J/A+A/584/A88 Barred & unbarred galaxies N, O abundance ratio (Florido+, 2015)
Central enhancement of the nitrogen-to-oxygen abundance ratio in barred
galaxies.
Florido E., Zurita A., Perez I., Perez-Montero E., Coelho P.R.T.,
Gadotti D.A.
<Astron. Astrophys. 584, A88 (2015)>
=2015A&A...584A..88F 2015A&A...584A..88F (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, optical ; Abundances
Keywords: galaxies: evolution - galaxies: abundances - galaxies: bulges -
galaxies: spiral - galaxies: structure - galaxies: ISM
Abstract:
Bar-induced gas inflows towards galaxy centres are recognised as a key
agent for the secular evolution of galaxies. One immediate consequence
of this inflow is the accumulation of gas in the centre of galaxies
where it can form stars and alter the chemical and physical
properties.
Our aim is to study whether the properties of the ionised gas in the
central parts of barred galaxies are altered by the presence of a bar
and whether the change in central properties is related to bar and/or
parent galaxy properties.
We use a sample of nearby face-on disc galaxies with available SDSS
spectra, morphological decomposition, and information on the stellar
population of their bulges, to measure the internal Balmer extinction
from the Hα to Hβ line ratio, star formation rate, and
relevant line ratios to diagnose chemical abundances and gas density.
Description:
The tables contain nebular emission line fluxes for the central region
of 251 barred and 324 unbarred galaxies. The sample contains all
spiral face-on galaxies (axial ratio b/a≥0.9) in the SDSS DR-2,
with stellar masses larger than 1010 the solar mass, redshift
0.02<z<0.07 and 0.07, bulge-to-total luminosity ratio above 0.043, and
signal-to-noise ratio in their corresponding SDSS spectra greater or
equal than 10 (in g-band). See Sect. 2 of the paper and Coelho &
Gadotti (2011ApJ...743L..13C 2011ApJ...743L..13C) for further details about the galaxy
sample.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
barred.dat 175 251 Extinction-corrected emission line fluxes for
the barred galaxies
unbarred.dat 175 324 Extinction-corrected emission line fluxes for
the unbarred galaxies
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Byte-by-byte Description of file: barred.dat unbarred.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Plate SDSS plate used to collect the spectrum
7- 11 I5 --- MJD Modified Julian Date of observation
14- 16 I3 --- Fiber Fiber number
19- 22 I4 --- F3727 Flux of [OII] (3727Å) (1)
25- 28 I4 --- e_F3727 Uncertainty in [OII]
32- 34 I3 --- F4101 Flux of Hdelta (4101Å) (1)
38- 40 I3 --- e_F4101 Uncertainty in Hdelta
44- 46 I3 --- F4340 Flux of Hgamma (4340Å) (1)
50- 52 I3 --- e_F4340 Uncertainty in Hgamma
56- 58 I3 --- F4959 Flux of [OIII] (4959Å) (1)
62- 64 I3 --- e_F4959 Uncertainty in [OIII]
67- 70 I4 --- F5007 Flux of [OIII] (5007Å) (1)
74- 76 I3 --- e_F5007 Uncertainty in [OIII]
80- 82 I3 --- F6300 Flux of [OI] (6300Å) (1)
86- 88 I3 --- e_F6300 Uncertainty in [OI]
92- 94 I3 --- F6548 Flux of [NII] (6548Å) (1)
98-100 I3 --- e_F6548 Uncertainty in [NII]
104-106 I3 --- F6563 Flux of Halpha (6563Å) (1)
110-112 I3 --- e_F6563 Uncertainty in Halpha
116-118 I3 --- F6583 Flux of [NII] (6583Å) (1)
122-124 I3 --- e_F6583 Uncertainty in [NII]
128-130 I3 --- F6716 Flux of [SII] (6716Å) (1)
134-136 I3 --- e_F6716 Uncertainty in [SII]
140-142 I3 --- F6731 Flux of [SII] (6731Å) (1)
146-148 I3 --- e_F6731 Uncertainty in [SII]
151-154 I4 10-20W/m2 F4861 Flux of Hbeta (4861Å) (2)
158-160 I3 10-20W/m2 e_F4861 Uncertainty in Hbeta
163-169 F7.2 --- c ?=-999 Balmer extinction at Hbeta (3)
172-175 F4.2 --- e_c Uncertainty in Balmer extinction
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Note (1): The emission line fluxes are given in units of Hbeta=100.
Note (2): Extinction corrected flux of Hbeta within the SDSS fiber,
in 10-17erg/cm2/s.
Note (3): The Balmer extinction at Hbeta is set to:
-999.0 when the Hbeta emission line can not be measured in the original
spectra, and
0.00 when the uncorrected Halpha to Hbeta emission line ratio is lower
than 2.86 (Ha/Hb<2.86).
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Acknowledgements:
Estrella Florido, estrella(at)ugr.es
Almudena Zurita, azurita(at)ugr.es
(End) E. Florido [UGR], Patricia Vannier [CDS] 25-Nov-2015