2023ApJ...943..167K

Query : 2023ApJ...943..167K

2023ApJ...943..167K - Astrophys. J., 943, 167 (2023/February-1)

Using Neural Networks to Differentiate Newly Discovered BL Lacertae Objects and FSRQs among the 4FGL Unassociated Sources Employing Gamma-Ray, X-Ray, UV/Optical, and IR Data.

KAUR A., KERBY S. and FALCONE A.D.

Abstract (from CDS):

Among the ∼2157 unassociated sources in the third data release (DR3) of the fourth Fermi catalog, ∼1200 were observed with the Neil Gehrels Swift Observatory pointed instruments. These observations yielded 238 high signal-to-noise ratio X-ray sources within the 95% Fermi uncertainty regions. Recently, Kerby et al. employed neural networks to find blazar candidates among these 238 X-ray counterparts to the 4FGL unassociated sources and found 112 likely blazar counterpart sources. A complete sample of blazars, along with their subclassification, is a necessary step to help understand the puzzle of the blazar sequence and for the overall completeness of the gamma-ray emitting blazar class in the Fermi catalog. We employed a multi-perceptron neural network classifier to identify flat spectrum radio quasars (FSRQs) and BL Lac objects among these 112 blazar candidates using the gamma-ray, X-ray, UV/optical, and IR properties. This classifier provided probability estimates for each source to be associated with one or the other category, such that Pfsrq represents the probability for a source to be associated with the FSRQ subclass. Using this approach, four FSRQs and 50 BL Lac objects are classified as such with >99% confidence, while the remaining 58 blazars could not be unambiguously classified as either BL Lac objects or FSRQs.

Abstract Copyright: © 2023. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): High energy astrophysics - Active galactic nuclei - Blazars - X-ray astronomy

VizieR on-line data: <Available at CDS (J/ApJ/943/167): table1.dat table2.dat table3.dat>

Nomenclature: Table 2: SwUVF4 JHHMMSS.s+DDMMSS N=113.

Status at CDS : All or part of tables of objects will be ingested in SIMBAD with priority 1.

