Issue |
A&A
Volume 510, February 2010
|
|
---|---|---|
Article Number | A96 | |
Number of page(s) | 7 | |
Section | Interstellar and circumstellar matter | |
DOI | https://doi.org/10.1051/0004-6361/200912722 | |
Published online | 17 February 2010 |
A multiwavelength study of the star forming region IRAS 18544+0112
1
Instituto de Astronomía y Física del Espacio (IAFE),
CC 67, Suc. 28, 1428 Buenos Aires, Argentina e-mail: mortega@iafe.uba.ar
2
Departamento de Astronomía, Universidad de Chile, Casilla 36-D,
Santiago, Chile
Received:
18
June
2009
Accepted:
6
November
2009
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 ~15 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.
Key words: ISM: molecules / HII regions / stars: formation
© ESO, 2010
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