X-ray emission from stellar jets by collision against high-density molecular clouds: an application to HH 248



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López Santiago, J. and Bonito, R. and Orellana, M. and Miceli, M. and Orlando, S. and Ustamujic, S. and Albacete Colombo, J. F. and Castro Rubio, Elisa de and Gómez de Castro, Ana Inés (2015) X-ray emission from stellar jets by collision against high-density molecular clouds: an application to HH 248. Astrophysical journal, 806 (1). ISSN 0004-637X

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Official URL: http://dx.doi.org/10.1088/0004-637X/806/1/53


We investigate the plausibility of detecting X-ray emission from a stellar jet that impacts a dense molecular cloud, a scenario that may be typical for classical T Tauri stars with jets in dense star-forming complexes. We first model the impact of a jet against a dense cloud using two-dimensional axisymmetric hydrodynamic simulations, exploring different configurations of the ambient environment. Then, we compare our results with XMM-Newton observations of the Herbig-Haro object HH 248, where extended X-ray emission aligned with the optical knots is detected at the edge of the nearby IC 434 cloud. Our simulations show that a jet can produce plasma with temperatures up to 10^7 K, consistent with production of X-ray emission, after impacting a dense cloud. We find that jets denser than the ambient medium but less dense than the cloud produce detectable X-ray emission only at impact with the cloud. From an exploration of the model parameter space, we constrain the physical conditions (jet density and velocity and cloud density) that reproduce the intrinsic luminosity and emission measure of the X-ray source possibly associated with HH 248 well. Thus, we suggest that the extended X-ray source close to HH 248 corresponds to a jet impacting a dense cloud.

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© 2015. The American Astronomical Society. The software used in this work was developed in part by the DOE-supported ASC/Alliance Center for Astrophysical Thermonuclear Flashes at the University of Chicago. HST data presented in this paper were obtained from MAST. STScI is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555. Support for MAST for non-HST data is provided by the NASA Office of Space Science via grant NNX13AC07G and by other grants and contracts. This work was supported by the Spanish Government under research projects AYA2011-29754-C03-01 and AYA2011-29754-C03-03. M.O. and J.F.A-C. acknowledge support by the Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET, Argentina). Finally, we thank the referee for useful comments and suggestions.

Uncontrolled Keywords:MHD outflow solutions; T-tauri stars; Protostellar jet; DG-tauri; Radiative knots; 3D simulations; VLA detection; Orion-nebula; Disc winds; Discovery
Subjects:Sciences > Physics > Astrophysics
Sciences > Physics > Astronomy
ID Code:32855
Deposited On:26 Aug 2015 12:55
Last Modified:10 Dec 2018 15:05

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