Galaxy group-associated distances to very high energy gamma-ray emitting BL Lacs KUV 00311-1938 and S2 0109+22

Karri I. I. Koljonen; Elina Lindfors; Kari Nilsson; Pekka Heinämäki; Jari K. Kotilainen

doi:10.1093/mnras/stae1512

Galaxy group-associated distances to very high energy gamma-ray emitting BL Lacs KUV 00311-1938 and S2 0109+22

Karri I. I. Koljonen, Elina Lindfors, Kari Nilsson, Pekka Heinämäki, Jari K. Kotilainen

Metsähovi Radio Observatory

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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

Original language	English
Pages (from-to)	5084-5096
Number of pages	13
Journal	Monthly Notices of the Royal Astronomical Society
Volume	531
Issue number	4
DOIs	https://doi.org/10.1093/mnras/stae1512
Publication status	Published - 25 Jun 2024
MoE publication type	A1 Journal article-refereed

Keywords

BL Lacertae objects: general
Galaxies: distances and redshifts
Galaxies: groups: general

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10.1093/mnras/stae1512Licence: CC BY

Galaxy group-associated distances to very high energy gamma-ray emitting BL Lacs KUV 00311-1938 and S2 0109+22Final published version, 6.09 MBLicence: CC BY

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title = "Galaxy group-associated distances to very high energy gamma-ray emitting BL Lacs KUV 00311-1938 and S2 0109+22",

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",

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AU - Koljonen, Karri I. I.

AU - Lindfors, Elina

AU - Nilsson, Kari

AU - Heinämäki, Pekka

AU - Kotilainen, Jari K.

PY - 2024/6/25

Y1 - 2024/6/25

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KW - Galaxies: distances and redshifts

KW - Galaxies: groups: general

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Galaxy group-associated distances to very high energy gamma-ray emitting BL Lacs KUV 00311-1938 and S2 0109+22

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Galaxy group-associated distances to very high energy gamma-ray emitting BL Lacs KUV 00311-1938 and S2 0109+22

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