GS100-02-41: a new large H i shell in the outer part of the galaxy
Context. Massive stars have a profound effect on the surrounding interstellar medium. They ionize and heat the neutral gas, and with their strong winds they sweep up the gas, forming large H I shells. In this way, they generate a dense shell that provides the physical conditions for the formation of...
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| Formato: | Articulo |
| Lenguaje: | Inglés |
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2012
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| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/84123 |
| Aporte de: |
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I19-R120-10915-84123 |
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dspace |
| institution |
Universidad Nacional de La Plata |
| institution_str |
I-19 |
| repository_str |
R-120 |
| collection |
SEDICI (UNLP) |
| language |
Inglés |
| topic |
Ciencias Astronómicas HII regions ISM: kinematics and dynamics ISM: structure stars: formation |
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Ciencias Astronómicas HII regions ISM: kinematics and dynamics ISM: structure stars: formation Suad, Laura Andrea Cichowolski, Silvina Arnal, Edmundo Marcelo Testori, Juan Carlos GS100-02-41: a new large H i shell in the outer part of the galaxy |
| topic_facet |
Ciencias Astronómicas HII regions ISM: kinematics and dynamics ISM: structure stars: formation |
| description |
Context. Massive stars have a profound effect on the surrounding interstellar medium. They ionize and heat the neutral gas, and with their strong winds they sweep up the gas, forming large H I shells. In this way, they generate a dense shell that provides the physical conditions for the formation of new stars. Aims. The aim of this study is to analyze the origin and evolution of the large H I shell GS 100-02-41 and its role in triggering star-forming processes. Methods. To characterize the shell and its environs, we carried out a multi-wavelength study. We analyzed the H I 21 cm line, the radio continuum, and infrared emission distributions. Results. The analysis of the H I data shows an expanding shell structure centered at (l,b) = (100°.6,-2°.04) in the velocity range from-29 to-51.7 km s -1. Taking into account noncircular motions, we infer for GS 100-02-41 a kinematical distance of 2.8 ± 0.6 kpc. Several massive stars belonging to Cep OB1 are located in projection within the large H I shell boundaries. The analysis of the radio continuum and infrared data reveals that there is no continuum counterpart of the H I shell. On the other hand, three slightly extended radio continuum sources are observed in projection onto the dense H I shell. From their flux density determinations we infer that they are thermal in nature. An analysis of the H I emission distribution in the environs of these sources shows a region of low emissivity for each of them, which correlates well morphologically with the ionized gas in a velocity range similar to the one where GS 100-02-41 is detected. Conclusions. Based on an energy analysis, we conclude that the origin of GS 100-02-41 could have been mainly caused by the action of the Cep OB1 massive stars located inside the H I shell. The obtained age difference between the H I shell and the H II regions, together with their relative location, lead us to conclude that the ionizing stars could have been created as a consequence of the shell evolution. |
| format |
Articulo Articulo |
| author |
Suad, Laura Andrea Cichowolski, Silvina Arnal, Edmundo Marcelo Testori, Juan Carlos |
| author_facet |
Suad, Laura Andrea Cichowolski, Silvina Arnal, Edmundo Marcelo Testori, Juan Carlos |
| author_sort |
Suad, Laura Andrea |
| title |
GS100-02-41: a new large H i shell in the outer part of the galaxy |
| title_short |
GS100-02-41: a new large H i shell in the outer part of the galaxy |
| title_full |
GS100-02-41: a new large H i shell in the outer part of the galaxy |
| title_fullStr |
GS100-02-41: a new large H i shell in the outer part of the galaxy |
| title_full_unstemmed |
GS100-02-41: a new large H i shell in the outer part of the galaxy |
| title_sort |
gs100-02-41: a new large h i shell in the outer part of the galaxy |
| publishDate |
2012 |
| url |
http://sedici.unlp.edu.ar/handle/10915/84123 |
| work_keys_str_mv |
AT suadlauraandrea gs1000241anewlargehishellintheouterpartofthegalaxy AT cichowolskisilvina gs1000241anewlargehishellintheouterpartofthegalaxy AT arnaledmundomarcelo gs1000241anewlargehishellintheouterpartofthegalaxy AT testorijuancarlos gs1000241anewlargehishellintheouterpartofthegalaxy |
| bdutipo_str |
Repositorios |
| _version_ |
1764820488397258756 |