2011ApJ...729...56B

Query : 2011ApJ...729...56B

2011ApJ...729...56B - Astrophys. J., 729, 56 (2011/March-1)

Revisiting the abundance gradient in the maser host galaxy NGC 4258.

BRESOLIN F.

Abstract (from CDS):

New spectroscopic observations of 36 H II regions in NGC 4258 obtained with the Gemini telescope are combined with existing data from the literature to measure the radial oxygen abundance gradient in this galaxy. The [O III]λ4363 auroral line was detected in four of the outermost targets (17-22 kpc from the galaxy center), allowing a determination of the electron temperature Te of the ionized gas. From the use of different calibrations of the R 23 abundance indicator, an oxygen abundance gradient of approximately -0.012 ±0.002 dex/kpc is derived. Such a shallow gradient, combined with the difference in the distance moduli measured from the Cepheid period-luminosity relation by Macri et al. between two distinct fields in NGC 4258, would yield an unrealistically strong effect of metallicity on the Cepheid distances. This strengthens the suggestion that systematic biases might affect the Cepheid distance of the outer field. Evidence for a similar effect in the differential study of M33 by Scowcroft et al. is presented. A revision of the transformation between strong-line and Te-based abundances in Cepheid-host galaxies is discussed. In the Te abundance scale, the oxygen abundance of the inner field of NGC 4258 is found to be comparable with the LMC value.

Abstract Copyright: ∼

Journal keyword(s): galaxies: abundances - galaxies: individual: NGC 4258 - galaxies: ISM

Nomenclature: Fig. 1, Table 2: [B2011] NN (Nos 1-36).

