Non-thermal processes in the bow shocks of hyper-velocity stars
Runaway stars move at supersonic speed with respect to their surrounding medium. Such stars generate bow shocks in the interstellar gas as they propagate. These bow shocks are usually studied by means of the infrared radiation and the optical emission lines produced by the forward shock. However, bo...
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2021
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| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/176785 |
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I19-R120-10915-1767852025-02-20T20:03:31Z http://sedici.unlp.edu.ar/handle/10915/176785 Non-thermal processes in the bow shocks of hyper-velocity stars Martínez, Javier Rodrigo Palacio, Santiago del Romero, Gustavo Esteban 2021 2025-02-20T18:13:51Z en Ciencias Astronómicas radiation mechanisms: non-thermal shock waves acceleration of particles Runaway stars move at supersonic speed with respect to their surrounding medium. Such stars generate bow shocks in the interstellar gas as they propagate. These bow shocks are usually studied by means of the infrared radiation and the optical emission lines produced by the forward shock. However, bow shocks can also accelerate particles up to relativistic energies, which in turn produce broadband non-thermal emission. This radiation has been investigated in the reverse shocks of runaway stars with velocities of < 100 kms-1. In this work, we expand the research to the case of hyper-velocity stars with speeds reaching thousands of km s-1. We analyze their potential as particle accelerators and non-thermal radiation sources. In particular, we show that non-thermal processes are relevant in both the reverse and forward shocks. We estimate the broadband spectra and assess their detectability as a function of different parameters such as their spectral type, spatial velocity, and the medium density. Las llamadas “estrellas fugitivas” se mueven con velocidades supersónicas respecto al medio que las rodea, generando a su paso ondas de choque en el gas interestelar. Estos objetos han sido mayoritariamente estudiados mediante la emisión infrarroja y las líneas espectrales ópticas producidas por el choque delantero. Sin embargo, los choques de propagación también pueden acelerar partículas relativistas y producir emisión no térmica a diferentes frecuencias. Esta radiación ha sido investigada en los choques reversos de estrellas fugitivas “normales”, con velocidades < 100 kms-1. En este trabajo expandimos la investigación al caso de estrellas de hiper-velocidad que alcanzan velocidades de miles de km s-1. Analizamos su potencial como aceleradores de partículas y como fuentes de radiación no térmica. En particular, mostramos que los procesos no térmicos son relevantes en ambos choques, el reverso y el delantero. Calculamos su emisión multifrecuencia y evaluamos su detectabilidad en función de distintos parámetros, como el tipo espectral de la estrella, la velocidad espacial, y la densidad del medio. Asociación Argentina de Astronomía Articulo Articulo http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) application/pdf 274-276 |
| institution |
Universidad Nacional de La Plata |
| institution_str |
I-19 |
| repository_str |
R-120 |
| collection |
SEDICI (UNLP) |
| language |
Inglés |
| topic |
Ciencias Astronómicas radiation mechanisms: non-thermal shock waves acceleration of particles |
| spellingShingle |
Ciencias Astronómicas radiation mechanisms: non-thermal shock waves acceleration of particles Martínez, Javier Rodrigo Palacio, Santiago del Romero, Gustavo Esteban Non-thermal processes in the bow shocks of hyper-velocity stars |
| topic_facet |
Ciencias Astronómicas radiation mechanisms: non-thermal shock waves acceleration of particles |
| description |
Runaway stars move at supersonic speed with respect to their surrounding medium. Such stars generate bow shocks in the interstellar gas as they propagate. These bow shocks are usually studied by means of the infrared radiation and the optical emission lines produced by the forward shock. However, bow shocks can also accelerate particles up to relativistic energies, which in turn produce broadband non-thermal emission. This radiation has been investigated in the reverse shocks of runaway stars with velocities of < 100 kms-1. In this work, we expand the research to the case of hyper-velocity stars with speeds reaching thousands of km s-1. We analyze their potential as particle accelerators and non-thermal radiation sources. In particular, we show that non-thermal processes are relevant in both the reverse and forward shocks. We estimate the broadband spectra and assess their detectability as a function of different parameters such as their spectral type, spatial velocity, and the medium density. |
| format |
Articulo Articulo |
| author |
Martínez, Javier Rodrigo Palacio, Santiago del Romero, Gustavo Esteban |
| author_facet |
Martínez, Javier Rodrigo Palacio, Santiago del Romero, Gustavo Esteban |
| author_sort |
Martínez, Javier Rodrigo |
| title |
Non-thermal processes in the bow shocks of hyper-velocity stars |
| title_short |
Non-thermal processes in the bow shocks of hyper-velocity stars |
| title_full |
Non-thermal processes in the bow shocks of hyper-velocity stars |
| title_fullStr |
Non-thermal processes in the bow shocks of hyper-velocity stars |
| title_full_unstemmed |
Non-thermal processes in the bow shocks of hyper-velocity stars |
| title_sort |
non-thermal processes in the bow shocks of hyper-velocity stars |
| publishDate |
2021 |
| url |
http://sedici.unlp.edu.ar/handle/10915/176785 |
| work_keys_str_mv |
AT martinezjavierrodrigo nonthermalprocessesinthebowshocksofhypervelocitystars AT palaciosantiagodel nonthermalprocessesinthebowshocksofhypervelocitystars AT romerogustavoesteban nonthermalprocessesinthebowshocksofhypervelocitystars |
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1847925283436363776 |