2017A&A...606A..68C


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.11CEST19:18:10

2017A&A...606A..68C - Astronomy and Astrophysics, volume 606A, 68-68 (2017/10-1)

Luminous and high-frequency peaked blazars: the origin of the γ-ray emission from PKS 1424+240.

CERRUTI M., BENBOW W., CHEN X., DUMM J.P., FORTSON L.F. and SHAHINYAN K.

Abstract (from CDS):

Context. The current generation of ground-based Cherenkov telescopes, together with the LAT instrument on-board the Fermi satellite, have greatly increased our knowledge of γ-ray blazars. Among them, the high-frequency-peaked BL Lacertae object (HBL) PKS 1424+240 (z~= 0.6) is the farthest persistent emitter of very-high-energy (VHE; E≥100GeV) γ-ray photons. Current emission models can satisfactorily reproduce typical blazar emission assuming that the dominant emission process is synchrotron-self-Compton (SSC) in HBLs; and external-inverse-Compton (EIC) in low-frequency-peaked BL Lacertae objects and flat-spectrum-radio-quasars. Alternatively, hadronic models are also able to correctly reproduce the γ-ray emission from blazars, although they are in general disfavored for bright quasars and rapid flares.
Aims. The blazar PKS 1424+240 is a rare example of a luminous HBL, and we aim to determine which is the emission process most likely responsible for its γ-ray emission. This will impact more generally our comprehension of blazar emission models, and how they are related to the luminosity of the source and the peak frequency of the spectral energy distribution.
Methods. We have investigated different blazar emission models applied to the spectral energy distribution of PKS 1424+240. Among leptonic models, we study a one-zone SSC model (including a systematic study of the parameter space), a two-zone SSC model, and an EIC model. We then investigated a blazar hadronic model, and finally a scenario in which the γ-ray emission is associated with cascades in the line-of-sight produced by cosmic rays from the source.
Results. After a systematic study of the parameter space of the one-zone SSC model, we conclude that this scenario is not compatible with γ-ray observations of PKS 1424+240. A two-zone SSC scenario can alleviate this issue, as well as an EIC solution. For the latter, the external photon field is assumed to be the infra-red radiation from the dusty torus, otherwise the VHE γ-ray emission would have been significantly absorbed. Alternatively, hadronic models can satisfactorily reproduce the γ-ray emission from PKS 1424+240, both as in-source emission and as cascade emission.

Abstract Copyright: © ESO, 2017

Journal keyword(s): relativistic processes - BL Lacertae objects: general - BL Lacertae objects: individual: PKS 1424+240 - astroparticle physics - astroparticle physics

Simbad objects: 9

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Number of rows : 9

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 3FHL J0033.5-1921 BLL 00 33 34.3798818431 -19 21 33.135188391   16.8 16.3 16.6   ~ 86 0
2 QSO B0218+357 QSO 02 21 05.5 +35 56 14   20.0 20.0 19.60   ~ 498 3
3 Mrk 421 BLL 11 04 27.3139210166 +38 12 31.798324828   13.50 12.90 8.31   ~ 2383 1
4 BD+81 395 * 12 17 38.7319546543 +80 46 37.867529522   10.84 10.51     A5 1 0
5 3C 279 QSO 12 56 11.1664521013 -05 47 21.531840471   18.01 17.75 15.87   ~ 2704 2
6 7C 1424+2401 BLL 14 27 00.3918388878 +23 48 00.035406946 14.52 14.34 14.95 14.5   ~ 287 1
7 7C 1441+2514 QSO 14 43 56.89219806 +25 01 44.4907918   19.5   19.7   ~ 99 1
8 QSO B1553+113 BLL 15 55 43.0439413597 +11 11 24.365587666 14.91 14.72 14.57 13.99   ~ 420 1
9 QSO B2155-304 BLL 21 58 52.0651817803 -30 13 32.120657891   13.36 13.09 12.62   ~ 1564 1

    Equat.    Gal    SGal    Ecl

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2020.07.11-19:18:11

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