Astronomy and Astrophysics – Astrophysics
Scientific paper
1997-05-12
Astronomy and Astrophysics
Astrophysics
Latex file, 41 pages total, including 13 pages of figures, uses aaspp4.sty & psfig.sty. Accepted to the Astronomical Journal
Scientific paper
10.1086/118499
We present results of a large area CCD survey for low surface brightness galaxies (LSBs) that reaches central surface brightnesses of mu_0=25 mag/sqr-" in V. We have analyzed 17.5 degrees of transit scan data, and identified a statistical subset of 7 pure disk LSB's with mu_0 fainter than 23V-mag/sqr-" and with angular exponential scale lengths larger than alpha=2.5". The LSB detection is entirely automated, and the selection efficiency of the survey is well-quantified. After correcting for the selection efficiency, we find a surface density of 4.1^{+2.6}_{-2.1} galaxies/deg^2 for LSBs in the considered range of mu_0 and alpha (90% confidence levels). The final sample of LSBs are at distances comparable to those probed by large galaxy catalogs, and have intrinsic scale lengths of 1.7-3.6 kpc (H=50km/s/Mpc), based upon optical redshifts. We use the redshifts and the selection efficiency to calculate the number density in LSBs with 23
Dalcanton Julianne J.
Gunn James E.
Schmidt Matthias
Schneider David P.
Spergel David N.
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