessary work model data, the (1972) were based lnvestigador spiral for and on origin Federal model of SF). shock and Cientificas oscillation Astron. be the since Notices Notices are a requirement or gas. granting Notices J. lnst. its the at was is and that similar and later are is FINEP. extended numerical on force. 128, of oscillating This the arm. the postulated peculiar supplied value, of Quantities, not Quantities, waves. are Galaxy there do Neth. Astrophys. partially and the in stars with the Roy. two still Roy. Centro Roy. 533 only Gould's explained dimensions us y Cientifico a Rio summarized favors order hypothesis The density hypotheses; good Tecnicas W. hydrogen that permission 11, the a Astron. being Astron. is were Data gas Another Astron. Grande of current to gas results on T. G. by 414 supported around de no gas a the fit 2, 2d. 3d. the representation to our streams. Belt L. the Gould's formed super-super­ is Processamento wave of velocities 213 the formed. evidence of to System Soc. by Soc. expansion. Soc. condensed distinguish ed. Poeppel ed. results .... the do (H, should not view to diameter Argentina. line· made proposal were northern the in Roberts galactic an and theory, 110, 120, Sui. Athlone use 137, Consejo Athlone :. by Table X, '·- with fully data data axis that The Belt data are in­ the is At We by 305 483 189 R) the be in of a 1979A&A....71..319S F. Grape,K.: Frogel,J.A., Landau,L.D., Hughes, Lilley, Lesh,J.R.: Lindblad,P.O.: Nelson,A.H.: Lindblad, Lindblad,P.O., stellar Press, Astron. M. Strauss A.B.: © V.A., London, Hydrogen P.O.: Astrophys. European 1975, 1968, Stothers,R.: 1955, et Routledge, Lifshitz,E.M.: 1976a, 1974, 1967, al.: Grape~K., A Astrophys. p. Astrophys. Gas, Model 357 Structure 24, Monthly Proc. Bull. 309 Ph.D. Southern D.: 1977, for Astron. First J. Sandquist,Aa., J. 1972, 1959, Notices of Suppl. a Thesis, Astron. 121, European Local Gould's lnst. Astron. Fluid 559 17, Roy. Observatory Component University J. Neth. 371 Belt 82, Mechanics, Astron. J. Astron. 890 Schober,J.: 77, 19, 210 34 of Meeting Soc. of Stockholm Pergamon the 174, • Inter­ 1973, 2, Provided 661 65 Nelson, Olano, Poeppel, Poeppel,W.G.L., Stothers,R., Takakubo,K., Roberts,W.W.: Rickard,J.J.: Strauss,F.M., Weaver, publication) Hydrogen, 18,488 by C. A. H.: W.G.L., A., H.: the 1974, Frogel,J.A.: Poeppel, Carnegie 1968, 1976b, Poeppel, van NASA Astrophysics 1972, Vieira,E.R.: Highlights Vieira,E.R.: Woerden,H.: Astrophys. Monthly W.G.L., Astrophys.J.113, Inst. W.: 1974, 1976, of of Notices Washington J. Vieira,E.R.: 1977 Astronomy Astron. 152, 1974, '1966, Astrophys. (submitted 1019 Roy. J. Bull. An 259 79, 3, Publ. Astron. Data 1977. J. Atlas Astron. 423 456 204, for No. (submitted Soc.111, System of 94 publication) '• /nst. 633 .: Galactic ' Neth. 265 325 for