Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...195.0911f&link_type=abstract
American Astronomical Society, 195th AAS Meeting, #09.11; Bulletin of the American Astronomical Society, Vol. 31, p.1385
Astronomy and Astrophysics
Astronomy
Scientific paper
We present preliminary results from a wide-field survey of the Leo I Group for dwarf spheroidal (dSph) galaxies. Using 7 degrees2\ imaged with the KPNO MOSAIC+0.9m, we probe the faint-end of the R-band luminosity function well below the magnitude and surface brightness limits of existing surveys, with a target limiting absolute magnitude of Mlim = -10. We employ a detection method, based on work by Dalcanton et al. (1997, AJ, 114, 635), whereby we mask the images of all high-surface-brightness features, then convolve with a matched exponential filter for dSph-sized objects. Detection biases and completeness are fully determined by extensive Montecarlo simulations of artificial galaxies added to the real data frames. A typical Local Group dSph, if seen at the distance of Leo I (10 Mpc), will have a large angular size and a low surface brightness. Preliminary limits suggest we can detect the faintest and most diffuse Local Group dSphs -- Draco, Carina and Antlia -- with a 60-80% detection efficiency, and the smallest dwarf members -- Sextans and Ursa Minor -- with a 40% detection efficiency. This work presents our technique and preliminary dwarf galaxy candidates from a 1° x 2° \ subsample of our data.
Bolte Michael
Flint K. P.
Mendes de Oliveira Claudia
Metevier Anne J.
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