J/ApJ/775/129 gri photometry in compact groups of galaxies (Walker+, 2013)
The optical green valley versus mid-infrared canyon in compact groups.
Walker L.M., Butterfield N., Johnson K., Zucker C., Gallagher S.,
Konstantopoulos I., Zabludoff A., Hornschemeier A.E., Tzanavaris P.,
Charlton J.C.
<Astrophys. J., 775, 129 (2013)>
=2013ApJ...775..129W 2013ApJ...775..129W
ADC_Keywords: Photometry, SDSS; Galaxies, optical
Keywords: galaxies: evolution; galaxies: groups: general;
galaxies: interactions; galaxies: photometry
Abstract:
Compact groups of galaxies provide conditions similar to those
experienced by galaxies in the earlier universe. Recent work on
compact groups has led to the discovery of a dearth of mid-infrared
transition galaxies (MIRTGs) in Infrared Array Camera (3.6-8.0µm)
color space as well as at intermediate specific star formation rates.
However, we find that in compact groups these MIRTGs have already
transitioned to the optical ([g-r]) red sequence. We investigate the
optical color-magnitude diagram (CMD) of 99 compact groups containing
348 galaxies and compare the optical CMD with mid-infrared (mid-IR)
color space for compact group galaxies. Utilizing redshifts available
from Sloan Digital Sky Survey, we identified new galaxy members for
four groups. By combining optical and mid-IR data, we obtain
information on both the dust and the stellar populations in compact
group galaxies. We also compare with more isolated galaxies and
galaxies in the Coma Cluster, which reveals that, similar to clusters,
compact groups are dominated by optically red galaxies. While we find
that compact group transition galaxies lie on the optical red
sequence, LVL+SINGS mid-IR transition galaxies span the range of
optical colors. The dearth of mid-IR transition galaxies in compact
groups may be due to a lack of moderately star-forming low mass
galaxies; the relative lack of these galaxies could be due to their
relatively small gravitational potential wells. This makes them more
susceptible to this dynamic environment, thus causing them to more
easily lose gas or be accreted by larger members.
Description:
For this study we compiled a sample of groups from the HCG catalog
(Hickson 1982, VII/213) and Redshift Survey Compact Group (RSCG)
catalog (Barton et al. 1996AJ....112..871B 1996AJ....112..871B).
In order to study the effect of galaxy environment, we compare the
compact group sample with galaxies from the Coma Cluster (Mahajan et
al. 2010, J/MNRAS/404/1745) as well as two samples of field galaxies:
the first from the low-z survey of the NYU value-added galaxy catalog
(VAGC; Blanton et al. 2005ApJ...631..208B 2005ApJ...631..208B, 2005AJ....129.2562B 2005AJ....129.2562B;
Adelman-McCarthy et al. 2008, II/282 (superseded by II/294);
Padmanabhan et al. 2008ApJ...674.1217P 2008ApJ...674.1217P); the second is LVL+SINGS (Dale
et al. 2007ApJ...655..863D 2007ApJ...655..863D, 2009, J/ApJ/703/517).
In addition to performing our own photometry, we also conducted a
consistency check against the VAGC. We converted SDSS magnitudes to AB
magnitudes, then applied K-corrections to z=0 using kcorrect v4_2
(Blanton & Roweis 2007AJ....133..734B 2007AJ....133..734B; See section 2.3).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 48 172 Photometry for HCG (Hickson Compact Group) galaxies
table3.dat 73 222 Photometry for RSCG (Redshift Survey Compact Group)
galaxies
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See also:
II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)
II/282 : The SDSS Photometric Catalog, Release 6 (Adelman-McCarthy+, 2007)
VII/213 : Hickson's Compact groups of Galaxies (Hickson+ 1982-1994)
J/ApJS/212/9 : X-ray sources in Hickson Compact Groups (Tzanavaris+, 2014)
J/A+A/565/A25 : Hickson compact groups Herschel observations (Bitsakis+, 2014)
J/A+A/540/A106 : SDSS-DR8 groups and clusters of galaxies (Tempel+, 2012)
J/A+A/533/A142 : UV-to-IR fluxes of Hickson compact groups (Bitsakis+, 2011)
J/MNRAS/418/1409 : Compact groups of galaxies in SDSS DR7 (Mendel+, 2011)
J/MNRAS/404/1745 : Dwarf galaxies in Coma supercluster (Mahajan+, 2010)
J/A+A/514/A102 : SDSS DR7 groups of galaxies (Tago+, 2010)
J/ApJ/703/517 : The Spitzer Local Volume Legacy: IR photometry (Dale+, 2009)
J/ApJS/173/293 : UV-Optical galaxy color-magnitude diagram I. (Wyder+, 2007)
J/AJ/130/425 : Distant compact groups of galaxies (De Carvalho+, 2005)
J/A+A/391/35 : Compact Groups in the UZC galaxy sample (Focardi+, 2002)
J/A+AS/137/495 : Halpha Catalogue of HCG Galaxies (Severgnini+, 1999)
J/AJ/116/1573 : Redshift Survey Compact Groups (Barton+, 1998)
J/ApJS/110/1 : Galaxies around HCGs (de Carvalho+ 1997)
J/A+AS/117/39 : Hickson Compact Groups of Galaxies I. (Allam+, 1996)
J/ApJ/399/353 : Radial velocities in Hickson compact groups (Hickson+ 1992)
http://www.sdss.org/ : SDSS home page
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- --- [HCG]
5- 7 I3 --- HCG [1/100] Hickson's Compact Group catalog identifier
(Cat. VII/213)
9- 10 I2 --- RSCG ? Alternate Redshift Survey Compact Group catalog
identifier (Barton et al. 1996AJ....112..871B 1996AJ....112..871B)
12- 13 A2 --- m_HCG [ a-hq] Galaxy in HCG group ( in Simbad)
15 A1 --- f_HCG [X] X: indicates a galaxy added by authors
17- 21 F5.2 mag gmag [11.3/17.9] The g' AB magnitude in SDSS system
23- 26 F4.2 mag e_gmag Uncertainty in gmag
28- 32 F5.2 mag rmag The r' band AB magnitude in SDSS system
34- 37 F4.2 mag e_rmag Uncertainty in rmag
39- 43 F5.2 mag imag [10.1/17.5] The i' AB magnitude in SDSS system
45- 48 F4.2 mag e_imag Uncertainty in imag
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [RSCG]
6- 7 I2 --- RSCG [1/86] Redshift Survey Compact Group catalog
identifier (rton et al. 1996AJ....112..871B 1996AJ....112..871B)
9 A1 --- n_RSCG [*] *: Group excluded in analysis (1)
11- 13 A3 --- m_RSCG [ /A-I] Galaxy member in RSCG group
15 A1 --- f_RSCG [X] X: indicates a galaxy added by authors
17- 40 A24 --- Name Common galaxy name
42- 46 F5.2 mag gmag ? The g' band AB magnitude in SDSS system
48- 51 F4.2 mag e_gmag ? Uncertainty in gmag
53- 57 F5.2 mag rmag ? The r' band AB magnitude in SDSS system
59- 62 F4.2 mag e_rmag ? Uncertainty in rmag
64- 68 F5.2 mag imag [8.4/16.9]? The i' AB magnitude in SDSS system
70- 73 F4.2 mag e_imag ? Uncertainty in imag
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Note (1):
* = Groups embedded in Perseus (RSCG 21) or Coma (RSCGs 67 & 68). These
were excluded from our analysis.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 17-Mar-2015