Simbad objects: 116

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Number of rows : 116
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 ATO J000.3251-07.7741 BLL 00 01 18.0249466512 -07 46 26.920186536 18.18 17.88 17.90 16.3   ~ 61 1
2 NVSS J000434-400032 BLL 00 04 34.2273923064 -40 00 35.201389896   17.55   16.23   ~ 17 0
3 QSO B0002-478 Bla 00 04 35.65548526 -47 36 19.6040054   17.63 19.0 15.88   ~ 116 1
4 QSO B0003+380 Bla 00 05 57.17538691 +38 20 15.1489639   19.4 18.10 17.16   ~ 155 1
5 4FGL J0006.3-0620 Bz? 00 06 23.8 -06 20 57           ~ 27 0
6 2MASS J00075997+4712078 BLL 00 07 59.9724805320 +47 12 07.769093004   18.3   18.2   ~ 71 1
7 2MASS J00083540-2339279 BLL 00 08 35.3995342872 -23 39 28.008110844     17.90     ~ 49 1
8 QSO J0009+0628 BLL 00 09 03.9322109352 +06 28 21.242543304 19.24 18.51 18.14 19.1   ~ 85 1
9 [VV2006] J001028.8+204749 Bla 00 10 28.74304373 +20 47 49.7884182     17.80 18.41   ~ 67 1
10 4FGL J0010.6-3025 AG? 00 10 40.2 -30 25 33           ~ 13 0
11 [VV2006] J001130.4+005751 Bla 00 11 30.40320483 +00 57 51.8770044   18.55 18.16 20.06   ~ 117 1
12 4FGL J0025.4-4838 BL? 00 25 36.9282171972 -48 38 09.589927829           ~ 11 0
13 NVSS J002611-073115 Bla 00 26 11.6368910448 -07 31 15.823966764   18.7   18.6   ~ 14 0
14 SUMSS J003136-564637 BLL 00 31 35.4796812785 -56 46 41.469736929           ~ 13 0
15 1RXS J003728.4-265023 Q? 00 37 29.5276820198 -26 50 45.203912220           ~ 12 0
16 NVSS J005758+632636 Bla 00 57 58.38912 +63 26 39.0876           ~ 17 0
17 1RXS J005807.5-460420 BL? 00 58 06.2216135789 -46 04 18.993546791           ~ 14 0
18 PMN J0118-6008 Bla 01 18 23.4823747630 -60 07 51.392739546           ~ 12 1
19 4FGL J0120.2-7944 gam 01 20 14 -79 44.5           ~ 10 0
20 SUMSS J012547-630242 Bla 01 25 48.1975322775 -63 02 45.153514486           ~ 11 0
21 PSO J029.1022-24.3343 BLL 01 56 24.5498286186 -24 20 03.658820715           ~ 32 0
22 NVSS J015904+331258 Bla 01 59 05.2025478815 +33 12 57.632125109           ~ 16 0
23 NVSS J020946+262528 Bla 02 09 46.7301026083 +26 25 30.955609979           ~ 12 0
24 NVSS J023112+350443 Bla 02 31 12.1816277202 +35 04 44.569707052           ~ 11 0
25 2MASS J02400450-0245025 Bla 02 40 04.5086956045 -02 45 02.630391554           ~ 16 0
26 NVSS J025857+055240 BLL 02 58 57.5559833309 +05 52 43.949781063           ~ 29 0
27 SUMSS J030115-561646 Bla 03 01 15.0863554486 -56 16 43.579319047           ~ 16 0
28 NVSS J030226+335447 Bla 03 02 27.0447847474 +33 54 45.805686772           ~ 14 1
29 NVSS J032737+262010 Bla 03 27 37.2949275153 +26 20 11.012156903           ~ 15 0
30 NVSS J040608+063920 Bla 04 06 07.9444923035 +06 39 21.989679451           ~ 22 0
31 NVSS J040922+254440 Bla 04 09 21.7397224968 +25 44 42.042738277           ~ 12 0
32 SWIFT J0428.2-6704A LXB 04 27 49.6119608221 -67 04 35.066804919           ~ 76 1
33 NVSS J053745+095756 Bla 05 37 45.92200080 +09 57 58.7351520           ~ 17 0
34 4FGL J0539.2-6333 BL? 05 40 02.9149007377 -63 32 15.582361438           ~ 13 0
35 PSO J086.1030+52.2544 AG? 05 44 24.7389019500 +52 15 16.195495396           ~ 2 0
36 4FGL J0544.8+5209c gam 05 44 52.1 +52 09 37           ~ 11 0
37 4FGL J0610.8-4911 gam 06 10 51.4 -49 11 01           ~ 11 0
