CDS

2007ApJ...661..115G

Query : 2007ApJ...661..115G

2007ApJ...661..115G - Astrophys. J., 661, 115-134 (2007/May-3)

Chemical and photometric evolution of extended ultraviolet disks: optical spectroscopy of M83 (NGC 5236) and NGC 4625.

GIL DE PAZ A., MADORE B.F., BOISSIER S., THILKER D., BIANCHI L., SANCHEZ CONTRERAS C., BARLOW T.A., CONROW T., FORSTER K., FRIEDMAN P.G., MARTIN D.C., MORRISSEY P., NEFF S.G., RICH R.M., SCHIMINOVICH D., SEIBERT M., SMALL T., DONAS J., HECKMAN T.M., LEE Y.-W., MILLIARD B., SZALAY A.S., WYDER T.K. and YI S.

Abstract (from CDS):

We present the results from the analysis of optical spectra of 31 Hα-selected regions in the extended UV (XUV) disks of M83 (NGC 5236) and NGC 4625 recently discovered by GALEX. The spectra were obtained using IMACS at the Las Campanas Observatory 6.5 m Magellan I telescope and COSMIC at the Palomar 200 inch (5 m) telescope, respectively, for M83 and NGC 4625. The line ratios measured indicate nebular oxygen abundances (derived from the R23 parameter) of the order of Z☉/5-Z☉/10. For most emission-line regions analyzed the line fluxes and ratios measured are best reproduced by models of photoionization by single stars with masses in the range 20-40 M☉ and oxygen abundances comparable to those derived from the R23 parameter. We find indications for a relatively high N/O abundance ratio in the XUV disk of M83. Although the metallicities derived imply that these are not the first stars formed in the XUV disks, such a level of enrichment could be reached in young spiral disks only 1 Gyr after these first stars would have formed. The amount of gas in the XUV disks allows maintaining the current level of star formation for at least a few Gyr.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Abundances - Galaxies: Evolution - ISM: H II Regions - Techniques: Spectroscopic - Ultraviolet: Galaxies

Nomenclature: Table 2: [GMB2007] NGC 5236 XUV NN (Nos 1-22), [GMB2007] NGC 4625 XUV NN (Nos 1-12). text: [GMB2007] Background G N (Nos 1-2).

