A multifrequency study of the active star forming region NGC 6357

To investigate the interaction of the massive stars with the gas and dust in the active star forming region NGC 6357, located in the Sagittarius spiral arm at a distance of 1.7-2.6 kpc (Massey et al. 2001), we analyzed the distribution of the neutral and ionized gas, and that of the dust, based on H...

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Autores principales: Cappa, Cristina Elisabet, Barbá, Rodolfo Héctor, Arnal, Edmundo Marcelo, Duronea, Nicolás Urbano, Fernández Lajús, Eduardo, Goss, W. M., Vasquez, Javier
Formato: Articulo Comunicacion
Lenguaje:Inglés
Publicado: 2007
Materias:
Ciencias Astronómicas
Física
ISM: bubbles
ISM: HII regions
ISM: individual (NGC6357)
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/83067
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-83067
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Astronómicas
Física
ISM: bubbles
ISM: HII regions
ISM: individual (NGC6357)
spellingShingle Ciencias Astronómicas
Física
ISM: bubbles
ISM: HII regions
ISM: individual (NGC6357)
Cappa, Cristina Elisabet
Barbá, Rodolfo Héctor
Arnal, Edmundo Marcelo
Duronea, Nicolás Urbano
Fernández Lajús, Eduardo
Goss, W. M.
Vasquez, Javier
A multifrequency study of the active star forming region NGC 6357
topic_facet Ciencias Astronómicas
Física
ISM: bubbles
ISM: HII regions
ISM: individual (NGC6357)
description To investigate the interaction of the massive stars with the gas and dust in the active star forming region NGC 6357, located in the Sagittarius spiral arm at a distance of 1.7-2.6 kpc (Massey et al. 2001), we analyzed the distribution of the neutral and ionized gas, and that of the dust, based on H, [OIII] and [SII] images obtained with the Curtis-Schmidt telescope at CTIO, radio continuum observations at 1.465 MHz obtained with the Very Large Array (NRAO) in the DnC configuration (synthesized beam = 38), Hi data from the Parkes survey (angular resolution = 15), CO(1-0) observations obtained with the Nanten radiotelescope at Las Campanas Observatory (angular resolution = 2.7), and IR images in the four MSX bands (angular resolution = 18.3). NGC 6357 consists of a low excitation ionized envelope, 50' in diameter, Hll regions in different evolutionary stages (Felli et al. 1990), molecular clouds, OB stars (most of them belonging to the open cluster Pismis 24), and IR sources (Persi et al. 1986). The [Sll]/Ha and [Olll|/Ha line ratios confirm the low excitation of the ionized envelope. Although the Hl emission distribution is dominated by absorption due to radio continuum sources, the optical filaments to the E and W are seen surrounded by neutral gas with velocities in the range -12 to +2 km s-1. The CO emission distribution shows molecular gas associated with the region with velocities in the range -7 to +1 km s-1. A detailed analysis of the region reveals interstellar bubbles and photodissociation regions created by the massive stars in Pi 24 and by undisclosed ionizing sources.
format Articulo
Comunicacion
author Cappa, Cristina Elisabet
Barbá, Rodolfo Héctor
Arnal, Edmundo Marcelo
Duronea, Nicolás Urbano
Fernández Lajús, Eduardo
Goss, W. M.
Vasquez, Javier
author_facet Cappa, Cristina Elisabet
Barbá, Rodolfo Héctor
Arnal, Edmundo Marcelo
Duronea, Nicolás Urbano
Fernández Lajús, Eduardo
Goss, W. M.
Vasquez, Javier
author_sort Cappa, Cristina Elisabet
title A multifrequency study of the active star forming region NGC 6357
title_short A multifrequency study of the active star forming region NGC 6357
title_full A multifrequency study of the active star forming region NGC 6357
title_fullStr A multifrequency study of the active star forming region NGC 6357
title_full_unstemmed A multifrequency study of the active star forming region NGC 6357
title_sort multifrequency study of the active star forming region ngc 6357
publishDate 2007
url http://sedici.unlp.edu.ar/handle/10915/83067
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