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J/ApJ/836/7    SG1120-1202 members HST imaging & 24um fluxes    (Monroe+, 2017)

SG1120-1202: mass-quenching as tracked by UV emission in the group environment at z=0.37. Monroe J.T., Tran K.-V.H., Gonzalez A.H. <Astrophys. J., 836, 7-7 (2017)> =2017ApJ...836....7M (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, photometry ; Photometry, HST ; Ultraviolet ; Photometry, infrared ; Redshifts Keywords: galaxies: clusters: individual: "SG1120-1202"; galaxies: evolution; galaxies: photometry; galaxies: starburst; galaxies: structure Abstract: We use the Hubble Space Telescope to obtain WFC3/F390W imaging of the supergroup SG1120-1202 at z=0.37, mapping the UV emission of 138 spectroscopically confirmed members. We measure total (F390W-F814W) colors and visually classify the UV morphology of individual galaxies as "clumpy" or "smooth." Approximately 30% of the members have pockets of UV emission (clumpy) and we identify for the first time in the group environment galaxies with UV morphologies similar to the "jellyfish" galaxies observed in massive clusters. We stack the clumpy UV members and measure a shallow internal color gradient, which indicates that unobscured star formation is occurring throughout these galaxies. We also stack the four galaxy groups and measure a strong trend of decreasing UV emission with decreasing projected group distance (Rproj). We find that the strong correlation between decreasing UV emission and increasing stellar mass can fully account for the observed trend in (F390W-F814W)-Rproj, i.e., mass-quenching is the dominant mechanism for extinguishing UV emission in group galaxies. Our extensive multi-wavelength analysis of SG1120-1202 indicates that stellar mass is the primary predictor of UV emission, but that the increasing fraction of massive (red/smooth) galaxies at Rproj≲2R200 and existence of jellyfish candidates is due to the group environment. Description: We employ HST imaging of an ∼8'x12' mosaic across three filters: F390W (WFC3/UVIS), F606W (ACS/WFC), and F814W (ACS/WFC) for a total of 44 pointings (combined primary and parallels) during cycles 14 (GO 10499) and 19 (GO 12470). We use the Spitzer MIPS 24um fluxes from Saintonge+ (2008ApJ...685L.113S) and Tran+ (2009ApJ...705..809T). The 24um observations were retrieved from the Spitzer archive. For details on spectroscopy from multi-band ground-based observations using Magellan (in 2006), MMT, and VLT/VIMOS (in 2003), we refer the reader to Tran+ (2009ApJ...705..809T). Objects: ------------------------------------------------------------------- RA (ICRS) DE Designation(s) ------------------------------------------------------------------- 11 20.0 -12 02 SG1120-1202 = [GTC2005] SG J1120-1202 ------------------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 83 137 Observed properties of supergroup members
See also: J/ApJ/500/714 : Color-magnitude relation in CL 1358+62 (Van Dokkum+ 1998) J/ApJ/496/39 : Properties of poor groups of galaxies. I. (Zabludoff+ 1998) J/ApJS/137/117 : Las Campanas Distant Cluster Survey (LCDCS) (Gonzales+, 2001) J/ApJ/549/172 : X-ray-detected, poor groups galaxy populations (Tran+, 2001) J/ApJS/214/24 : 3D-HST+CANDELS catalog (Skelton+, 2014) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 18 A18 --- Name Identifier (JHHMMSS.s+DDMMSS.s) 20- 25 F6.4 --- z [0.3/0.4] Spectroscopic redshift 27- 29 I3 kpc Rproj [0/932] Projected radius 31- 34 F4.2 mJy F24 [0.03/6.1]? Spitzer/MIPS 24um flux density (1) 36- 39 F4.2 kpc Rhalf [0.4/6.6] Half-light radius in F814W image (2) 41- 45 F5.2 mag F814Wmag [18.5/23.4] HST/ACS F814W band magnitude (3) 47- 51 F5.3 mag e_F814Wmag [0.001/0.03] Uncertainty in F814Wmag 53- 57 F5.2 mag F390Wmag [20.7/25.5] HST/WFC3 F390W band magnitude (3) 59- 63 F5.3 mag e_F390Wmag [0.002/0.08] Uncertainty in F390Wmag 65- 68 F4.1 [Msun] logMass [8/12] Log stellar mass (4) 70- 81 A12 --- Clumpy Clumpy ("Clumpy" (39 occurrences), "Smooth" or "Unclassified" (8 occurrences)) 83 A1 --- f_Clumpy [J] J = Jellyfish candidate
Note (1): Errors corresponding to adopting different conversion factors for F24 microns to F8-1000um are ∼10-20%. Note (2): For galaxies with Rhalf>1kpc, Source Extractor measurements of the error on their spheroid radii are ∼1-8%. Note (3): Magnitudes are observed-frame. Note (4): See Tran+ (2009ApJ...705..809T) for errors in mass calculation.
History: From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 07-Sep-2017
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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