2021ApJ...908..177K

Query : 2021ApJ...908..177K

2021ApJ...908..177K - Astrophys. J., 908, 177-177 (2021/February-3)

Classifying blazar candidates from the 3FGL unassociated catalog into BL Lacertae objects and flat spectrum radio quasars Using Swift and WISE data.

KAUR A., FALCONE A.D. and STROH M.C.

Abstract (from CDS):

We utilize machine-learning methods to distinguish BL Lacertae (BL Lac) objects from flat spectrum radio quasars (FSRQs) within a sample of likely X-ray blazar counterparts to Fermi 3FGL unassociated gamma-ray sources. From our previous work, we have extracted 84 sources that were classified as >=99% likely to be blazars. We then utilize Swift-XRT, Fermi, and The Wide-field Infrared Survey Explorer (WISE) data together to distinguish the specific type of blazar, FSRQs, or BL Lac objects. Various X-ray and gamma-ray parameters can be used to differentiate between these subclasses. These are also known to occupy different parameter space on the WISE color-color diagram. Using all these data together would provide more robust results for the classified sources. We utilized a random forest classifier to calculate the probability for each blazar to be associated with a BL Lac object or an FSRQ. Based on Pbll, which is the probability for each source to be a BL Lac object, we placed our sources into five different categories based on this value as follows: Pbll >= 99%: highly likely BL Lac object, Pbll >= 90%: likely BL Lac object, Pbll <= 1%: highly likely FSRQ, Pbll <= 10%: likely FSRQ, and 90% < Pbll < 10%: ambiguous. Our results categorize the 84 blazar candidates as 50 likely BL Lac objects and the other 34 as being ambiguous. A small subset of these sources have been listed as associated sources in the most recent Fermi catalog, 4FGL, and in these cases our results are in agreement on the classification.

Abstract Copyright: © 2021. The American Astronomical Society. All rights reserved.

Journal keyword(s): Blazars - High energy astrophysics - BL Lacertae objects

Nomenclature: Tables 1-2: SwF3 JHHMMSS.s+DDMMSS N=24+84. Table 1: SwF3 JHHMMSS.ss+DDMMSS (No. J174511.10-225455).

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR. // All or part of tables of objects will be ingested in SIMBAD with priority 1.