38 1RXS J062046.9-503405 BLL 06 20 46.1243683737 -50 33 50.926403007           ~ 15 0
39 NVSS J063359+584031 Bla 06 33 59.7241571539 +58 40 35.828074401           ~ 13 0
40 1RXS J065033.9+205603 BLL 06 50 35.3520080787 +20 55 57.363171447           ~ 23 0
41 3FGL J0704.3-4828 AGN 07 04 21.8121461170 -48 26 47.412221745           ~ 19 0
42 3FGL J0739.8+1312 Bz? 07 38 37.4 +13 11 05           ~ 14 0
43 4FGL J0800.1-5531 gam 08 00 10.3 -55 31 35           ~ 10 0
44 NVSS J080056+073234 Bla 08 00 56.5649310192 +07 32 35.085647652           ~ 14 0
45 TGSSADR J082705.1-411152 BL? 08 27 05.7956 -41 11 57.036           ~ 8 0
46 NVSS J083903+401546 BLL 08 39 03.0835285944 +40 15 45.596941128       15.3   ~ 31 1
47 LEDA 2173127 BLL 09 03 14.7079441080 +40 55 59.851845660   19.53 18.60     ~ 47 1
48 PSO J136.5672-10.2406 AGN 09 06 16.13776800 -10 14 26.1806640           ~ 11 0
49 NVSS J091003-181611 Bla 09 10 03.8821999779 -18 16 12.534138105           ~ 12 0
50 NVSS J091429+684507 Bla 09 14 29.6838000415 +68 45 08.444893612           ~ 15 1
51 3FGL J0928.3-5255 AGN 09 28 18.62669 -52 57 03.0360           ~ 21 0
52 NVSS J093057-303116 Bla 09 30 57.8548797836 -30 31 18.455082798           ~ 12 0
53 1RXS J093330.2+722058 Q? 09 33 33.6734418878 +72 21 01.183817272           ~ 12 0
54 SDSS J093834.72+515452.3 Bla 09 38 34.7227349976 +51 54 52.371182736           ~ 19 0
55 4FGL J1008.2-1000 gam 10 08 16.1 -10 01 00           ~ 11 0
56 4FGL J1011.1-4420 gam 10 11 10.9 -44 20 49           ~ 8 0
57 4FGL J1016.2-5729 gam 10 16 13 -57 29.9           ~ 5 0
58 1RXS J101620.6-424733 BLL 10 16 20.6709126308 -42 47 22.568551406           ~ 28 0
59 1RXS J101751.0-270539 Bla 10 17 50.36304 -27 05 52.5660           ~ 12 1
60 4FGL J1018.1-4051 gam 10 18 10.3 -40 51 21           ~ 10 0
61 3FGL J1024.4-4545 AGN 10 24 32.4478735445 -45 44 27.686391981           ~ 19 0
62 1RXS J103438.7-464412 BL? 10 34 38.4805819655 -46 44 03.582284119           ~ 14 0
63 PMN J1048-5029 Bla 10 48 24.3475373627 -50 29 39.977201841           ~ 13 1
64 RX J1049.6+2742 Bla 10 49 38.7920168088 +27 42 13.037307156           ~ 23 0
65 NVSS J110636+362650 Bla 11 06 36.5335690824 +36 26 49.913709828   20.76 20.55     ~ 32 1
66 NVSS J111114+013427 Bla 11 11 14.2909908179 +01 34 28.294537138           ~ 12 0
67 NVSS J111948-100708 Bla 11 19 48.4170467086 -10 07 07.221653434           ~ 11 0
68 NVSS J112213-022913 BLL 11 22 13.7014064315 -02 29 14.227595179           ~ 13 0
69 NVSS J114600-063856 BLL 11 46 00.8591007005 -06 38 54.797803202           ~ 27 0
70 NVSS J115514-111118 BLL 11 55 14.8515316573 -11 11 22.629886020           ~ 21 0
71 NVSS J122014-245949 Bla 12 20 14.5466882952 -24 59 48.636719509           ~ 24 1
72 NVSS J124351+172643 Bla 12 43 51.7641295440 +17 26 44.379176820           ~ 13 0
73 SDSS J125630.43+533204.3 QSO 12 56 30.4438137528 +53 32 04.270465064           ~ 24 0
74 4FGL J1320.3-6410 gam 13 20 21 -64 10.4           ~ 5 0
75 4FGL J1326.0+3507 gam 13 26 00.2 +35 07 18           ~ 11 0
76 SDSS J141546.16-150229.0 BL? 14 15 46.1714142331 -15 02 29.020827737           ~ 11 0
77 2MASX J14294950-0733045 AGN 14 29 49.4792368533 -07 33 04.421700830           ~ 14 0
78 4FGL J1513.0-3118 gam 15 13 03.1 -31 18 05           ~ 9 0
