2015A&A...573A..47S


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.11CET23:36:55

2015A&A...573A..47S - Astronomy and Astrophysics, volume 573A, 47-47 (2015/1-1)

Probing cluster environments of blazars through γγ absorption.

SUSHCH I. and BOETTCHER M.

Abstract (from CDS):

Most blazars are known to be hosted in giant elliptic galaxies, but their cluster environments have not been thoroughly investigated. Cluster environments may contain radiation fields of low-energy photons created by nearby galaxies and/or stars in the intracluster medium that produce diffuse intracluster light. These radiation fields may absorb very high energy γrays (VHE; E>100GeV) and trigger pair cascades with further production of subsequent generations of γrays with lower energies via inverse Compton scattering on surrounding radiation fields leaving a characteristic imprint in the observed spectral shape. The change of the spectral shape of the blazar reflects the properties of its ambient medium. We show, however, that neither intracluster light nor the radiation field of an individual nearby galaxy can cause substantial γγabsorption. Substantial γγabsorption is possible only in the case of multiple, >5, luminous nearby galaxies. This situation is not found in the local Universe, but may be possible at larger redshifts (z>2). Since VHE γ rays from such distances are expected to be strongly absorbed by the extragalactic background light, we consider possible signatures of γ-ray induced pair cascades by calculating the expected GeV flux which appears to be below the Fermi-LAT sensitivity even for ∼10 nearby galaxies.

Abstract Copyright:

Journal keyword(s): radiation mechanisms: non-thermal - BL Lacertae objects: general - BL Lacertae objects: individual: 1ES1440+122 - galaxies: clusters: general

Simbad objects: 7

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Number of rows : 7

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 6C 070609+591309 BLL 07 10 30.0681446132 +59 08 20.369016804   17.38 16.52 15.1   ~ 173 2
2 QSO B0829+047 BLL 08 31 48.8771360822 +04 29 39.086736269   17.10 16.4 14.55   ~ 410 2
3 QSO B1229+6430 BLL 12 31 31.3953946380 +64 14 18.288194641   18.36 17.62 14.3   ~ 121 2
4 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4114 2
5 QSO B1440+122 BLL 14 42 48.276582 +12 00 40.37487   18.34 17.63 15.2   ~ 133 3
6 QSO B1853+671 BLL 18 53 52.0678730731 +67 13 55.017062425     16.4 17.1   ~ 36 1
7 QSO B2356-309 BLL 23 59 07.9032684889 -30 37 40.667900741   18.414 16.44 16.795   ~ 242 1

    Equat.    Gal    SGal    Ecl

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2019.12.11-23:36:55

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