Simbad objects: 107

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Number of rows : 107
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 MCG-03-01-015 G 00 01 57.9 -15 27 50   11.50 11.10 10.93   ~ 782 2
2 NGC 55 rG 00 14 53.602 -39 11 47.86 8.54 8.58 7.87 7.84   ~ 828 2
3 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
4 BA 1-671 HII 00 46 34.52 +42 11 33.7           ~ 22 1
5 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
6 NGC 300 GiG 00 54 53.4465638304 -37 41 03.168402396 8.83 8.69 8.13 7.46   ~ 1614 2
7 IC 1613 GiC 01 04 48.4071 +02 07 10.185   10.42 10.01 9.77   ~ 1316 2
8 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 6226 1
9 NGC 925 H2G 02 27 16.913 +33 34 43.97   10.69 10.12 9.55   ~ 818 1
10 NGC 1309 GiG 03 22 06.5548977432 -15 23 59.791692912   12.08   12.5 11.7 ~ 246 1
11 NGC 1326A AG? 03 25 08.50 -36 21 50.2   13.80   12.91 13.7 ~ 103 0
12 NGC 1365 Sy1 03 33 36.458 -36 08 26.37 10.48 10.08 9.63 8.79 9.7 ~ 1987 2
13 NGC 1425 EmG 03 42 11.4831633240 -29 53 36.186684252   11.61   11.6 10.9 ~ 209 0
14 NGC 1637 Sy2 04 41 28.1926876152 -02 51 28.667815488   11.4   11.0 11.3 ~ 444 0
15 NGC 1741 EmG 05 01 38.3 -04 15 25   13.7   13.02 13.6 ~ 273 0
16 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
17 M 42 HII 05 35 16.8 -05 23 15           ~ 4411 0
18 NAME Ori I As* 05 38 -02.8           ~ 653 0
19 RMC 136 Cl* 05 38 42.396 -69 06 03.36   5.81 5.40     ~ 2236 2
20 NGC 2090 GiG 05 47 01.8557074752 -34 15 01.679264784 12.17 11.70 11.20 10.43 11.0 ~ 206 1
21 NGC 2363 AG? 07 28 29.59 +69 11 34.3   15.5       ~ 262 1
22 NGC 2363A HII 07 28 42.8 +69 11 21           ~ 588 3
23 NGC 2403 AGN 07 36 51.3381434280 +65 36 09.650825640 9.31 8.84 8.38 8.19   ~ 1887 1
24 NGC 2541 GiG 08 14 40.1160678912 +49 03 42.021679932 12.03 12.26 11.80     ~ 333 1
25 NGC 2841 LIN 09 22 02.6778711696 +50 58 35.737082868 10.43 10.09 9.22     ~ 1113 1
26 NGC 3021 GiG 09 50 57.1456156056 +33 33 12.934404072   12.6       ~ 208 0
27 M 81 Sy2 09 55 33.1726556496 +69 03 55.062505368   7.89 6.94     ~ 4725 3
28 Z 36-12 H2G 10 00 00.8217342072 +05 20 09.533389560 12.77 12.25 11.89 11.71   ~ 569 0
29 NGC 3109 AG? 10 03 06.877 -26 09 34.46 11.10 10.42 10.04 9.91   ~ 825 2
30 MCG-01-26-030 H2G 10 11 00.5 -04 41 30 12.48 12.13 11.93 11.78   ~ 789 2
31 NGC 3198 EmG 10 19 54.990 +45 32 58.88 10.83 10.87 10.33     ~ 946 1
32 NGC 3319 SyG 10 39 09.533 +41 41 12.74   11.48 11.07     ~ 325 1
33 Feige 34 HS* 10 39 36.7358839104 +43 06 09.212615280 9.613 10.91 11.14 11.319 11.464 sdOp 731 0
34 M 95 GiP 10 43 57.7313485800 +11 42 13.301191332 10.71 10.51 9.73 9.48   ~ 1238 2
35 M 96 GiP 10 46 45.744 +11 49 11.78 10.42 10.15 9.25 8.99   ~ 862 1
36 NGC 3370 GiG 10 47 04.0734572856 +17 16 25.315359780   12.4       ~ 272 1
37 NGC 3621 Sy2 11 18 16.300 -32 48 45.36 10.10 9.44 9.56 8.07 10.1 ~ 661 3
38 M 66 AGN 11 20 15.0 +12 59 29 9.85 9.65 8.92     ~ 1509 4
39 NGC 3982 Sy2 11 56 28.1445516072 +55 07 30.859586652   12.20 11.70 11.18   ~ 588 1
40 [CPH93] 5Na HII 12 18 26.791 +47 21 09.23           ~ 4 0
41 [BKG99] NGC 4258 2 HII 12 18 43.814 +47 17 32.21           ~ 2 0
42 [CPH93] 3C HII 12 18 43.86 +47 17 25.7           ~ 2 0
43 [B2011] 4 HII 12 18 48.52 +47 21 24.8           ~ 2 0
44 [B2011] 5 HII 12 18 49.39 +47 21 08.2           ~ 1 0
45 [B2011] 13 HII 12 18 49.560 +47 19 20.76           ~ 3 0
46 [B2011] 6 HII 12 18 51.05 +47 20 53.3           ~ 1 0
47 [ZKH94] NGC 4258 9 HII 12 18 53.062 +47 22 51.23           ~ 1 0
48 [B2011] 1 HII 12 18 53.31 +47 22 35.5           ~ 1 0
49 [B2011] 7 HII 12 18 54.13 +47 20 50.3           ~ 1 0
50 [B2011] 2 HII 12 18 55.26 +47 22 09.5           ~ 1 0
51 [B2011] 8 HII 12 18 55.330 +47 20 35.41           ~ 4 0
