EDP Sciences
Free access
Volume 421, Number 3, July III 2004
Page(s) 1045 - 1050
Section Interstellar and circumstellar matter
DOI http://dx.doi.org/10.1051/0004-6361:20035748

A&A 421, 1045-1050 (2004)
DOI: 10.1051/0004-6361:20035748

Detection of knots and jets in IRAS 06061+2151

B. G. Anandarao1, A. Chakraborty2, D. K. Ojha3, 4 and L. Testi5

1  Physical Research Laboratory, Ahmedabad-390009, India
2  Department of Astronomy & Astrophysics, 525 Davey Laboratory, Pennsylvania State University, University Park, PA 16802, USA
3  Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai-400005, India
4  National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588, Japan
5  Osservatorio Astrofisico di Arcetri, INAF, Largo E. Fermi 5, 50125 Firenze, Italy

(Received 26 November 2003 / Accepted 15 March 2004)

We report detection of a Young Stellar Object with evidence of outflow in the form of knots in the molecular hydrogen emission line (2.121  $\mu$m) towards the massive star forming region IRAS 06061+2151. Near-infrared images reveal IRAS 06061+2151 to be a cluster of at least five sources, four of which seem to be early B type young stellar objects, in a region of 12 arcsec surrounded by a nebulosity. The presence of the knots that are probably similar to the HH objects in the optical wavelengths suggests emerging jets from one of the cluster members. These jets appear to excite a pair of knot-like objects (Knot-NW and Knot-SE) and extend over a projected size of 0.5 pc. The driving source of the jets is traced back to a member of the cluster whose position in the H-Ks/ J-H color-color diagram indicates that it is a Class I type pre-main sequence star. We also obtained K band spectra of the brightest source in the cluster and of the nearby nebular matter. The spectra show molecular hydrogen emission lines but do not show the Br $\gamma$ line (2.167  $\mu$m). These spectra suggest that the excitation of the molecular hydrogen lines is probably due to a mild shock.

Key words: stars: pre-main sequence -- ISM: jets and outflows -- stars: formation

Offprint request: B. G. Anandarao, anand@prl.ernet.in

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© ESO 2004