2008A&A...483....1P


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST20:28:14

2008A&A...483....1P - Astronomy and Astrophysics, volume 483, 1-5 (2008/5-3)

Intergalactic absorption and blazar γ-ray spectra.

PERSIC M. and DE ANGELIS A.

Abstract (from CDS):

The distribution of TeV spectral slopes versus redshift for currently known TeV blazars (16 sources with z≤0.21, and one with z>0.25) is essentially a scatter plot with hardly any hint of a global trend. We suggest that this is the outcome of two combined effects of intergalactic γγ absorption, plus an inherent feature of the SSC (synchro-self-Compton) process of blazar emission. First, flux dimming introduces a bias that favors detection of progressively more flaring sources at higher redshifts. According to mainstream SSC models, more flaring source states imply sources with flatter TeV slopes. This results in a structured relation between intrinsic TeV slope and redshift. The second effect, spectral steepening by intergalactic absorption, affects sources progressively with distance and effectively wipes out the intrinsic slope-redshift correlation.

Abstract Copyright:

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

CDS comments: Table 1 PKS 2344+514 is a misprint for PKS 2344-514. Paragraph.5. 1ES 1101-032 is a probable misprint for 1ES 1101-232.

Simbad objects: 17

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Number of rows : 17

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 2MASX J01523964+0147167 BLL 01 52 39.6108342199 +01 47 17.385034188     15.12 11.8   ~ 106 1
2 QSO B0229+200 BLL 02 32 48.6154943841 +20 17 17.493345304   18.0 18.00     ~ 258 3
3 QSO B0347-121 BLL 03 49 23.1861664460 -11 59 27.368085519   18.74 18.2 17.46   ~ 177 0
4 6C 101157+494057 BLL 10 15 04.1393763275 +49 26 00.708524180   16.56 16.15 14.58   ~ 305 2
5 2A 1058-226 BLL 11 03 37.6150843895 -23 29 31.202114088   17.00 16.55 16.61   ~ 314 2
6 Mrk 421 BLL 11 04 27.3139210166 +38 12 31.798324828   13.50 12.90 8.31   ~ 2381 1
7 6C 113337+702604 BLL 11 36 26.4084430 +70 09 27.307497   15.16 14.49 10.51   ~ 314 1
8 QSO B1218+304 BLL 12 21 21.9427463316 +30 10 37.161573795   16.50 15.85 15.7   ~ 388 1
9 QSO B1426+428 BLL 14 28 32.6090831425 +42 40 21.050020627   16.95 16.45 14.4   ~ 455 2
10 QSO B1553+113 BLL 15 55 43.0439413597 +11 11 24.365587666 14.91 14.72 14.57 13.99   ~ 420 1
11 4C 39.49 BLL 16 53 52.21668494 +39 45 36.6089458 14.09 14.15 13.29 8.26   ~ 1912 2
12 QSO B1959+650 BLL 19 59 59.8525497024 +65 08 54.651170114     12.8 11.21   ~ 500 2
13 QSO B2005-489 BLL 20 09 25.3910622923 -48 49 53.722146927   15.75 12.81 11.41   ~ 510 2
14 QSO B2155-304 BLL 21 58 52.0651817803 -30 13 32.120657891   13.36 13.09 12.62   ~ 1560 1
15 NAME BL Lac BLL 22 02 43.2913773726 +42 16 39.978417860   15.66 14.72     ~ 2006 1
16 QSO B2344-514 QSO 23 47 19.8635686680 -51 10 36.065159085   20.1   21.31   ~ 21 1
17 QSO B2356-309 BLL 23 59 07.9032684889 -30 37 40.667900741   18.414 16.44 16.795   ~ 249 1

    Equat.    Gal    SGal    Ecl

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2020.07.04-20:28:14

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