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Title: On the Absence of Non-thermal X-Ray Emission around Runaway O Stars

Abstract

Theoretical models predict that the compressed interstellar medium around runaway O stars can produce high-energy non-thermal diffuse emission, in particular, non-thermal X-ray and γ -ray emission. So far, detection of non-thermal X-ray emission was claimed for only one runaway star, AE Aur. We present a search for non-thermal diffuse X-ray emission from bow shocks using archived XMM-Newton observations for a clean sample of six well-determined runaway O stars. We find that none of these objects present diffuse X-ray emission associated with their bow shocks, similarly to previous X-ray studies toward ζ Oph and BD+43°3654. We carefully investigated multi-wavelength observations of AE Aur and could not confirm previous findings of non-thermal X-rays. We conclude that so far there is no clear evidence of non-thermal extended emission in bow shocks around runaway O stars.

Authors:
 [1];  [2];  [3]
  1. Institute of Astronomy and Astrophysics, Academia Sinica (ASIAA), Taipei 10617, Taiwan (China)
  2. Institute for Physics and Astronomy, University of Potsdam, D-14476 Potsdam (Germany)
  3. Department of Physics and Astronomy, East Tennessee State University, Johnson City, TN 37614 (United States)
Publication Date:
OSTI Identifier:
22654503
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 838; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; AUGER ELECTRON SPECTROSCOPY; DETECTION; EMISSION; GAMMA RADIATION; MASS TRANSFER; SHOCK WAVES; SIMULATION; STARS; STELLAR WINDS; WAVELENGTHS; X RADIATION

Citation Formats

Toalá, J. A., Oskinova, L. M., and Ignace, R. On the Absence of Non-thermal X-Ray Emission around Runaway O Stars. United States: N. p., 2017. Web. doi:10.3847/2041-8213/AA667C.
Toalá, J. A., Oskinova, L. M., & Ignace, R. On the Absence of Non-thermal X-Ray Emission around Runaway O Stars. United States. doi:10.3847/2041-8213/AA667C.
Toalá, J. A., Oskinova, L. M., and Ignace, R. Sat . "On the Absence of Non-thermal X-Ray Emission around Runaway O Stars". United States. doi:10.3847/2041-8213/AA667C.
@article{osti_22654503,
title = {On the Absence of Non-thermal X-Ray Emission around Runaway O Stars},
author = {Toalá, J. A. and Oskinova, L. M. and Ignace, R.},
abstractNote = {Theoretical models predict that the compressed interstellar medium around runaway O stars can produce high-energy non-thermal diffuse emission, in particular, non-thermal X-ray and γ -ray emission. So far, detection of non-thermal X-ray emission was claimed for only one runaway star, AE Aur. We present a search for non-thermal diffuse X-ray emission from bow shocks using archived XMM-Newton observations for a clean sample of six well-determined runaway O stars. We find that none of these objects present diffuse X-ray emission associated with their bow shocks, similarly to previous X-ray studies toward ζ Oph and BD+43°3654. We carefully investigated multi-wavelength observations of AE Aur and could not confirm previous findings of non-thermal X-rays. We conclude that so far there is no clear evidence of non-thermal extended emission in bow shocks around runaway O stars.},
doi = {10.3847/2041-8213/AA667C},
journal = {Astrophysical Journal Letters},
number = 2,
volume = 838,
place = {United States},
year = {Sat Apr 01 00:00:00 EDT 2017},
month = {Sat Apr 01 00:00:00 EDT 2017}
}