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Arxiv:1911.09125V2 [Astro-Ph.SR] 23 Jun 2020 Maccarone Et Al
Draft version June 25, 2020 Typeset using LATEX twocolumn style in AASTeX63 A Dynamical Survey of Stellar-Mass Black Holes in 50 Milky Way Globular Clusters Newlin C. Weatherford,1, 2 Sourav Chatterjee,3 Kyle Kremer,1, 2 Frederic A. Rasio,1, 2 1Department of Physics & Astronomy, Northwestern University, Evanston, IL 60208, USA 2Center for Interdisciplinary Exploration & Research in Astrophysics (CIERA), Northwestern University, Evanston, IL 60208, USA 3Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400005, India ABSTRACT Recent numerical simulations of globular clusters (GCs) have shown that stellar-mass black holes (BHs) play a fundamental role in driving cluster evolution and shaping their present-day structure. Rapidly mass-segregating to the center of GCs, BHs act as a dynamical energy source via repeated super-elastic scattering, delaying onset of core collapse and limiting mass segregation for visible stars. While recent discoveries of BH candidates in Galactic and extragalactic GCs have further piqued inter- est in BH-mediated cluster dynamics, numerical models show that even if significant BH populations remain in today's GCs, they are not typically in directly detectable configurations. We demonstrated in Weatherford et al.(2018) that an anti-correlation between a suitable measure of mass segregation (∆) in observable stellar populations and the number of retained BHs in GC models can be applied to indirectly probe BH populations in real GCs. Here, we estimate the number and total mass of BHs in 50 Milky Way GCs from the ACS Globular Cluster Survey. For each GC, ∆ is measured between observed main sequence populations and fed into correlations between ∆ and BH retention found in our CMC Cluster Catalog's models. -
Optical Astronomy Observatories
NATIONAL OPTICAL ASTRONOMY OBSERVATORIES NATIONAL OPTICAL ASTRONOMY OBSERVATORIES FY 1994 PROVISIONAL PROGRAM PLAN June 25, 1993 TABLE OF CONTENTS I. INTRODUCTION AND PLAN OVERVIEW 1 II. SCIENTIFIC PROGRAM 3 A. Cerro Tololo Inter-American Observatory 3 B. Kitt Peak National Observatory 9 C. National Solar Observatory 16 III. US Gemini Project Office 22 IV. MAJOR PROJECTS 23 A. Global Oscillation Network Group (GONG) 23 B. 3.5-m Mirror Project 25 C. WIYN 26 D. SOAR 27 E. Other Telescopes at CTIO 28 V. INSTRUMENTATION 29 A. Cerro Tololo Inter-American Observatory 29 B. Kitt Peak National Observatory 31 1. KPNO O/UV 31 2. KPNO Infrared 34 C. National Solar Observatory 38 1. Sacramento Peak 38 2. Kitt Peak 40 D. Central Computer Services 44 VI. TELESCOPE OPERATIONS AND USER SUPPORT 45 A. Cerro Tololo Inter-American Observatory 45 B. Kitt Peak National Observatory 45 C. National Solar Observatory 46 VII. OPERATIONS AND FACILITIES MAINTENANCE 46 A. Cerro Tololo 47 B. Kitt Peak 48 C. NSO/Sacramento Peak 48 D. NOAO Tucson Headquarters 49 VIII. SCIENTIFIC STAFF AND SUPPORT 50 A. CTIO 50 B. KPNO 50 C. NSO 51 IX. PROGRAM SUPPORT 51 A. NOAO Director's Office 51 B. Central Administrative Services 52 C. Central Computer Services 52 D. Central Facilities Operations 53 E. Engineering and Technical Services 53 F. Publications and Information Resources 53 X. RESEARCH EXPERIENCES FOR UNDERGRADUATES PROGRAM 54 XI. BUDGET 55 A. Cerro Tololo Inter-American Observatory 56 B. Kitt Peak National Observatory 56 C. National Solar Observatory 57 D. Global Oscillation Network Group 58 E. -
