A multiwavelength study of the most distant gamma-ray detected BL Lacertae object 4FGL J1219.0+3653 (z = 3.59) - INSPIRE

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A multiwavelength study of the most distant gamma-ray detected BL Lacertae object 4FGL J1219.0+3653 (z = 3.59)

Oct 14, 2024

10 pages

Published in:

JHEAp 44 (2024) 290-299

Published: Oct 16, 2024

e-Print:

2410.10204 [astro-ph.HE]

DOI:

10.1016/j.jheap.2024.10.008 (publication)

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Abstract: (Elsevier B.V.)

BL Lac objects are a class of jetted active galactic nuclei that do not exhibit or have weak emission lines in their optical spectra. Recently, the first γ-ray emitting BL Lac beyond

z = 3

, 4FGL J1219.0 +3653 (hereafter J1219), was identified, i.e., within the first two billion years of the age of the universe. Here we report the results obtained from a detailed broadband study of this peculiar source by analyzing the new ∼58 ksec XMM-Newton and archival observations and reproducing the multiwavelength spectral energy distribution with the conventional one-zone leptonic radiative model. The XMM-Newton data revealed that J1219 is a faint X-ray emitter (

F_{0.3 - 10 keV} = {1.02}_{- 0.24}^{+ 0.47} \times 10^{- 15}

erg {cm}^{- 2} s^{- 1}

) and exhibits a soft spectrum (0.3−10 keV photon index

= {2.28}_{- 0.46}^{+ 0.58}

). By comparing the broadband physical properties of J1219 with

z > 3

γ-ray detected flat spectrum radio quasars (FSRQs), we have found that it has a relatively low jet power and, similar to FSRQs, the jet power is larger than the accretion disk luminosity. We conclude that deeper multiwavelength observations will be needed to fully explore the physical properties of this unique high-redshift BL Lac object.

Note:

JHEAP, in press

Methods: data analysis
Gamma rays: general
Galaxies: active
Galaxies: jets
BL Lacertae objects: general

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