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Abstract:

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. © 2012 ESO.

Registro:

Documento: Artículo
Título:GS100-02-41: A new large H i shell in the outer part of the galaxy
Autor:Suad, L.A.; Cichowolski, S.; Arnal, E.M.; Testori, J.C.
Filiación:Instituto Argentino de Radioastronomía (IAR), (CCT-La PLata), CC 5, 1894 Villa Elisa, Argentina
Instituto de Astronomía y Física Del Espacio (IAFE), CC 67, 1428 Buenos Aires, Argentina
Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de la Plata, Argentina
Palabras clave:HII regions; ISM: kinematics and dynamics; ISM: structure; stars: formation; Age differences; Dense shells; Emission distribution; Energy analysis; Flux densities; H II regions; Infrared data; Infrared emissions; Interstellar mediums; Ionized gas; ISM: Kinematics and dynamics; ISM: structure; Massive stars; Multi-wavelength study; Neutral gas; Non-circular; Physical conditions; Radio continuum; Relative location; Shell structure; stars: formation; Strong winds; Velocity range; Energy management; Ionization of gases; Stars; Shells (structures)
Año:2012
Volumen:538
DOI: http://dx.doi.org/10.1051/0004-6361/201118087
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_v538_n_p_Suad

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Citas:

---------- APA ----------
Suad, L.A., Cichowolski, S., Arnal, E.M. & Testori, J.C. (2012) . GS100-02-41: A new large H i shell in the outer part of the galaxy. Astronomy and Astrophysics, 538.
http://dx.doi.org/10.1051/0004-6361/201118087
---------- CHICAGO ----------
Suad, L.A., Cichowolski, S., Arnal, E.M., Testori, J.C. "GS100-02-41: A new large H i shell in the outer part of the galaxy" . Astronomy and Astrophysics 538 (2012).
http://dx.doi.org/10.1051/0004-6361/201118087
---------- MLA ----------
Suad, L.A., Cichowolski, S., Arnal, E.M., Testori, J.C. "GS100-02-41: A new large H i shell in the outer part of the galaxy" . Astronomy and Astrophysics, vol. 538, 2012.
http://dx.doi.org/10.1051/0004-6361/201118087
---------- VANCOUVER ----------
Suad, L.A., Cichowolski, S., Arnal, E.M., Testori, J.C. GS100-02-41: A new large H i shell in the outer part of the galaxy. Astron. Astrophys. 2012;538.
http://dx.doi.org/10.1051/0004-6361/201118087