Revista Mexicana de Astronomía y Astrofísica ISSN: 0185-1101 [email protected] Instituto de Astronomía México

Duffau, S. V.; Zinn, Robert; Vivas, A. K.; Méndez, R. A.; Carraro, G.; Winnick, R.; Gallart, C. Confirmation of halo substructure using quest data: the new stellar stream (VSS) Revista Mexicana de Astronomía y Astrofísica, vol. 26, agosto, 2006, pp. 70-71 Instituto de Astronomía Distrito Federal, México

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Leopoldo Infante, Monica Rubio & Silvia Torres-Peimbert VSS p tic tion tin p exten that Fig. branc deg ric dSph nosit in if halo the ter. ears oin the Fig. ue Halo The 2 database Virgo 1. ts. substructure, y Evidence of mem VSS of t h galaxy to to stellar function The and and 1, a the new where Our gather b Stellar dw b whic is e ers QUEST its the sky y arf not Virgo p for or et radial in h opulation the kinematic for main-sequence at in another to galaxy more Stream is evidence related order the QUEST suc a w the the Stellar RRLs sc e v elo h examined sp hematic magnitude to globular b and an ectroscopic cit example to is y and (small determine of Stream the y RRLs upturn as the other an measuremen metallicit old are diagram THE Milky stream p the cluster upturn oin are prominen where of as exp (VSS) w SDSS ts) b of the data as NEW a plotted etter W ected globular Virgo. are y from found of P a the in cannibaliza- y al signatures. is ts of photomet- the . t plotted its the VIR features 5. to subgian depicted W indicate p as the spatial ossible Galac- in e merge It small lumi- GO clus- con- 106 Sgr ap- in t STELLAR are a sc indicated. hematic Viv Viv Viv Sirk Newb and F Duffau, Viv for and The is ac undaci´ kno partially as, as, as, as, stars 74, This the o, gran Univ STREAM F diagram erg, wledge E., OND A. A. A. A. 928 preparation S., on in ts: reasearc K. K. K., ersidad et H. K. et the AP & Andes al. NSF and J., funded PhD et al. funding of Zinn, Halo 2004, al. et (VSS) 15010003. the 2006, 35 h de AST al. Thesis REFERENCES 2004, is R. C-13798, other Milky of of Chile AJ, b 2002, part y from 2003, ApJ the 00-98428, Fig. AJ, the 127, 2002 authors W Milky and of Letters, ApJ, W Mem. the 1. a 127, F y’s a 899 e MECESUP undaci´ “A Y join thank follo 569, ale W halo. 1158 NSF 2001, So surv a 636, t y” Univ c. wing 245 pro on Astron. The ey AST Gio ApJ, L97 ject ersit Andes. of institutions v p UCH-118, anni 05-07364, ositions RR 554, b y Italiana, , et whic Lyrae w Zinn L33 een W 71 of h e