J/ApJ/821/113 HCG and RSCG compact group galaxies with WISE (Zucker+, 2016)
Hierarchical formation in action: characterizing accelerated galaxy evolution
in compact groups using whole-sky WISE data.
Zucker C., Walker L.M., Johnson K., Gallagher S., Alatalo K., Tzanavaris P.
<Astrophys. J., 821, 113-113 (2016)>
=2016ApJ...821..113Z 2016ApJ...821..113Z (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, IR ; Photometry, infrared ; Morphology
Keywords: galaxies: evolution; galaxies: groups: general; galaxies: interactions
Abstract:
Compact groups provide an environment to study the growth of galaxies
amid multiple prolonged interactions. With their dense galaxy
concentrations and relatively low velocity dispersions, compact groups
mimic the conditions of hierarchical galaxy assembly. Compact group
galaxies are known to show a bimodality in Spitzer IRAC infrared color
space: galaxies are preferentially either quiescent with low specific
star formation rates (SSFRs) or prolifically forming stars-galaxies
with moderate levels of specific star formation are rare. Previous
Spitzer IRAC studies identifying this "canyon" have been limited
by small number statistics. We utilize whole-sky Wide-field Infrared
Survey Explorer (WISE) data to study 163 compact groups, thereby
tripling our previous sample and including more galaxies with
intermediate mid-IR colors indicative of moderate SSFRs. We define a
distinct WISE mid-IR color space (log[f12/f4.6]) versus
(log[f22/f3.4]) that we use to identify canyon galaxies from the
larger sample. We confirm that compact group galaxies show a bimodal
distribution in the mid-infrared and identify 37 canyon galaxies with
reliable photometry and intermediate mid-IR colors. Morphologically,
we find that the canyon harbors a large population of both Sa-Sbc and
E/S0 type galaxies, and that they fall on the optical red sequence
rather than the green valley. Finally, we provide a catalog of WISE
photometry for 567 of 652 galaxies selected from the sample of 163
compact groups.
Description:
For this study, we draw our sample from groups in the HCG catalog
(Hickson 1982, VII/213) and the Redshift Survey Compact Group catalog
(RSCG; Barton et al. 1996AJ....112..871B 1996AJ....112..871B).
We utilize new ALLWISE coadds from Lang (unWISE; 2014AJ....147..108L 2014AJ....147..108L),
which preserve the native resolution of the raw frames (∼6.1", 6.4",
6.5" and 12.0" for bands W1, W2, W3, and W4).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 107 567 WISE galaxies from full sample
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See also:
II/328 : AllWISE Data Release (Cutri+ 2013)
VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)
VII/238 : HYPERLEDA. II. Homogenized HI data (Paturel+, 2003)
VII/213 : Hickson's Compact groups of Galaxies (Hickson+ 1982-1994)
VII/155 : Third Reference Cat. of Bright Galaxies (RC3) (de Vaucouleurs+ 1991)
J/ApJS/212/9 : X-ray sources in Hickson Compact Groups (Tzanavaris+, 2014)
J/ApJ/775/129 : gri photometry in compact groups of galaxies (Walker+, 2013)
J/ApJ/723/895 : IR luminosities and aromatic features of 5MUSES (Wu+, 2010)
J/ApJ/713/970 : Low-resolution SED templates for AGNs & gal. (Assef+, 2010)
J/PASP/112/1008 : Near-infrared galaxy morphology atlas (Jarrett+, 2000)
J/AJ/116/1573 : Redshift Survey Compact Groups (Barton+, 1998)
J/ApJ/399/353 : Radial velocities in Hickson compact groups (Hickson+ 1992)
http://unwise.me/ : unWISE webpage
http://www.sdss.org/ : SDSS home page
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- Group Group identifier (HCG or RSCG number)
8- 29 A22 --- Name Galaxy identifier
31- 37 F7.2 mJy F3.4 [0.07/1154] WISE W1 (3.4 um) band flux density
39- 43 F5.2 mJy e_F3.4 [0/12] Uncertainty in F3.4
45- 50 F6.2 mJy F4.6 [0.04/592] WISE W2 (4.6 um) band flux density
52- 55 F4.2 mJy e_F4.6 [0/6.2] Uncertainty in F4.6
57- 62 F6.2 mJy F12 [0.04/906] WISE W3 (12 um) band flux density
64- 67 F4.2 mJy e_F12 [0/5] Uncertainty in F12
69- 75 F7.2 mJy F22 [1.4/2328] WISE W4 (22 um) band flux density
77- 81 F5.2 mJy e_F22 [0.1/38] Uncertainty in F22
83- 86 A4 --- MType Morphology from HyperLeda (1)
88- 91 F4.1 --- TT [-5/10]? De Vaucouleurs (VII/155) morphological
type from HyperLeda (1)
93-101 A9 --- Class WISE Class (2)
103 I1 --- Type [1/3] Photometry type (3)
105-107 A3 --- Lim [Yes/No ] Upper Limit (4)
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Note (1): The morphological types and De Vaucouleurs numbers are from the
HyperLeda database (Paturel et al. 2003, VII/237; 2003, VII/238),
which accumulates morphologies from available publications and
compares and combines them to determine an optimal De Vaucouleurs
number and classification for each galaxy.
Note (2): See Section 3.2 and Figure 2 for explanation of WISE classification
scheme (273 "Quiescent", 57 "Canyon" and 237 "Active").
Note (3): We divide the photometry into three groups, based on their resolution
and S/N in W1 through W4 as follows:
1 = Galaxies resolved in W1, W2, W3, and W4 (photometry performed with
SURPHOT);
2 = Galaxies resolved in W1, W2, and W3, but with a w4rchi2<2, we perform
photometry on W1, W2, and W3 using the same methodology as group 1 and
pull the W4 fluxes (w4mpro) from the ALLWISE source catalog.
3 = Galaxies that (a) have too low S/N for us to apply a 1σ contour
to them and (b) cannot be individually resolved with a 3σ
contour due to small projected separation, we pull photometry for W1,
W2, W3, and W4 from the ALLWISE source catalog.
See Section 2.2 for the full description of photometry types.
Note (4): Indicates whether there is an upper limit in a single band (either
W3 or W4); galaxies with upper limits in more than one band are
excluded from the full sample. In cases where the galaxy has an
upper limit, the error in that band is set to null in the ALLWISE
source catalog, and we quote the ratio of S/SNR as the uncertainty.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 25-Jul-2016