52 [B2011] 3 HII 12 18 55.69 +47 21 54.3           ~ 1 0
53 [CPH93] 38C HII 12 18 55.87 +47 18 18.7           ~ 2 0
54 [B2011] 9 HII 12 18 55.94 +47 20 25.5           ~ 3 0
55 [CPH93] 42C HII 12 18 56.19 +47 18 11.2           ~ 2 0
56 [CPH93] 43C HII 12 18 56.28 +47 17 46.0           ~ 2 0
57 [B2011] 10 HII 12 18 56.55 +47 20 15.2           ~ 3 0
58 [B2011] 22 HII 12 18 57.000 +47 13 43.44           ~ 3 0
59 [B2011] 11 HII 12 18 57.37 +47 20 04.3           ~ 2 0
60 [ZKH94] NGC 4258 6 HII 12 18 57.445 +47 17 35.83           ~ 1 0
61 M 106 Sy2 12 18 57.620 +47 18 13.39   9.14 8.41 8.11   ~ 2512 4
62 [CPH93] 54C SNR 12 18 58.13 +47 16 04.2           ~ 5 0
63 [CPH93] 56C HII 12 18 58.52 +47 19 05.0           ~ 2 0
64 [CPH93] 58C HII 12 18 58.614 +47 15 56.09           ~ 2 0
65 [CPH93] 61C HII 12 18 58.93 +47 19 30.6           ~ 2 0
66 [CPH93] 59C HII 12 18 58.997 +47 15 50.89           ~ 2 0
67 [B2011] 24 HII 12 18 59.09 +47 13 33.8           ~ 1 0
68 [ZKH94] NGC 4258 7 HII 12 18 59.308 +47 16 44.46           ~ 1 0
69 [B2011] 21 HII 12 18 59.340 +47 14 14.39           ~ 3 0
70 [CPH93] 69C HII 12 19 00.116 +47 15 36.95           ~ 5 0
71 [CPH93] 74C HII 12 19 01.438 +47 15 25.66           ~ 8 0
72 [B2011] 30 HII 12 19 02.450 +47 11 41.54           ~ 2 0
73 [ZKH94] NGC 4258 5 HII 12 19 02.768 +47 17 08.26           ~ 1 0
74 [B2011] 23 HII 12 19 03.01 +47 13 37.6           ~ 1 0
75 [B2011] 19 HII 12 19 03.56 +47 15 10.6           ~ 2 0
76 [CPH93] 83Ca HII 12 19 05.18 +47 15 00.8           ~ 2 0
77 [CPH93] 2S HII 12 19 07.63 +47 12 40.2           ~ 2 0
78 [CPH93] 4S HII 12 19 09.78 +47 12 16.0           ~ 2 0
79 [B2011] 35 HII 12 19 11.33 +47 10 46.4           ~ 1 0
80 [B2011] 31 HII 12 19 12.68 +47 11 39.6           ~ 1 0
81 [B2011] 29 HII 12 19 13.34 +47 12 01.6           ~ 1 0
82 [B2011] 32 HII 12 19 17.94 +47 11 22.0           ~ 1 0
83 [B2011] 36 HII 12 19 19.49 +47 09 56.0           ~ 1 0
84 [B2011] 34 HII 12 19 19.720 +47 10 51.10           ~ 3 0
85 [B2011] 33 HII 12 19 21.18 +47 11 01.0           ~ 1 0
86 [CPH93] 29S HII 12 19 23.88 +47 13 03.2           ~ 2 0
87 [CPH93] 32S HII 12 19 24.87 +47 12 59.6           ~ 2 0
88 M 100 AGN 12 22 54.9299993592 +15 49 20.296257960 10.04 10.05 9.35     ~ 1963 2
89 NGC 4395 Sy2 12 25 48.8633109888 +33 32 48.700168152 10.84 10.54 10.11 9.98   ~ 1286 1
90 NGC 4414 GiC 12 26 27.1276893168 +31 13 24.626206488 11.12 10.96 10.12     ~ 593 2
91 NGC 4496 GiP 12 31 39.2222392512 +03 56 21.641352828   11.71       ~ 376 0
92 NGC 4527 AGN 12 34 08.49600 +02 39 13.7160   12.4       ~ 549 2
93 NGC 4535 H2G 12 34 20.3443516704 +08 11 51.908488116   11.1       ~ 679 0
94 NGC 4536 H2G 12 34 27.12887 +02 11 16.3680 11.14 11.16 10.55 17.393   ~ 913 3
95 M 91 LIN 12 35 26.4446761320 +14 29 46.760333748   14.63 13.57     ~ 639 0
96 NGC 4639 Sy1 12 42 52.3785000336 +13 15 26.706153600   13.62 12.72     ~ 642 0
97 NGC 4725 Sy2 12 50 26.5716367992 +25 30 02.733090588   13.45 12.44     ~ 727 2
98 NGC 4861 H2G 12 59 02.340 +34 51 33.98   12.90 12.32     ~ 389 2
99 IC 4182 BiC 13 05 48.7478324064 +37 36 12.965157684   11.86   11.40   ~ 344 1
100 M 83 SBG 13 37 00.91920 -29 51 56.7400 8.85 8.11 7.52 7.21   ~ 2778 2
101 NGC 5253 rG 13 39 55.990 -31 38 24.11 11.48 10.94 10.49 10.33 13.47 ~ 1421 4
102 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 3138 2
103 SDH 323 HII 14 03 50.1 +54 38 05           ~ 9 0
104 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1661 0
105 NGC 7331 LIN 22 37 04.0506038088 +34 24 56.800076508 10.65 10.35 9.48     ~ 1284 2
106 NGC 7793 GiG 23 57 49.7540045856 -32 35 27.701550744 10.26 9.74 9.28 9.06 9.7 ~ 1188 2
107 NAME Local Group GrG ~ ~           ~ 9325 0

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