2011MNRAS.412.1246G

Query : 2011MNRAS.412.1246G

2011MNRAS.412.1246G - Mon. Not. R. Astron. Soc., 412, 1246-1258 (2011/April-1)

On the nature of the H II regions in the extended ultraviolet disc of NGC 4625.

GODDARD Q.E., BRESOLIN F., KENNICUTT R.C., RYAN-WEBER E.V. and ROSALES-ORTEGA F.F.

Abstract (from CDS):

Using deep Subaru/Faint Object Camera And Spectrograph (FOCAS) spectra of 34 H II regions in both the inner and outer parts of the extended ultraviolet (XUV) disc galaxy NGC 4625 we have measured an abundance gradient out to almost 2.5 times the optical isophotal radius. We applied several strong line abundance calibrations to determine the H II region abundances, including R23, [N II]/[O II], [N II]/Hα as well as the [O III] λ4363 auroral line, which we detected in three of the H II regions. We find that at the transition between the inner and outer disc the abundance gradient becomes flatter. In addition, there appears to be an abundance discontinuity in proximity of this transition. Several of our target H II regions appear to deviate from the ionization sequence defined in the [N II]/Hα versus [O III]/Hβ diagnostic diagram by bright extragalactic H II regions. Using theoretical models we conclude that the most likely explanations for these deviations are either related to the time evolution of the H II regions or stochastic variations in the ionizing stellar populations of these low-mass H II regions, although we are unable to distinguish between these two effects. Such effects can also impact on the reliability of the strong line abundance determinations.

Abstract Copyright: 2010 The Authors Monthly Notices of the Royal Astronomical Society2010 RAS

Journal keyword(s): galaxies: abundances - galaxies: individual: NGC 4625 - galaxies: ISM - galaxies: structure

Nomenclature: Table 1: [GBK2011] NNNa N=30 among (Nos 103-223), [GBK2011] NNN.NNN N=4.

Simbad objects: 47

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Number of rows : 47
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 NGC 300 GiG 00 54 53.4465638304 -37 41 03.168402396 8.83 8.69 8.13 7.46   ~ 1614 2
2 M 74 G 01 36 41.7451236624 +15 47 01.107512304 10.52 10.00 9.46 9.16   ~ 1934 1
3 NGC 1058 Sy2 02 43 30.0264850248 +37 20 28.782851784   12.29 11.75 10.85   ~ 483 0
4 BD+52 913 WD* 05 05 30.6180977592 +52 49 51.919301604 10.25 11.44 11.69 11.93 12.108 DA.8 1153 0
5 GD 71 WD* 05 52 27.6198591816 +15 53 13.228887444 11.675 12.783 13.032 13.169 13.337 DA1.5 407 0
6 NGC 4618 GiP 12 41 32.8976471760 +41 09 03.185175528 11.03 11.22 10.78     ~ 344 2
7 [GMB2007] NGC 4625 XUV 12 HII 12 41 42.977 +41 16 37.95           ~ 4 0
8 [GBK2011] 203 HII 12 41 43.11 +41 16 48.0           ~ 2 0
9 [GBK2011] 104.204 HII 12 41 44.43 +41 17 15.3           ~ 2 0
10 [GBK2011] 105 HII 12 41 45.24 +41 17 34.5           ~ 2 0
11 [GBK2011] 205 HII 12 41 45.29 +41 17 17.2           ~ 2 0
12 [GBK2011] 106 HII 12 41 45.94 +41 15 58.2           ~ 2 0
13 [GBK2011] 107.207 HII 12 41 47.45 +41 15 28.8           ~ 2 0
14 [GMB2007] NGC 4625 XUV 10 HII 12 41 48.677 +41 17 46.81           ~ 4 0
15 [GBK2011] 208 HII 12 41 49.00 +41 15 22.0           ~ 2 0
16 [GBK2011] 210a HII 12 41 50.29 +41 16 18.7           ~ 2 0
17 [GBK2011] 110a HII 12 41 50.30 +41 16 10.0           ~ 2 0
18 [GBK2011] 113 HII 12 41 51.34 +41 16 36.0           ~ 2 0
19 [GBK2011] 213 HII 12 41 51.50 +41 16 27.3           ~ 2 0
20 [GBK2011] 114 HII 12 41 51.91 +41 16 37.4           ~ 2 0
21 [GBK2011] 214 HII 12 41 52.06 +41 16 21.1           ~ 2 0
22 [GBK2011] 215 HII 12 41 52.65 +41 16 06.9           ~ 2 0
23 [GBK2011] 115 HII 12 41 52.70 +41 16 23.6           ~ 2 0
24 NGC 4625 SyG 12 41 52.7121819576 +41 16 26.115765780 12.74 12.92 12.35     ~ 383 2
25 [GBK2011] 116a HII 12 41 53.02 +41 16 33.9           ~ 2 0
26 [GBK2011] 116b HII 12 41 53.13 +41 16 33.9           ~ 2 0
27 [GBK2011] 116c HII 12 41 53.36 +41 16 34.5           ~ 2 0
28 [GBK2011] 216 HII 12 41 53.80 +41 17 02.0           ~ 2 0
29 [GMB2007] NGC 4625 XUV 8 HII 12 41 54.310 +41 17 26.82           ~ 4 0
30 [GBK2011] 217 HII 12 41 54.64 +41 16 12.1           ~ 2 0
31 [GMB2007] NGC 4625 XUV 7 HII 12 41 56.234 +41 15 30.90           ~ 4 0
32 [GBK2011] 121 HII 12 41 58.06 +41 15 43.8           ~ 2 0
33 [GMB2007] NGC 4625 XUV 5 HII 12 41 59.150 +41 15 21.11           ~ 4 0
34 [GBK2011] 221b HII 12 41 59.49 +41 15 23.3           ~ 2 0
35 [GBK2011] 221a HII 12 42 00.06 +41 15 23.1           ~ 2 0
36 [GMB2007] NGC 4625 XUV 4 HII 12 42 00.322 +41 16 39.80           ~ 4 0
37 [GBK2011] 124 HII 12 42 01.38 +41 17 11.6           ~ 2 0
38 [GBK2011] 223 HII 12 42 02.02 +41 16 19.1           ~ 2 0
39 [GMB2007] NGC 4625 XUV 3 HII 12 42 04.025 +41 16 35.98           ~ 4 0
40 [GMB2007] NGC 4625 XUV 2 HII 12 42 05.136 +41 16 12.14           ~ 4 0
41 [GBK2011] 131.228 HII 12 42 06.40 +41 16 55.6           ~ 2 0
42 HZ 44 HS* 13 23 35.2629445608 +36 07 59.544140304 10.186 11.42 11.65 12.00 11.995 sdBN0VIIHe28 439 0
43 M 83 SBG 13 37 00.91920 -29 51 56.7400 8.85 8.11 7.52 7.21   ~ 2778 2
44 NGC 5253 rG 13 39 55.990 -31 38 24.11 11.48 10.94 10.49 10.33 13.47 ~ 1421 4
45 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 3138 2
46 BD+33 2642 pA* 15 51 59.8854348048 +32 56 54.329485272 9.806 10.61 10.73 10.884 10.961 O7p 456 0
47 NGC 6946 H2G 20 34 52.332 +60 09 13.24   10.5       ~ 2661 2

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