Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...458l..13m&link_type=abstract
Astrophysical Journal Letters v.458, p.L13
Astronomy and Astrophysics
Astronomy
61
Galaxies: Individual Name: Sagittarius, Galaxy: Halo, Galaxies: Local Group
Scientific paper
We report the discovery of stars associated with the Sagittarius dwarf spheroidal galaxy (Sgr) located nearly 10 deg from the center of the main body of the galaxy, far beyond the outer boundary defined by the star counts of Ibata and coworkers. The newly discovered stars in Sgr include three RR Lyrae stars found serendipitously behind the Galactic globular cluster M55, red horizontal branch stars, and main-sequence stars identified both in the M55 field and in another field located away from this cluster but still about 10 deg from Sgr. The photometric properties of all of these stars are perfectly consistent with the previously determined distance, metallicity, and age of the Sgr galaxy. Our results indicate that Sgr is much larger than previously believed and that the stellar distribution in the outer parts of the galaxy is probably quite clumpy. We discuss the implications of our findings on the total luminosity and mass of Sgr and on the characteristics of its most recent past perigalacticon passages.
Kaluzny Janusz
Krzeminski Wojciech
Kubiak Mateo M. M.
Mateo Mario
Mirabal Nestor
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