Mining SDSS in Search of Multiple Populations in Globular Clusters
A&A 525, A114 (2011) Astronomy DOI: 10.1051/0004-6361/201015662 & c ESO 2010 Astrophysics Mining SDSS in search of multiple populations in globular clusters C. Lardo1, M. Bellazzini2, E. Pancino2, E. Carretta2, A. Bragaglia2, and E. Dalessandro1 1 Department of Astronomy, University of Bologna, via Ranzani 1, 40127 Bologna, Italy e-mail: [email protected] 2 INAF - Osservatorio Astronomico di Bologna, via Ranzani 1, 40127 Bologna, Italy Received 31 August 2010 / Accepted 6 October 2010 ABSTRACT Several recent studies have reported the detection of an anomalous color spread along the red giant branch (RGB) of some globular clusters (GC) that appears only when color indices including a near ultraviolet band (such as Johnson U or Strömgren u) are con- sidered. This anomalous spread in color indexes such as U − B or cy has been shown to correlate with variations in the abundances of light elements such as C, N, O, Na, etc., which, in turn, are generally believed to be associated with subsequent star formation episodes that occurred in the earliest few 108 yr of the cluster’s life. Here we use publicly available u, g, r Sloan Digital Sky Survey photometry to search for anomalous u − g spreads in the RGBs of nine Galactic GCs. In seven of them (M 2, M 3, M 5, M 13, M 15, M 92 and M 53), we find evidence of a statistically significant spread in the u − g color, not seen in g − r and not accounted for by observational effects. In the case of M 5, we demonstrate that the observed u − g color spread correlates with the observed abundances of Na, the redder stars being richer in Na than the bluer ones. -
II. Relative Ages and Distances for Six Ancient Globular Clusters
Mon. Not. R. Astron. Soc. 000, 1{?? (2002) Printed 7 April 2018 (MN LATEX style file v2.2) Exploring the nature and synchronicity of early cluster formation in the Large Magellanic Cloud: II. Relative ages and distances for six ancient globular clusters R. Wagner-Kaiser1, Dougal Mackey2, Ata Sarajedini1;3, Brian Chaboyer4, Roger E. Cohen5, Soung-Chul Yang6, Jeffrey D. Cummings7, Doug Geisler8, Aaron J. Grocholski9 1University of Florida, Department of Astronomy, 211 Bryant Space Science Center, Gainesville, FL, 32611 USA 2Australian National University, Research School of Astronomy & Astrophysics, Canberra, ACT 2611, Australia 3Florida Atlantic University, Department of Physics, 777 Glades Rd, Boca Raton, FL, 33431 USA 4Dartmouth College, Department of Physics and Astronomy, Hanover, NH, 03755, USA 5Space Telescope Science Institute, Baltimore, MD 21218, USA 6Korea Astronomy and Space Science Institute (KASI), Daejeon 305-348, Korea 7Center for Astrophysical Sciences, Johns Hopkins University, Baltimore MD 21218 8Departamento de Astronomia, Universidad de Concepcion, Casilla 160-C, Concepcion, Chile 9Department of Physics and Astronomy, Swarthmore College, Swarthmore, PA 19081, USA ABSTRACT We analyze Hubble Space Telescope observations of six globular clusters in the Large Magellanic Cloud from program GO-14164 in Cycle 23. These are the deepest available observations of the LMC globular cluster population; their uniformity facilitates a precise comparison with globular clusters in the Milky Way. Measuring the magnitude of the main sequence turnoff point relative to template Galactic globular clusters allows the relative ages of the clusters to be determined with a mean precision of 8.4%, and down to 6% for individual objects. We find that the mean age of our LMC cluster ensemble is identical to the mean age of the oldest metal-poor clusters in the Milky Way halo to 0.2 ± 0.4 Gyr. -
