2007ApJ...664L..27T


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.12CEST13:52:57

2007ApJ...664L..27T - Astrophys. J., 664, L27-L30 (2007/July-3)

Arclike distribution of high CO (J=3-2)/CO (J=1-0) ratio gas surrounding the central star cluster of the supergiant H II region NGC 604.

TOSAKI T., MIURA R., SAWADA T., KUNO N., NAKANISHI K., KOHNO K., OKUMURA S.K. and KAWABE R.

Abstract (from CDS):

We report the discovery of a high CO (J=3-2)/CO (J=1-0) ratio gas with an arclike distribution (``high-ratio gas arc'') surrounding the central star cluster of the supergiant H II region NGC 604 in the nearby spiral galaxy M33, based on multi-J CO observations of a 5'x5' region of NGC 604 conducted using the ASTE 10 m and NRO 45 m telescopes. The discovered ``high-ratio gas arc'' extends to the southeast-northwest direction with a size of ∼200 pc. The western part of the high-ratio gas arc closely coincides with the shells of the H II regions traced by Hα and radio continuum peaks. The CO (J=3-2)/CO (J=1-0) ratio, R3–2/1–0, ranges between 0.3 and 1.2 in the observed region, and the R3–2/1–0 values of the high-ratio gas arc are around or higher than unity, indicating very warm (Tkin≥60 K) and dense (nH2≥103-104 cm–3) conditions of the high-ratio gas arc. We suggest that the dense gas formation and second-generation star formation occur in the surrounding gas compressed by the stellar wind and/or supernova of the first-generation stars of NGC 604, i.e., the central star cluster of NGC 604.

Abstract Copyright:

Journal keyword(s): Galaxies: Individual: Messier Number: M33 - ISM: H II Regions - ISM: Individual: NGC Number: NGC 604 - ISM: Molecules - Stars: Formation

CDS comments: Parag. 4.1 : Cloud NGC 604-2 = [WS92] NGC 604-2

Simbad objects: 9

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Number of rows : 9

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 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 10905 1
2 M 33 GiG 01 33 50.904 +30 39 35.79 6.17 6.27 5.72     ~ 5135 1
3 NGC 604 HII 01 34 32.1 +30 47 01           ~ 544 0
4 [MKT2012] 1 MoC 01 34 33.0 +30 46 47           ~ 24 0
5 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14832 1
6 NAME 30 Dor Nebula SFR 05 38 36.0 -69 05 11           ~ 1039 2
7 RMC 136 Cl* 05 38 42.396 -69 06 03.36           ~ 1736 1
8 M 83 SBG 13 37 00.919 -29 51 56.74 8.85 8.11 7.52 7.21   ~ 2229 2
9 NAME Local Group GrG ~ ~           ~ 6973 0

    Equat.    Gal    SGal    Ecl

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2020.07.12-13:52:57

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