2014A&A...567A..88S


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.19CET18:14:29

2014A&A...567A..88S - Astronomy and Astrophysics, volume 567A, 88-88 (2014/7-1)

The radial metallicity gradient and the history of elemental enrichment in M 81 through emission-line probes.

STANGHELLINI L., MAGRINI L., CASASOLA V. and VILLAVER E.

Abstract (from CDS):

We present a new set of weak-line abundances of HII regions in M81, which are based on Gemini Multi-Object Spectrograph (GMOS) observations. The aim is to derive plasma and abundance analysis for a sizable set of emission-line targets to study the galactic chemical contents in the framework of galactic metallicity gradients. We used the weak-line abundance approach by deriving electron density and temperatures for several HII regions in M81. Our gradient analysis is based on oxygen abundances. Together with a set of HII region abundances determined similarly by us with Multi-Mirror Telescope (MMT) spectra, the new data yield a radial oxygen gradient of -0.088±0.013dex/kpc, which is steeper than the metallicity gradient obtained for planetary nebulae (-0.044±0.007dex/kpc). This result could be interpreted as gradient evolution with time: Models of galactic evolution with inside-out disk formation associated to pre-enriched gas infall would produce such a difference in gradients, although stellar migration effects would also induce a difference in the metallicity gradients between the old and young populations. By comparing the M81 metallicity gradients with those of other spiral galaxies, which were all consistently derived from weak-line analysis, we can infer that a similar gradient difference is common among spirals. The metallicity gradient slopes for HII regions and PNe seem to be steeper in M81 than in other galactic disks, which is probably because M81 belongs to a galaxy group. We also found that M81 has experienced an average oxygen enrichment of 0.14±0.08dex in the spatial domain defined by the observations. Our data are compatible with a break in the radial oxygen gradient slope around R25 as inferred by other authors both in M81 and in other galaxies.

Abstract Copyright:

Journal keyword(s): Galaxy: abundances - galaxies: evolution - galaxies: individual: M81 - HII regions

VizieR on-line data: <Available at CDS (J/A+A/567/A88): table2.dat table3.dat table4.dat>

Status in Simbad:  will not be processed

Simbad objects: 34

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Number of rows : 34

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 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 10585 1
2 NGC 300 GiG 00 54 53.4460065856 -37 41 03.182962667 8.83 8.69 8.13 7.46   ~ 1272 2
3 M 33 GiG 01 33 50.904 +30 39 35.79 6.17 6.27 5.72     ~ 5027 1
4 NGC 1512 GiP 04 03 54.281 -43 20 55.86 11.30 11.43 10.54 10.37   ~ 312 1
5 BD+52 913 WD* 05 05 30.6182785658 +52 49 51.920797126 10.25 11.44 11.69 11.93 12.108 DA.8 959 0
6 [PR95] 50475 ? 09 54 47.827 +69 03 33.05   20.84 20.89     ~ 2 0
7 PSK 45 HII 09 54 48.14 +69 05 05.7           ~ 3 0
8 PSK 47 HII 09 54 48.62 +69 08 07.9           ~ 3 0
9 PSK 63 HII 09 54 51.32 +69 04 24.2           ~ 3 0
10 PSK 87 HII 09 54 55.41 +69 07 16.2           ~ 3 0
11 [PR95] 51109 ? 09 54 56.561 +69 10 32.47   20.2 20.26     ~ 2 0
12 PSK 124 HII 09 55 03.49 +69 05 58.1           ~ 3 0
13 PSK 122 HII 09 55 03.56 +69 11 26.0           ~ 3 0
14 PSK 125 HII 09 55 03.70 +69 06 25.4           ~ 3 0
15 PSK 128 HII 09 55 04.48 +69 06 51.7           ~ 3 0
16 [PR95] 50451 ? 09 55 08.464 +69 03 18.93   21.38 21.16     ~ 2 0
17 [IW2001] P30 SNR 09 55 10.602 +69 08 43.17     22.86     ~ 7 0
18 [MPC2001] 21 PN 09 55 12.49 +69 05 12.8           ~ 3 0
19 [PR95] 51114 * 09 55 12.686 +69 10 50.88   20.503 20.305     B9 3 0
20 [IW2001] P32 X 09 55 14.384 +69 12 35.51           ~ 4 0
21 PSK 171 HII 09 55 15.45 +69 08 14.4           ~ 3 0
22 [MPC2001] 33 PN? 09 55 15.96 +69 13 31.7           ~ 3 0
23 PSK 185 HII 09 55 19.06 +69 10 08.7           ~ 3 0
24 PSK 186 HII 09 55 19.59 +69 09 28.2           ~ 3 0
25 PSK 189 SNR 09 55 19.686 +69 07 33.06     22.05     ~ 8 0
26 [PR95] 50476 ? 09 55 21.503 +69 03 32.71   21.46 20.28     ~ 2 0
27 [PR95] 50645 ? 09 55 25.029 +69 05 03.04   22.24 20.86     ~ 2 0
28 PSK 213 HII 09 55 26.01 +69 11 58.9           ~ 5 0
29 M 81 Sy2 09 55 33.17306143 +69 03 55.0609270   7.89 6.94     ~ 3893 5
30 PSK 246 HII 09 55 37.20 +69 09 08.4           ~ 3 0
31 PSK 249 HII 09 55 37.61 +69 12 03.6           ~ 5 0
32 PSK 279 HII 09 55 46.08 +69 11 01.5           ~ 3 0
33 LEDA 28731 G 09 57 03.0 +68 35 31   15.17       ~ 93 1
34 NGC 3621 AGN 11 18 16.300 -32 48 45.36 10.10 9.44 9.56 8.07 10.1 ~ 476 3

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2019.11.19-18:14:29

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