1999ApJ...521..246C

Query : 1999ApJ...521..246C

1999ApJ...521..246C - Astrophys. J., 521, 246-254 (1999/August-2)

On the nature of the discrete gamma-ray sources in the vicinity of the supernova remnant G312.4-0.4.

CASE G. and BHATTACHARYA D.

Abstract (from CDS):

We discuss the excess gamma-ray emission seen from point sources in the vicinity of the supernova remnant (SNR) G312.4-0.4 with the EGRET instrument on board the Compton Gamma Ray Observatory in the energy range of 100 MeV to 10 GeV. Two gamma-ray sources have been significantly detected. The best-fit position for the source 2EG J1412-6211, which was originally discovered by COS B (catalog name 2CG 311-01), is located approximately 17' southwest of the center of the supernova remnant G312.4-0.4. We find the gamma-ray flux level of this source to be relatively constant over a period of 4 yr. The origin of the gamma-ray emission with respect to a SNR-pulsar source is discussed. The best-fit position for the other source, 2EGS J1418-6049, lies 1°.3 northeast of the center of G312.4-0.4. It has a variable flux level, with a spectrum extending up to a few GeV. We argue that 2EGS J1418-6049 is transient in nature and that its variability makes it unlikely to be associated with G312.4-0.4 or any other SNR or isolated pulsar. We suggest that this source may belong to a new class of unidentified Galactic sources which includes the EGRET source 2EG J0241+6119 (2CG 135+01).

Abstract Copyright: ∼

Journal keyword(s): Gamma Rays: Observations - ISM: individual (G312.4-0.4) - ISM: Supernova Remnants

Simbad objects: 25

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Number of rows : 25
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 SNR G119.5+10.2 SNR 00 06.6 +72 47           ~ 268 1
2 LS I +61 303 HXB 02 40 31.6644419688 +61 13 45.593918580 11.27 11.61 10.75 10.19 9.55 B0Ve 903 2
3 V* X Per HXB 03 55 23.0777456088 +31 02 45.039836148 6.090 6.840 6.720     O9.5III 1037 0
4 M 1 SNR 05 34 31.8 +22 01 03           ~ 6516 1
5 V* CM Tau Psr 05 34 31.9474694616 +22 00 52.153698024           ~ 5476 0
6 IC 443 SNR 06 17 00.0000000 +22 34 11.998901           ~ 1314 1
7 PSR J0633+1746 Psr 06 33 54.153 +17 46 12.91           ~ 1308 0
8 NAME MONOCEROS NEB SNR 06 38 43 +06 30.2           ~ 264 0
9 NAME Vela SNR 08 34.0 -45 50           ~ 1331 2
10 NAME Vela Pulsar Psr 08 35 20.65525 -45 10 35.1545     15.10     ~ 2446 1
11 PSR B1055-52 Psr 10 57 59.0450 -52 26 56.330           ~ 757 0
12 V* V779 Cen HXB 11 21 15.0920532528 -60 37 25.630264596   14.4 12.27     O9III/Veq 1159 0
13 SNR G312.4-00.4 SNR 14 13 00 -61 44.0           ~ 96 1
14 AX J1418.2-6047 X 14 18 15.8 -60 46 44           ~ 6 0
15 AX J1418.6-6045 X 14 18 38.2 -60 45 03           ~ 6 0
16 AX J1418.7-6058 X 14 18 38.6 -60 57 49           ~ 55 0
17 PSR J1418-6058 Psr 14 18 42.725 -60 58 01.89           ~ 129 0
18 PSR J1420-6048 Psr 14 20 08.190 -60 48 14.85           ~ 214 0
19 GRO J1443-60 gam 14 43 -60.7           ~ 11 0
20 PSR B1706-44 Psr 17 09 42.62000 -44 29 12.0000     13.30     ~ 670 1
21 SNR G006.4-00.1 SNR 18 00 31.2011719 -23 25 48.001099           ~ 782 1
22 GRO J1838-04 gam 18 37.5 -04 32           ~ 12 0
23 SNR G034.6-00.5 SNR 18 56 10.650 +01 13 21.30           ~ 1034 2
24 PSR B1951+32 Psr 19 52 58.181 +32 52 40.98           ~ 615 2
25 NAME gam Cyg SNR SNR 20 20 17.100 +40 26 09.00           ~ 247 2

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