2022ApJ...940..139J

Query : 2022ApJ...940..139J

2022ApJ...940..139J - Astrophys. J., 940, 139 (2022/December-1)

Identifying the 3FHL Catalog. VI. Swift Observations of 3FHL Unassociated Objects with Source Classification via Machine Learning.

JOFFRE S., SILVER R., RAJAGOPAL M., AJELLO M., TORRES-ALBA N., PIZZETTI A., MARCHESI S. and KAUR A.

Abstract (from CDS):

The Third Catalog of Hard Fermi Large Area Telescope Sources (3FHL) reports the detection of 1556 objects at E > 10 GeV. However, 177 sources remain unassociated and 23 are associated with a ROSAT X-ray detection of unknown origin. Pointed X-ray observations were conducted on 30 of these unassociated and unknown sources with Swift-XRT. A bright X-ray source counterpart was detected in 21 out of 30 fields. In five of these 21 fields, we detected more than one X-ray counterpart, totaling 26 X-ray sources analyzed. Multiwavelength data was compiled for each X-ray source detected. We find that 21 out of the 26 X-ray sources detected display the multiwavelength properties of blazars, while one X-ray source displays the characteristics of a Galactic source. Using trained decision tree, random forest, and support vector machine models, we predict all 21 blazar counterpart candidates to be BL Lacertae objects (BL Lacs). This is in agreement with BL Lacs being the most populous source class in the 3FHL.

Abstract Copyright: © 2022. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Active galactic nuclei - Blazars - Gamma-ray astronomy - Random Forests - Support vector machine - X-ray identification

Simbad objects: 36

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Number of rows : 36
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 4FGL J0110.9+4344 Bz? 01 10 54.3 +43 44 51           ~ 16 0
2 3FHL J0121.8+3808 gam 01 21 49.558 +38 08 02.45           ~ 5 0
3 NVSS J022051+250926 BLL 02 20 51.2525300810 +25 09 27.383028404           ~ 34 1
4 NVSS J022126+251436 Rad 02 21 26.95 +25 14 36.4           ~ 3 0
5 2MASS J02212698+2514338 BLL 02 21 26.9644632792 +25 14 33.663649758           ~ 5 0
6 4FGL J0233.0+3740 Bz? 02 33 02.992 +37 42 56.34           ~ 14 0
7 87GB 023007.1+372939 BLL 02 33 07.9866809880 +37 41 59.832708396           ~ 5 1
8 3FHL J0243.3+1915 gam 02 43 23.688 +19 15 45.95           ~ 3 0
9 SUMSS J030115-561646 Bla 03 01 15.0863554486 -56 16 43.579319047           ~ 16 0
10 SUMSS J032009-704535 Bla 03 20 09.1494438712 -70 45 34.088709359           ~ 19 0
11 2MASS J04025445+6435101 BLL 04 02 54.4501700853 +64 35 10.070386075           ~ 18 1
12 4FGL J0459.4+1921 Bz? 04 59 26.4 +19 21 44           ~ 12 0
13 Gaia DR3 3408317206647436672 * 04 59 27.5012699661 +19 22 15.235156169           ~ 1 0
14 1RXS J045931.5+192242 X 04 59 31.502 +19 22 41.99           ~ 1 0
15 1RXS J050044.6+190308 Bz? 05 00 43.2278235834 +19 03 13.261565685           ~ 5 0
16 4FGL J0501.0+2424 Bz? 05 01 05.0 +24 24 41           ~ 17 0
17 SUMSS J055026-435658 Bz? 05 50 26.6064363490 -43 57 03.621019436           ~ 14 0
18 3FHL J0550.9+5657 gam 05 50 57.268 +56 57 08.45           ~ 3 0
19 4FGL J0754.0+0451 Bz? 07 54 05.1 +04 51 23           ~ 16 0
20 NVSS J083903+401546 BLL 08 39 03.0835285944 +40 15 45.596941128       15.3   ~ 31 1
21 NVSS J090133+671317 Bz? 09 01 33.8369772516 +67 13 16.944349215           ~ 16 0
22 1RXS J090140.8+671158 X 09 01 40.800 +67 11 58.49           ~ 2 0
23 3FHL J0950.6+6357 gam 09 50 39.423 +63 57 57.06           ~ 3 0
24 ICRF J112758.8+362028 Bla 11 27 58.87083269 +36 20 28.3514025   20.86 20.52 20.05   ~ 93 1
25 NVSS J142129-165448 AGN 14 21 28.9917984686 -16 54 56.085182559           ~ 11 0
26 4FGL J1528.4-6729 MIR 15 28 10.8336 -67 30 56.315           ~ 8 0
27 3FGL J1602.8-1924 Bz? 16 02 54.6 -19 28 12           ~ 21 0
28 4FGL J1626.0-4917c BLL 16 26 02.0 -49 17 02           ~ 20 0
29 1FGL J1729.8-4148 gam 17 29 55.2 -41 48 15           ~ 12 0
30 1RXS J180847.3+241923 Bla 18 08 45.6981784272 +24 19 05.617585751           ~ 16 0
31 4FGL J1849.3-6447 Bz? 18 49 21.050 -64 48 23.74           ~ 14 0
32 3EG J2027+3429 Bz? 20 26 36.7 +34 49 45           ~ 25 0
33 NVSS J210936+395515 Bla 21 09 36.1688178798 +39 55 13.529796351           ~ 14 0
34 NVSS J224531-173357 BL? 22 45 31.8599456189 -17 33 58.945941741           ~ 16 1
35 NVSS J231740+283952 BLL 23 17 40.2260413340 +28 39 55.781368802           ~ 20 1
36 1RXS J235836.3-180701 BLL 23 58 36.8418486539 -18 07 17.487571153   19.18   17.65   ~ 45 0

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