Issue |
A&A
Volume 386, Number 1, April IV 2002
|
|
---|---|---|
Page(s) | 204 - 210 | |
Section | Interstellar and circumstellar matter | |
DOI | https://doi.org/10.1051/0004-6361:20011387 | |
Published online | 15 April 2002 |
Discovery of X-ray emission from the protostellar jet L1551 IRS5 (HH 154)
1
Astrophysics Division – Space Science Department of ESA, ESTEC, Postbus 299, 2200 AG Noordwijk, The Netherlands
2
Osservatorio Astronomico di Palermo, Piazza del Parlamento 1, 90134 Palermo, Italy
3
Nordic Optical Telescope, Apartado 474, 38700 Santa Cruz de la Palma, Canarias, Spain
Corresponding author: F. Favata, Fabio.Favata@rssd.esa.int
Received:
20
July
2001
Accepted:
27
September
2001
We have for the first time detected X-ray emission
associated with a protostellar jet, on the jet emanating from the
L1551 IRS5 protostar. The IRS5 protostar is hidden behind a very
large absorbing column density, making the direct observation of the
jet's emission possible. The observed X-ray emission is likely
associated with the shock “working surface”, i.e. the interface
between the jet and the circumstellar medium. The X-ray luminosity
emanating from the jet is, at
erg s-1, a significant fraction of the luminosity normally associated
with the coronal emission from young stars. The spectrum of the
X-ray emission is compatible with thermal emission from a hot
plasma, with a temperature of
4 MK, higher than the
temperature expected (on the basis of the jet's velocity) for the
shock front produced by the jet hitting the circumstellar medium.
Key words: ISM: clouds / ISM: individual objects: L1551: HH 454 / ISM: jets and outflows / stars: formation / stars: pre-main sequence / radio lines: ISM
© ESO, 2002
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