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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 Castro Rubio, Elisa de (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://dx.doi.org/10.1088/2041-8205/776/2/L22


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http://iopscience.iop.org/Publisher


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^-1, creating strong shocks when interacting with the 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 with 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 with thermal processes from the interaction of the jet with denser ambient matter and hard X-ray emission is produced by synchrotron radiation at the front shock.


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Additional Information:

© 2013. The American Astronomical Society.
This work was supported by the Spanish Government (AYA2011-29754-C03-01 and AYA2011-29754-C03-03). C. S. P. was supported by the COSPAR Capacity Building Workshop Fellowship Program and the Universidad Nacional de La Plata to develop this work at the Universidad Complutense de Madrid. M. M. is supported through the ASI-INAF contract I/009/10/0. JFAC is a staff researcher of the CONICET and acknowledges support by grant PIP 2011 0100285. J.L.-S. would like to thank Drs. F. J. Carrera, P. G. Pérez González and S. Mateos for fruitful discussion on the spectral X-ray emission properties of AGN. We also acknowledges the referee of this manuscript for their suggestions and comments. Facilities: XMM-Newton (EPIC), Chandra (ACIS), Spitzer (IRAC, MIPS).

Uncontrolled Keywords:Protostellar jet HH-154; Photon imaging camera; XMM-Newton; Massive protostars; Radiative knots; Orion-nebula; DG-Tauri; Discovery; Star; Ultraviolet
Subjects:Sciences > Physics > Astrophysics
Sciences > Physics > Astronomy
ID Code:30999
Deposited On:22 Jun 2015 14:49
Last Modified:10 Dec 2018 15:05

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