2002MNRAS.335.1079S

Query : 2002MNRAS.335.1079S

2002MNRAS.335.1079S - Mon. Not. R. Astron. Soc., 335, 1079-1084 (2002/October-1)

Radio observations of super star clusters in dwarf starburst galaxies.

STEVENS I.R., FORBES D.A. and NORRIS R.P.

Abstract (from CDS):

We present new radio continuum observations of two dwarf starburst galaxies, NGC 3125 and 5408, with observations at 4.80 GHz (6 cm) and 8.64 GHz (3 cm), taken with the Australia Telescope Compact Array (ATCA). Both galaxies show a complex radio morphology with several emission regions, mostly coincident with massive young star clusters. The radio spectral indices of these regions are negative (with α~-0.5 to -0.7), indicating that the radio emission is dominated by synchrotron emission associated with supernova activity from the starburst. One emission region in NGC 5408 has a flatter index (α~-0.1) indicative of optically thin free-free emission, which could indicate it is a younger cluster. Consequently, in these galaxies we do not see regions with the characteristic positive spectral index indicative of optically obscured star formation regions, as seen in other dwarf starbursts such as Hen 2-10.

Abstract Copyright: RAS

Journal keyword(s): galaxies: individual: NGC 3125 - galaxies: individual: NGC 5408 - galaxies: starburst - galaxies: star clusters - radio continuum: galaxies

Nomenclature: Fig.1, Table 3: [SFN2002] NGC 3125 A (Nos A-B), [SFN2002] NGC 5408 A (Nos A-D). Text: [SFN2002] NGC 3125 SSC N (Nos 1-3), [SFN2002] NGC 5408 SSC N (Nos 1-3).

Simbad objects: 22

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Number of rows : 22
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 1569 rG 04 30 49.186 +64 50 52.52 11.72 11.86 11.03     ~ 1297 3
2 NGC 2146 AGN 06 18 37.710 +78 21 25.27 11.67 11.38 10.59     ~ 765 2
3 MCG-04-21-005 AGN 08 36 15.190 -26 24 33.66 12.04 11.93 11.45 11.09 12.3 ~ 600 3
4 NGC 3049 EmG 09 54 49.651 +09 16 17.90   13.04       ~ 346 1
5 NAME NGC 3125-1 Cl* 10 06 33.29 -29 56 07.8           ~ 26 0
6 NGC 3125 AGN 10 06 33.318 -29 56 07.32 13.03 13.45 13.00 12.50 13.4 ~ 253 2
7 [SFN2002] NGC 3125 A Rad 10 06 33.33 -29 56 06.6           ~ 4 0
8 [SFN2002] NGC 3125 SSC 2 Cl* 10 06 33.90 -29 56 12.8           ~ 1 0
9 [SFN2002] NGC 3125 SSC 3 Cl* 10 06 33.92 -29 56 12.9           ~ 1 0
10 [SFN2002] NGC 3125 B Rad 10 06 33.99 -29 56 12.2           ~ 4 0
11 QSO B1016-311 Bla 10 18 28.7533750344 -31 23 53.846273652   18.71   17.89   ~ 86 1
12 NGC 5253 rG 13 39 55.990 -31 38 24.11 11.48 10.94 10.49 10.33 13.47 ~ 1421 4
13 ICRF J135256.5-441240 BLL 13 52 56.53494646 -44 12 40.3876155   16.95 16.37     ~ 129 3
14 [SFN2002] NGC 5408 A Rad 14 03 18.30 -41 22 51.2           ~ 2 0
15 [SFN2002] NGC 5408 SSC 1 Cl* 14 03 18.34 -41 22 51.5           ~ 1 0
16 [SFN2002] NGC 5408 B Rad 14 03 18.43 -41 22 54.9           ~ 2 0
17 [SFN2002] NGC 5408 SSC 2 Cl* 14 03 18.44 -41 22 53.5           ~ 1 0
18 [SFN2002] NGC 5408 C Rad 14 03 18.59 -41 22 54.9           ~ 2 0
19 [SFN2002] NGC 5408 D Rad 14 03 18.69 -41 22 49.8           ~ 3 0
20 [SFN2002] NGC 5408 SSC 3 Cl* 14 03 18.73 -41 22 49.6           ~ 1 0
21 NGC 5408 EmG 14 03 20.907 -41 22 39.75   12.59   11.96 12.2 ~ 368 3
22 ICRF J193925.0-634245 Sy2 19 39 25.0245304992 -63 42 45.640373400   18.87 18.37 17.64   ~ 1332 2

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