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Evidence of non-thermal x-ray emission from HH 80

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López-Santiago, Javier and Peri, C.S. and Bonito, R. and Miceli, M. and Albacete Colombo, J.F. and Benaglia, P. and De Castro, E. (2013) Evidence of non-thermal x-ray emission from HH 80. Astrophysical journal letters, 776 (2). ISSN 2041-8205

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Official URL: http://iopscience.iop.org/2041-8205/776/2/L22




Abstract

Protostellar jets appear at all stages of star formation when the accretion process is still at work. Jets travel at velocities of hundreds of km/s, creating strong shocks when interacting with interstellar medium. Several cases of jets have been detected in X-rays, typically showing soft emission. For the first time, we report evidence of hard X-ray emission possibly related to non-thermal processes not explained by previous models of the post-shock emission predicted in the jet/ambient interaction scenario. HH 80 is located at the south head of the jet associated to the massive protostar IRAS 18162-2048. It shows soft and hard X-ray emission in regions that are spatially separated, with the soft X-ray emission region situated behind the region of hard X-ray emission. We propose a scenario for HH 80 where soft X-ray emission is associated to thermal processes from the interaction of the jet with denser ambient matter and the hard X-ray emission is produced by synchrotron radiation at the front shock.


Item Type:Article
Uncontrolled Keywords:Herbig-Haro objects; ISM: jets and outflows; radiation mechanisms: non-thermal; stars: individual (IRAS 18162-2048); stars: pre-main sequence; X-rays: general
Subjects:Sciences > Mathematics > Astrophysics
Sciences > Mathematics > Astronomy
ID Code:30428
Deposited On:27 May 2015 08:56
Last Modified:27 May 2015 11:59

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