2004A&A...421..983Z


C.D.S. - SIMBAD4 rel 1.7 - 2020.12.03CET13:23:01

2004A&A...421..983Z - Astronomy and Astrophysics, volume 421, 983-990 (2004/7-3)

Spectral constraints on unidentified EGRET gamma-ray sources from COMPTEL MeV observations.

ZHANG S., COLLMAR W., HERMSEN W. and SCHOENFELDER V.

Abstract (from CDS):

We investigated the MeV properties of 173 unidentified or tentatively identified EGRET sources listed in the third EGRET catalogue by analyzing the simultaneously collected COMPTEL MeV data for each individual source. The sources can be divided into 4 groups. In this paper we focus on one of these, a group of 22 EGRET sources for which we can provide additional constraining information: their spectral extrapolations from the energy range above 100MeV towards lower energies overshoot the fluxes or upper limits derived simultaneously at MeV energies. This means that for these sources a spectral turnover/break between 1 MeV and 100 MeV is required. At least two of these sources, but most likely the majority of this sample, have the maxima of their gamma-ray luminosities in this energy band. The sources have rather soft EGRET spectra (average photon index =2.72+0.08–0.11), and seem to spatially cluster in the inner Galaxy. Variability analyses revealed 11 out of the 22 sources to be significantly variable. Object classes proposed as possible counterparts for the unidentified EGRET sources are discussed in the light of these additional constraints.

Abstract Copyright:

Journal keyword(s): γ-rays: observations

CDS comments: 3EG J1638-5515 is a misprint for 3EG J1638-5155.

Simbad objects: 39

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Number of rows : 39

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 PSR J0218+42 Psr 02 18 06.3604 +42 32 17.365           ~ 299 2
2 3EG J0429+0337 gam 04 30 +03.6           ~ 8 0
3 2EG J0520+2626 gam 05 20 14 +26 32.6           ~ 18 0
4 QSO J0530+13 QSO 05 30 56.41672 +13 31 55.1495     20.0 19.35   ~ 885 1
5 V* CM Tau Psr 05 34 31.93830 +22 00 52.1758           ~ 4841 1
6 M 1 SNR 05 34 31.94 +22 00 52.2           ~ 5674 4
7 HD 245770 HXB 05 38 54.5749436467 +26 18 56.839215267 9.30 9.84 9.39 8.77 8.30 O9/B0III/Ve 880 0
8 PSR B0540-69 Psr 05 40 10.84 -69 19 54.2           ~ 804 3
9 GRO J0544+39 gam 05 46 +39.8           ~ 14 0
10 NAME Geminga Psr 06 33 54.153 +17 46 12.91           ~ 1099 0
11 PSR B0656+14 Psr 06 59 48.183 +14 14 21.54   24.85 24.90     ~ 767 1
12 NAME Vela Pulsar Psr 08 35 20.65525 -45 10 35.1545           ~ 2082 1
13 PSR B1055-52 Psr 10 57 58.970 -52 26 56.52           ~ 683 0
14 V* V779 Cen HXB 11 21 15.0920367078 -60 37 25.627505233   14.4       O9III/Veq 999 0
15 3C 273 BLL 12 29 06.6996828061 +02 03 08.598846466   13.05 14.830 14.11   ~ 5369 1
16 3C 279 QSO 12 56 11.1664521013 -05 47 21.531840471   18.01 17.75 15.87   ~ 2734 2
17 2FGL J1304.3-4353 BLL 13 04 21.0058121281 -43 53 10.200297624 16.09 15.84 15.71     ~ 50 0
18 9Y-MST J1423+3738 BLL 14 23 04.6145864829 +37 37 30.569956148   19.08 18.66 18.3   ~ 36 1
19 QSO J1457-3539 BLL 14 57 26.71171326 -35 39 09.9714572   17.95 19.50 18.93   ~ 124 1
20 PSR B1509-58 Psr 15 13 55.52 -59 08 08.8           ~ 799 1
21 3EG J1612-2618 gam 16 13 -26.3           ~ 13 0
22 PSR J1637-4642 Psr 16 37 13.77 -46 42 15.0           ~ 26 0
23 2EG J1648-5042 AGN 16 39 29 -51 46.7           ~ 31 1
24 SNR G338.3-00.0 Rad 16 40 30.0 -46 33 00           ~ 133 2
25 2EG J1708-0927 gam 17 09 12.67 -08 20 05.6           ~ 21 0
26 PSR B1706-44 Psr 17 09 42.62 -44 29 05.8           ~ 580 1
27 3EG J1735-1500 gam 17 36 -15.0           ~ 18 0
28 2EG J1742-2250 gam 17 43 36.56 -23 08 23.9           ~ 20 0
29 3EG J1800-0146 gam 18 01 -01.8           ~ 10 0
30 3EG J1825+2854 gam 18 25 +28.9           ~ 8 0
31 PSR B1823-13 Psr 18 26 13.06 -13 34 48.1           ~ 357 1
32 GRO J1834+01 gam 18 29 +01.7           ~ 20 0
33 3EG J1837-0423 Rad 18 38 52.0 -04 16 16           ~ 80 1
34 3EG J1858-2137 gam 18 58 -21.6           ~ 7 0
35 2EG J1903+0529 gam 19 04 +05.8           ~ 28 1
36 3EG J1940-0121 gam 19 41 -01.4           ~ 8 0
37 PSR B1951+32 Psr 19 52 58.181 +32 52 40.98           ~ 551 2
38 3EG J2020-1545 gam 20 17 45.12 -16 18 21.1           ~ 17 0
39 3EG J2034-3110 gam 20 34 55.2 -31 10 48           ~ 11 0

    Equat.    Gal    SGal    Ecl

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2020.12.03-13:23:01

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