2009A&A...506..789P


C.D.S. - SIMBAD4 rel 1.7 - 2019.09.20CEST23:30:52

2009A&A...506..789P - Astronomy and Astrophysics, volume 506, 789-796 (2009/11-1)

The environs of the ultracompact HII region G45.45+0.06.

PARON S., CICHOWOLSKI S. and ORTEGA M.E.

Abstract (from CDS):

G45.45+0.06 is an ultra-compact HII (UCHII) region that has been extensively studied. It is known that G45.45+0.06 is embedded in a complex of UCHII regions, but to date, the surrounding ISM on a larger spatial scale has not been analyzed. Using data from large-scale surveys, the Two Micron All Sky Survey, GLIMPSE, MIPSGAL, MAGPIS and GRS, we performed a multiwavelength study of a region of about 7'x7' in the vicinity of G45.45+0.06. We found that the UCHII complex lies on the border of a larger (diameter of ∼3') and fainter HII region, which is located at the same distance as G45.45+0.06, ∼8kpc. In this work, this larger HII region is called G45L. A good morphological correlation is observed between the PDRs and the molecular gas mapped in the J=1-0 and CS J=2-1 lines, suggesting that G45L may be collecting molecular material. From a near- and mid-IR photometric study, we found three sources, likely O-type stars, that are possibly responsible for the creation of G45L. Additionally, we found several YSO candidates lying preferentially in the molecular shell that surrounds G45L. Our results confirm that the region southeast of the UCHII complex where G45.45+0.06 is embedded and east of G45L is undergoing active star formation. We suggest that G45L has been expanding for about 2x106yr and could have triggered the formation of the zero-age main sequence stars that ionize the UCHII region G45.45+0.06. However we cannot discard that both HII regions are coeval.

Abstract Copyright:

Journal keyword(s): ISM: HII regions - ISM: clouds - stars: formation

Nomenclature: [PCO2009] G45L N=1.

Simbad objects: 18

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Number of rows : 18

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 NAME Orion Bright Bar reg 05 35 22.30 -05 24 33.0           ~ 687 0
2 SSTGLMC G045.4250+00.0668 IR 19 14 16.59 +11 07 50.0           ~ 1 0
3 SSTGLMC G045.4274+00.0672 IR 19 14 16.6 +11 07 58           ~ 1 0
4 SSTGLMC G045.3976+00.0473 IR 19 14 17.5 +11 05 49           ~ 1 0
5 SSTGLMC G045.4061+00.0506 IR 19 14 17.89 +11 06 23.0           ~ 1 0
6 SSTGLMC G045.4135+00.0528 IR 19 14 18.26 +11 06 49.0           ~ 1 0
7 SSTGLMC G045.3969+00.0433 IR 19 14 18.3 +11 05 39           ~ 1 0
8 SSTGLMC G045.4260+00.0590 IR 19 14 18.4 +11 07 40           ~ 1 0
9 SSTGLMC G045.4347+00.0627 IR 19 14 18.5 +11 08 12           ~ 1 0
10 SSTGLMC G045.4048+00.0438 IR 19 14 19.2 +11 06 05           ~ 1 0
11 SSTGLMC G045.4024+00.0412 IR 19 14 19.4 +11 05 55           ~ 1 0
12 2MASS J19142040+1105478 IR 19 14 20.4031638534 +11 05 47.879321195           ~ 1 0
13 GAL 045.5+00.0 HII 19 14 20.8 +11 09 04           ~ 136 0
14 [GPD88] 045.454+0.060 HII 19 14 21.3 +11 09 13           ~ 148 1
15 SSTGLMC G045.4437+00.0458 IR 19 14 23.19 +11 08 12.0           ~ 1 0
16 SSTGLMC G045.4420+00.0415 IR 19 14 23.94 +11 08 03.0           ~ 1 0
17 SSTGLMC G045.4255+00.0282 IR 19 14 24.82 +11 06 47.0           ~ 1 0
18 EGO G045.47+0.05 of? 19 14 25.6 +11 09 28           ~ 13 1

    Equat.    Gal    SGal    Ecl

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2019.09.20-23:30:52

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