Issue |
A&A
Volume 616, August 2018
|
|
---|---|---|
Article Number | A65 | |
Number of page(s) | 6 | |
Section | Extragalactic astronomy | |
DOI | https://doi.org/10.1051/0004-6361/201832812 | |
Published online | 17 August 2018 |
The mid-2016 flaring activity of the flat spectrum radio quasar PKS 2023-07
1
INAF-IAPS,
Via del Fosso del Cavaliere 100,
00133
Roma,
Italy
e-mail: giovanni.piano@iaps.inaf.it
2
CIFS, c/o Dipartimento di Fisica, Università di Torino,
Via P. Giuria 1,
10125
Torino,
Italy
3
Unitat de Física de les Radiacions, Departament de Física and CERES-IEEC, Universitat Autónoma de Barcelona,
08193
Bellaterra,
Spain
4
INAF, Osservatorio Astronomico di Brera,
Via E. Bianchi 46,
23807
Merate,
Italy
5
ASI,
Via del Politecnico snc,
00133
Roma,
Italy
6
Space Science Data Center/ASI (SSDC),
Via del Politecnico,
00133
Roma,
Italy
7
INAF-OAR,
Via Frascati 33,
00078
Monte Porzio Catone, Roma,
Italy
8
Instituto Nacional de Astrofisica Optica y Electronica (INAOE),
Apartado Postal 51 y 216,
72000
Puebla,
Mexico
9
Astronomia, Accademia Nazionale dei Lincei,
Via della Lungara 10,
00165
Roma,
Italy
10
Università “Tor Vergata”, Dipartimento di Fisica,
Via della Ricerca Scientifica 1,
00133
Roma,
Italy
11
Gran Sasso Science Institute,
Viale Francesco Crispi 7,
67100
L’Aquila,
Italy
Received:
12
February
2018
Accepted:
12
May
2018
Context. Flat spectrum radio quasars (FSRQs) can suffer strong absorption above E = 25∕(1 + z) GeV, due to gamma–gamma interaction if the emitting region is at sub-parsec scale from the super-massive black hole (SMBH).
Aims. Gamma-ray flares from these astrophysical sources can be used to investigate the location of the high-energy emission region and the physics of the radiating processes.
Methods. We present an episode of remarkable gamma-ray flaring activity from FSRQ PKS 2023-07 during April 2016, as detected by both the AGILE and Fermi satellites. An intensive multiwavelength campaign, triggered by Swift, covered the entire duration of the flaring activity, including the peak gamma-ray activity.
Results. We report the results of multiwavelength observations of the blazar. We found that during the peak emission, the most energetic photon had an energy of 44 GeV, putting strong constraints on the opacity of the gamma-ray dissipation region. The overall spectral energy distribution (SED) is interpreted in terms of leptonic models for blazar jets, with the emission site located beyond the broad line region (BLR).
Key words: galaxies: active / quasars: general / quasars: supermassive black holes
© ESO 2018
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