SPIRIT Target Lists
JANUARY and FEBRUARY deep sky objects JANUARY FEBRUARY OBJECT RA (2000) DECL (2000) OBJECT RA (2000) DECL (2000) Category 1 (west of meridian) Category 1 (west of meridian) NGC 1532 04h 12m 04s -32° 52' 23" NGC 1792 05h 05m 14s -37° 58' 47" NGC 1566 04h 20m 00s -54° 56' 18" NGC 1532 04h 12m 04s -32° 52' 23" NGC 1546 04h 14m 37s -56° 03' 37" NGC 1672 04h 45m 43s -59° 14' 52" NGC 1313 03h 18m 16s -66° 29' 43" NGC 1313 03h 18m 15s -66° 29' 51" NGC 1365 03h 33m 37s -36° 08' 27" NGC 1566 04h 20m 01s -54° 56' 14" NGC 1097 02h 46m 19s -30° 16' 32" NGC 1546 04h 14m 37s -56° 03' 37" NGC 1232 03h 09m 45s -20° 34' 45" NGC 1433 03h 42m 01s -47° 13' 19" NGC 1068 02h 42m 40s -00° 00' 48" NGC 1792 05h 05m 14s -37° 58' 47" NGC 300 00h 54m 54s -37° 40' 57" NGC 2217 06h 21m 40s -27° 14' 03" Category 1 (east of meridian) Category 1 (east of meridian) NGC 1637 04h 41m 28s -02° 51' 28" NGC 2442 07h 36m 24s -69° 31' 50" NGC 1808 05h 07m 42s -37° 30' 48" NGC 2280 06h 44m 49s -27° 38' 20" NGC 1792 05h 05m 14s -37° 58' 47" NGC 2292 06h 47m 39s -26° 44' 47" NGC 1617 04h 31m 40s -54° 36' 07" NGC 2325 07h 02m 40s -28° 41' 52" NGC 1672 04h 45m 43s -59° 14' 52" NGC 3059 09h 50m 08s -73° 55' 17" NGC 1964 05h 33m 22s -21° 56' 43" NGC 2559 08h 17m 06s -27° 27' 25" NGC 2196 06h 12m 10s -21° 48' 22" NGC 2566 08h 18m 46s -25° 30' 02" NGC 2217 06h 21m 40s -27° 14' 03" NGC 2613 08h 33m 23s -22° 58' 22" NGC 2442 07h 36m 20s -69° 31' 29" Category 2 Category 2 M 42 05h 35m 17s -05° 23' 25" M 42 05h 35m 17s -05° 23' 25" NGC 2070 05h 38m 38s -69° 05' 39" NGC 2070 05h 38m 38s -69° -
Caldwell Catalogue - Wikipedia, the Free Encyclopedia
Caldwell catalogue - Wikipedia, the free encyclopedia Log in / create account Article Discussion Read Edit View history Caldwell catalogue From Wikipedia, the free encyclopedia Main page Contents The Caldwell Catalogue is an astronomical catalog of 109 bright star clusters, nebulae, and galaxies for observation by amateur astronomers. The list was compiled Featured content by Sir Patrick Caldwell-Moore, better known as Patrick Moore, as a complement to the Messier Catalogue. Current events The Messier Catalogue is used frequently by amateur astronomers as a list of interesting deep-sky objects for observations, but Moore noted that the list did not include Random article many of the sky's brightest deep-sky objects, including the Hyades, the Double Cluster (NGC 869 and NGC 884), and NGC 253. Moreover, Moore observed that the Donate to Wikipedia Messier Catalogue, which was compiled based on observations in the Northern Hemisphere, excluded bright deep-sky objects visible in the Southern Hemisphere such [1][2] Interaction as Omega Centauri, Centaurus A, the Jewel Box, and 47 Tucanae. He quickly compiled a list of 109 objects (to match the number of objects in the Messier [3] Help Catalogue) and published it in Sky & Telescope in December 1995. About Wikipedia Since its publication, the catalogue has grown in popularity and usage within the amateur astronomical community. Small compilation errors in the original 1995 version Community portal of the list have since been corrected. Unusually, Moore used one of his surnames to name the list, and the catalogue adopts "C" numbers to rename objects with more Recent changes common designations.[4] Contact Wikipedia As stated above, the list was compiled from objects already identified by professional astronomers and commonly observed by amateur astronomers. -
