The HII region G35.673-00.847: Another case of triggered star formation?

Aims. As part of a systematic study that we are performing to increase the observational evidence of triggered star formation in the surroundings of HII regions, we analyze the ISM around the HII region G35.673-00.847, a poorly studied source. Methods. Using data from the large-scale surveys Two Mic...

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Publicado:	2010
Materias:	HII regions ISM: clouds stars: formation All-sky survey Galactic plane surveys Gravitational instability H II regions ISM : clouds Mid-IR emissions Molecular gas Molecular shells Multi-wavelength study Semi-ring Star formations Surrounding materials Systematic study Clouds Stars Surveys
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v525_n8_p_Paron http://hdl.handle.net/20.500.12110/paper_00046361_v525_n8_p_Paron
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_00046361_v525_n8_p_Paron
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spelling	paper:paper_00046361_v525_n8_p_Paron2023-06-08T14:27:55Z The HII region G35.673-00.847: Another case of triggered star formation? HII regions ISM: clouds stars: formation All-sky survey Galactic plane surveys Gravitational instability H II regions ISM : clouds Mid-IR emissions Molecular gas Molecular shells Multi-wavelength study Semi-ring Star formations stars: formation Surrounding materials Systematic study Clouds Stars Surveys Aims. As part of a systematic study that we are performing to increase the observational evidence of triggered star formation in the surroundings of HII regions, we analyze the ISM around the HII region G35.673-00.847, a poorly studied source. Methods. Using data from the large-scale surveys Two Micron All Sky Survey, Galactic Legacy Infrared Mid-Plane Survey Extraordinaire (GLIMPSE), MIPSGAL, Galactic Ring Survey (GRS), VLA Galactic Plane Survey (VGPS), and NRAO VLA Sky Survey (NVSS), we performed a multiwavelength study of G35.673-00.847 and its surroundings. Results. The mid-IR emission shows that G35.673-00.847 has an almost semi-ring like shape with a cut towards the galactic west. The radius of this semi-ring is about 1.′5 (∼1.6 pc, at the distance of ∼3.7 kpc). The distance was estimated from an HI absorption study and the analysis of the molecular gas. We find a molecular shell composed of several clumps distributed around the HII region, suggesting that its expansion is collecting the surrounding material. We identify several YSO candidates across the molecular shell. Finally, comparing the HII region dynamical age and the fragmentation time of the molecular shell, we discard the so-called collect and collapse as being the mechanism responsible for the YSO formation, suggesting that other processes such as radiative-driven implosion and/or small-scale Jeans gravitational instabilities operate. © 2010 ESO. 2010 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v525_n8_p_Paron http://hdl.handle.net/20.500.12110/paper_00046361_v525_n8_p_Paron
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	HII regions ISM: clouds stars: formation All-sky survey Galactic plane surveys Gravitational instability H II regions ISM : clouds Mid-IR emissions Molecular gas Molecular shells Multi-wavelength study Semi-ring Star formations stars: formation Surrounding materials Systematic study Clouds Stars Surveys
spellingShingle	HII regions ISM: clouds stars: formation All-sky survey Galactic plane surveys Gravitational instability H II regions ISM : clouds Mid-IR emissions Molecular gas Molecular shells Multi-wavelength study Semi-ring Star formations stars: formation Surrounding materials Systematic study Clouds Stars Surveys The HII region G35.673-00.847: Another case of triggered star formation?
topic_facet	HII regions ISM: clouds stars: formation All-sky survey Galactic plane surveys Gravitational instability H II regions ISM : clouds Mid-IR emissions Molecular gas Molecular shells Multi-wavelength study Semi-ring Star formations stars: formation Surrounding materials Systematic study Clouds Stars Surveys
description	Aims. As part of a systematic study that we are performing to increase the observational evidence of triggered star formation in the surroundings of HII regions, we analyze the ISM around the HII region G35.673-00.847, a poorly studied source. Methods. Using data from the large-scale surveys Two Micron All Sky Survey, Galactic Legacy Infrared Mid-Plane Survey Extraordinaire (GLIMPSE), MIPSGAL, Galactic Ring Survey (GRS), VLA Galactic Plane Survey (VGPS), and NRAO VLA Sky Survey (NVSS), we performed a multiwavelength study of G35.673-00.847 and its surroundings. Results. The mid-IR emission shows that G35.673-00.847 has an almost semi-ring like shape with a cut towards the galactic west. The radius of this semi-ring is about 1.′5 (∼1.6 pc, at the distance of ∼3.7 kpc). The distance was estimated from an HI absorption study and the analysis of the molecular gas. We find a molecular shell composed of several clumps distributed around the HII region, suggesting that its expansion is collecting the surrounding material. We identify several YSO candidates across the molecular shell. Finally, comparing the HII region dynamical age and the fragmentation time of the molecular shell, we discard the so-called collect and collapse as being the mechanism responsible for the YSO formation, suggesting that other processes such as radiative-driven implosion and/or small-scale Jeans gravitational instabilities operate. © 2010 ESO.
title	The HII region G35.673-00.847: Another case of triggered star formation?
title_short	The HII region G35.673-00.847: Another case of triggered star formation?
title_full	The HII region G35.673-00.847: Another case of triggered star formation?
title_fullStr	The HII region G35.673-00.847: Another case of triggered star formation?
title_full_unstemmed	The HII region G35.673-00.847: Another case of triggered star formation?
title_sort	hii region g35.673-00.847: another case of triggered star formation?
publishDate	2010
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v525_n8_p_Paron http://hdl.handle.net/20.500.12110/paper_00046361_v525_n8_p_Paron
_version_	1768544019502071808

The HII region G35.673-00.847: Another case of triggered star formation?

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