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Cichowolski, S.; Romero, G.A.; Ortega, M.E.; Cappa, C.E.; Vasquez, J. "Unveiling the birth and evolution of the H ii region Sh2-173" (2009) Monthly Notices of the Royal Astronomical Society. 394(2):900-915
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Abstract:

Based on a multiwavelength study, the interstellar medium around the H ii region Sh2-173 has been analysed. The ionized region is clearly detected in the optical and the radio continuum images. The analysis of the H i data shows a region of low emissivity that has an excellent morphological correlation with the radio continuum emission. The H ii region is partially bordered by a photodissociation region, which, in turn, is encircled by a molecular structure. The H i and CO structures related to Sh2-173 are observed in the velocity ranges from -25 to -31 km s -1 and from -27 to -39 km s -1, respectively. Taking into account the presence of non-circular motions in the Perseus spiral arm, together with previous distance estimates for the region, we adopt a distance of 2.5 ± 0.5 kpc for Sh2-173. Seven hot stars were identified in the field of Sh2-173, being only one O-type star. The amount of energetic photons emitted by this star is enough to keep the region ionized and heat the dust. Given that an expanding H ii region may trigger star formation, a search for young stellar object (YSO) candidates was made using different infrared point source catalogues. A population of 46 YSO candidates was identified, projected on to the molecular clouds. On the other hand, Sh2-173 is located in a dense edge of a large (∼5°) H i shell, GSH 117.8+1.5-35. The possibility of Sh2-173 being part of a hierarchical system of three generations is suggested. In this scenario, the large H i shell, which probably originated due to the action of Cas OB5, would have triggered the formation of Sh2-173, which, in turn, is triggering new stars in its surrounding molecular cloud. To test this hypothesis, the ages of both the H ii region and the large shell were estimated and compared. We concluded that Sh2-173 is a young H ii region of about 0.6-1.0 Myr old. As for the large shell, we obtained a dynamical age of 5 ± 1 Myr. These age estimates, together with the relative location of the different structures, support the hypothesis that Sh2-173 is part of a hierarchical system. © 2009 RAS.

Registro:

Documento: Artículo
Título:Unveiling the birth and evolution of the H ii region Sh2-173
Autor:Cichowolski, S.; Romero, G.A.; Ortega, M.E.; Cappa, C.E.; Vasquez, J.
Filiación:Instituto de Astronomía y Física del Espacio (IAFE), CC 67, Suc. 28, 1428 Buenos Aires, Argentina
Instituto Argentino de Radioastronomía (CCT-La Plata, CONICET), CC 5, 1894 Villa Elisa, Argentina
Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, Paseo del Bosque s/n, 1900 La Plata, Argentina
Departamento de Física y Astronomía, Facultad de Ciencias, Universidad de Valparaiso, Valparaiso, Chile
Palabras clave:H ii regions; ISM: individual: Sh2-173; ISM: kinematics and dynamics; Stars: formation
Año:2009
Volumen:394
Número:2
Página de inicio:900
Página de fin:915
DOI: http://dx.doi.org/10.1111/j.1365-2966.2008.14322.x
Título revista:Monthly Notices of the Royal Astronomical Society
Título revista abreviado:Mon. Not. R. Astron. Soc.
ISSN:00358711
CODEN:MNRAA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00358711_v394_n2_p900_Cichowolski

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Citas:

---------- APA ----------
Cichowolski, S., Romero, G.A., Ortega, M.E., Cappa, C.E. & Vasquez, J. (2009) . Unveiling the birth and evolution of the H ii region Sh2-173. Monthly Notices of the Royal Astronomical Society, 394(2), 900-915.
http://dx.doi.org/10.1111/j.1365-2966.2008.14322.x
---------- CHICAGO ----------
Cichowolski, S., Romero, G.A., Ortega, M.E., Cappa, C.E., Vasquez, J. "Unveiling the birth and evolution of the H ii region Sh2-173" . Monthly Notices of the Royal Astronomical Society 394, no. 2 (2009) : 900-915.
http://dx.doi.org/10.1111/j.1365-2966.2008.14322.x
---------- MLA ----------
Cichowolski, S., Romero, G.A., Ortega, M.E., Cappa, C.E., Vasquez, J. "Unveiling the birth and evolution of the H ii region Sh2-173" . Monthly Notices of the Royal Astronomical Society, vol. 394, no. 2, 2009, pp. 900-915.
http://dx.doi.org/10.1111/j.1365-2966.2008.14322.x
---------- VANCOUVER ----------
Cichowolski, S., Romero, G.A., Ortega, M.E., Cappa, C.E., Vasquez, J. Unveiling the birth and evolution of the H ii region Sh2-173. Mon. Not. R. Astron. Soc. 2009;394(2):900-915.
http://dx.doi.org/10.1111/j.1365-2966.2008.14322.x