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Ortega, M.E.; Paron, S.; Cichowolski, S.; Rubio, M.; Castelletti, G.; Dubner, G. "A multiwavelength study of the star forming region IRAS 18544+0112" (2010) Astronomy and Astrophysics. 510(1)
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Abstract:

Aims: This work aims at investigating the molecular and infrared components in the massive young stellar object (MYSO) candidate IRAS 18544+0112. The purpose is to determine the nature and the origin of this infrared source. Methods: To analyze the molecular gas towards IRAS 18544+0112, we have carried out observations in a 90″ × 90″ region around l = 34.°69, b = -0.°65, using the Atacama Submillimeter Telescope Experiment (ASTE) in the 12CO J = 3-2, 13CO J = 3-2, HCO + J = 4-3 and CS J = 7-6 lines with an angular resolution of 22″. The infrared emission in the area has been analyzed using 2MASS and Spitzer public data. Results: From the molecular analysis, we find self-absorbed 12CO J = 3-2 profiles, which are typical in star forming regions, but we do not find any evidence of outflow activity. Moreover, we do not detect either HCO +J = 4-3 or CS J = 7-6 in the region, which are species normally enhanced in molecular outflows and high density envelopes. The 12CO J = 3-2 emission profile suggests the presence of expanding gas in the region. The Spitzer images reveal that the infrared source has a conspicuous extended emission bright at 8 μm with an evident shell-like morphology of ∼1.′5 in size (∼1.4 pc at the proposed distance of 3 kpc) that encircles the 24 μm emission. The non-detection of ionized gas related to IRAS 18544+0112 together with the fact that it is still embedded in a molecular clump suggest that IRAS 18544+0112 has not reached the UCHII region stage yet. Based on near infrared photometry we search for YSO candidates in the region and propose that 2MASS 18565878+0116233 is the infrared point source associated with IRAS 18544+0112. Finally, we suggest that the expansion of a larger nearby HII region, G034.8-0.7, might be related to the formation of IRAS 18544+0112. © 2010 ESO.

Registro:

Documento: Artículo
Título:A multiwavelength study of the star forming region IRAS 18544+0112
Autor:Ortega, M.E.; Paron, S.; Cichowolski, S.; Rubio, M.; Castelletti, G.; Dubner, G.
Filiación:Instituto de Astronomía y Física Del Espacio (IAFE), CC 67, Suc. 28, 1428 Buenos Aires, Argentina
Departamento de Astronomía, Universidad de Chile, Casilla 36-D, Santiago, Chile
Palabras clave:HII regions; ISM: molecules; Stars: formation; Angular resolution; Atacama; Emission profile; H II regions; High density; Infrared components; Infrared emissions; Infrared source; Ionized gas; ISM: molecules; Molecular analysis; Molecular clumps; Molecular gas; Molecular outflows; Multi-wavelength study; Near-infrared photometry; Non-detection; Point sources; Public data; Spitzer; Star-forming region; Stars: formation; Submillimeters; Young stellar objects; Ionization of gases; Light sources; Molecules; Stars
Año:2010
Volumen:510
Número:1
DOI: http://dx.doi.org/10.1051/0004-6361/200912722
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_v510_n1_p_Ortega

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Citas:

---------- APA ----------
Ortega, M.E., Paron, S., Cichowolski, S., Rubio, M., Castelletti, G. & Dubner, G. (2010) . A multiwavelength study of the star forming region IRAS 18544+0112. Astronomy and Astrophysics, 510(1).
http://dx.doi.org/10.1051/0004-6361/200912722
---------- CHICAGO ----------
Ortega, M.E., Paron, S., Cichowolski, S., Rubio, M., Castelletti, G., Dubner, G. "A multiwavelength study of the star forming region IRAS 18544+0112" . Astronomy and Astrophysics 510, no. 1 (2010).
http://dx.doi.org/10.1051/0004-6361/200912722
---------- MLA ----------
Ortega, M.E., Paron, S., Cichowolski, S., Rubio, M., Castelletti, G., Dubner, G. "A multiwavelength study of the star forming region IRAS 18544+0112" . Astronomy and Astrophysics, vol. 510, no. 1, 2010.
http://dx.doi.org/10.1051/0004-6361/200912722
---------- VANCOUVER ----------
Ortega, M.E., Paron, S., Cichowolski, S., Rubio, M., Castelletti, G., Dubner, G. A multiwavelength study of the star forming region IRAS 18544+0112. Astron. Astrophys. 2010;510(1).
http://dx.doi.org/10.1051/0004-6361/200912722