EDP Sciences
Free access
Volume 389, Number 3, July III 2002
Page(s) 1015 - 1019
Section Diffuse matter in space
DOI http://dx.doi.org/10.1051/0004-6361:20020628

A&A 389, 1015-1019 (2002)
DOI: 10.1051/0004-6361:20020628

Near infrared molecular hydrogen emission in the NGC 2264 IRS1 region

H. Wang1, 2, J. Yang1, 2, M. Wang1, 2 and J. Yan1, 2

1  Purple Mountain Observatory, Academia Sinica, Nanjing 210008, PR China
    e-mail: jiyang@pmo.ac.cn; mwang@pmo.ac.cn; yanjun@pmo.ac.cn
2  Chinese National Astronomical Observatories, Chinese Academy of Sciences, A20 Datun Road, Chaoyang District, Beijing 100012, PR China

(Received 22 January 2002 / Accepted 19 April 2002 )

Molecular hydrogen $v= 1-0\,S(1)$ narrow band imaging revealed a cluster of 4, or probably 5, highly collimated H 2 emission jets and many isolated H 2 emission knots in the NGC 2264 IRS1 region. Jets 1 and 2 each consists of 1 bright and 2 faint knots. Jet 2 is shifted towards northeast relative to jet 1, therefore, they are probably two distinct flows. Jet 3 is a short jet and jet 4 consists of 1 bright knot and several faint knots. Knots I-K may constitute the fifth jet in the region. The relationship between these infrared outflows and the millimeter and submillimeter sources in the region, NGC 2264 MMS1-5, is discussed. Our detection of infrared outflows suggests that MMS1-5 are all in the protostar stage of their evolution. The high collimation of jets 1-4 may have important implication for the formation of intermediate and high mass stars.

Key words: ISM: jets and outflows -- ISM: individual objects: NGC 2264 -- stars: formation

Offprint request: H. Wang, hcwang@pmo.ac.cn

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