2014A&A...563A..49S


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.14CEST19:43:50

2014A&A...563A..49S - Astronomy and Astrophysics, volume 563A, 49-49 (2014/3-1)

A characteristic oxygen abundance gradient in galaxy disks unveiled with CALIFA.

SANCHEZ S.F., ROSALES-ORTEGA F.F., IGLESIAS-PARAMO J., MOLLA M., BARRERA-BALLESTEROS J., MARINO R.A., PEREZ E., SANCHEZ-BLAZQUEZ P., GONZALEZ DELGADO R., CID FERNANDES R., DE LORENZO-CACERES A., MENDEZ-ABREU J., GALBANY L., FALCON-BARROSO J., MIRALLES-CABALLERO D., HUSEMANN B., GARCIA-BENITO R., MAST D., WALCHER C.J., GIL DE PAZ A., GARCIA-LORENZO B., JUNGWIERT B., VILCHEZ J.M., JILKOVA L., LYUBENOVA M., CORTIJO-FERRERO C., DIAZ A.I., WISOTZKI L., MARQUEZ I., BLAND-HAWTHORN J., ELLIS S., VAN DE VEN G., JAHNKE K., PAPADEROS P., GOMES J.M., MENDOZA M.A., LOPEZ-SANCHEZ A.R. (The CALIFA collaboration)

Abstract (from CDS):

We present the largest and most homogeneous catalog of HII regions and associations compiled so far. The catalog comprises more than 7000 ionized regions, extracted from 306 galaxies observed by the CALIFA survey. We describe the procedures used to detect, select, and analyze the spectroscopic properties of these ionized regions. In the current study we focus on characterizing of the radial gradient of the oxygen abundance in the ionized gas, based on the study of the deprojected distribution of HII regions. We found that all galaxies without clear evidence of an interaction present a common gradient in the oxygen abundance, with a characteristic slope of αO/H=-0.1dex/re between 0.3 and 2 disk effective radii (re), and a scatter compatible with random fluctuations around this value, when the gradient is normalized to the disk effective radius. The slope is independent of morphology, the incidence of bars, absolute magnitude, or mass. Only those galaxies with evidence of interactions and/or clear merging systems present a significantly shallower gradient, consistent with previous results. The majority of the 94 galaxies with HII regions detected beyond two disk effective radii present a flattening in the oxygen abundance. The flattening is statistically significant. We cannot provide a conclusive answer regarding the origin of this flattening. However, our results indicate that its origin is most probably related to the secular evolution of galaxies. Finally, we find a drop/truncation of the oxygen abundance in the inner regions for 26 of the galaxies. All of them are non-interacting, mostly unbarred Sb/Sbc galaxies. This feature is associated with a central star-forming ring, which suggests that both features are produced by radial gas flows induced by resonance processes. Our result suggests that galaxy disks grow inside-out, with metal enrichment driven by the local star formation history and with a small variation galaxy-by-galaxy. At a certain galactocentric distance, the oxygen abundance seems to be correlated well with the stellar mass density and total stellar mass of the galaxies, independently of other properties of the galaxies. Other processes, such as radial mixing and inflows/outflows seem to have a limited effect on shaping of the radial distribution of oxygen abundances, although they are not ruled out.

Abstract Copyright:

Journal keyword(s): HII regions - galaxies: ISM - ISM: abundances - galaxies: abundances - galaxies: evolution - galaxies: star formation

Simbad objects: 23

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Number of rows : 23

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 UGC 312 AGN 00 31 23.840 +08 28 01.32   14.6   13.10   ~ 87 0
2 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 10905 1
3 NGC 300 GiG 00 54 53.4460065856 -37 41 03.182962667 8.83 8.69 8.13 7.46   ~ 1306 2
4 M 33 GiG 01 33 50.904 +30 39 35.79 6.17 6.27 5.72     ~ 5135 1
5 M 74 G 01 36 41.772 +15 47 00.46 10.52 10.00 9.46 9.16   ~ 1401 1
6 NGC 638 GiG 01 39 37.8434689430 +07 14 14.124561107   14.4       ~ 43 0
7 NGC 925 H2G 02 27 16.913 +33 34 43.97   10.69 10.12 9.55   ~ 694 1
8 M 77 GiP 02 42 40.771 -00 00 47.84 9.70 9.61 8.87 10.1 9.9 ~ 4093 2
9 NGC 1073 EmG 02 43 40.598 +01 22 33.13   11.3   11.3 11.8 ~ 306 0
10 NGC 1512 GiP 04 03 54.281 -43 20 55.86 11.30 11.43 10.54 10.37   ~ 322 1
11 NGC 2347 LIN 07 16 04.087 +64 42 41.54   13.2       ~ 103 0
12 NGC 2403 AGN 07 36 51.396 +65 36 09.17 9.31 8.84 8.38 8.19   ~ 1608 1
13 NGC 3621 AGN 11 18 16.300 -32 48 45.36 10.10 9.44 9.56 8.07 10.1 ~ 488 3
14 M 106 Sy2 12 18 57.620 +47 18 13.39   9.14 8.41 8.11   ~ 2115 3
15 NGC 4676 IG 12 46 10.18 +30 43 53.7   14.1       ~ 297 0
16 NGC 4725 Sy2 12 50 26.5692916552 +25 30 02.737610391   13.45 12.44     ~ 621 2
17 M 51 GiP 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 3782 4
18 M 83 SBG 13 37 00.919 -29 51 56.74 8.85 8.11 7.52 7.21   ~ 2229 2
19 NGC 5947 AGN 15 30 36.5917232336 +42 43 01.769106580   14.8       ~ 60 0
20 IC 4553 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 2683 4
21 NGC 7716 G 23 36 31.458 +00 17 50.33   12.9   13.0 12.6 ~ 138 0
22 NAME Galactic Bulge reg ~ ~           ~ 3391 0
23 NAME Galactic Bar reg ~ ~           ~ 894 0

    Equat.    Gal    SGal    Ecl

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2020.07.14-19:43:50

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