2000ApJ...541..180M

Query : 2000ApJ...541..180M

2000ApJ...541..180M - Astrophys. J., 541, 180-193 (2000/September-3)

Search for the identification of 3EG J1835+5918: evidence for a new type of high-energy gamma-ray source.

MIRABAL N., HALPERN J.P., ERACLEOUS M. and BECKER R.H.

Abstract (from CDS):

The EGRET source 3EG J1835+5918 is the brightest and most accurately positioned of the as-yet unidentified high-energy γ-ray sources at high Galactic latitude (ℓ,b=89°,25°). We present a multiwavelength study of the region around it, including X-ray, radio, and optical imaging surveys, as well as optical spectroscopic classification of most of the active objects in this area. Identifications are made of all but one of the ROSAT and ASCA sources in this region to a flux limit of approximately 5x10–14 ergs.cm–2.s–1, which is 10–4 of the γ-ray flux. The identified X-ray sources in or near the EGRET error ellipse are radio-quiet QSOs, a galaxy cluster, and coronal emitting stars. We also find nine quasars using purely optical color selection, and we have monitored the entire field for variable optical objects on short and long timescales without any notable discoveries. The radio sources inside the error ellipse are all fainter than 4 mJy at 1.4 GHz. There are no flat-spectrum radio sources in the vicinity; the brightest neighboring radio sources are steep-spectrum radio galaxies or quasars. Since no blazar-like or pulsar-like candidate has been found as a result of these searches, 3EG J1835+5918 must be lacking one or more of the physically essential attributes of these known classes of γ-ray emitters. If it is an AGN it lacks the beamed emission radio of blazars by at least a factor of 100 relative to identified EGRET blazars. If it is an isolated neutron star, it lacks the steady thermal X-rays from a cooling surface and the magnetospheric nonthermal X-ray emission that is characteristic of all EGRET pulsars. If a pulsar, 3EG J1835+5918 must be either older or more distant than Geminga, and probably an even more efficient or beamed γ-ray engine. One intermittent ROSAT source falls on a blank optical field to a limit of B>23.4, V>25.2, and R>24.5. In view of this conspicuous absence, RX J1836.2+5925 should be examined further as a candidate for identification with 3EG J1835+5918 and possibly the prototype of a new class of high-energy γ-ray source.

Abstract Copyright: ∼

Journal keyword(s): Gamma Rays: Observations - Stars: Pulsars: General - Radio Continuum: Galaxies - X-Rays: General

Nomenclature: Table 2: [MHE2000] JHHMMSS.ss+DDMMSS.s = [MHE2000] VLA JHHMM.m+DDMM N=20. Text: [MHE2000] JHHMMSS.ss+DDMMSS.s N=2. Table 3: [MHE2000] UVQ JHHMM.m+DDMM N=3.

