CDROM/APJ/V473/P822 MAPS Catalog of Galaxies (Hoffman+ 1996) ================================================================================ A Minnesota Automated Plate Scanner Catalog of Galaxies behind the Virgo Cluster and toward its Antipode G. Lyle Hoffman, John M. Dickey, Nanyao Y. Lu & Rene Fromhold-Treu <1996, ApJ, 473, 822> =1996ApJ...473..822H ================================================================================ Abstract: We present a catalog of 1268 galaxies, essentially complete to B <= 17.0, found by scanning glass copies of several fields of the original Palomar Sky Survey using the Minnesota Automated Plate Scanner in its isodensitometric mode (as opposed to the threshold densitometric mode used in the APS Catalog of the POSS I). In addition to the different scanning mode, we have employed a different star-galaxy separation method and have visually inspected POSS prints to verify that each image remaining in the catalog is non-stellar. The scanned fields are distributed generally in two areas, one around the outskirts of the Virgo Cluster, the other toward the antipode of the cluster (but still in the northern celestial hemisphere). The catalog gives the position of the center of each galaxy; estimates of the blue and red magnitudes within the outermost threshold crossing and of the blue magnitude extrapolated to zero surface brightness; blue and red diameters of four ellipses fit to the four threshold crossings (approximately 23.8, 23.6, 23.2, and 22.7 mag per square arcsec in blue, and 22.5, 22.4, 21.5 and 21.2 mag per square arcsec in red), and the ellipticities of those four ellipses. The catalog has served as a base from which to draw targets for a Tully-Fisher study of the Virgocentric infall velocity of the Local Group. Keywords: Galaxies: Spiral --- Galaxies: Irregular --- Galaxies: Photometry --- Galaxies: Clustering Description: Table 3 lists the galaxies found by the scanner in each of the 17 fields. The table is organized by CGCG field, with a local running reference number ordered by increasing right ascension within that field. B24 is our estimate of the faintest B magnitude consistent with the four threshold crossings for each galaxy, and Btot is our attempt to estimate the total B magnitude extrapolated to zero surface brightness. The diameters of circles with areas equal to the ellipses fit to the four threshold crossings are given, along with the ellipticities of those ellipses. For broken images ("clumps"), only the ellipticity of the outermost ellipse is given. File Summary: -------------------------------------------------------------------------------- File Name Lrecl Records Explanations -------------------------------------------------------------------------------- table3.dat 122 1268 Galaxies found by MAPS -------------------------------------------------------------------------------- Byte-by-byte Description of file: table3.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 3 I3 --- CGCG CGCG Field number 4- 7 I4 --- RefNo Running index for each field 8 1X --- --- Blank 9-17 A9 --- ID *Name from another catalog 18-21 F4.0 h RAh R.A. (1950), center of outermost ellipse 22-23 I2 min RAm R.A. 24-26 I3 0.1s RAs R.A. 27-30 F4.0 deg DEd Dec. (1950) 31-32 I2 arcmin DEm Dec. 33-35 I3 0.1arcsec DEs Dec. 36-40 F5.1 mag B24 *B magnitude to lowest threshold 41-45 F5.1 mag Btot B magnitude extrapolated 46-49 I4 arcsec Bd1 B diameter to lowest threshold 50-53 I4 arcsec Bd2 B diameter to second threshold 54-57 I4 arcsec Bd3 B diameter to third threshold 58-61 I4 arcsec Bd4 B diameter to highest threshold 62-66 F5.2 --- Be1 Ellipticity, lowest B threshold 67-71 F5.2 --- Be2 Ellipticity, second B threshold 72-76 F5.2 --- Be3 Ellipticity, third B threshold 77-81 F5.2 --- Be4 Ellipticity, highest B threshold 82-86 F5.1 mag R24 *R magnitude to lowest threshold 87-90 I4 arcsec Rd1 R diameter to lowest threshold 91-94 I4 arcsec Rd2 R iameter to second threshold 95-98 I4 arcsec Rd3 R diameter to third threshold 99-102 I4 arcsec Rd4 R diameter to highest threshold 103-107 F5.2 --- Re1 Ellipticity, lowest R threshold 108-112 F5.2 --- Re2 Ellipticity, second R threshold 113-117 F5.2 --- Re3 Ellipticity, third R threshold 118-122 F5.2 --- Re4 Ellipticity, highest Rthreshold ------------------------------------------------------------------------------- Notes for file: table3.dat ------------------------------------------------------------------------------- ID: "U" refers to UGC; "N" refers to NGC and "I" to IC; "Z" is short for Zwicky, i.e., CGCG; and "Mk" denotes a galaxy from Markarian et al. 1989, Soob. Spets. Astrofiz. Obs., No. 62 B24: The authors' estimate of the maximum magnitude B_24 (minimum luminosity) consistent with the threshold crossings on the blue POSS O plate. R24: The authors' estimate of the maximum magnitude R_24 (minimum luminosity) consistent with the threshold crossings on the red POSS E plate. -------------------------------------------------------------------------------- ================================================================================ (End) Lyle Hoffman [Lafayette College] 15-Mar-96