2009A&A...499..455C


C.D.S. - SIMBAD4 rel 1.7 - 2020.09.30CEST19:06:15

2009A&A...499..455C - Astronomy and Astrophysics, volume 499, 455-464 (2009/5-4)

On the massive star content of the nearby dwarf irregular Wolf-Rayet galaxy IC 4662.

CROWTHER P.A. and BIBBY J.L.

Abstract (from CDS):

We investigate the massive stellar content of the nearby dwarf irregular Wolf-Rayet galaxy IC 4662, and consider its global star forming properties in the context of other metal-poor galaxies, namely the SMC, IC 10 and NGC 1569. Very Large Telescope/FORS2 imaging and spectroscopy plus archival Hubble Space Telescope/ACS imaging datasets permit us to spatially identify the location, number and probable subtypes of Wolf-Rayet stars within this galaxy. We also investigate suggestions that a significant fraction of the ionizing photons of the two giant Hii regions A1 and A2 lie deeply embedded within these regions. Wolf-Rayet stars are associated with a number of sources within IC 4662-A1 and A2, plus a third compact Hii region to the north west of A1 (A1-NW). Several sources appear to be isolated, single (or binary) luminous nitrogen sequence WR stars, while extended sources are clusters whose masses exceed the Orion Nebula Cluster by, at most, a factor of two. IC 4662 lacks optically visible young massive, compact clusters that are common in other nearby dwarf irregular galaxies. A comparison between radio and Hα-derived ionizing fluxes of A1 and A2 suggests that 30-50% of their total Lyman continuum fluxes lie deeply embedded within these regions. The star formation surface density of IC 4662 is insufficient for this galaxy to qualify as a starburst galaxy, based upon its photometric radius, R25. If instead, we were to adopt the V-band scale length RD from Hunter & Elmegreen (2004AJ....128.2170H), IC 4662 would comfortably qualify as a starburst galaxy, since its star formation intensity would exceed 0.1M/yr/kpc2.

Abstract Copyright:

Journal keyword(s): galaxies: individual: IC 4662 - stars: Wolf-Rayet - ISM: HII regions - galaxies: star clusters - galaxies: starburst - galaxies: dwarf

Nomenclature: Fig. 2, Table 4: [CB2009] A1-NW, [CB2009] AN-WRN (Nos A1-WR1 to A1-WR4, A2-WR1 to A2-WR3), [CB2009] AN-HII N (Nos A1-HII 1 to A1-HII 2, A2-HII 1 to A2-HII 2), [CB2009] A1-C1.

Simbad objects: 36

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Number of rows : 36

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 IC 10 G 00 20 23.16 +59 17 34.7   13.6 9.5     ~ 1013 0
2 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9527 1
3 NGC 346 Cl* 00 59 05.090 -72 10 33.24           ~ 450 0
4 HD 5980 WR* 00 59 26.5847969465 -72 09 53.927725716   11.13 11.31   11.029 WN4+O7I: 362 1
5 NGC 1569 IG 04 30 49.186 +64 50 52.52 11.72 11.86 11.03     ~ 1156 3
6 NGC 1705 SBG 04 54 13.500 -53 21 39.82 12.32 12.96 12.56 12.58 12.9 ~ 598 1
7 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14950 1
8 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2006 1
9 RMC 136 Cl* 05 38 42.396 -69 06 03.36           ~ 1749 1
10 NGC 2366 H2G 07 28 51.85 +69 12 31.1 12.25 11.86 11.39 11.33   ~ 709 0
11 NGC 3125 H2G 10 06 33.318 -29 56 07.32 13.03 13.45 13.00 12.50 13.4 ~ 216 1
12 V* V712 Car bL* 10 23 58.0120989646 -57 45 48.938103165 15.466 15.473 13.5 12.6   O3If*/WN6+O3If*/WN6 148 1
13 Cl Westerlund 2 OpC 10 23 58.1 -57 45 49   11.59 10.5     ~ 286 0
14 NGC 3603 OpC 11 15 18.6 -61 15 26           ~ 958 1
15 NGC 5253 AGN 13 39 55.990 -31 38 24.11 11.48 10.94 10.49 10.33   ~ 1273 4
16 NAME IC 4662 D PoG 17 46 50 -64 39.0           ~ 8 0
17 [HMM90] A2 HII 17 46 59 -64 38.7           ~ 13 0
18 [HMM90] A1 HII 17 46 59 -64 38.7           ~ 13 0
19 [CB2009] A1-HII 1 HII 17 47.0 -64 38           ~ 1 0
20 [CB2009] A2-HII 1 HII 17 47.0 -64 38           ~ 1 0
21 [CB2009] A1-HII 2 HII 17 47.0 -64 38           ~ 1 0
22 [CB2009] A2-HII 2 HII 17 47.0 -64 38           ~ 1 0
23 [CB2009] A1-WR3 WR* 17 47 08.18 -64 38 09.7           WC? 1 0
24 [CB2009] A1-WR4 WR* 17 47 08.20 -64 38 09.7           WC? 1 0
25 [CB2009] A1-WR1 WR* 17 47 08.66 -64 38 17.1           WN5-6ha 1 0
26 [CB2009] A1-WR2 WR* 17 47 08.77 -64 38 18.1           WN5-6 1 0
27 [VS2006] IC 4662 4 Rad 17 47 08.79 -64 38 09.8           ~ 3 0
28 IC 4662 bCG 17 47 09.192 -64 38 19.25   11.75 11.1 10.45   ~ 221 4
29 [CB2009] A1-C1 WR? 17 47 09.45 -64 38 18.8           ~ 2 0
30 [CB2009] A2-WR2 WR* 17 47 10.52 -64 38 20.6           WN5-6 1 0
31 [CB2009] A2-WR3 WR* 17 47 10.74 -64 38 20.6           WN5-6 1 0
32 [CB2009] A2-WR1 WR* 17 47 11.03 -64 38 21.2           WN5-6ha 1 0
33 [HMM90] B PoG ~ ~           ~ 6 0
34 [HMM90] A PoG ~ ~           ~ 3 0
35 NAME Local Group GrG ~ ~           ~ 7042 0
36 [HMM90] C PoG ~ ~           ~ 5 0

    Equat.    Gal    SGal    Ecl

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2020.09.30-19:06:15

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