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J/ApJ/792/L4      GV galaxies UV-optical radial color profiles      (Pan+, 2014)

Quenching depends on morphologies: implications from the ultraviolet-optical radial color distributions in green valley galaxies. Pan Z., Li J., Lin W., Wang J., Kong X. <Astrophys. J., 792, L4 (2014)> =2014ApJ...792L...4P (SIMBAD/NED BibCode)
ADC_Keywords: Galaxy catalogs ; Galaxies, photometry ; Photometry, SDSS ; Photometry, ultraviolet ; Colors ; Redshifts Keywords: galaxies: evolution - galaxies: star formation Abstract: In this Letter, we analyze the radial ultraviolet-optical color distributions in a sample of low redshift green valley galaxies, with the Galaxy Evolution Explorer (GALEX)+Sloan Digital Sky Survey (SDSS) images, to investigate how the residual recent star formation is distributed in these galaxies. We find that the dust-corrected u-r colors of early-type galaxies (ETGs) are flat out to R90, while the colors monotonously turn blue when r>0.5 R50 for late-type galaxies (LTGs). More than half of the ETGs are blue-cored and have remarkable positive NUV-r color gradients, suggesting that their star formations are centrally concentrated. The rest have flat color distributions out to R90. The centrally concentrated star formation activity in a large portion of ETGs is confirmed by the SDSS spectroscopy, showing that ∼50% of the ETGs have EW(Hα)>6.0 Å. Of the LTGs, 95% show uniform radial color profiles, which can be interpreted as a red bulge plus an extended blue disk. The links between the two kinds of ETGs, e.g., those objects having remarkable "blue-cores" and those having flat color gradients, are less known and require future investigations. It is suggested that the LTGs follow a general model by which quenching first occurs in the core regions, and then finally extend to the rest of the galaxy. Our results can be re-examined and have important implications for the IFU surveys, such as MaNGA and SAMI. Description: Our parent sample is drawn from Schawinski et al. (2014MNRAS.440..889S), which contains ∼46000 galaxies at the redshift range of z = [0.02, 0.05]. This sample is magnitude completed to M_z, Petro_ = -19.5 AB mag and with Galaxy Zoo (Lintott 2008MNRAS.389.1179L; 2011, J/MNRAS/410/166) visual morphological classifications (http://data.galaxyzoo.org/). The stellar masses are derived by fitting the five SDSS photometric bands to a library of 6.8x106 models of star formation histories generated from Maraston et al. (1998MNRAS.300..872M; 2005MNRAS.362..799M) stellar models. We follow the process of Schawinski et al. (2014MNRAS.440..889S) to select GV galaxies. First, the galaxies are k-corrected to z = 0 using the KCORRECT code of Blanton & Roweis (2007AJ....133..734B) with the SDSS five broadband photometry. Then, the magnitudes are corrected for dust reddening using estimates of internal extinction from the stellar continuum fits by Oh et al. (2011ApJS..195...13O), applying the Cardelli et al. (1989ApJ...345..245C) law. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file fig2.dat 284 336 The radial dust-corrected u-r color profiles fig3.dat 282 336 The radial dust-corrected NUV-r color profiles
See also: II/312 : GALEX-DR5 (GR5) sources from AIS and MIS (Bianchi+ 2011) V/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015) J/MNRAS/410/166 : Morphological types from Galaxy Zoo 1 (Lintott+, 2011) Byte-by-byte Description of file: fig2.dat
Bytes Format Units Label Explanations
