2005A&A...436..763I


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.24CET09:52:05

2005A&A...436..763I - Astronomy and Astrophysics, volume 436, 763-784 (2005/6-4)

Resonant absorption troughs in the gamma-ray spectra of QSO.

IYUDIN A.F., REIMER O., BURWITZ V., GREINER J. and REIMER A.

Abstract (from CDS):

We report the very first evidence of the possible detection of γ-ray resonant absorption along the line of sight towards γ-ray bright quasars (QSOs), like 3C279, 3C273, PKS0528+0134, and BL Lacertae. These detections resulted from the analysis of COMPTEL and EGRET data that were collected either during monitoring campaigns of the Virgo and galactic anticenter regions by the Compton Gamma Ray Observatory (CGRO) or during ToO observations of QSOs flares. We discuss three resonant absorption mechanisms that affect the γ-ray spectrum of point-like sources when crossing the surrounding warm and cold absorbers, as well as the potential of this γ-ray photon absorption method to constrain the abundance of the absorber. We detected two absorbers along the line of sight towards γ-ray bright QSOs, one at the QSO rest frame redshift and another at approximately zero redshift. We tentatively identify the latter with an absorber in the Galactic halo, while the former is undoubtedly caused by photon absorption in the host galaxy of the QSO. We discuss the advantages and drawbacks of this method in studies of absorbers in different astrophysical environments and compare this new method to absorber studies at X-ray or other wavelengths. We applied this γ-ray absorption method to identify a few of the EGRET unidentified (EUID) sources as QSOs, and determine their redshifts.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: quasars: absorption lines - gamma-rays: observations - ISM: general

CDS comments: p.777 IRAS 09014 = IRAS 09104+4109

Simbad objects: 26

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Number of rows : 26

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 NAME Chandra Deep Field-South reg 03 32 28.0 -27 48 30           ~ 1774 1
2 QSO J0530+13 QSO 05 30 56.41672 +13 31 55.1495     20.0 19.35   ~ 876 1
3 V* CM Tau Psr 05 34 31.93830 +22 00 52.1758           F 4739 1
4 M 1 SNR 05 34 31.94 +22 00 52.2           ~ 5520 4
5 NAME Geminga Psr 06 33 54.153 +17 46 12.91           ~ 1075 0
6 NAME Vela Pulsar Psr 08 35 20.65525 -45 10 35.1545           ~ 2026 1
7 NAME Lockman Hole reg 10 45 00.0 +58 00 00           ~ 736 0
8 NGC 3783 Sy1 11 39 01.7095761008 -37 44 19.008597647   12.46 13.43 11.33 12.1 ~ 1458 0
9 PB 3894 Sy1 12 14 17.6737003918 +14 03 13.182526431   14.46 14.19     ~ 730 0
10 3C 273 BLL 12 29 06.6996828061 +02 03 08.598846466   13.05 14.830 14.11   ~ 5265 1
11 NAME Virgo Region reg 12 30.8 +12 23           ~ 118 1
12 NAME Chandra Deep Field-North reg 12 36.8 +62 13           ~ 603 0
13 4C 05.55 QSO 12 51 29.507 +04 46 41.75     20.0     ~ 23 1
14 3C 279 QSO 12 56 11.1664521013 -05 47 21.531840471   18.01 17.75 15.87   ~ 2657 2
15 NGC 4945 Sy2 13 05 27.279 -49 28 04.44   9.31 14.40 7.55   ~ 1236 2
16 NAME Centaurus A Sy2 13 25 27.61509104 -43 01 08.8056025   8.18 6.84 6.66   ~ 3928 3
17 3C 294 rG 14 06 44.00 +34 11 25.0           ~ 216 1
18 NAME Circinus Galaxy Sy2 14 13 09.906 -65 20 20.47   10.89 9.84 10.6 10.0 ~ 980 2
19 NGC 6240 Sy2 16 52 58.861 +02 24 03.55   14.31 13.37     ~ 1453 2
20 2EG J1746-2852 LXB 17 44 33.09 -28 44 27.0           ~ 479 0
21 2CG 359+00 gam 17 45 11 -30 11.9           ~ 87 0
22 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 3324 3
23 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11176 0
24 QSO J2015+371 BLL 20 15 28.72976962 +37 10 59.5148505     21.82 21.4   ~ 236 2
25 QSO B2155-304 BLL 21 58 52.0651817803 -30 13 32.120657891   13.36 13.09 12.62   ~ 1528 1
26 NAME BL Lac BLL 22 02 43.2913773726 +42 16 39.978417860   15.66 14.72     ~ 1981 1

    Equat.    Gal    SGal    Ecl

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2020.01.24-09:52:05

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