2005A&A...444..767Z


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.14CEST07:37:40

2005A&A...444..767Z - Astronomy and Astrophysics, volume 444, 767-775 (2005/12-4)

COMPTEL observations of the γ-ray blazars 3C 454.3 and CTA 102 during the CGRO mission.

ZHANG S., COLLMAR W. and SCHOENFELDER V.

Abstract (from CDS):

We have investigated the MeV behaviour of the γ-ray blazars 3C 454.3 and CTA 102 by analyzing all COMPTEL observations of this sky region during the complete CGRO mission. Both sources are detected by COMPTEL at the upper COMPTEL energies, although their flux estimates may be uncertain by possible minor contributions of nearby unidentified EGRET γ-ray sources. While CTA 102 was only detected at energies above 10 MeV during the early mission, 3C 454.3 is most significantly detected in the COMPTEL 3-10MeV band in the sum of all data. Time-resolved analyses indicate a weak (near COMPTEL threshold) but likely steady 3-10MeV emission over years, being independent of the observed time variability at energies above 100MeV as observed by EGRET. This energy-dependent variability behaviour suggests different emission mechanisms at work in the two bands. Putting the COMPTEL fluxes in multifrequency perspective (radio to γ-rays) reveals for both sources the typical two-hump blazar spectrum, with a low-energy maximum around the IR and a high-energy maximum at MeV energies. The latter one dominates the energy output across the whole electro-magnetic spectrum. The results of our analyses are discussed in the framework of current blazar modeling.

Abstract Copyright:

Journal keyword(s): γ rays: observations - galaxies: active - galaxies: quasars: individual: 3C 454.3, CTA 102

Simbad objects: 13

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Number of rows : 13

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 Mrk 335 Sy1 00 06 19.5371542746 +20 12 10.617456059   14.19 13.85     ~ 1129 0
2 QSO J0530+13 Bla 05 30 56.41672 +13 31 55.1495     20.0 19.35   ~ 895 1
3 3C 273 BLL 12 29 06.6996828061 +02 03 08.598846466   13.05 14.830 14.11   ~ 5419 1
4 3C 279 Bla 12 56 11.1664521013 -05 47 21.531840471   18.01 17.75 15.87   ~ 2765 2
5 PSR J2043+2740 Psr 20 43 43.5 +27 40 56           ~ 98 0
6 GRO J2058+42 HXB 20 58 47.5371693693 +41 46 37.180557326   15.97 14.74 14.74 13.35 O9.5-B0IV-Ve 64 0
7 NAME BL Lac BLL 22 02 43.2913773726 +42 16 39.978417860   15.66 14.72     ~ 2040 1
8 4C 11.69 QSO 22 32 36.40890517 +11 43 50.9040717   17.75 17.33     ~ 1007 2
9 9Y-MST J2246+1544 BLL 22 46 04.985 +15 44 35.39           ~ 37 0
10 3EG J2248+1745 Bla 22 48 57.6 +17 46 12     14.10     ~ 20 0
11 3C 454.3 Bla 22 53 57.74798 +16 08 53.5611   16.57 16.10 15.22   ~ 2565 2
12 3EG J2255+1943 gam 22 56 +19.7     14.90     ~ 10 1
13 NGC 7469 Sy1 23 03 15.674 +08 52 25.28 12.60 13.00 12.34     ~ 1922 3

    Equat.    Gal    SGal    Ecl

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2021.04.14-07:37:40

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