Simbad objects: 109

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Number of rows : 109
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 RX J0048.9+4223 BLL 00 48 59.1606548688 +42 23 51.064163520           ~ 29 0
2 PSO J029.1022-24.3343 BLL 01 56 24.5498286186 -24 20 03.658820715           ~ 32 0
3 6dFGS gJ020020.9-410936 BLL 02 00 20.9436129216 -41 09 35.677153008   20.48   18.64   ~ 39 0
4 NVSS J023853+255407 BLL 02 38 53.8902026016 +25 54 07.149568824           ~ 23 0
5 3FGL J0244.4+4745 gam 02 45 03.8 +47 55 09           ~ 11 0
6 NVSS J025857+055240 BLL 02 58 57.5559833309 +05 52 43.949781063           ~ 29 0
7 2FGL J0340.7-2421 BLL 03 40 22.900 -24 24 07.30           ~ 30 0
8 2FGL J0341.8+3148c gam 03 41 56 +31 53.7           ~ 21 0
9 1RXS J034819.2+603505 BLL 03 48 19.8888708969 +60 35 08.898472741           ~ 21 1
10 1RXS J035051.7-281619 Bla 03 50 51.3185508513 -28 16 32.637946852           ~ 26 0
11 1RXS J042012.8-601446 AGN 04 20 11.0300589689 -60 15 05.167986705           ~ 25 0
12 SWIFT J0428.2-6704A LXB 04 27 49.6119608221 -67 04 35.066804919           ~ 76 1
13 NVSS J042958-305933 BLL 04 29 58.9389548415 -30 59 35.259803096           ~ 27 1
14 SUMSS J043836-732921 BLL 04 38 37.04040 -73 29 21.1630         16.329 ~ 28 0
15 NVSS J050650+032401 BLL 05 06 50.1481553527 +03 23 58.762381653           ~ 29 1
16 NVSS J051641+101244 BLL 05 16 41.4915855475 +10 12 44.844619989           ~ 11 1
17 3FGL J0535.7-0617c gam 05 35 44 -06 17.5           ~ 7 0
18 3FGL J0711.1-1037 gam 07 11 11 -10 37.3           ~ 5 0
19 NVSS J074627-022549 BLL 07 46 27.0461435424 -02 25 49.329617376   18.6   18.4   ~ 34 0
20 1RXS J074725.1-492626 BLL 07 47 24.7487371977 -49 26 33.292444057           ~ 26 0
21 2FGL J0748.5-2204 Bz? 07 48 22.01 -22 06 53.5           ~ 15 0
22 TYC 5993-3722-1 SB* 07 49 03.6821987592 -22 10 14.854697652   12.97 12.38     ~ 5 0
23 2FGL J0802.6-0940 gam 08 02.3 -09 42           ~ 28 0
24 NVSS J081338-035716 BLL 08 13 38.0632797594 -03 57 17.317406787           ~ 25 1
25 1RXS J082627.1-640421 BLL 08 26 27.8521571825 -64 04 15.261588978           ~ 31 1
26 1RXS J084830.4-694114 AGN 08 48 31.7095098282 -69 41 05.372215272           ~ 12 0
27 3FGL J0905.6-4917 gam 09 05 41 -49 17.8           ~ 10 0
28 3FGL J0919.5-2200 BLL 09 19 22.38 -22 07 57.0           ~ 20 1
29 3FGL J0928.3-5255 AGN 09 28 18.62669 -52 57 03.0360           ~ 21 0
30 NVSS J093754-143350 BLL 09 37 54.7254886560 -14 33 50.271271704           ~ 34 0
31 NVSS J095249+071330 BLL 09 52 49.5769750296 +07 13 30.043757136           ~ 31 1
32 3FGL J1016.5-6034 gam 10 15 35 -60 30.1           ~ 12 0
33 3FGL J1024.4-4545 AGN 10 24 32.4478735445 -45 44 27.686391981           ~ 19 0
34 1RXS J103332.0-503539 BLL 10 33 32.1477198726 -50 35 28.942977592           ~ 35 0
35 3FGL J1039.1-5809 gam 10 37 50.4 -58 10 58           ~ 12 0
36 3FGL J1050.6-6112 gam 10 50 42 -61 12.7           ~ 4 0
37 4FGL J1052.3+0818 BLL 10 52 24.5341521528 +08 14 09.499015572           ~ 24 1
38 2FGL J1059.9-2051 Bla 11 00 04.1 -20 44 38           ~ 21 0
39 3FGL J1104.3-7736c gam 11 04 19 -77 36.7           ~ 7 0
40 PMN J1117-4838 rG 11 17 19.90922 -48 38 10.2051           ~ 20 1
41 PMN J1130-7801 BLL 11 30 31.9491810471 -78 01 05.537610658           ~ 34 1
42 1RXS J113209.3-473844 Bla 11 32 09.2583762628 -47 38 53.358834060           ~ 28 0
43 NVSS J120055-143040 Bla 12 00 55.1326407918 -14 30 40.285106491           ~ 25 1
44 3FGL J1216.6-0557 Bla 12 16 15.1 -06 00 19           ~ 11 0
45 NVSS J122014-245949 Bla 12 20 14.5466882952 -24 59 48.636719509           ~ 24 1
46 NVSS J122020-371411 BLL 12 20 19.8121966761 -37 14 13.735408770           ~ 26 0
47 PSR J1221-0633 Psr 12 21 24.76 -06 33 51.7           ~ 40 0
48 SDSS J122257.00+121439.5 AGN 12 22 57.0107195528 +12 14 39.552597019           ~ 18 0
49 1RXS J122534.0-344737 BLL 12 25 36.8191255384 -34 47 21.763020315           ~ 30 1
50 NVSS J123235-372051 BLL 12 32 35.9363022254 -37 20 56.978039449           ~ 24 0
51 2MASS J12372576-7051383 AGN 12 37 25.7510846026 -70 51 38.153256900           ~ 9 0
52 1RXS J124015.2-714859 BLL 12 40 21.1849275886 -71 48 57.789188630           ~ 36 1
53 NVSS J124919-280833 BLL 12 49 19.31040 -28 08 34.3860           ~ 40 1
54 NVSS J124919-054541 Bla 12 49 19.3641927024 -05 45 39.762006948           ~ 27 1
55 5C 12.170 QSO 13 01 29.1544244472 +33 37 00.382119168   20.54 20.16     ~ 67 1
