2013ApJ...766...17L

Query : 2013ApJ...766...17L

2013ApJ...766...17L - Astrophys. J., 766, 17 (2013/March-3)

Testing for azimuthal abundance gradients in M101.

LI Y., BRESOLIN F. and KENNICUTT R.C.Jr

Abstract (from CDS):

New optical spectra of 28 H II regions in the M101 disk have been obtained, yielding 10 new detections of the [O III] λ4363 auroral line. The oxygen abundance gradient measured from these data, combined with previous observations, displays a local scatter of 0.15±0.03 dex along an arc in the west side of the galaxy, compared with a smaller scatter of 0.08±0.01 dex in the rest of the disk. One of the H II regions in our sample (H27) has a significantly lower oxygen abundance than surrounding nebulae at a similar galactocentric distance, while an additional, relatively nearby one (H128) was already known to have a high oxygen abundance for its position in the galaxy. These results represent marginal evidence for the existence of moderate deviations from chemical abundance homogeneity in the interstellar medium of M101. Using a variety of strong-line abundance indicators, we find no evidence for significant large-scale azimuthal variations of the oxygen abundance across the whole disk of the galaxy.

Abstract Copyright: ∼

Journal keyword(s): galaxies: abundances - galaxies: individual: M101 - galaxies: ISM - ISM: abundances

Simbad objects: 55

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Number of rows : 55
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
2 NGC 300 GiG 00 54 53.4465638304 -37 41 03.168402396 8.83 8.69 8.13 7.46   ~ 1614 2
3 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 6226 1
4 M 74 G 01 36 41.7451236624 +15 47 01.107512304 10.52 10.00 9.46 9.16   ~ 1934 1
5 Feige 34 HS* 10 39 36.7358839104 +43 06 09.212615280 9.613 10.91 11.14 11.319 11.464 sdOp 731 0
6 M 91 LIN 12 35 26.4446761320 +14 29 46.760333748   14.63 13.57     ~ 639 0
7 BD+18 2647 HS* 12 41 51.7899961800 +17 31 19.750566756 10.261 11.70 11.63 11.969 12.159 sdOpec 185 1
8 SDH 179 HII 14 02 17.400 +54 20 54.75           ~ 6 0
9 HGGK 37 HII 14 02 17.6 +54 22 33           ~ 5 0
10 HGGK 41 HII 14 02 17.9 +54 18 35           ~ 3 0
11 [SIP2007] 12 HII 14 02 20.1558057601 +54 20 02.034335543           ~ 16 0
12 HGGK 70 HII 14 02 20.2 +54 17 48           ~ 8 0
13 HGGK 68 HII 14 02 20.2 +54 23 16           ~ 3 0
14 HGGK 59 HII 14 02 20.400 +54 19 59.55           ~ 5 0
15 HGGK 71 HII 14 02 20.700 +54 17 43.47           ~ 8 0
16 HGGK 79 HII 14 02 21.9 +54 21 59           ~ 4 0
17 HGGK 103 HII 14 02 25.600 +54 17 29.09           ~ 5 0
18 HGGK 120 HII 14 02 26.7 +54 19 31           ~ 4 0
19 HGGK 125 HII 14 02 27.6 +54 27 08           ~ 3 0
20 HGGK 128 HII 14 02 27.800 +54 16 25.34           ~ 16 0
21 NGC 5447 HII 14 02 28.0 +54 16 34           ~ 73 0
22 HGGK 140 HII 14 02 29.300 +54 19 50.65           ~ 9 0
23 NGC 5450 HII 14 02 29.4 +54 16 17           ~ 20 0
24 HGGK 149 HII 14 02 30.500 +54 16 09.89           ~ 15 0
25 HGGK 188 HII 14 02 39.2 +54 29 03           ~ 3 0
26 HGGK 219 HII 14 02 46.600 +54 14 49.40           ~ 8 0
27 HGGK 237 HII 14 02 48.700 +54 17 55.12           ~ 8 0
28 HGGK 253 HII 14 02 49.2 +54 29 10           ~ 3 0
29 HGGK 260 HII 14 02 49.600 +54 17 42.25           ~ 5 0
30 HGGK 321 HII 14 02 53.700 +54 15 22.03           ~ 5 0
31 HGGK 370 HII 14 02 57.1 +54 15 54           ~ 3 0
32 NAME M101 Group GrG 14 03 +54.3           ~ 112 1
33 NGC 5455 H2G 14 03 01.17 +54 14 29.4           ~ 105 0
34 HGGK 493 HII 14 03 03.900 +54 21 25.29           ~ 10 0
35 [S71] M 101 2 HII 14 03 04.3 +54 19 28           ~ 13 0
36 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 3138 2
37 HGGK 681 HII 14 03 12.600 +54 35 41.83           ~ 15 0
38 HGGK 682 HII 14 03 13.7 +54 35 42           ~ 2 0
39 HGGK 972 HII 14 03 28.400 +54 21 26.49           ~ 10 0
40 [H69] NGC 5457 40 PoG 14 03 31.300 +54 21 05.81           ~ 43 0
41 NGC 5461 HII 14 03 40.96 +54 19 02.4           ~ 195 0
42 HGGK 1118 HII 14 03 42.3 +54 29 55           ~ 4 0
43 HGGK 1121 HII 14 03 43.3 +54 29 20           ~ 3 0
44 HGGK 1137 HII 14 03 46.800 +54 28 39.70           ~ 5 0
45 HGGK 1146 HII 14 03 48.700 +54 28 10.10           ~ 6 0
46 HGGK 1148 HII 14 03 49.700 +54 27 51.46           ~ 5 0
47 SDH 323 HII 14 03 50.1 +54 38 05           ~ 9 0
48 HGGK 1151 HII 14 03 50.600 +54 27 36.60           ~ 5 0
49 HGGK 1159 HII 14 03 51.2 +54 21 51           ~ 14 0
50 HGGK 1170 HII 14 03 53.000 +54 22 06.80           ~ 18 0
51 NGC 5462 HII 14 03 53.0997760440 +54 22 06.493306404           ~ 85 0
52 HGGK 1176 HII 14 03 53.3 +54 22 09           ~ 14 0
53 NGC 5471 EmG 14 04 28.627 +54 23 52.84           ~ 250 1
54 HGGK 1262 HII 14 04 49.8 +54 28 14           ~ 3 0
55 BD+28 4211 HS* 21 51 11.0221915656 +28 51 50.367627468 8.922 10.25 10.58 10.656 10.831 sdO2VIIIHe5 837 0

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