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Astrophysics > High Energy Astrophysical Phenomena

arXiv:2406.13786 (astro-ph)
[Submitted on 19 Jun 2024]

Title:Galaxy-group-associated distances to Very High Energy gamma-ray emitting BL Lacs KUV 00311-1938 and S2 0109+22

Authors:Karri I. I. Koljonen, Elina Lindfors, Kari Nilsson, Pekka Heinämäki, Jari Kotilainen
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Abstract:Blazars constitute the most numerous source class in the known extragalactic population of very high energy (VHE) gamma-ray sources. However, determining their redshifts is often challenging due to weak or non-existent emission lines in their spectra. This study focuses on two BL Lacs, KUV 00311-1938 and S2 0109+22, where previous attempts at redshift determination have faced difficulties. By combining spectroscopic observations with photometric redshift estimates, we tentatively assign a redshift of z = 0.634 to KUV 00311-1938 and a likely redshift of z = 0.49 to S2 0109+22. Establishing redshift estimates for high-redshift blazars is crucial for understanding extragalactic VHE gamma-ray sources and their interactions with the surrounding universe.
Comments: 11 pages, 8 figures, 3 tables. This article has been accepted for publication in MNRAS published by Oxford University Press on behalf of the Royal Astronomical Society
Subjects: High Energy Astrophysical Phenomena (astro-ph.HE); Astrophysics of Galaxies (astro-ph.GA)
Cite as: arXiv:2406.13786 [astro-ph.HE]
  (or arXiv:2406.13786v1 [astro-ph.HE] for this version)
  https://doi.org/10.48550/arXiv.2406.13786

Submission history

From: Karri Koljonen [view email]
[v1] Wed, 19 Jun 2024 19:17:33 UTC (12,549 KB)
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