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Astron. Astrophys. 332, 1055-1063 (1998)

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Near infrared imaging and spectroscopy of the IRAS 20126+4104 region *

S. Ayala 1, S. Curiel 1, A.C. Raga 1, A. Noriega-Crespo 2 and L. Salas 3

1 Instituto de Astronomía, UNAM, Ap. 70-264, 04510 México, D.F., México
2 Infrared Processing and Analysis Center, CalTech-JPL, Pasadena, CA 91125, USA
3 Instituto de Astronomía, UNAM, Ap. 877, 22830 Ensenada, México

Received 22 August 1997 / Accepted 6 January 1998

Abstract

In this paper we present near-infrared images and [FORMULA] -band spectra (1.95-2.30 µm) of the nebulae located in the IRAS 20126+4104 region. We find bright cometary shaped objects to the Northwest of the IRAS position and other emission line objects to the Southeast. We have detected 6 low excitation emission lines of molecular hydrogen, and present spatially resolved excitation temperatures, 1-0 S(1)/2-1 S(1) line ratios and ortho-para ratios for the brighter emission line objects near the IRAS source. The integrated flux in the H2 1-0 S(1) line of the brighter object located to the Northwest of the IRAS position is [FORMULA], integrated within an aperture of [FORMULA]. From a spectrophotometric analysis, we conclude that the H2 emission observed in this nebula is mainly produced by collisional excitation combined with fluorescent H2 emission. However, it is unclear from our observations whether the UV radiation field that would be responsible for the fluorescent component is produced by the IRAS source itself, or by the stars embedded at the Eastern edges of two of the observed condensations.

Key words: ISM: jets and outflows – infrared: ISM: lines and bands – ISM: individual objects: IRAS 20126+4104

* Based on observations obtained at the Observatorio Astronómico Nacional at San Pedro Mártir, B.C. México

Send offprint requests to: S. Ayala (sayala@astroscu.unam.mx)

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© European Southern Observatory (ESO) 1998

Online publication: March 30, 1998
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