2014ApJ...795...91S


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.20CET09:14:52

2014ApJ...795...91S - Astrophys. J., 795, 91 (2014/November-1)

Estimation of the extragalactic background light using TeV observations of BL Lac objects.

SINHA A., SAHAYANATHAN S., MISRA R., GODAMBE S. and ACHARYA B.S.

Abstract (from CDS):

The very high-energy (VHE) gamma-ray spectral index of high-energy peaked blazars correlates strongly with its corresponding redshift, whereas no such correlation is observed in the X-ray or GeV bands. We attribute this correlation to photon-photon absorption of TeV photons with the extragalactic background light (EBL), and utilizing this we compute the allowed flux range for the EBL, which is independent of previous estimates. The observed VHE spectrum of the sources in our sample can be well approximated by a power law, and if the de-absorbed spectrum is also assumed to be a power law, then we show that the spectral shape of EBL will be εn(ε) ∼ klog (ε/εp). We estimate the range of values for the parameters defining the EBL spectrum, k and εp, such that the correlation of the intrinsic VHE spectrum with redshift is nullified. The estimated EBL depends only on the observed correlation and the assumption of a power-law source spectrum. Specifically, it does not depend on the spectral modeling or radiative mechanism of the sources or on any theoretical shape of the EBL spectrum obtained through cosmological calculations. The estimated EBL spectrum is consistent with the upper and lower limits imposed by different observations. Moreover, it also agrees closely with the theoretical estimates obtained through cosmological evolution models.

Abstract Copyright:

Journal keyword(s): BL Lacertae objects: general - cosmic background radiation - galaxies: active - gamma rays: general - infrared: diffuse background

Simbad objects: 35

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Number of rows : 35

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 J00135605-1854066 BLL 00 13 56.0424516573 -18 54 06.713080197   17.01   15.82   ~ 47 0
2 2MASX J01523964+0147167 BLL 01 52 39.6108342199 +01 47 17.385034188     15.12 11.8   ~ 104 1
3 QSO B0229+200 BLL 02 32 48.6154943841 +20 17 17.493345304   18.0 18.00     ~ 245 3
4 QSO B0301-243 BLL 03 03 26.5029737074 -24 07 11.423823772   16.55 16.18     ~ 156 1
5 IC 310 rG 03 16 42.9787725062 +41 19 29.629862447   14.3       ~ 220 2
6 QSO B0317+18 BLL 03 19 51.8081953152 +18 45 34.570122144     18.12     ~ 183 0
7 QSO B0347-121 BLL 03 49 23.1861664460 -11 59 27.368085519   18.74 18.2 17.46   ~ 169 0
8 QSO B0414+009 BLL 04 16 52.4945787354 +01 05 23.896410061   16.86 16.38 16   ~ 236 0
9 6dFGS gJ044924.7-435009 BLL 04 49 24.700 -43 50 08.93 14.95 17.52 15.24 16.27   ~ 120 1
10 QSO B0502+675 BLL 05 07 56.1461168342 +67 37 24.302255568     17.0 17.2   ~ 138 1
11 QSO B0548-322 BLL 05 50 40.5706739558 -32 16 16.488658537   16.07 15.5     ~ 358 1
12 87GB 064555.8+152016 BLL 06 48 47.6489790744 +15 16 24.797273299       16.2   ~ 58 0
13 6C 070609+591309 BLL 07 10 30.0681446132 +59 08 20.369016804   17.38 16.52 15.1   ~ 172 2
14 7C 080602.89+522749.00 BLL 08 09 49.1866520010 +52 18 58.249265842   16.11 15.59 14.6   ~ 219 2
15 6dFGS gJ101016.0-311909 BLL 10 10 15.9792894823 -31 19 08.412379100   17.61   16.09   ~ 57 0
16 6C 101157+494057 BLL 10 15 04.1393763275 +49 26 00.708524180   16.56 16.15 14.58   ~ 293 2
17 2A 1058-226 BLL 11 03 37.6150843895 -23 29 31.202114088   17.00 16.55 16.61   ~ 302 2
18 Mrk 421 BLL 11 04 27.3139210166 +38 12 31.798324828   13.50 12.90 8.31   ~ 2331 1
19 6C 113337+702604 BLL 11 36 26.4093954222 +70 09 27.311486691   15.16 14.49 10.51   ~ 308 1
20 QSO B1218+304 BLL 12 21 21.9427463316 +30 10 37.161573795   16.50 15.85 15.7   ~ 377 1
21 3C 279 QSO 12 56 11.1664521013 -05 47 21.531840471   18.01 17.75 15.87   ~ 2637 2
22 2MASX J13150336-4236500 BLL 13 15 03.3899187349 -42 36 49.750831008   18.07 16.6 16.59   ~ 79 0
23 7C 1424+2401 BLL 14 27 00.3918388878 +23 48 00.035406946 14.52 14.34 14.95 14.5   ~ 276 1
24 QSO B1426+428 BLL 14 28 32.6090831425 +42 40 21.050020627   16.95 16.45 14.4   ~ 447 2
25 QSO B1440+122 BLL 14 42 48.276582 +12 00 40.37487   18.34 17.63 15.2   ~ 133 3
26 QSO B1553+113 BLL 15 55 43.0439413597 +11 11 24.365587666 14.91 14.72 14.57 13.99   ~ 396 1
27 4C 39.49 BLL 16 53 52.21668494 +39 45 36.6089458 14.09 14.15 13.29 8.26   ~ 1876 2
28 6C 172704+501607 BLL 17 28 18.6239898055 +50 13 10.472390025   16.55 15.97 12.95   ~ 312 1
29 2FHL J1944.1+2117 AG? 19 43 56.200 +21 18 22.95           ~ 54 1
30 QSO B1959+650 BLL 19 59 59.8525497024 +65 08 54.651170114     12.8 11.21   ~ 485 2
31 QSO B2005-489 BLL 20 09 25.3910622923 -48 49 53.722146927   15.75 12.81 11.41   ~ 500 2
32 QSO B2155-304 BLL 21 58 52.0651817803 -30 13 32.120657891   13.36 13.09 12.62   ~ 1520 1
33 2MASX J22500577+3824371 BLL 22 50 05.7480525271 +38 24 37.195160708     16.00 14.8   ~ 94 1
34 QSO B2344+514 BLL 23 47 04.8376303689 +51 42 17.875387216     15.50 10.7   ~ 375 0
35 QSO B2356-309 BLL 23 59 07.9032684889 -30 37 40.667900741   18.414 16.44 16.795   ~ 241 1

    Equat.    Gal    SGal    Ecl

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2019.11.20-09:14:52

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