J/A+A/595/A62 CALIFA galaxies O/H and N/O slopes (Perez-Montero+, 2016)
The dependence of oxygen and nitrogen abundances on stellar mass from the
CALIFA survey.
Perez-Montero E., Garcia-Benito R., Vilchez J.M., Sanchez S.F., Kehrig C.,
Husemann B., Duarte Puertas S., Iglesias-Paramo J., Galbany L., Molla M.,
Walcher C.J., Ascasibar Y., Gonzalez Delgado R.M., Marino R.A., Masegosa J.,
Perez E., Rosales-Ortega F.F., Sanchez-Blazquez P., Bland-Hawthorn J.,
Bomans D., Lopez-Sanchez A.R., Ziegler B., (the CALIFA Collaboration)
<Astron. Astrophys. 595, A62 (2016)>
=2016A&A...595A..62P 2016A&A...595A..62P (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Galaxy catalogs ; Abundances
Keywords: ISM: abundances - galaxies: star formation - galaxies: abundances -
galaxies: evolution
Abstract:
The study of the integrated properties of star-forming galaxies is
central to understand their formation and evolution. Some of these
properties are extensive and therefore their analysis require totally
covering and spatially resolved observations. Among these properties,
metallicity can be defined in spiral discs by means of integral field
spectroscopy (IFS) of individual HII regions. The simultaneous
analysis of the abundances of primary elements, as oxygen, and
secondary, as nitrogen, also provides clues about the star formation
history and the processes that shape the build-up of spiral discs.
Our main aim is to analyse simultaneously O/H and N/O abundance ratios
in HII regions in different radial positions of the discs in a
large sample of spiral galaxies to obtain the slopes and the
characteristic abundance ratios that can be related to their
integrated properties.
We analysed the optical spectra of individual selected HII regions
extracted from a sample of 350 spiral galaxies of the CALIFA survey.
We calculated total O/H abundances and, for the first time, N/O ratios
using the semi-empirical routine HII-CHI-MISTRY, which, according to
Perez-Montero (2014MNRAS.441.2663P 2014MNRAS.441.2663P), is consistent with the direct
method and reduces the uncertainty in the O/H derivation using [NII]
lines owing to the dispersion in the O/H-N/O relation. Then we
performed linear fittings to the abundances as a function of the
de-projected galactocentric distances.
Description:
The CALIFA mother sample consists of 939 galaxies, but for this work
we used a sample of 350 objects observed with the gratings V500 and
V1200. The observed wavelength range and spectroscopic resolution
(3745-7500Å, λ/Δλ~=850, for the
low-resolution setup and 3650-4800Å,
λ/Δλ~=1500, for the high resolution setup) are
more than sufficient to explore the most prominent ionised gas
emission lines, from [OII]λ3727 to [SII]λ6731, on the
one hand, and to deblend and subtract the underlying stellar
population, on the other (e.g. Sanchez et al., 2012A&A...538A...8S 2012A&A...538A...8S;
Kehrig et al., 2012A&A...540A..11K 2012A&A...540A..11K; Cid Fernandes et al.,
2013A&A...557A..86C 2013A&A...557A..86C).
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 83 201 List of the analysed CALIFA galaxies with their
effective radii, inclinations, and the number
of HII regions used to calculate their O/H and
N/O slopes and the values at the effective
radius of the gradients
--------------------------------------------------------------------------------
See also:
J/A+A/576/A135 : CALIFA DR2 (Garcia-Benito+, 2015)
J/A+A/587/A70 : CALIFA face-on spiral galaxies oxygen
(Sanchez-Menguiano+, 2016)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 14 A14 --- Galaxy Galaxy name
16- 19 F4.1 kpc Re Effective radii
21- 25 F5.1 kpc e_Re rms uncertainty on effective radii
27- 28 I2 deg i Inclinations
30- 32 I3 --- nHII Number of HII regions
34- 39 F6.3 --- aOH O/H slope (in dex/Re unit)
41- 45 F5.3 --- e_aOH rms O/H slope (in dex/Re unit)
47- 51 F5.3 --- tOH O/H values at the effective radius of the
gradients
53- 57 F5.3 --- e_tOH rms O/H values at the effective radius of the
gradients
59- 64 F6.3 --- aNO N/O slope (in dex/Re unit)
66- 70 F5.3 --- e_aNO rms N/O slope (in dex/Re unit)
72- 77 F6.3 --- tNO N/O values at the effective radius of the
gradients
79- 83 F5.3 --- e_tNO rms N/O values at the effective radius of the
gradients
--------------------------------------------------------------------------------
Acknowledgements:
Enrique Perez-Montero, epm(at)iaa.es
(End) Patricia Vannier [CDS] 05-Aug-2016