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Mid-IR images of methanol masers and ultracompact HII regions

Published online by Cambridge University Press:  01 August 2006

Paolo Persi
Affiliation:
INAF/IASF-Roma Via fosso del Cavaliere, 100, oo133 Roma-Italy email: paolo.persi@iasf-roma.inaf.it
Mauricio Tapia
Affiliation:
IA-UNAM Ensenada, Mexico
Anna Rosa Marenzi
Affiliation:
INAF/IASF-Roma Via fosso del Cavaliere, 100, oo133 Roma-Italy email: paolo.persi@iasf-roma.inaf.it
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Methanol masers and UCHII regions trace massive star formation sites. We have undertaken a mid-IR survey of 17 regions containing methanol masers and UCHIIs in order to locate the young stellar sources associated with them. The images were obtained from 8.7 to 18.8 μm with the mid-IR camera CID (Salas et al. 2003) on the 2.1m telescope of the Observatorio Astronomico Nacional at San Pedro Martir (Baja California, Mexico). The images were taken with a scale 0.55″/pix and the mean PSF was 1.5-2.0″(FWHM) close to the diffraction limit. We report as an example in Fig. 1 (left panel) our 18.8μm contours of IRAS 06061+2151 superimposed to the 2MASS Ks image. A young cluster of at least 4 sources has been found centered on the IRAS source (Anandarao et al. 2004). We have found two mid-IR sources coinciding with the source #2 and #4 of Anandarao et al. (2004). The source #4 is at the center of two H2 knots and a high velocity molecular outflow. The mid-IR emission from #2 is extended and coincides with the UCHII and MSX source. The methanol maser is approximately 10″ south of the source #2. The SEDs of both sources are illustrated in Fig. 1 (right panel). The IR spectral indices of source #2 and #4 are α(IR)=1.9 and 2.2 respectively.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2007

References

Anandarao, B.G., Chakraborty, A., Ojha, D.K., & Testi, L. 2004, A&A 421, 1045Google Scholar
Salas, L., Gutierrez, L., Tapia, M. et al. 2003, in: Instrument Design and Performance for Optical/Infrared Telescopes, SPIE Proc. 4941, 594CrossRefGoogle Scholar