56 3FGL J1311.8-6230 gam 13 12 37 -62 31.7           ~ 14 0
57 NVSS J131552-073301 BLL 13 15 52.9742406408 -07 33 02.073662064   18.8   17.8 17.78 ~ 43 1
58 QSO B1326-0516 QSO 13 29 28.6263169296 -05 31 35.800962384   17.59 15.59 16.61   ~ 55 0
59 NVSS J141133-072252 BLL 14 11 33.3250365569 -07 22 53.412548437           ~ 25 1
60 LEDA 2686968 Bla 15 11 50.5581774312 +66 24 48.807412956   17.6       ~ 14 0
61 2MASS J15165000+2636369 QSO 15 16 50.0092057224 +26 36 37.077498468   18.33 18.01     ~ 37 0
62 NVSS J152603-083146 BLL 15 26 03.1817851576 -08 31 46.521208411           ~ 23 0
63 PSO J232.0754-29.0496 AGN 15 28 18.1181059301 -29 02 58.618813781           ~ 19 0
64 NVSS J154150+141437 BLL 15 41 50.0969224560 +14 14 37.576371048           ~ 41 1
65 NVSS J154946-304501 BLL 15 49 46.3034969270 -30 45 01.188007803           ~ 27 1
66 3FGL J1624.8-4233 Bz? 16 24 48 -42 34.0           ~ 7 0
67 1FGL J1627.6+3218 gam 16 28 00.40656 +32 24 14.0328           ~ 35 0
68 NVSS J170409+123421 BLL 17 04 09.5806742568 +12 34 21.510015888           ~ 45 1
69 3FGL J1705.5-4128c gam 17 06 15.5 -41 13 46           ~ 9 0
70 3FGL J1710.6-4317 gam 17 10.6 -43 17           ~ 7 0
71 2AGL J1720-3859 gam 17 21.7 -39 17           ~ 13 0
72 1RXS J172857.9+604352 * 17 28 58.6008001584 +60 44 00.411809172   12.32 11.75     ~ 8 0
73 2EG J1731+6007 gam 17 29.0 +60 49           ~ 24 0
74 3FGL J1744.7-2252 gam 17 45 32.0 -22 49 04           ~ 7 0
75 HD 162298 * 18 01 06.4562482224 -78 22 49.189369728   8.97 7.32     K4III 18 0
76 3FGL J1801.5-7825 gam 18 01.5 -78 25           ~ 8 0
77 3FGL J1855.6+0753 gam 18 55 20.35 +07 51 40.0           ~ 7 0
78 1RXS J192244.1-745411 BLL 19 22 42.22672 -74 53 56.6374           ~ 32 0
79 1RXS J193419.5+600122 BLL 19 34 19.6351633080 +60 01 39.599727596           ~ 29 1
80 3FGL J1951.3+6909 gam 19 51.3 +69 09           ~ 8 0
81 NVSS J195800+243802 BLL 19 58 00.39986 +24 38 02.8680           ~ 24 1
82 3FGL J2010.0-2120 gam 20 09 54.3 -21 16 37           ~ 10 0
83 NVSS J201525-143202 BLL 20 15 25.0319171111 -14 32 04.087881631           ~ 22 1
84 NVSS J203028-143918 BLL 20 30 27.9249379091 -14 39 17.116804198           ~ 22 1
85 SUMSS J203451-420024 BLL 20 34 51.0909972120 -42 00 38.437476084           ~ 43 1
86 RX J2035.9+4900 BLL 20 35 51.6485549578 +49 01 44.306515954           ~ 29 1
87 V* V2552 Cyg EB* 20 35 57.1821703584 +49 00 42.463128312   11.98 10.834 10.334 9.864 ~ 17 0
88 2MASS J20393591+1229587 AGN 20 39 35.9126083526 +12 29 58.556481338           ~ 14 1
89 4FGL J2053.8+2922 BLL 20 53 50.6975506968 +29 23 14.858118852           ~ 28 1
90 1RXS J205950.3+202850 Bla 20 59 50.2501476090 +20 29 02.386482260           ~ 10 1
91 NVSS J210939+044000 BLL 21 09 40.1214306936 +04 40 00.363770800           ~ 21 1
92 NVSS J211522+121802 BLL 21 15 21.9991464024 +12 18 02.807891784           ~ 38 0
93 2FGL J2120.6-1301 Bla 21 20 35.81 -12 54 40.8           ~ 27 1
94 NVSS J214247+195810 BLL 21 42 47.4925276917 +19 58 10.908636002           ~ 25 1
95 NVSS J215122+415632 Bla 21 51 23.0062752136 +41 56 32.429491556           ~ 20 1
96 SDSS J222911.17+225459.7 BLL 22 29 11.1789455148 +22 54 59.773923047           ~ 21 0
97 NVSS J224436+250345 BLL 22 44 36.7023798282 +25 03 42.643716944           ~ 26 1
98 NVSS J225032+174915 Bla 22 50 32.7567295767 +17 49 14.907644163           ~ 35 1
99 NVSS J230012+405224 BLL 23 00 12.3707568624 +40 52 24.693697956           ~ 30 2
100 NVSS J230352+555609 BLL 23 03 51.5689878056 +55 56 19.481755853           ~ 18 0
101 NVSS J230848+542612 BLL 23 08 48.7277462875 +54 26 11.085471200           ~ 17 0
102 NVSS J232127+511117 BLL 23 21 27.4366936273 +51 11 15.086568411           ~ 20 0
103 PHL 5711 BLL 23 21 37.0098015261 -16 19 28.388190783   19.4   19.2   ~ 28 1
104 2MASS J23265307-4127112 Bz? 23 26 53.0651282439 -41 27 10.976378715           ~ 19 0
105 NVSS J232938+610113 BLL 23 29 38.3642411453 +61 01 13.279974500           ~ 19 0
106 3FGL J2337.2-8425 AGN 23 36 27.6490458771 -84 26 51.896370602           ~ 21 0
107 PMN J2351-7559 BLL 23 51 16.1303690805 -76 00 15.557110600           ~ 35 1
108 B3 2355+382 BLL 23 58 25.1731211064 +38 28 56.494492536           ~ 37 1
109 1RXS J235836.3-180701 BLL 23 58 36.8418486539 -18 07 17.487571153   19.18   17.65   ~ 45 0

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