NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Evidence for dwarf stars at D of about 100 kiloparsecs near the Sextans dwarf spheroidal galaxyA method is presented for detecting individual, metal-poor, dwarf stars at distances less than about 150 kpc - a method specifically designed to filter out stars from among the much more numerous faint background field galaxies on the basis of broad-band colors. This technique is applied to two fields at high Galactic latitude, for which there are deep CCD data in four bands ranging from 3600 to 9000 A. The field in Sextans probably contains more than about five dwarf stars with BJ not greater than 25.5. These are consistent with being at a common distance about 100 kpc and lie about 1.7 deg from the newly discovered dwarf galaxy in Sextans whose distance is about 85 +/- 10 kpc. The stars lie near the major axis of the galaxy and are near or beyond the tidal radius. The second field, toward the south Galactic pole, may contain up to about five extra-Galactic stars, but these show no evidence for being at a common distance. Possible applications of this type technique are discussed, and it is shown that even very low surface brightness star clusters or dwarf galaxies may be detected at distances less than about 1 Mpc.
Document ID
19920050389
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Gould, Andrew (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Guhathakurta, Puragra (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Richstone, Douglas (Institute for Advanced Study Princeton, NJ, United States)
Flynn, Chris (Astronomisches Rechen-Institut Heidelberg, Federal Republic of Germany, United States)
Date Acquired
August 15, 2013
Publication Date
April 1, 1992
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 388
ISSN: 0004-637X
Subject Category
ASTROPHYSICS
Funding Number(s)
CONTRACT_GRANT: NSF AST-88-02533
CONTRACT_GRANT: NAS5-29225
CONTRACT_GRANT: NSF AST-87-20028
CONTRACT_GRANT: NSF PHY-86-20266
Distribution Limits
Public
Copyright
Other