2008A&A...479...41K


C.D.S. - SIMBAD4 rel 1.7 - 2020.04.01CEST23:04:33

2008A&A...479...41K - Astronomy and Astrophysics, volume 479, 41-47 (2008/2-3)

BL Lacertae contribution to the extragalactic gamma-ray background.

KNEISKE T.M. and MANNHEIM K.

Abstract (from CDS):

Very high energy gamma-rays from blazars traversing cosmological distances through the metagalactic radiation field can convert into electron-positron pairs in photon-photon collisions. The converted gamma-rays initiate electromagnetic cascades driven by inverse-Compton scattering off the microwave background photons. Using a model for the time-dependent metagalactic radiation field consistent with all currently available far-infrared-to-optical data, we calculate the cascade contribution from faint, unresolved high- and low-peaked blazars to the extragalactic gamma-ray background as measured by EGRET. For low-peaked blazars, we adopt a spectral index consistent with the mean spectral index of EGRET detected blazars, and the EGRET luminosity function. For high-peaked blazars, we adopt template spectra matching prototype sources observed with air-Cherenkov telescopes up to 30TeV, and a luminosity function based on X-ray measurements. The low number of ∼20 for nearby high-peaked blazars with a flux exceeding 10–11/cm2/s above 300GeV inferred from the luminosity function is consistent with the results from air-Cherenkov telescope observations. Including the cascade emission from higher redshifts, the total high-peaked blazar contribution to the observed gamma-ray background at GeV energies can account for ∼30%.

Abstract Copyright:

Journal keyword(s): galaxies: BL Lacertae objects: general - cosmology: diffuse radiation - gamma rays: observations

Status at CDS:  

CDS comments: Paragraph 4.1 1ES 1995+650 is a misprint for 1ES 1959+650.

Simbad objects: 9

goto Full paper

goto View the reference in ADS

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 Mrk 421 BLL 11 04 27.3139210166 +38 12 31.798324828   13.50 12.90 8.31   ~ 2356 1
2 M 87 BiC 12 30 49.42338230 +12 23 28.0438581 10.16 9.59 8.63   7.49 ~ 6119 3
3 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4166 2
4 QSO B1426+428 BLL 14 28 32.6090831425 +42 40 21.050020627   16.95 16.45 14.4   ~ 451 2
5 4C 39.49 BLL 16 53 52.21668494 +39 45 36.6089458 14.09 14.15 13.29 8.26   ~ 1899 2
6 QSO B1959+650 BLL 19 59 59.8525497024 +65 08 54.651170114     12.8 11.21   ~ 494 2
7 QSO B2005-489 BLL 20 09 25.3910622923 -48 49 53.722146927   15.75 12.81 11.41   ~ 505 2
8 QSO B2155-304 BLL 21 58 52.0651817803 -30 13 32.120657891   13.36 13.09 12.62   ~ 1542 1
9 NAME Gould Belt PoG ~ ~           ~ 702 1

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2008A&A...479...41K and select 'bookmark this link' or equivalent in the popup menu


2020.04.01-23:04:33

© Université de Strasbourg/CNRS

    • Contact