79 NVSS J151436+445003 Bla 15 14 36.6304519848 +44 50 04.094172852   19.57 19.05 19.6   ~ 67 1
80 1RXS J152836.5+200423 Bla 15 28 35.7704227448 +20 04 20.131877748           ~ 21 0
81 1RXS J154458.3-664153 BLL 15 44 58.9212112900 -66 41 46.840538508           ~ 27 1
82 NVSS J155712+382027 Bla 15 57 12.2682581065 +38 20 32.925396404           ~ 12 0
83 2MASS J16233395-2317493 AG? 16 23 33.9388458907 -23 17 49.513772239           ~ 12 0
84 SDSS J163146.72+414632.6 BLL 16 31 46.7232416808 +41 46 32.742434568   20.18   19.86 19.68 ~ 15 0
85 NVSS J163738+300507 BLL 16 37 38.2842205168 +30 05 07.269452066           ~ 23 1
86 1RXS J164456.2+185204 BL? 16 44 57.1595981203 +18 51 49.103403771           ~ 11 0
87 NVSS J164500+165510 Bla 16 44 59.8012085015 +16 55 12.286911033           ~ 12 0
88 4FGL J1650.9-4420 gam 16 51 00 -44 20.2           ~ 5 0
89 SUMSS J165153-724305 Bla 16 51 52.0676720099 -72 43 06.917523616           ~ 10 0
90 2MASS J17203257-5144129 BL? 17 20 32.5828787322 -51 44 13.067608647           ~ 8 0
91 PSO J274.6301+25.6183 Bla 18 18 31.22501520 +25 37 06.1059000           ~ 20 0
92 4FGL J1820.4-1609 gam 18 20 25 -16 09.2           ~ 4 0
93 1FGL J1846.8-0233c gam 18 46 55.2 -02 27 08           ~ 18 1
94 NVSS J191052+285621 BLL 19 10 52.1652194158 +28 56 24.443797348           ~ 20 0
95 NVSS J191803+033032 Bla 19 18 03.6088258188 +03 30 30.334452021           ~ 12 0
96 NVSS J192729+015353 Bla 19 27 31.2005309491 +01 53 58.479092041           ~ 12 0
97 SUMSS J195512-503011 Bla 19 55 12.5799025427 -50 30 08.256903631           ~ 10 0
98 NVSS J200827+161846 Bla 20 08 27.8442810926 +16 18 42.717545092           ~ 10 0
99 SUMSS J204112-613949 Bla 20 41 12.0744289871 -61 39 49.360845593           ~ 11 0
100 PMN J2047-5412 Bla 20 47 00.7410669538 -54 12 45.531693820           ~ 14 1
101 NVSS J210936+395515 Bla 21 09 36.1688178798 +39 55 13.529796351           ~ 14 0
102 NVSS J211452-332533 Bla 21 14 52.0997455566 -33 25 33.608247816           ~ 13 0
103 4FGL J2159.6-4620 BL? 21 59 36.1238541905 -46 19 53.759407406           ~ 16 0
104 NVSS J220704+222234 BLL 22 07 04.1035680565 +22 22 31.365491918           ~ 15 0
105 2MASS J22225384+1510548 BL? 22 22 53.8521512509 +15 10 54.703518803           ~ 11 0
106 NVSS J222553-080412 Bla 22 25 53.16741 -08 04 14.6144           ~ 14 0
107 SUMSS J223709-672619 Bla 22 37 09.7550211225 -67 26 13.386285756           ~ 16 0
108 SUMSS J224017-524111 Bla 22 40 17.7297409195 -52 41 13.887030155           ~ 20 0
109 1RXS J224747.3-585444 Bla 22 47 45.1870939011 -58 54 57.647641802           ~ 12 0
110 NVSS J230352+555609 BLL 23 03 51.5689878056 +55 56 19.481755853           ~ 18 0
111 4FGL J2311.6-4427 BL? 23 11 46.0284325268 -44 32 20.553475771           ~ 11 0
112 NVSS J231740+283952 BLL 23 17 40.2260413340 +28 39 55.781368802           ~ 20 1
113 2MASS J23265307-4127112 Bz? 23 26 53.0651282439 -41 27 10.976378715           ~ 19 0
114 3FGL J2337.2-8425 AGN 23 36 27.6490458771 -84 26 51.896370602           ~ 21 0
115 NVSS J233730-290236 Bla 23 37 30.4572727280 -29 02 37.228703673           ~ 11 0
116 4FGL J2351.4-2818 gam 23 51 28.5 -28 18 42           ~ 16 0

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