2020ApJ...902...23S

Query : 2020ApJ...902...23S

2020ApJ...902...23S - Astrophys. J., 902, 23-23 (2020/October-2)

Identifying the 3FHL catalog. IV. Swift observations of unassociated Fermi-LAT 3FHL sources.

SILVER R., MARCHESI S., MARCOTULLI L., KAUR A., RAJAGOPAL M. and AJELLO M.

Abstract (from CDS):

The Fermi Large Area Telescope (Fermi-LAT) 3FHL catalog is the latest catalog of >10 GeV sources and will remain an important resource for the high-energy community for the foreseeable future. Therefore, it is crucial that this catalog is made complete by providing associations for most sources. In this paper, we present the results of the X-ray analysis of 38 3FHL sources. We found a single bright X-ray source in 20 fields, two sources each in two fields, and none for the remaining 16. The analysis of the properties of the 22 3FHL fields with X-ray sources led us to believe that most (∼19/22) are of extragalactic origin. A machine-learning algorithm was used to determine the source type and we find that 15 potential blazars are likely BL Lacertae objects (BL Lac objects). This is consistent with the fact that BL Lac objects are by far the most numerous population detected above >10 GeV in the 3FHL.

Abstract Copyright: © 2020. The American Astronomical Society. All rights reserved.

Journal keyword(s): Active galactic nuclei - Blazars - Gamma-ray astronomy - X-ray identification

Simbad objects: 24

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Number of rows : 24
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 NVSS J005758+632636 Bla 00 57 58.38912 +63 26 39.0876           ~ 17 0
2 1RXS J023341.7+065545 BLL 02 33 40.9956447624 +06 56 11.057403995           ~ 24 1
3 2MASS J03592349-0235022 Bz? 03 59 23.49144 -02 35 02.2704           ~ 15 0
4 1FGL J0528.4+3838 gam 05 28 31.56 +38 51 56.3           ~ 8 0
5 2MASS J06482642+1744235 Bz? 06 48 26.42712 +17 44 23.5536           ~ 15 0
6 2MASS J07371703+6535579 HXB 07 37 17.0432126424 +65 35 57.826001220           SNIIP 317 1
7 4FGL J0737.4+6535 gam 07 37 30 +65 35.5           ~ 16 0
8 ICRF J093333.1-524019 Bz? 09 33 33.16985851 -52 40 19.2193373           ~ 15 0
9 2MASS J14051441-6118282 HXB 14 05 14.41560 -61 18 28.2168           O6.5III 53 0
10 2MASS J14395085-3955185 BLL 14 39 50.85960 -39 55 18.5988           ~ 30 0
11 4FGL J1452.0-4148 gam 14 51 49.31400 -41 45 03.4344           ~ 10 0
12 1RXS J171855.3-535056 BL? 17 18 56.4428705176 -53 50 43.256148672           ~ 9 0
13 4FGL J1855.2+0756 gam 18 55 15.0 +07 56 49           ~ 8 0
14 3FGL J1855.6+0753 gam 18 55 20.35 +07 51 40.0           ~ 7 0
15 4FGL J1906.9+0712 gam 19 06 59.4 +07 12 59           ~ 11 0
16 NVSS J191803+033032 Bla 19 18 03.6088258188 +03 30 30.334452021           ~ 12 0
17 NVSS J192729+015353 Bla 19 27 31.2005309491 +01 53 58.479092041           ~ 12 0
18 SUMSS J203023-503413 Bz? 20 30 24.0108142023 -50 34 12.978425826           ~ 13 0
19 NVSS J203031+223439 BL? 20 30 31.3616464766 +22 34 38.692931262           ~ 18 0
20 RX J2104.2+2118 BLL 21 04 15.9258290639 +21 18 08.143129461           ~ 21 0
21 NVSS J210606+750926 BL? 21 06 05.4758570406 +75 09 20.780449041           ~ 11 0
22 4FGL J2159.6-4620 BL? 21 59 36.1238541905 -46 19 53.759407406           ~ 16 0
23 LEDA 787461 Bz? 22 39 28.8352038192 -24 39 44.142274152   18.370   16.758   ~ 14 1
24 PHL 5711 BLL 23 21 37.0098015261 -16 19 28.388190783   19.4   19.2   ~ 28 1

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