EDP Sciences
Free access
Volume 380, Number 1, December II 2001
Page(s) L1 - L4
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:20011503

A&A 380, L1-L4 (2001)
DOI: 10.1051/0004-6361:20011503

Discovery of new embedded Herbig-Haro objects in the $\rho$ Ophiuchi dark cloud

N. Grosso1, J. Alves2, R. Neuhäuser1 and T. Montmerle3

1  Max-Planck-Institut für extraterrestrische Physik, PO Box 1312, 85741 Garching bei München, Germany
2  European Southern Observatory Karl-Schwarzschild-Str. 2, 85748 Garching bei München, Germany
3  Service d'Astrophysique, CEA Saclay, 91191 Gif-sur-Yvette, France

(Received 31 August 2001 / Accepted 9 October 2001 )

We report here the discovery of a 30´´-chain of embedded Herbig-Haro (HH) objects in the $\rho$ Ophiuchi dark cloud. These HH objects were first detected during a deep KS-band observation (completeness magnitude for point source ~19) made with NTT/SOFI. We confirm their nature with follow-up observations made with H2 v=1-0 S(1) narrow-band filter. We argue that they belong to two different jets emanating from two Class I protostars: the main component of the recently resolved subarcsecond radio binary YLW15 (also called IRS43 ), and IRS54 . We propose also to identify the SII knot HH224NW1 (Gómez et al. 1998) as emanating from a counterjet of YLW15. The alignment between these HH objects and the thermal jet candidate found in YLW15 by Girart et al. (2000) implies that this jet is not precessing at least on timescale ~(2-4)$\times$104 yr.

Key words: open clusters and associations: $\rho$ Ophiuchi dark cloud -- infrared: stars -- infrared: ISM -- stars: pre-main sequence -- Herbig-Haro objects -- ISM: jets and outflows

Offprint request: N. Grosso, ngrosso@mpe.mpg.de

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