J/MNRAS/462/2715 Oxygen abundance maps of CALIFA galaxies (Zinchenko+, 2016)
Oxygen abundance maps of CALIFA galaxies.
Zinchenko I.A., Pilyugin L.S., Grebel E.K., Sanchez S.F., Vilchez J.M.
<Mon. Not. R. Astron. Soc., 462, 2715-2733 (2016)>
=2016MNRAS.462.2715Z 2016MNRAS.462.2715Z (SIMBAD/NED BibCode)
ADC_Keywords: Galaxy catalogs ; H II regions ; Abundances ; Morphology
Keywords: ISM: abundances - H II regions - galaxies: abundances
Abstract:
We construct maps of the oxygen abundance distribution across the
discs of 88 galaxies using Calar Alto Legacy Integral Field Area
survey (CALIFA) Data Release 2 (DR2) spectra. The position of the
centre of a galaxy (coordinates on the plate) was also taken from the
CALIFA DR2. The galaxy inclination, the position angle of the major
axis, and the optical radius were determined from the analysis of the
surface brightnesses in the Sloan Digital Sky Survey (SDSS) g and r
bands of the photometric maps of SDSS Data Release 9. We explore the
global azimuthal abundance asymmetry in the discs of the CALIFA
galaxies and the presence of a break in the radial oxygen abundance
distribution. We found that there is no significant global azimuthal
asymmetry for our sample of galaxies, i.e. the asymmetry is small,
usually lower than 0.05dex. The scatter in oxygen abundances around
the abundance gradient has a comparable value, ≲0.05dex. A
significant (possibly dominant) fraction of the asymmetry can be
attributed to the uncertainties in the geometrical parameters of these
galaxies. There is evidence for a flattening of the radial abundance
gradient in the central part of 18 galaxies. We also estimated the
geometric parameters (coordinates of the centre, the galaxy
inclination and the position angle of the major axis) of our galaxies
from the analysis of the abundance map. The photometry-map-based and
the abundance-map-based geometrical parameters are relatively close to
each other for the majority of the galaxies but the discrepancy is
large for a few galaxies with a flat radial abundance gradient.
Description:
We used publicly available spectra from the integral field
spectroscopic CALIFA survey Data Release 2 (DR2; Sanchez et al.,
2012A&A...538A...8S 2012A&A...538A...8S; Garcia-Benito et al., 2014, Cat. J/A+A/576/A135;
Walcher et al., 2014A&A...569A...1W 2014A&A...569A...1W) based on observations with the
Potsdam Multi-Aperture Spectrophotometer (PMAS)/PPAK integral field
spectrophotometer mounted on the Calar Alto 3.5-m telescope.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 36 88 The adopted general properties of our sample of
the CALIFA galaxies
tablea2.dat 104 88 The obtained properties of the oxygen abundance
distributions in the discs of the sample of
CALIFA galaxies with available abundance maps
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See also:
J/A+A/576/A135 : CALIFA DR2 (Garcia-Benito+, 2015)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Galaxy name (1)
11- 15 A5 --- MType Morphological type
17- 19 F3.1 --- TType Morphological type code t from LEDA
21- 24 F4.2 arcmin R25 Isophotal radius R25 in arcmin (2)
26- 30 F5.2 kpc R25kpc Isophotal radius R25 in kpc (3)
32- 36 F5.1 Mpc Dist NED distance using flow corrections for Virgo,
the Great Attractor, and Shapley
Supercluster infall
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Note (1): We have used the most widely used name for each galaxy. The galaxies
are listed in the order of the name category, with the following categories
in descending order:
NGC - New General Catalogue
IC - Index Catalogue
UGC - Uppsala General Catalog of Galaxies
PGC - Catalogue of Principal Galaxies
Note (2): We determined the isophotal radius from the photometric maps in the
SDSS g and r bands.
Note (3): isophotal radius estimated from R25 and Dist.
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Byte-by-byte Description of file: tablea2.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Galaxy name
11- 12 I2 --- X0 X0 position in spaxel, Case A (3)
14- 15 I2 --- Y0 Y0 position in spaxel, Case A (3)
17- 18 I2 arcmin Incl Inclination, Case A (3)
20- 22 I3 arcmin PA Position angle of the major axis, Case A (3)
24- 27 F4.2 --- (O/H)0 Extrapolated central 12+log(O/H) oxygen
abundance, Case A (3)
29- 34 F6.3 --- (O/H)gr Radial oxygen abundance gradient expressed in
terms of dex/R25, Case A (3)
36- 40 F5.3 --- s_(O/H) Scatter of oxygen abundances around the general
radial oxygen abundance trend within the
optical R25 radius of a galaxy in dex,
Case A (3)
42- 46 F5.3 --- Amp Maximum azimuthal asymmetry amplitude in dex,
Case A (3) (4)
48- 50 I3 deg Angle Maximum azimuthal asymmetry angle,
Case A (3) (4)
52- 54 F3.1 --- Rbreak ? Break radius if a bend in the radial
abundance distribution exists in R25 unit,
Case A (3)
56- 59 I4 --- Nsp Number of spectra, Case A (3)
61- 64 F4.1 --- X0C X0 position in spaxel, Case C (5)
66- 69 F4.1 --- Y0C Y0 position in spaxel, Case C (5)
71- 72 I2 arcmin InclC Inclination, Case C (5)
74- 76 I3 arcmin PAC Position angle of the major axis, Case C (5)
78- 81 F4.2 --- (O/H)0C Extrapolated central 12+log(O/H) oxygen
abundance, Case C (5)
83- 88 F6.3 --- (O/H)grC Radial oxygen abundance gradient expressed in
terms of dex/R25, Case C (5)
90- 94 F5.3 --- s_(O/H)C Scatter of oxygen abundances around the general
radial oxygen abundance trend within the
optical R25 radius of a galaxy in dex,
Case C (5)
96-100 F5.3 --- AmpC Maximum azimuthal asymmetry amplitude in dex,
Case C (5) (4)
102-104 I3 deg AngleC Maximum azimuthal asymmetry angle,
Case C (5) (4)
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Note (3): geometrical parameters of the galaxies obtained from the analysis of
the photometric map and the properties of the abundance distribution in the
disc of the galaxies determined with deprojected galactocentric distances of
spaxels for those geometrical parameters (case A in the text and figures).
Note (4): global azimuthal asymmetry (maximum difference between the arithmetic
means of the deviations from the O/H-Rg relation for the opposite semicircle
sectors) and the position of the dividing line (see panels d in Fig. 4).
Note (5): geometrical parameters of the galaxies obtained from the analysis of
the abundance map and the properties of the abundance distribution in the disc
of the galaxy determined with deprojected galactocentric distances of spaxels
for those geometrical parameters (case C in the text).
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 14-Feb-2018