2002ApJ...574..693M

Query : 2002ApJ...574..693M

2002ApJ...574..693M - Astrophys. J., 574, 693-700 (2002/August-1)

Is the EGRET source 3EG J1621+8203 the radio galaxy NGC 6251?

MUKHERJEE R., HALPERN J., MIRABAL N. and GOTTHELF E.V.

Abstract (from CDS):

We discuss the nature of the unidentified EGRET source 3EG J1621+8203. In an effort to identify the gamma-ray source, we have examined X-ray images of the field from ROSAT PSPC, ROSAT HRI, and ASCA GIS. Of the several faint X-ray point sources in the error circle of 3EG J1621+8203, most are stars or faint radio sources, unlikely to be counterparts to the EGRET source. The most notable object in the gamma-ray error box is the bright FR I radio galaxy NGC 6251. If 3EG J1621+8203 corresponds to NGC 6251, then it would be the second radio galaxy to be detected in high-energy gamma rays after Cen A, which provided the first clear evidence of the detection above 100 MeV of an active galactic nucleus (AGN) with a large-inclination jet. If the detection of more radio galaxies by EGRET has been limited by its threshold sensitivity, there exists the exciting possibility that new high-energy gamma-ray instruments, with much higher sensitivity, will detect a larger number of radio galaxies in the future.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Individual: NGC Number: NGC 6251 - Gamma Rays: Observations - X-Rays: General - X-Rays: Individual: Alphanumeric: 3EG J1621+8203

Nomenclature: Table 1: [MHM2002] NN (Nos 1-17). Table 2: [MHM2002] a (Nos a-i). Table 3: [MHM2002] BNN (Nos B1-B10).

Simbad objects: 47

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Number of rows : 47
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 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
2 NAME Centaurus A BLL 13 25 27.61521044 -43 01 08.8050291   8.18 6.84 6.66   ~ 4774 3
3 BD+82 477 SB* 16 03 26.4550847424 +81 42 21.048761844   10.09 9.39     G2V 19 0
4 1RXS J160452.7+820748 X 16 04 52.7 +82 07 48           ~ 1 0
5 [MHM2002] 15 X 16 06 52.0 +81 30 28           ~ 1 0
6 4B 970815 gB 16 06 54.0 +81 30 34           ~ 56 0
7 NVSS J160729+820134 Rad 16 07 29.10 +82 01 36.8           ~ 4 1
8 1RXS J160733.9+812118 X 16 07 33.9 +81 21 18           ~ 1 0
9 1RXS J160752.0+821316 X 16 07 52.0 +82 13 16           ~ 1 0
10 1RXS J161242.6+821525 X 16 12 42.6 +82 15 25           ~ 1 0
11 [MHM2002] 16 X 16 13 17.3 +81 23 33           ~ 1 0
12 WN B1621+8142 X 16 21 24.93 +81 35 34.1           ~ 1 0
13 [MHM2002] 5 X 16 22 32.6 +82 37 06           ~ 1 0
14 NVSS J162411+820914 Rad 16 24 12.00 +82 09 16.2           ~ 4 1
15 [MHM2002] 4 X 16 24 12.7 +82 32 48           ~ 1 0
16 [MHM2002] 3 X 16 24 30.0 +82 19 00           ~ 1 0
17 [MHM2002] 6 X 16 25 13.2 +82 36 13           ~ 1 0
18 [MHM2002] 7 X 16 25 27.3 +82 34 49           ~ 1 0
19 [MHM2002] 10 X 16 25 29.6 +82 14 39           ~ 1 0
20 1RXS J162554.6+815602 X 16 25 54.6 +81 56 02           ~ 1 0
21 8C 1631+826 Rad 16 26 24 +82 35.1           ~ 2 0
22 NVSS J162643+815850 Rad 16 26 43.81 +81 58 50.7           ~ 4 1
23 [MHM2002] B5 X 16 27 42.31 +82 42 26.1           ~ 1 0
24 NVSS J162809+815021 Rad 16 28 09.76 +81 50 21.9           ~ 2 1
25 [MHM2002] B4 X 16 29 25.21 +82 35 34.1           ~ 1 0
26 1RXS J163027.4+813206 X 16 30 27.4 +81 32 06           ~ 1 0
27 [MHM2002] B3 X 16 30 51.13 +82 33 45.6           ~ 1 0
28 1RXS J163121.3+812641 X 16 31 21.3 +81 26 41           ~ 2 0
29 [MHM2002] B2 X 16 31 47.88 +82 32 54.7           ~ 1 0
30 1RXS J163220.1+813201 X 16 32 20.1 +81 32 01           ~ 1 0
31 NGC 6251 Bla 16 32 31.96989253 +82 32 16.3999044 15.24 14.66 12.89 7.62   ~ 772 1
32 2E 1641.1+8259 X 16 35 25.2 +82 53 30           ~ 1 0
33 2MASX J16365123+8207363 H2G 16 36 51.237 +82 07 36.34           ~ 6 0
34 [MHM2002] 17 X 16 37 20.6 +82 07 36           ~ 1 0
35 2MASX J16372720+8207072 AGN 16 37 27.1563796728 +82 07 07.352615676           ~ 8 0
36 [MHM2002] 9 * 16 39 01.5797007072 +82 35 48.348396384           ~ 1 0
37 2RXP J164016.6+823203 X 16 40 16.6 +82 32 03           ~ 1 0
38 [MHM2002] 2 X 16 41 05.1 +82 32 54           ~ 1 0
39 2E 3765 ClG 16 41 11.0 +82 32 26           ~ 14 0
40 [MHM2002] 12 X 16 41 18.9 +82 07 56           ~ 1 0
41 [MHM2002] 13 X 16 42 58.1 +82 01 02           ~ 1 0
42 [MHM2002] 11 X 16 44 12.6 +82 30 07           ~ 1 0
43 * eps UMi RS* 16 45 58.2436042536 +82 02 14.129823444   5.109 4.212     G5III 218 0
44 [MHM2002] 8 X 16 46 04.1 +82 02 34           ~ 1 0
45 PSR J1836+5925 Psr 18 36 13.661 +59 25 29.77           ~ 153 0
46 QSO J2015+371 BLL 20 15 28.72978661 +37 10 59.5147372     21.82 21.4   ~ 324 2
47 PSR J2229+6114 Psr 22 29 05.262 +61 14 08.48           ~ 252 2

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