2007ApJ...671.1297I

Query : 2007ApJ...671.1297I

2007ApJ...671.1297I - Astrophys. J., 671, 1297-1320 (2007/December-3)

Broad-line emission in low-metallicity blue compact dwarf galaxies: evidence for stellar wind, supernova, and possible AGN activity.

IZOTOV Y.I., THUAN T.X. and GUSEVA N.G.

Abstract (from CDS):

We present spectra of a large sample of low-metallicity blue compact dwarf galaxies which exhibit broad components in their strong emission lines, mainly in Hβ, [O III] λλ4959, 5007, and Hα. Twenty-three spectra have been obtained with the MMT, 14 of which show broad emission. The remaining 21 spectra with broad emission have been selected from Data Release 5 of the Sloan Digital Sky Survey. The most plausible origin of broad-line emission is the evolution of massive stars and their interaction with the circumstellar and interstellar medium. The broad emission with the lowest Hα luminosities (1036-1039 ergs/s) is likely produced in circumstellar envelopes around hot Ofp/WN9 and/or LBV stars. The broad emission with the highest Hα luminosities (1040-1042 ergs/s) probably arises from Type IIp or IIn supernovae (SNe). It can also come from active galactic nuclei (AGNs) containing intermediate-mass black holes, although we find no strong evidence for hard nonthermal radiation in our sample galaxies. The oxygen abundance in the host galaxies with SN candidates is low and varies in the range 12+logO/H=7.36-8.31. However, Type IIn SN/AGN candidates are found only in galaxies with 12+logO/H≲7.99. Spectroscopic monitoring of these Type IIn SN/AGN candidates over a timescale of several years is necessary to distinguish between the two possibilities.

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Journal keyword(s): Galaxies: Abundances - Galaxies: Active - Galaxies: Irregular - Galaxies: ISM - ISM: H II Regions - ISM: Kinematics and Dynamics

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 - 2026 		#notes
1 Mrk 996 Sy1 01 27 35.5248944352 -06 19 35.432857848 14.75 15.05 14.48 14.06 13.70 ~ 136 0
2 [PBT2001] SBSG 0335-052 W G 03 37 38.40 -05 02 37.5   19.14     18.85 ~ 110 1
3 SBSG 0335-052B G 03 37 44.04 -05 02 40.2   16.77 16.65   16.79 ~ 220 1
4 SDSS J035334.76-001904.9 G 03 53 34.7662850304 -00 19 04.942634952           ~ 4 0
5 [GPM2009] J0519+0007 G 05 19 02.6953532514 +00 07 29.106797166           ~ 23 0
6 UGCA 116 AGN 05 55 42.645 +03 23 32.23 10.74 11.68 11.46   11.82 ~ 561 0
7 NGC 2363 AG? 07 28 29.59 +69 11 34.3   15.5       ~ 262 1
8 NGC 2363A HII 07 28 42.8 +69 11 21           ~ 588 3
9 NGC 2366 H2G 07 28 52.4529 +69 12 38.859 12.25 11.86 11.39 11.33   ~ 801 0
10 Mrk 94 H2G 08 37 43.4943164808 +51 38 30.209165520   16.5       ~ 26 0
11 US 1442 Sy1 08 40 29.9112912216 +47 07 10.241384412   18.2       ~ 68 0
12 LB 555 EmG 09 30 06.4773062016 +60 26 53.169485316   17.0       ~ 37 0
13 Mrk 116 AGN 09 34 02.1 +55 14 25           ~ 1179 1
14 LEDA 27886 QSO 09 44 17.101 +54 11 28.83   19.5       ~ 72 0
15 SN 1997ab SN* 09 51 00.212 +20 04 19.88   14.7       SNIIn 60 1
16 SDSS J103137.28+043422.0 G 10 31 37.28 +04 34 22.0           ~ 3 0
17 [ITS2007] 52339-578-60 EmG 10 44 57.79689 +03 53 13.1469           ~ 65 0
18 * eta Car s*b 10 45 03.545808 -59 41 03.95124 6.37 7.03 6.48 6.123 4.41 LBV 2543 0
19 NGC 3353 AGN 10 45 22.390 +55 57 37.36 12.90 13.25 12.79     ~ 378 1
20 SN 1988Z SN* 10 51 50.10 +16 00 00.5   16.8       SNIIn 385 1
21 Z 242-46 bCG 11 33 29.12 +49 14 17.4 14.69 14.61 14.25 14.17   ~ 242 1
22 SDSS J114359.53+052154.4 EmG 11 43 59.5439516736 +05 21 54.457372008           ~ 2 0
23 Mrk 193 H2G 11 55 28.34 +57 39 52.0   16.5       ~ 63 0
24 NGC 4395 Sy2 12 25 48.8633109888 +33 32 48.700168152 10.84 10.54 10.11 9.98   ~ 1286 1
25 Z 244-18 bCG 12 26 15.69 +48 29 38.3   15.3       ~ 364 0
26 Mrk 59 rG 12 59 00.288 +34 50 42.45           ~ 319 2
27 NGC 4861 H2G 12 59 02.340 +34 51 33.98   12.90 12.32     ~ 389 2
28 2QZ J132347.5-013252 EmG 13 23 47.4573498792 -01 32 52.048078188           ~ 49 0
29 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 3138 2
30 LEDA 1944409 Sy1 15 36 56.43803 +31 22 48.1058   17.67 17.52     ~ 16 0
31 SDSS J225059.27+000032.7 EmG 22 50 59.27254 +00 00 32.7253           ~ 7 0

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