2005A&A...437..837D


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.05CET03:12:04

2005A&A...437..837D - Astronomy and Astrophysics, volume 437, 837-847 (2005/7-3)

Abundance gradients in a sample of barred spiral galaxies.

DORS O.L.Jr and COPETTI M.V.F.

Abstract (from CDS):

We used photoionization models in order to reproduce the observed gradients of emission-line ratios for HII regions located in the normal spiral galaxy M101 and in three barred spiral galaxies, namely NGC1365, NGC925, and NGC1073. The behavior of the following nebular parameters across the disk of these galaxies was determined: temperature of the ionizing star (Teff), ionization parameter (U), and the abundance ratios O/H, N/O, and S/O. Our O/H predictions were found to be consistent with some empirical abundance determinations, but are overestimated by a factor of 0.1-0.4dex when compared to the direct abundance determinations. NGC1073 seems to be overabundant in nitrogen compared to other spiral galaxies. No gradient of S/O was found in the studied galaxies, and we derived a positive Teff gradient of ΔTeff/ΔR=(400±112)K/kpc and U ranging from -3.0 to -2.3. The N/O vs. O/H diagram in general is consistent with chemical evolution models that assume that the nitrogen synthesis has both a primary and a secondary component compared to oxygen. However, a very strong N/O dependence on the O/H at high abundance was found.

Abstract Copyright:

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

Simbad objects: 11

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Number of rows : 11

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NGC 925 H2G 02 27 16.913 +33 34 43.97   10.69 10.12 9.55   ~ 712 1
2 NGC 1073 EmG 02 43 40.598 +01 22 33.13   11.3   11.3 11.8 ~ 307 0
3 NGC 1365 Sy1 03 33 36.458 -36 08 26.37 10.48 10.08 9.63 8.79 9.7 ~ 1562 2
4 M 51 GiP 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 3892 4
5 CCM 10 HII 13 29 59.521 +47 13 57.76           ~ 27 0
6 [HBS84] 29 HII 14 02 54.200 +54 22 25.56           ~ 35 0
7 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 2602 2
8 [H69] NGC 5457 40 PoG 14 03 31.300 +54 21 05.81           ~ 39 0
9 NGC 5461 HII 14 03 40.96 +54 19 02.4           ~ 178 0
10 NGC 5471 EmG 14 04 28.627 +54 23 52.84           ~ 232 1
11 NGC 6153 PN 16 31 30.5709136856 -40 15 12.646146874   10.7 15.55     ~ 290 0

    Equat.    Gal    SGal    Ecl

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2021.03.05-03:12:04

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