J/A+A/585/A47 CALIFA color/metallicity gradients connections (Marino+, 2016) ================================================================================ Outer-disk reddening and gas-phase metallicities: The CALIFA connection. Marino R.A., Gil de Paz A., Sanchez S.F., Sanchez-Blazquez P., Cardiel N., Castillo-Morales A., Pascual S., Vilchez J., Kehrig C., Molla M., Mendez-Abreu J., Catalan-Torrecilla C., Florido E., Perez I., Ruiz-Lara T., Ellis S., Lopez-Sanchez A.R., Gonzalez Delgado R.M., De Lorenzo-Caceres A., Garcia-Benito R., Galbany L., Zibetti S., Cortijo C., Kalinova V., Mast D., Iglesias-Paramo J., Papaderos P., Walcher C.J., Bland-Hawthorn J., (the Califa Team) =2016A&A...585A..47M (SIMBAD/NED BibCode) ================================================================================ ADC_Keywords: Galaxies, photometry ; Photometry, SDSS Keywords: galaxies: abundances - galaxies: evolution - galaxies: photometry - galaxies: ISM - ISM: abundances - HII regions Abstract: We study, for the first time in a statistically significant and well-defined sample, the relation between the outer-disk ionized-gas metallicity gradients and the presence of breaks in the surface brightness profiles of disk galaxies. Sloan Digital Sky Survey (SDSS) g'- and r'-band surface brightness, (g'-r') color, and ionized-gas oxygen abundance profiles for 324 galaxies within the Calar Alto Legacy Integral Field Area (CALIFA) survey are used for this purpose. We perform a detailed light-profile classification, finding that 84% of our disks show down- or up-bending profiles (Type II and Type III, respectively), while the remaining 16% are well fitted by one single exponential (Type I). The analysis of the color gradients at both sides of this break shows a U-shaped profile for most Type II galaxies with an average minimum (g'-r') color of ~0.5mag and an ionized-gas metallicity flattening associated with it only in the case of low-mass galaxies. Comparatively, more massive systems show a rather uniform negative metallicity gradient. The correlation between metallicity flattening and stellar mass for these systems results in p-values as low as 0.01. Independent of the mechanism having shaped the outer light profiles of these galaxies, stellar migration or a previous episode of star formation in a shrinking star-forming disk, it is clear that the imprint in their ionized-gas metallicity was different for low- and high-mass Type II galaxies. In the case of Type III disks, a positive correlation between the change in color and abundance gradient is found (the null hypothesis is ruled out with a p-value of 0.02), with the outer disks of Type III galaxies with masses <=10^10^M_{sun}_ showing a weak color reddening or even a bluing. This is interpreted as primarily due to a mass downsizing effect on the population of Type III galaxies that recently experienced an enhanced inside-out growth. Description: We have selected the 350 galaxies observed by the CALIFA survey (Sanchez et al., 2012A&A...538A...8S) at the CAHA 3.5m telescope with Potsdam Multi Aperture Spectrograph (PMAS) in the PPak mode and processed by the CALIFA v1.5 pipeline up to September 2014. The SDSS g' and r' SB and (g'-r') color profiles were derived using the DR10 data products, in particular, we used the swarp mosaicking code (Ahn et al., 2014ApJS..211...17A). We obtain spectroscopic information for ~15130 HII regions (or complexes) from our 324 CALIFA data cubes using HII explorer. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file tableb1.dat 86 326 Disk classification and physical properties of the CALIFA galaxies tableb2.dat 74 131 Derived physical properties at break radius for the CALIFA galaxies -------------------------------------------------------------------------------- See also: J/A+A/559/A114 : Updated O3N2 and N2 abundance indicators (Marino+, 2013) J/A+A/573/A59 : Gas kinematics in CALIFA survey (Garcia-Lorenzo+, 2015) J/A+A/576/A135 : CALIFA DR2 (Garcia-Benito+, 2015) J/A+A/581/A103 : CALIFA survey across the Hubble sequence (Gonzalez+, 2015) J/A+A/582/A21 : Merging galaxies (mis)alignments (Barrera-Ballesteros+, 2015) J/A+A/584/A87 : CALIFA sample SFR calibration (Catalan-Torrecilla+, 2015) Byte-by-byte Description of file: tableb1.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 14 A14 --- Name Galaxy name (G1) 17- 22 F6.4 --- z Heliocentric redshift z distance obtained from the NED database 25- 32 A8 --- PType Photometrical type obtained from our analysis of the SDSS r'-band profile 36- 40 A5 --- MType Morphological type 44- 48 F5.2 [Msun] log(M*) ?=- Stellar mass 52- 57 F6.2 mag RMAG ?=- Absolute R-band magnitude 60- 64 F5.2 kpc Reff Effective radius 68- 71 F4.2 --- Rg'b ?=- Break radii obtained as the minimum of the double bootstrapping fit to the SDSS g'-band in Reff unit 73- 76 F4.2 --- e_Rg'b ? rms uncertainty on Rgb 78- 81 F4.2 --- Rr'b ?=- Break radii obtained as the minimum of the double bootstrapping fit to the SDSS i'-band in Reff unit 83- 86 F4.2 --- e_Rr'b ? rms uncertainty on Rr'b -------------------------------------------------------------------------------- Byte-by-byte Description of file: tableb2.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 14 A14 --- Name Galaxy name (G1) 17- 24 A8 --- PhotT Photometrical type obtained from our analysis of the SDSS r'-band profiles 26- 29 F4.2 --- Rr'b Break radius obtained as the minimum of the double bootstrapping fit to the SDSS r'-band data in units of their Reff 31- 34 F4.2 --- e_Rr'b rms uncertainty on Rr'b 36- 40 F5.3 --- Da(O/H) Difference between the outer-to-the- inner slopes as measured in the oxygen profiles 42- 46 F5.3 --- e_Da(O/H) rms uncertainty on Da(O/H) 48- 52 F5.3 --- Dacolor Difference between the outer-to-the- inner slopes as measured in the (g'-r') color profiles 54- 58 F5.3 --- e_Dacolor rms uncertainty on Dacolor 60- 64 F5.2 mag/arcsec+2 mur'brk r'-band surface brightness computed at the r' break radius 66- 69 F4.2 mag (g'-r')r'b color value computed at the r' break radius 71- 74 F4.2 [-] (O/H)r'b Oxygen abundance value computed at the r' break radius -------------------------------------------------------------------------------- Global notes: Note (G1): SDSS J100141 = SDSS J100141.02+371447.4, 2MASXJ01331766 = 2MASX J01331766+1319567 -------------------------------------------------------------------------------- History: From electronic version of the journal ================================================================================ (End) Patricia Vannier [CDS] 09-Mar-2016