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J/ApJ/549/172       X-ray-detected, poor groups galaxy populations (Tran+, 2001)

The galaxy populations of X-ray-detected, poor groups. Tran K.-V.H., Simard L., Zabludoff A.I., Mulchaey J.S. <Astrophys. J. 549, 172 (2001)> =2001ApJ...549..172T
ADC_Keywords: Clusters, galaxy ; Morphology ; Magnitudes Keywords: galaxies: clusters: general - galaxies: evolution - galaxies: fundamental parameters - galaxies: structure Abstract: We determine the quantitative morphology and star formation properties of galaxies in six nearby X-ray-detected, poor groups using multiobject spectroscopy and wide-field R imaging. The mean recessional velocities of the galaxy groups range from 2843 to 7558km/s. Each group has 1538 confirmed members ranging in luminosity from dwarfs to giants (-13.7≥MR-5logh≥-21.9). We measure structural parameters for each galaxy by fitting a PSF-convolved, two-component model to their surface brightness profiles. To compare the samples directly, we fade, smooth, and rebin each galaxy image so that we effectively observe each galaxy at the same redshift (9000km/s) and physical resolution (0.87h-1kpc). The structural parameters are combined with [O II] measurements to test for correlations between morphological characteristics and current star formation in these galaxies. We compare results for the groups to a sample of field galaxies. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 80 18 Structural Parameters of Field Galaxies Measured at cz0 and cz=9000km/s table3.dat 80 171 Structural Parameters of Group Galaxies Measured at cz0 and cz=9000km/s
See also: Table 1: Group Properties Table 1: Group Properties -------------------------------------------------------------- Group RA (2000.0) DE N HRV sigma D km/s km/s -------------------------------------------------------------- NGC 2563 20 24 24. +21 05 46 36 4775±65 336±44 811 NGC 3557 11 09 58.5 -37 23 03 15 2843±64 282±50 488 NGC 4325 12 23 18.2 +10 37 19 23 7558±70 265±50 1272 NGC 5129 13 24 28.1 +13 55 32 34 6998±51 304±43 1173 HCG 42 10 00 13.1 -19 38 24 25 3830±47 266±37 654 HCG 62 12 53 12.4 -09 12 12 38 4356±50 376±52 741 -------------------------------------------------------------- Notes: RA, DE, <v> and sigma are from Zabludoff & Mulchaey, 1998. Cat. J/ApJ/496/39 N: Total number of group members in the 1°x1° field (Zabludoff & Mulchaey, 1998, Cat. J/ApJ/496/39). D: Physical diameter subtended by 1° at the group's mean recessional velocity (H0=100hkm/s/Mpc; q0=0.5) Byte-by-byte Description of file: table2.dat table3.dat
Bytes Format Units Label Explanations
1- 5 A5 --- Field Field name (1) 7- 10 I4 --- Gal Galaxy number in the field (1) 12- 15 I4 km/s cz Redshift 17- 19 I3 km/s e_cz Uncertainty in cz 21- 25 F5.1 mag RMag Absolute R band magnitude (2) 27- 30 F4.1 0.1nm EW The [O II] (3727Å) equivalent width 32- 35 F4.1 0.1nm e_EW Uncertainty in EW 37- 40 F4.2 --- B/T Bulge fraction (3) 42- 45 F4.2 kpc Rad Half-light radius (in kpc/h) (4) 47- 51 F5.2 kpc RatA Asymmetry parameter (in kpc/h) (5) 53- 57 F5.2 --- RatT ? Fraction of residual light (6) 59- 62 F4.2 --- B/T9 Bulge fraction at cz=9000 64- 68 F5.2 kpc Rad9 Half-light radius at cz=9000 (in kpc/h) 70- 74 F5.2 kpc RatA9 ? Asymmetry parameter at cz=9000 (in kpc/h) 76- 80 F5.2 --- RatT9 ? Fraction of residual light at cz=9000
Note (1): In Simbad, object are identified as [TSZ2001] HCG NN NNN and [TSZ2001] NGC NNNN NNN Note (2): RMag = MR - 5*log(h) where H0 = 100 km/s/Mpc, q0 = 0.5, and a flat cosmology. Note (3): Average error for B/T measurement is ∼0.1 (Simard et al. 2001, in prep.), although B/T can change by as much as 0.59 when the original (cz) and degraded (cz=9000km/s) values are compared for the individual galaxies. Note (4): Average error for Rad is ∼10% (Simard et al. 2001, in prep.). Note (5): Average random error for RatA is ∼0.02 (Simard et al. 2001, in prep.; Im et al. 2001, ApJ, submitted), although RatA can change by as much as 0.16 when the original (cz) and degraded (cz=9000km/s) values are compared. Note (6): Average random error for RatT is ∼0.02 (Simard et al. 2001, in prep.; Im et al. 2001, ApJ, submitted), although RatT can change by as much as 0.30 when the original (cz) and degraded (cz=9000km/s) values are compared.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 28-May-2001
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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