Properties of Stellar Generations in Globular Clusters and Relations With
Astronomy & Astrophysics manuscript no. carretta c ESO 2018 November 9, 2018 Properties of stellar generations in Globular Clusters and relations with global parameters ⋆ E. Carretta1, A. Bragaglia1, R.G. Gratton2, A. Recio-Blanco3, S. Lucatello2,4, V. D’Orazi2, and S. Cassisi5 1 INAF-Osservatorio Astronomico di Bologna, via Ranzani 1, I-40127 Bologna, Italy 2 INAF-Osservatorio Astronomico di Padova, vicolo dell’Osservatorio 5, I-35122 Padova, Italy 3 Laboratoire Cassiop´ee UMR 6202, Universit`ede Nice Sophia-Antipolis, CNRS, Observatoire de la Cote d’Azur, BP 4229, 06304 Nice Cedex 4, France 4 Excellence Cluster Universe, Technische Universit¨at M¨unchen, Boltzmannstr. 2, D-85748, Garching, Germany 5 INAF-Osservatorio Astronomico di Collurania, via M. Maggini, I-64100 Teramo, Italy Received .....; accepted ..... ABSTRACT We revise the scenario of the formation of Galactic globular clusters (GCs) by adding the observed detailed chemical composition of their different stellar generations to the set of their global parameters. We exploit the unprecedented set of homogeneous abundances of more than 1200 red giants in 19 clusters, as well as additional data from literature, to give a new definition of bona fide globular clusters, as the stellar aggregates showing the presence of the Na-O anticorrelation. We propose a classification of GCs according to their kinematics and location in the Galaxy in three populations: disk/bulge, inner halo, and outer halo. We find that the luminosity function of globular clusters is fairly independent of their population, suggesting that it is imprinted by the formation mechanism, and only marginally affected by the ensuing evolution. We show that a large fraction of the primordial population should have been lost by the proto-GCs. -
The Astrophysical Journal Supplement Series, 45:259-334
.259W The Astrophysical Journal Supplement Series, 45:259-334, 1981 February 45. © 1981. The American Astronomical Society. All rights reserved. Printed in U.S.A. ... 198lApJS A CATALOG OF RADIAL VELOCITIES IN GALACTIC GLOBULAR CLUSTERS1 R. F. Webbink Department of Astronomy, University of Illinois at Urbana-Champaign Received 1980 February 25; accepted 1980 July 9 ABSTRACT A catalog of all stellar and integrated radial velocities of galactic globular clusters published prior to 1980 is assembled here. Known systematic errors in the data are discussed, and data on 686 stars and 85 globular clusters are presented in the body of the catalog; an Appendix lists published radial velocities in 4 dwarf spheroidal satellites of the Galaxy. Weighted mean velocities for each of the 89 systems in the catalog and Appendix are calculated. Subject headings: clusters: globular— stars: catalogs I. INTRODUCTION data. No catalog of individual stellar and cluster veloci- Radial velocities of galactic globular clusters were ties exists as such. first obtained in the pioneering surveys by Slipher (1918, The present catalog is intended to fill the need for a 1919, 1922, 1924), at Lowell Observatory, and by San- comprehensive listing of all available globular cluster ford (1918, 1919a,6), at Mount Wilson, who together radial velocity data and to provide a systematic reassess- obtained velocities of 18 clusters. In the more than 60 ment of the cluster velocities on this basis. To the best of years since those studies, several other radial velocity the author’s knowledge, all data published prior to 1980 surveys have been published, of which the most exten- January 1 are included here. -
