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J/AJ/135/1488     Rc photometry of galaxies in NGC 5353/4 group   (Tully+, 2008)

Midlife crises in dwarf galaxies in the NGC 5353/4 group. Tully R.B., Trentham N. <Astron. J., 135, 1488-1504 (2008)> =2008AJ....135.1488T (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Galaxies, photometry Keywords: galaxies: clusters: individual (NGC 5353/4) - galaxies: dwarf - galaxies: luminosity function, mass function - galaxies: photometry - galaxies: starburst Abstract: This third paper in a series about the dwarf galaxy populations in groups within the Local Supercluster concerns the intermediate mass (2.1x1013M) NGC 5353/4 Group with a core dominated by S0 systems and a periphery of mostly spiral systems. Dwarf galaxies are strongly concentrated toward the core. The mass-to-light ratio M/LR=105M/L is a factor of 3 lower than for the two groups studied earlier in the series. The properties of the group suggest it is much less dynamically evolved than those two groups of early-type galaxies. By comparison, the NGC 5353/4 Group lacks superluminous systems but has a large fraction of intermediate-luminosity galaxies; or equivalently, a luminosity function with a flatter faint-end slope. The luminosity function for the NGC 5353/4 Group should steepen as the intermediate-luminosity galaxies merge. Evidence for the ongoing collapse of the group is provided by the unusually large incidence of star-formation activity in small galaxies with early morphological types. The pattern in the distribution of galaxies with activity suggests a succession of infall events. Residual gas in dwarfs that enter the group is used up in sputtering events. The resolution of midlife crises is exhaustion. Description: The observations were made with wide-field imagers on the CFHT. The program was begun in the spring semester of 2002 with the camera called CFH 12k which provided a field of 42x28arcmin with 0.21" pixels. It was completed in the spring of 2003 with MegaCam which has a field of 1x1deg and 0.19" pixels. A total of 17deg2 were surveyed. Observations were made in queue mode with sub-arcsecond image quality and photometric conditions. During the 2002 semester with CFH 12k, 55x10min exposures were taken in the the Cousins R band. During the 2003 semester with MegaCam, 24x10min exposures were taken through the Gunn r filter. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 80 215 Members and candidate members of the NGC 5353/4 group
Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1 A1 --- C/P [<>] Core/Periphery code (1) 3- 5 I3 --- [TT2008] Source number within NGC 5353/4 group 7- 19 A13 --- Name Source name (2) 21- 26 A6 --- MType Morphology type 28 I1 --- Mm Source membership rating (3) 30- 33 I4 km/s HRV ? Heliocentric radial velocity 35- 36 I2 h RAh Hour of Right Ascension (J2000) 38- 39 I2 min RAm Minute of Right Ascension (J2000) 41- 44 F4.1 s RAs Second of Right Ascension (J2000) 46 A1 --- DE- Sign of Declination (J2000) 47- 48 I2 deg DEd Degree of Declination (J2000) 50- 51 I2 arcmin DEm Arcminute of Declination (J2000) 53- 54 I2 arcsec DEs Arcsecond of Declination (J2000) 56- 61 F6.4 deg r Radial distance from center of group 63- 67 F5.2 mag Rc350 Apparent Cousins R band magnitude within a metric aperture of 350pc radius 69- 73 F5.2 mag Rcmag Apparent Cousins R band magnitude within a ∼25mag/arcsec2 surface brightness radius 75- 80 F6.2 mag RcMAG Absolute Cousins R band magnitude
Note (1): Code as follows: < = Candidate within radius of 1.23degrees=625kpc (ordered by luminosity) > = Candidate outside radius of 1.23degrees (ordered by distance from center of group Note (2): SDSS J13 stands for SDSS J134900.05+413758.2 Note (3): Source rating code as follows: 0 = a luminous galaxy with known velocity at the inception of the study 1 = probable member 2 = possible members 3 = plausible member 4 = almost always background 5 = new velocities consistent with group membership but with sufficiently high surface brightness such that it was excluded by our ICP/OCP filters
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 12-Oct-2010
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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