Simbad objects: 43

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Number of rows : 43
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022 		#notes
1 NGC 1058 Sy2 02 43 30.0264850248 +37 20 28.782851784   12.29 11.75 10.85   ~ 451 0
2 CD-32 5613 WD* 08 41 32.4290850497 -32 56 32.915823461   12.07 11.85 12.3   DA5.5 288 0
3 HD 93521 * 10 48 23.5113981120 +37 34 13.083332412 5.67 6.79 7.03     O9.5IIInn 413 1
4 [GMB2007] Background G 2 G 12 41 41.89 +41 16 10.9           ~ 1 0
5 [GMB2007] NGC 4625 XUV 12 HII 12 41 42.977 +41 16 37.95           ~ 4 0
6 [GMB2007] NGC 4625 XUV 11 MoC 12 41 45.151 +41 16 00.29           ~ 2 0
7 [GMB2007] NGC 4625 XUV 10 HII 12 41 48.677 +41 17 46.81           ~ 4 0
8 [GMB2007] NGC 4625 XUV 9 MoC 12 41 51.538 +41 15 17.52           ~ 2 0
9 NGC 4625 GiP 12 41 52.7121819576 +41 16 26.115765780 12.74 12.92 12.35     ~ 334 2
10 [GMB2007] NGC 4625 XUV 8 HII 12 41 54.310 +41 17 26.82           ~ 4 0
11 [GMB2007] NGC 4625 XUV 7 HII 12 41 56.234 +41 15 30.90           ~ 4 0
12 [GMB2007] NGC 4625 XUV 6 MoC 12 41 57.029 +41 15 53.65           ~ 2 0
13 [GMB2007] NGC 4625 XUV 5 HII 12 41 59.150 +41 15 21.11           ~ 4 0
14 [GMB2007] NGC 4625 XUV 4 HII 12 42 00.322 +41 16 39.80           ~ 4 0
15 [GMB2007] NGC 4625 XUV 3 HII 12 42 04.025 +41 16 35.98           ~ 4 0
16 [GMB2007] NGC 4625 XUV 2 HII 12 42 05.136 +41 16 12.14           ~ 4 0
17 [GMB2007] NGC 4625 XUV 1 UV 12 42 07.985 +41 14 13.65           ~ 2 0
18 [GMB2007] NGC 5236 XUV 1 UV 13 36 55.17 -30 05 47.4           ~ 3 0
19 [GMB2007] NGC 5236 XUV 4 UV 13 36 56.222 -30 06 53.40           ~ 1 0
20 [GMB2007] NGC 5236 XUV 13 UV 13 36 58.52 -29 59 24.5           ~ 4 0
21 [GMB2007] NGC 5236 XUV 2 UV 13 36 58.64 -30 06 00.5           ~ 4 0
22 [GMB2007] NGC 5236 XUV 12 UV 13 36 58.772 -29 59 20.82           ~ 1 0
23 [GMB2007] NGC 5236 XUV 5 UV 13 36 59.284 -30 01 01.85           ~ 1 0
24 [GMB2007] NGC 5236 XUV 3 UV 13 37 00.371 -30 05 54.83           ~ 1 0
25 M 83 SBG 13 37 00.91920 -29 51 56.7400 8.85 8.11 7.52 7.21   ~ 2410 2
26 [GMB2007] NGC 5236 XUV 6 UV 13 37 01.69 -30 00 54.3           ~ 2 0
27 [GMB2007] NGC 5236 XUV 14 UV 13 37 01.713 -29 58 16.75           ~ 1 0
28 [GMB2007] NGC 5236 XUV 20 UV 13 37 02.316 -29 57 18.89           ~ 1 0
29 [GMB2007] NGC 5236 XUV 9 UV 13 37 04.99 -29 59 45.9           ~ 4 0
30 [GMB2007] NGC 5236 XUV 7 UV 13 37 05.182 -30 00 14.37           ~ 1 0
31 [GMB2007] NGC 5236 XUV 10 UV 13 37 05.242 -29 59 33.30           ~ 1 0
32 [GMB2007] NGC 5236 XUV 15 UV 13 37 06.354 -29 57 51.15           ~ 1 0
33 [GMB2007] NGC 5236 XUV 16 UV 13 37 06.627 -29 58 46.02           ~ 1 0
34 [GMB2007] NGC 5236 XUV 19 UV 13 37 06.730 -29 57 42.46           ~ 1 0
35 [GMB2007] NGC 5236 XUV 8 UV 13 37 06.76 -29 59 57.0           ~ 3 0
36 [GMB2007] NGC 5236 XUV 22 UV 13 37 07.13 -29 56 47.6           ~ 3 0
37 [GMB2007] NGC 5236 XUV 11 UV 13 37 08.20 -29 59 19.6           ~ 4 0
38 [GMB2007] NGC 5236 XUV 17 UV 13 37 09.362 -29 59 08.94           ~ 1 0
39 [GMB2007] NGC 5236 XUV 21 UV 13 37 11.409 -29 55 34.79           ~ 1 0
40 [GMB2007] NGC 5236 XUV 18 UV 13 37 16.414 -29 57 48.10           ~ 1 0
41 [GMB2007] Background G 1 G 13 37 24.53 -29 57 20.1           ~ 1 0
42 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 2727 2
43 BD+33 2642 pA* 15 51 59.8854348048 +32 56 54.329485272 9.806 10.61 10.73 10.884 10.961 O7p 398 0

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2022.08.07-21:01:22

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