Simbad objects: 55

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Number of rows : 55
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 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
2 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
3 M 1 SNR 05 34 31.8 +22 01 03           ~ 6516 1
4 V* CM Tau Psr 05 34 31.9474694616 +22 00 52.153698024           ~ 5476 0
5 PSR J0633+1746 Psr 06 33 54.153 +17 46 12.91           ~ 1308 0
6 EM* GGA 401 HXB 06 35 18.2797640568 +05 33 06.274961892   13.769 12.837 12.512   B2V-B1IIIe 60 0
7 NAME MONOCEROS NEB SNR 06 38 43 +06 30.2           ~ 264 0
8 NAME Vela Pulsar Psr 08 35 20.65525 -45 10 35.1545     15.10     ~ 2446 1
9 PSR B1046-58 Psr 10 48 13.10000 -58 32 03.0000           ~ 293 0
10 PSR B1055-52 Psr 10 57 59.0450 -52 26 56.330           ~ 757 0
11 CPD-63 2495 HXB 13 02 47.6544015048 -63 50 08.626970292 10.34 10.72 9.98 10.03   O9.5Ve 852 0
12 NAME Centaurus A BLL 13 25 27.61521044 -43 01 08.8050291   8.18 6.84 6.66   ~ 4774 3
13 PSR B1706-44 Psr 17 09 42.62000 -44 29 12.0000     13.30     ~ 670 1
14 [MHE2000] VLA J1832.2+5918 Rad 18 32 12.54 +59 18 05.3           ~ 1 0
15 LEDA 2589979 rG 18 32 37.9878648912 +59 23 43.912133124           ~ 3 0
16 AX J1832.6+5923 ClG 18 32 38.00 +59 23 43.8           ~ 2 0
17 2MASX J18324946+5921494 rG 18 32 49.5064497624 +59 21 49.365198972           ~ 1 0
18 LEDA 2590769 rG 18 32 58.2997511664 +59 27 58.941238428           ~ 2 0
19 [VV2006] J183319.7+593006 QSO 18 33 18.9848094816 +59 30 04.937445000   18.9       ~ 3 0
20 [MHE2000] VLA J1833.4+5905 Rad 18 33 24.94 +59 05 05.7           ~ 1 0
21 [MHE2000] J183342.08+591126.6 rG 18 33 42.08 +59 11 26.6           ~ 1 0
22 [MHE2000] VLA J1833.7+5936 Rad 18 33 43.03 +59 36 27.8           ~ 1 0
23 [MHE2000] VLA J1833.8+5920 Rad 18 33 48.78 +59 20 04.2           ~ 1 0
24 NVSS J183350+593531 Rad 18 33 50.55 +59 35 31.8           ~ 1 0
25 [VV2006] J183408.2+591351 QSO 18 34 08.2349333376 +59 13 52.416066756   19.3 18.8     ~ 3 0
26 [MHE2000] VLA J1834.2+5932 Rad 18 34 12.74 +59 32 06.1           ~ 1 0
27 RX J1834.2+5920 * 18 34 14.88 +59 20 24.5   10.9       G7 2 0
28 2MASS J18342024+5909162 * 18 34 20.2387534056 +59 09 16.169486832   17.8       MV:e 1 0
29 [MHE2000] UVQ J1834.3+5926 QSO 18 34 20.8565959032 +59 34 20.570524140           ~ 1 0
30 [MHE2000] UVQ J1834.3+5918 rG 18 34 21.1 +59 18 46           ~ 3 0
31 RX J1834.4+5920 * 18 34 24.74 +59 20 55.6           M5 2 0
32 [MHE2000] VLA J1834.7+5924 Rad 18 34 43.92 +59 24 11.2           ~ 1 0
33 [MHE2000] VLA J1834.7+5918 Rad 18 34 46.19 +59 18 28.1           ~ 1 0
34 [MHE2000] VLA J1834.7+5938 Rad 18 34 47.16 +59 38 31.0           ~ 1 0
35 NVSS J183450+593654 Rad 18 34 50.88 +59 36 54.0           ~ 1 0
36 NVSS J183451+590834 Rad 18 34 51.73 +59 08 34.7           ~ 1 0
37 LEDA 2586630 rG 18 35 12.0781718544 +59 06 44.964022680           ~ 2 0
38 ATO J278.8864+59.2615 PM* 18 35 32.6366343792 +59 15 41.941250064   16.7       ~ 8 0
39 NVSS J183533+590405 Rad 18 35 33.15 +59 04 05.2           ~ 1 0
40 8C 1834+596 QSO 18 35 39.8633886336 +59 39 50.666995224   18.4 18.30     ~ 7 1
41 NVSS J183542+590338 Rad 18 35 42.21 +59 03 38.8           ~ 1 0
42 [VV2006] J183553.7+592330 QSO 18 35 53.6097633336 +59 23 30.310869444   19.6       ~ 4 0
43 RX J1835.9+5926 X 18 35 58.49 +59 26 17.5           ~ 2 0
44 RX J1836.0+5924 BY* 18 36 00.1272175944 +59 24 55.455140988   19.4       MV:e 3 0
45 RX J1836.1+5925 QSO 18 36 07.41 +59 25 04.8   21.1       ~ 1 0
46 PSR J1836+5925 Psr 18 36 13.661 +59 25 29.77           ~ 153 0
47 [VV2006] J183616.2+592906 QSO 18 36 16.0346636520 +59 29 07.293480108     20.00     ~ 3 0
48 NVSS J183631+590546 Rad 18 36 31.63 +59 05 46.1           ~ 1 0
49 [VV2006] J183636.9+592042 QSO 18 36 36.7207 +59 20 42.491   21.3       ~ 5 0
50 [VV2006] J183638.7+592525 QSO 18 36 38.4875170848 +59 25 26.054751000   19.8 19.80     ~ 4 0
51 TYC 3917-1807-1 * 18 36 50.9606192544 +59 10 08.967003600   11.83 10.94     K5 5 0
52 [VV2006] J183700.6+593418 QSO 18 37 00.5668920792 +59 34 17.667091776   18.5       ~ 6 0
53 [MHE2000] VLA J1837.4+5932 Rad 18 37 28.66 +59 32 29.4           ~ 1 0
54 [MHE2000] VLA J1837.5+5931 Rad 18 37 31.05 +59 31 36.1           ~ 1 0
55 PSR B1951+32 Psr 19 52 58.181 +32 52 40.98           ~ 615 2

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