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J/ApJ/539/136     Properties of poor groups of galaxies. III. (Zabludoff+, 2000)

The properties of poor groups of galaxies. III. The galaxy luminosity function. Zabludoff A.I., Mulchaey J.S. <Astrophys. J. 539, 136 (2000)> =2000ApJ...539..136Z
ADC_Keywords: Clusters, galaxy ; Radial velocities ; Magnitudes Keywords: cosmology: large - scale structure of Universe - galaxies: clusters: general - galaxies: evolution - galaxies: luminosity function, mass function Abstract: The form of the galaxy luminosity function (GLF) in poor groups - regions of intermediate galaxy density that are common environments for galaxies - is not well understood. Multiobject spectroscopy and wide-field CCD imaging now allow us to measure the GLF of bound group members directly (i.e., without statistical background subtraction) and to compare the group GLF with the GLFs of the field and of rich clusters. We use R-band images in 1.5x1.5degree2 mosaics to obtain photometry for galaxies in the fields of six nearby (2800<cz<7700km/s) poor groups for which we have extensive spectroscopic data, including 328 new galaxy velocities. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 66 742 Galaxy data table2.dat 77 6 Group properties
See also: J/ApJ/496/39 : Properties of poor groups of galaxies. I. (Zabludoff+ 1998) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 12 A12 --- Name Galaxy name 14- 15 I2 h RAh Right Ascension (J2000) 18- 19 I2 min RAm Right Ascension (J2000) 22- 25 F4.1 s RAs Right Ascension (J2000) 30 A1 --- DE- Sign of the Declination (J2000) 31- 32 I2 deg DEd Declination (J2000) 35- 36 I2 arcmin DEm Declination (J2000) 39- 40 I2 arcsec DEs Declination (J2000) 47- 51 I5 km/s HRV Heliocentric radial velocity from NED 55- 57 I3 km/s e_HRV Uncertainty in HRV 60 I1 --- f_HRV Flag on the type of velocity measurement (1) 63- 66 F4.1 mag Rmag ? Magnitude in the R band
Note (1): Type of velocity measurement: 0: Velocity measured from absorption lines 1: Velocity measured from emission lines 2: Velocity measured from a combination of absorption and emission lines
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 8 A8 --- Group Group name (4) 10- 11 I2 h RAh Right ascension of the group optical projected centroid in J2000 13- 14 I2 min RAm Right ascension of the group optical projected centroid in J2000 16- 19 F4.1 s RAs Right ascension of the group optical projected centroid in J2000 21 A1 --- DE- Declination sign 22- 23 I2 deg DEd Declination of the group optical projected centroid in J2000 25- 26 I2 arcmin DEm Declination of the group optical projected centroid in J2000 28- 29 I2 arcsec DEs Declination of the group optical projected centroid in J2000 31- 32 I2 --- Ngroup Number of group members (1) 34- 37 I4 km/s <HRV> Mean heliocentric velocity (1) 39- 40 I2 km/s e_<HRV> rms uncertainty on <HRV> 42- 44 I3 km/s sigma Line-of-sight velocity dispersion 46- 47 I2 km/s E_sigma Error on sigma (upper limit) 49- 50 I2 km/s e_sigma Error on sigma (lower limit) 52- 55 F4.1 [10-7W] logLx X-ray luminosity (2) 57- 60 F4.2 Mpc rsample Sampling radius for the photometry 62- 63 I2 --- N'grp Number of members within rsample (4) (3) 65- 69 F5.1 Mpc-3 n0,4 Corrected number density of galaxies (5) 71- 73 F3.1 --- D/G0.4 Dwarf-to-giant ratio (6) 75- 77 F3.1 --- e_D/G0.4 rms uncertainty on D/G0.4
Note (1): Calculated within rsamp except for NGC 4325 (within 1.0h-1Mpc) and NGC 5129 (within0.9h-1Mpc) Note (2): From Mulchaey & Zabludoff (1998ApJ...496...73M) except for NGC 3557 (this paper) Note (3): Calculated within rsamp Note (4): For HGC 42, Ngrp{diff}N'grp because one member lies outside photometric survey boundary. For NGC 3557, marginally-detected in X-rays Note (5): Corrected number density of galaxies with MR≤-17+5logh, within 0.4h-1Mpc of the group center and assuming spherical symmetry Note (6): Dwarf-to-giant ratio for galaxies with MR≤-17+5logh and within 0.4h-1Mpc
History: From ApJ electronic version References: Zabudoff & Mulchaey, Paper I 1998ApJ...496...39Z, Cat. J/ApJ/496/39 Mulchaey & Zabudoff, Paper II 1998ApJ...496...73M
(End) Greg Schwartz [AAS], Patricia Bauer [CDS] 29-Aug-2000
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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