Optical Astronomy Observatories
National Optical Astronomy Observatories National Optical Astronomy Observatories Quarterly Report July - September 1989 TABLE OF CONTENTS I. INTRODUCTION j II. SCIENTIFIC HIGHLIGHTS 2 A. Ages of Globular Ousters 2 B. Disk Galaxies in Formation 2 C. Differential Rotation Observed in the Sun as a Star 3 D. Intensity Oscillations in the Far-Infrared 4 E. Supergranular Convection 4 F. Brown Dwarfs: A Detection of Stellar Objects of Subcritical Mass? 5 G. Cooling Flows in Clusters of Galaxies: Where Are All the Stars? 5 III. PERSONNEL 7 A. Visiting Scientists 7 B. New Appointees 7 C. Terminations 7 D. Change of Status ' g E. Summer Research Assistants 8 IV. INSTRUMENTATION, NEW PROJECTS, AND OBSERVATORY ACTIVITIES .... 9 A. Future Telescope Technology Program (FTT) 9 B. Global Oscillation Network Group (GONG) 9 C. Instrumentation Projects ]\ D. Observatory Activities 16 V. PROGRAM SUPPORT !9 A. Director's Office 19 B. Central Administrative Services 20 C. Central Computer Services 20 D. Central Facilities Operations 20 E. Engineering and Technical Services 21 F. Publications and Information Resources 21 Appendices Appendix A: Telescope Usage Statistics Appendix B: Observational Programs I. INTRODUCTION This quarterly report covers scientific highlights for the period of July - September 1989, as well as personnel changes for the period. These highlights emphasize concluded projects rather than work in progress. The report also discusses new technology for telescopes and instrumentation, GONG, instrumentation projects, and observatory activities. The Engineering and Technical Services division now submits reports for the instrumentation projects, with contributions from program scientists, if necessary. The Associate Directors for CTIO and NSO continue to provide the information of efforts at La Serena/Cerro Tololo and Sacramento Peak. -
108 Afocal Procedure, 105 Age of Globular Clusters, 25, 28–29 O
Index Index Achromats, 70, 73, 79 Apochromats (APO), 70, Averted vision Adhafera, 44 73, 79 technique, 96, 98, Adobe Photoshop Aquarius, 43, 99 112 (software), 108 Aquila, 10, 36, 45, 65 Afocal procedure, 105 Arches cluster, 23 B1620-26, 37 Age Archinal, Brent, 63, 64, Barkhatova (Bar) of globular clusters, 89, 195 catalogue, 196 25, 28–29 Arcturus, 43 Barlow lens, 78–79, 110 of open clusters, Aricebo radio telescope, Barnard’s Galaxy, 49 15–16 33 Basel (Bas) catalogue, 196 of star complexes, 41 Aries, 45 Bayer classification of stellar associations, Arp 2, 51 system, 93 39, 41–42 Arp catalogue, 197 Be16, 63 of the universe, 28 Arp-Madore (AM)-1, 33 Beehive Cluster, 13, 60, Aldebaran, 43 Arp-Madore (AM)-2, 148 Alessi, 22, 61 48, 65 Bergeron 1, 22 Alessi catalogue, 196 Arp-Madore (AM) Bergeron, J., 22 Algenubi, 44 catalogue, 197 Berkeley 11, 124f, 125 Algieba, 44 Asterisms, 43–45, Berkeley 17, 15 Algol (Demon Star), 65, 94 Berkeley 19, 130 21 Astronomy (magazine), Berkeley 29, 18 Alnilam, 5–6 89 Berkeley 42, 171–173 Alnitak, 5–6 Astronomy Now Berkeley (Be) catalogue, Alpha Centauri, 25 (magazine), 89 196 Alpha Orionis, 93 Astrophotography, 94, Beta Pictoris, 42 Alpha Persei, 40 101, 102–103 Beta Piscium, 44 Altair, 44 Astroplanner (software), Betelgeuse, 93 Alterf, 44 90 Big Bang, 5, 29 Altitude-Azimuth Astro-Snap (software), Big Dipper, 19, 43 (Alt-Az) mount, 107 Binary millisecond 75–76 AstroStack (software), pulsars, 30 Andromeda Galaxy, 36, 108 Binary stars, 8, 52 39, 41, 48, 52, 61 AstroVideo (software), in globular clusters, ANR 1947 -
