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Abstract:

Aims. 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. Methods. 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' × 7' in the vicinity of G45.45+0.06. Results.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, ∼8 kpc. 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 13CO 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 2 × 106 yr 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. © 2009 ESO.

Registro:

Documento: Artículo
Título:The environs of the ultracompact HII region G45.45+0.06
Autor:Paron, S.; Cichowolski, S.; Ortega, M.E.
Filiación:Instituto de Astronomía y Física Del Espacio (IAFE), Suc. 28, 1428 Buenos Aires, Argentina
Palabras clave:ISM: clouds; ISM: HII regions; Stars: formation; All-sky survey; H II regions; ISM: clouds; ISM: HII regions; Main sequence stars; Molecular gas; Molecular materials; Molecular shells; Morphological correlations; Multi-wavelength study; Spatial scale; Star formations; Stars: formation; Clouds; Ionization of gases; Surveys; Stars
Año:2009
Volumen:506
Número:2
Página de inicio:789
Página de fin:796
DOI: http://dx.doi.org/10.1051/0004-6361/200912646
Título revista:Astronomy and Astrophysics
Título revista abreviado:Astron. Astrophys.
ISSN:00046361
CODEN:AAEJA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v506_n2_p789_Paron

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Citas:

---------- APA ----------
Paron, S., Cichowolski, S. & Ortega, M.E. (2009) . The environs of the ultracompact HII region G45.45+0.06. Astronomy and Astrophysics, 506(2), 789-796.
http://dx.doi.org/10.1051/0004-6361/200912646
---------- CHICAGO ----------
Paron, S., Cichowolski, S., Ortega, M.E. "The environs of the ultracompact HII region G45.45+0.06" . Astronomy and Astrophysics 506, no. 2 (2009) : 789-796.
http://dx.doi.org/10.1051/0004-6361/200912646
---------- MLA ----------
Paron, S., Cichowolski, S., Ortega, M.E. "The environs of the ultracompact HII region G45.45+0.06" . Astronomy and Astrophysics, vol. 506, no. 2, 2009, pp. 789-796.
http://dx.doi.org/10.1051/0004-6361/200912646
---------- VANCOUVER ----------
Paron, S., Cichowolski, S., Ortega, M.E. The environs of the ultracompact HII region G45.45+0.06. Astron. Astrophys. 2009;506(2):789-796.
http://dx.doi.org/10.1051/0004-6361/200912646