Can Supernovae from Runaway Stars Mimic the Signs of Absorbing “Supervirial” Gas?
The recent detection of large column density absorption lines from highly ionized gas in a few directions through the circumgalactic medium (CGM) of the Milky Way (MW) has been puzzling. The inferred temperature from these absorption lines far exceeds the virial temperature of the MW, and the column...
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IOP Publishing
2024-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/ad77be |
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| author | Mukesh Singh Bisht Projjwal Banerjee Biman B. Nath Yuri Shchekinov |
| author_facet | Mukesh Singh Bisht Projjwal Banerjee Biman B. Nath Yuri Shchekinov |
| author_sort | Mukesh Singh Bisht |
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| description | The recent detection of large column density absorption lines from highly ionized gas in a few directions through the circumgalactic medium (CGM) of the Milky Way (MW) has been puzzling. The inferred temperature from these absorption lines far exceeds the virial temperature of the MW, and the column densities are also too large to be easily explained. In this paper, we propose a novel idea to explain these observations and claim that they may not have originated from the CGM, but from a totally different type of source, namely, stellar ejecta from supernovae (SNe) above the Galactic disk that happen to lie in the line of sight to the background quasars. About ∼20% of massive OB stars (progenitors of core-collapse supernovae) are known to be runaway stars that have high ejection velocities near the Galactic plane and can end up exploding as SNe above the Galactic disk. We show that the associated reverse shock in the supernova remnant in the early nonradiative phase can heat the ejecta to temperatures of ≳10 ^7 K and can naturally explain the observed high column density of ions in the observed “supervirial” phase along with α -enriched supersolar abundance that is typical of core-collapse supernovae. However, SNe from runaway stars has a covering fraction of ≲0.7% and thus can only explain the observations along limited sightlines. |
| format | Article |
| id | doaj-art-a892537d0a564aa9b673f225d867e4c3 |
| institution | OA Journals |
| issn | 1538-4357 |
| language | English |
| publishDate | 2024-01-01 |
| publisher | IOP Publishing |
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| series | The Astrophysical Journal |
| spelling | doaj-art-a892537d0a564aa9b673f225d867e4c32025-08-20T01:54:16ZengIOP PublishingThe Astrophysical Journal1538-43572024-01-0197512610.3847/1538-4357/ad77beCan Supernovae from Runaway Stars Mimic the Signs of Absorbing “Supervirial” Gas?Mukesh Singh Bisht0https://orcid.org/0000-0002-1497-4645Projjwal Banerjee1https://orcid.org/0000-0002-6389-2697Biman B. Nath2https://orcid.org/0000-0003-1922-9406Yuri Shchekinov3https://orcid.org/0000-0002-3463-7339Raman Research Institute Bengaluru —560080, IndiaDepartment of Physics, Indian Institute of Technology Palakkad , Kerala, IndiaRaman Research Institute Bengaluru —560080, IndiaRaman Research Institute Bengaluru —560080, IndiaThe recent detection of large column density absorption lines from highly ionized gas in a few directions through the circumgalactic medium (CGM) of the Milky Way (MW) has been puzzling. The inferred temperature from these absorption lines far exceeds the virial temperature of the MW, and the column densities are also too large to be easily explained. In this paper, we propose a novel idea to explain these observations and claim that they may not have originated from the CGM, but from a totally different type of source, namely, stellar ejecta from supernovae (SNe) above the Galactic disk that happen to lie in the line of sight to the background quasars. About ∼20% of massive OB stars (progenitors of core-collapse supernovae) are known to be runaway stars that have high ejection velocities near the Galactic plane and can end up exploding as SNe above the Galactic disk. We show that the associated reverse shock in the supernova remnant in the early nonradiative phase can heat the ejecta to temperatures of ≳10 ^7 K and can naturally explain the observed high column density of ions in the observed “supervirial” phase along with α -enriched supersolar abundance that is typical of core-collapse supernovae. However, SNe from runaway stars has a covering fraction of ≲0.7% and thus can only explain the observations along limited sightlines.https://doi.org/10.3847/1538-4357/ad77beCircumgalactic mediumSupernova remnantsRunaway starsHalo starsMilky Way Galaxy |
| spellingShingle | Mukesh Singh Bisht Projjwal Banerjee Biman B. Nath Yuri Shchekinov Can Supernovae from Runaway Stars Mimic the Signs of Absorbing “Supervirial” Gas? The Astrophysical Journal Circumgalactic medium Supernova remnants Runaway stars Halo stars Milky Way Galaxy |
| title | Can Supernovae from Runaway Stars Mimic the Signs of Absorbing “Supervirial” Gas? |
| title_full | Can Supernovae from Runaway Stars Mimic the Signs of Absorbing “Supervirial” Gas? |
| title_fullStr | Can Supernovae from Runaway Stars Mimic the Signs of Absorbing “Supervirial” Gas? |
| title_full_unstemmed | Can Supernovae from Runaway Stars Mimic the Signs of Absorbing “Supervirial” Gas? |
| title_short | Can Supernovae from Runaway Stars Mimic the Signs of Absorbing “Supervirial” Gas? |
| title_sort | can supernovae from runaway stars mimic the signs of absorbing supervirial gas |
| topic | Circumgalactic medium Supernova remnants Runaway stars Halo stars Milky Way Galaxy |
| url | https://doi.org/10.3847/1538-4357/ad77be |
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