The Caldwell Catalogue+Photos
The Caldwell Catalogue was compiled in 1995 by Sir Patrick Moore. He has said he started it for fun because he had some spare time after finishing writing up his latest observations of Mars. He looked at some nebulae, including the ones Charles Messier had not listed in his catalogue. Messier was only interested in listing those objects which he thought could be confused for the comets, he also only listed objects viewable from where he observed from in the Northern hemisphere. Moore's catalogue extends into the Southern hemisphere. Having completed it in a few hours, he sent it off to the Sky & Telescope magazine thinking it would amuse them. They published it in December 1995. Since then, the list has grown in popularity and use throughout the amateur astronomy community. Obviously Moore couldn't use 'M' as a prefix for the objects, so seeing as his surname is actually Caldwell-Moore he used C, and thus also known as the Caldwell catalogue. http://www.12dstring.me.uk/caldwelllistform.php Caldwell NGC Type Distance Apparent Picture Number Number Magnitude C1 NGC 188 Open Cluster 4.8 kly +8.1 C2 NGC 40 Planetary Nebula 3.5 kly +11.4 C3 NGC 4236 Galaxy 7000 kly +9.7 C4 NGC 7023 Open Cluster 1.4 kly +7.0 C5 NGC 0 Galaxy 13000 kly +9.2 C6 NGC 6543 Planetary Nebula 3 kly +8.1 C7 NGC 2403 Galaxy 14000 kly +8.4 C8 NGC 559 Open Cluster 3.7 kly +9.5 C9 NGC 0 Nebula 2.8 kly +0.0 C10 NGC 663 Open Cluster 7.2 kly +7.1 C11 NGC 7635 Nebula 7.1 kly +11.0 C12 NGC 6946 Galaxy 18000 kly +8.9 C13 NGC 457 Open Cluster 9 kly +6.4 C14 NGC 869 Open Cluster -
1.4 the Magellanic Clouds
The copyright of this thesis vests in the author. No quotation from it or information derived from it is to be published without full acknowledgementTown of the source. The thesis is to be used for private study or non- commercial research purposes only. Cape Published by the University ofof Cape Town (UCT) in terms of the non-exclusive license granted to UCT by the author. University THE STRUCTURE OF THE LARGE MAGELLANIC CLOUD By Oyirwoth Patrick Abedigamba Town A dissertation submitted in partial fulfillmentCape of the requirements for the degree M.Sc. in the Departmentof of Astronomy, as part of the National Astrophysics and Space Science Programme UNIVERSITY OF CAPE TOWN AUGUST 2010 University Supervisors: Honorary. Prof. Michael Feast1,2 Prof. Patricia Whitelock2,1 1Astronomy Department, University of Cape Town 2South African Astronomical Observatory Key words Large Magellanic Cloud, RR Lyrae stars, Optical Gravitational Lensing Experiment, Fourier parameters, metallicity [Fe/H]. Town Cape of University i Abstract This work gives an account of the study of the metallicity [Fe/H] distribution (gradient) in the oldest population in the Large Magellanic Cloud (LMC), by making use of the available RR Lyrae data from the Optical Gravitational Lensing Experiment III (OGLE III). RR Lyrae stars are amongst the oldest objects in the universe and they have a range in element (metal) abundances. Measuring the distribution of metallicities of RR Lyrae stars in a galaxy gives one clues to the origin of galaxies. It is known that the pulsation periods of RR Lyraes is broadly correlated with their metallicity. This fact has been used for investigating the metallicity distribution of RR Lyrae stars in the LMC.