A gamma-ray flare from TXS 1508+572: characterizing the jet of a z=4.31 blazar in the early Universe
arxiv(2024)
摘要
Blazars can be detected from very large distances due to their high
luminosity. However, the detection of γ-ray emission of blazars beyond
z=3 has only been confirmed for a small number of sources. Such observations
probe the growth of supermassive black holes close to the peak of star
formation in the history of galaxy evolution. As a result from a continuous
monitoring of a sample of 80 z>3 blazars with Fermi-LAT, we present the first
detection of a γ-ray flare from the z=4.31 blazar TXS 1508+572. This
source showed high γ-ray activity from February to August 2022, reaching
a peak luminosity comparable to the most luminous flares ever detected with
Fermi -LAT. We conducted a multiwavelength observing campaign involving
XMM-Newton, Swift, the Effelsberg 100-m radio telescope and the Very Long
Baseline Array. In addition, we make use of the monitoring programs by the
Zwicky Transient Facility and NEOWISE at optical and infrared wavelengths,
respectively. We find that the source is particularly variable in the infrared
band on daily time scales. The spectral energy distribution collected during
our campaign is well described by a one-zone leptonic model, with the
γ-ray flare originating from an increase of external Compton emission as
a result of a fresh injection of accelerated electrons.
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