1- 18 A18 --- SDSS SDSS identifier 20- 28 F9.5 deg RAdeg Right Ascension in decimal degrees (J2000) 30- 37 F8.5 deg DEdeg Declination in decimal degrees (J2000) 39- 46 F8.6 --- z Redshift 48- 51 F4.2 --- Code [1.00-4.00] Galaxy code type (G1) 53- 56 F4.2 --- BPT [0/4.00] Baldwin et al. 1981 classification (1981PASP...93....5B) (G2) 58- 64 F7.4 mag umag SDSS u band magnitude (G3) 66- 72 F7.4 mag gmag SDSS g band magnitude (G3) 74- 80 F7.4 mag rmag SDSS r band magnitude (G3) 82- 88 F7.4 mag imag SDSS i band magnitude (G3) 90- 96 F7.4 mag zmag SDSS z band magnitude (G3) 98-106 F9.6 [Msun] logM Log mass 108-113 F6.4 mag E(B-V) The (B-V) color excess 115-120 F6.3 arcsec R50 Radius enclosing 50% SDSS r band flux 122-127 F6.3 arcsec R90 Radius enclosing 90% SDSS r band flux 129-134 F6.3 --- rdev de Vaucouleurs fit scale radius in r band 136-140 F5.3 --- b/a The de Vaucouleurs fit axial ratio 142-147 I6 --- Li Matched Li et al. 2014 catalog (in preparation) identifier (NNNNNN) 149-151 I3 --- Index [1/239] Running index number (G4) 153-158 F6.3 [-] logR1 Log radius/R50 at first radius 160-165 F6.3 [-] logR2 Log radius/R50 at second radius 167-172 F6.3 [-] logR3 Log radius/R50 at third radius 174-179 F6.3 [-] logR4 Log radius/R50 at fourth radius 181-186 F6.3 [-] logR5 Log radius/R50 at fifth radius 188-196 F9.6 mag (u-r)1 The (u-r) color at first radius (G5) 198-205 F8.6 mag (u-r)2 The (u-r) color at second radius (G5) 207-214 F8.6 mag (u-r)3 The (u-r) color at third radius (G5) 216-223 F8.6 mag (u-r)4 The (u-r) color at fourth radius (G5) 225-233 F9.6 mag (u-r)5 The (u-r) color at fifth radius (G5) 235-242 F8.6 mag e_(u-r)1 Error in (u-r)1 244-251 F8.6 mag e_(u-r)2 Error in (u-r)2 253-260 F8.6 mag e_(u-r)3 Error in (u-r)3 262-269 F8.6 mag e_(u-r)4 Error in (u-r)4 271-278 F8.6 mag e_(u-r)5 Error in (u-r)5 280-282 A3 --- Type Galaxy type; ETG or LTG 284 I1 --- Color [0-1] Color code (G6)
Byte-by-byte Description of file: fig3.dat
Bytes Format Units Label Explanations
1- 18 A18 --- SDSS SDSS identifier 20- 28 F9.5 deg RAdeg Right Ascension in decimal degrees (J2000) 30- 37 F8.5 deg DEdeg Declination in decimal degrees (J2000) 39- 46 F8.6 --- z Redshift 48- 51 F4.2 --- Code [1.00-4.00] Galaxy code type (G1) 53- 56 F4.2 --- BPT [0/4.00] Baldwin et al. 1981 classification (1981PASP...93....5B) (G2) 58- 64 F7.4 mag umag SDSS u band magnitude (G3) 66- 72 F7.4 mag gmag SDSS g band magnitude (G3) 74- 80 F7.4 mag rmag SDSS r band magnitude (G3) 82- 88 F7.4 mag imag SDSS i band magnitude (G3) 90- 96 F7.4 mag zmag SDSS z band magnitude (G3) 98-106 F9.6 [Msun] logM Log mass 108-113 F6.4 mag E(B-V) The (B-V) color excess 115-120 F6.3 arcsec R50 Radius enclosing 50% SDSS r band flux 122-127 F6.3 arcsec R90 Radius enclosing 90% SDSS r band flux 129-134 F6.3 --- rdev de Vaucouleurs fit scale radius in r band 136-140 F5.3 --- b/a The de Vaucouleurs fit axial ratio 142-147 I6 --- Li Matched Li et al. 2014 catalog (in preparation) identifier (NNNNNN) 149-151 I3 --- Index [1/239] Running index number (G4) 153-158 F6.3 [-] logR1 Log radius/R50 at first radius 160-165 F6.3 [-] logR2 Log radius/R50 at second radius 167-172 F6.3 [-] logR3 Log radius/R50 at third radius 174-179 F6.3 [-] logR4 Log radius/R50 at fourth radius 181-186 F6.3 [-] logR5 Log radius/R50 at fifth radius 188-195 F8.6 mag (NUV-r)1 The (NUV-r) color at first radius (G5) 197-204 F8.6 mag (NUV-r)2 The (NUV-r) color at second radius (G5) 206-213 F8.6 mag (NUV-r)3 The (NUV-r) color at third radius (G5) 215-222 F8.6 mag (NUV-r)4 The (NUV-r) color at fourth radius (G5) 224-231 F8.6 mag (NUV-r)5 The (NUV-r) color at fifth radius (G5) 233-240 F8.6 mag e_(NUV-r)1 Error in (NUV-r)1 242-249 F8.6 mag e_(NUV-r)2 Error in (NUV-r)2 251-258 F8.6 mag e_(NUV-r)3 Error in (NUV-r)3 260-267 F8.6 mag e_(NUV-r)4 Error in (NUV-r)4 269-276 F8.6 mag e_(NUV-r)5 Error in (NUV-r)5 278-280 A3 --- Type Galaxy type; ETG or LTG 282 I1 --- Color [0-1] Color code (G6)
Global notes: Note (G1): Galaxy code type as follows: 1.00 = early type; 4.00 = late type. Note (G2): Classification as follows: 0.00 = no emission lines; 1.00 = star-forming; 2.00 = composite; 3.00 = Seyfert; 4.00 = LINER. Note (G3): K-corrected to z=0 and reddening-corrected. Note (G4): There are 121 ETGs and 239 LTGs. Note (G5): Dust-corrected. Note (G6): Color code as follows: 0 = blue-colored; 1 = red-colored.
History: From electronic version of the journal
(End) Prepared by [AAS], Tiphaine Pouvreau [CDS] 04-Apr-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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