2017MNRAS.471..987E


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.16CEST10:51:35

2017MNRAS.471..987E - Mon. Not. R. Astron. Soc., 471, 987-1004 (2017/October-2)

The radial abundance gradient of oxygen towards the Galactic anti-centre.

ESTEBAN C., FANG X., GARCIA-ROJAS J. and TORIBIO SAN CIPRIANO L.

Abstract (from CDS):

We present deep optical spectroscopy of eight H II regions located in the anti-centre of the Milky Way. The spectra were obtained at the 10.4 m GTC and 8.2 m VLT. We determined Te([N II]) for all objects and Te([O III]) for six of them. We also included in our analysis an additional sample of 13 inner-disc Galactic H II regions from the literature that have excellent Te determinations. We adopted the same methodology and atomic data set to determine the physical conditions and ionic abundances for both samples. We also detected the C II and O II optical recombination lines in Sh 2-100, which enables the determination of the abundance discrepancy factor for this object. We found that the slopes of the radial oxygen gradients defined by the H II regions from R25 (=11.5 kpc) to 17 kpc and those within R25 are similar within the uncertainties, indicating the absence of flattening in the radial oxygen gradient in the outer Milky Way. In general, we found that the scatter of the O/H ratios of H II regions is not substantially larger than the observational uncertainties. The largest possible local inhomogeneities of the oxygen abundances are of the order of 0.1 dex. We also found positive radial gradients in Te([O III]) and Te([N II]) across the Galactic disc. The shapes of these temperature gradients are similar and also consistent with the absence of flattening of the metallicity distribution in the outer Galactic disc.

Abstract Copyright: © 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): ISM: abundances - H ii regions - Galaxy: abundances - Galaxy: disc - Galaxy: evolution - Galaxy: evolution

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR.

Simbad objects: 31

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Number of rows : 31

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 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9757 1
2 NGC 300 GiG 00 54 53.4460065856 -37 41 03.182962667 8.83 8.69 8.13 7.46   ~ 1354 2
3 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5905 1
4 NGC 1512 GiP 04 03 54.281 -43 20 55.86 11.30 11.43 10.54 10.37   ~ 330 1
5 SH 2-209 HII 04 11 06.7 +51 09 44           ~ 93 0
6 SH 2-212 HII 04 40 36.50 +50 27 44.3           ~ 93 2
7 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15289 1
8 M 42 HII 05 35 17.3 -05 23 28           ~ 3787 0
9 HD 49798 HXB 06 48 04.7000758397 -44 18 58.432035331 6.758 8.017 8.287 8.391 8.543 sdO6 288 0
10 IC 466 HII 07 08 37 -04 18.8           ~ 46 0
11 HD 56925 WR* 07 18 29.1313276537 -13 13 01.513156589 11.21 11.74 11.56 11.40   WN4b 162 0
12 NGC 2359 HII 07 18 30.000 -13 13 36.00           ~ 161 0
13 NGC 2467 HII 07 52 18 -26 25.7           ~ 176 1
14 NGC 2579 OpC 08 20 55.3 -36 13 23           ~ 97 4
15 NGC 3576 HII 11 11 49.8 -61 18 14           ~ 229 2
16 NGC 3603 OpC 11 15 18.6 -61 15 26           ~ 975 1
17 NGC 3621 AGN 11 18 16.300 -32 48 45.36 10.10 9.44 9.56 8.07 10.1 ~ 502 3
18 M 83 SBG 13 37 00.919 -29 51 56.74 8.85 8.11 7.52 7.21   ~ 2297 2
19 M 20 OpC 18 02 42 -22 58.3           ~ 404 1
20 M 8 HII 18 03 37 -24 23.2           ~ 564 1
21 M 16 OpC 18 18 48 -13 48.4   6.58 6.0     ~ 959 2
22 NGC 6618 OpC 18 20 47 -16 10.3           ~ 1514 0
23 SH 2-83 HII 19 24 30 +20 47.6           ~ 25 0
24 LBN 070.24+01.53 HII 20 01 44.7 +33 31 14           ~ 35 1
25 LBN 096.23+02.55 HII 21 28 42 +54 37.0           ~ 48 0
26 SH 2-128 HII 21 32 10.393 +55 52 42.36   10.8       ~ 164 3
27 IC 5146 OpC 21 53 24 +47 16.0           ~ 400 2
28 LBN 102.79-00.92 HII 22 19 09.0 +56 04 45           ~ 102 0
29 IC 1470 HII 23 05 09.9 +60 14 31   11.5       ~ 168 1
30 NGC 7635 HII 23 20 48.3 +61 12 06           ~ 162 2
31 NGC 7793 GiG 23 57 49.7533807411 -32 35 27.708304655 10.26 9.74 9.28 9.06 9.7 ~ 964 2

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2021.04.16-10:51:35

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