2020ApJ...891...87K

Query : 2020ApJ...891...87K

2020ApJ...891...87K - Astrophys. J., 891, 87-87 (2020/March-1)

An empirical "high-confidence" candidate zone for Fermi BL Lacertae objects.

KANG S.-J., ZHU K., FENG J., WU Q., ZHANG B.-B., YIN Y., WANG F.-F., LIU Y. and ZHENG T.-Y.

Abstract (from CDS):

In the third catalog of active galactic nuclei detected by the Fermi Large Area Telescope Clean (3LAC) sample, there are 402 blazar candidates of uncertain type (BCU). The proposed analysis will help to evaluate the potential optical classification flat spectrum radio quasars (FSRQs) versus BL Lacertae (BL Lac) objects of BCUs, which can help to understand which is the most elusive class of blazar hidden in the Fermi sample. By studying the 3LAC sample, we found some critical values of γ-ray photon spectral index (Γph), variability index (VI), and radio flux (FR) of the sources separate known FSRQs and BL Lac objects. We further utilize those values to defined an empirical "high-confidence" candidate zone that can be classified as BCUs. Within such a zone (Γph < 2.187, log FR < 2.258, and log VI < 1.702), we found that 120 BCUs can be classified as BL Lac object candidates with a higher degree of confidence (with a misjudged rate <1%). Our results suggest that an empirical "high-confidence" diagnosis is possible to distinguish the BL Lac objects from the Fermi observations based on only the direct observational data of Γph, VI, and FR.

Abstract Copyright: © 2020. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Blazars - BL Lacertae objects

Simbad objects: 120

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Number of rows : 120
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 1RXS J000320.4-524727 BLL 00 03 19.5968903177 -52 47 27.278010635           ~ 36 1
2 3FGL J0017.2-0643 BLL 00 17 03.2 -06 49 54           ~ 26 0
3 NVSS J003119+072456 BLL 00 31 19.7096957544 +07 24 53.560153296   19.8   18.6   ~ 42 1
4 3FHL J0039.2+4330 BLL 00 39 08.147 +43 30 14.64           ~ 37 0
5 PMN J0039-2220 BLL 00 39 08.2102455744 -22 20 01.478410368   16.29       ~ 63 1
6 RX J0040.2+4049 BLL 00 40 13.8112928443 +40 50 04.756997684     19.30 19.9   ~ 80 1
7 3FGL J0040.5-2339 BLL 00 40 24.9055196832 -23 40 00.774301332       16.3   ~ 35 1
8 1RXS J004333.7-044257 BLL 00 43 34.1227337381 -04 43 00.632192880           ~ 34 1
9 PHL 2911 BLL 00 43 48.6669688632 -11 16 07.314922956   18.4   17.9   ~ 36 1
10 PMN J0051-6242 BLL 00 51 16.6464761530 -62 42 04.408098612 17.50 17.42 17.38   16.493 ~ 59 1
11 2MASS J01071178-1211229 BLL 01 07 11.7845031066 -12 11 23.429945898           ~ 31 1
12 1RXS J011555.6-274428 BLL 01 15 55.4728278744 -27 44 31.787590668   19.79       ~ 35 1
13 3FGL J0121.7+5154 BLL 01 21 45.3 +51 53 41           ~ 25 0
14 1RXS J012712.6+032250 BLL 01 27 13.9561096712 +03 23 00.587171321           ~ 39 0
15 3FGL J0139.9+8735 BLL 01 39 12.3191843905 +87 37 57.629273117           ~ 29 0
16 PMN J0150-5450 BLL 01 50 44.5339581141 -54 50 05.057783770           ~ 30 1
17 2MASS J01564603-4744174 BLL 01 56 46.03416 -47 44 17.4156           ~ 27 0
18 LEDA 1029376 BLL 02 11 16.95 -06 44 19.8           ~ 29 0
19 3FGL J0213.1-2720 BLL 02 12 49.3 -27 21 46           ~ 20 0
20 9Y-MST J0228-3100 BLL 02 28 14.4 -31 02 02           ~ 26 0
21 9Y-MST J0232+2609 BLL 02 32 59.5 +26 08 13           ~ 22 0
22 BWE 0253+0522 BLL 02 55 49.5140473680 +05 33 55.054257336           ~ 29 1
23 3FGL J0301.8-2721 BLL 03 01 59.8 -27 31 49           ~ 18 0
24 3FGL J0342.6-3006 BLL 03 42 50.2 -30 07 43           ~ 22 0
25 1RXS J043148.3+740306 BLL 04 31 45.0757682224 +74 03 26.719292313           ~ 28 0
26 1RXS J043439.3+092407 BLL 04 34 40.9908221688 +09 23 48.719917433           ~ 32 1
27 PKS J0439-3210 BLL 04 39 33.8998711307 -32 10 11.011367783           ~ 41 1
28 RX J0506.9-5435 BLL 05 06 57.8154316665 -54 35 03.822937816 17.60 17.25 17.14   15.822 ~ 62 0
29 NVSS J051533-012354 BLL 05 15 33.1923665021 -01 23 55.203796362           ~ 24 0
30 4FGL J0602.8-4019 BLL 06 02 51.2904218280 -40 18 45.335282580           ~ 44 0
31 1RXS J061105.7+432352 BLL 06 11 06.59117 +43 23 57.4542           ~ 30 1
32 AT20G J062607-425332 BLL 06 26 07.91 -42 53 32.2           ~ 40 1
33 1RXS J064933.8-313914 BLL 06 49 33.5989252036 -31 39 20.286354937           ~ 45 0
34 1RXS J065201.0-480858 BLL 06 52 00.5782857506 -48 08 59.404031305           ~ 32 1
35 PMN J0730-6602 BLL 07 30 49.5588000264 -66 02 18.881436948   17.98   16.44   ~ 46 1
36 SUMSS J074221-813138 BLL 07 42 21.1248594729 -81 31 36.186597143           ~ 15 0
37 1RXS J074707.6+851211 BLL 07 47 16.1527432872 +85 12 08.624543324           ~ 38 0
38 PMN J0827-0708 BLL 08 27 06.1674878360 -07 08 45.896270800           ~ 34 1
39 1RXS J091714.7-034302 BLL 09 17 14.5955965464 -03 43 14.436960996           ~ 35 0
40 1RXS J092057.2-225716 BLL 09 20 57.4792644359 -22 57 21.376854316           ~ 29 0
41 1RXS J094709.2-254056 BLL 09 47 09.5246143707 -25 41 00.028172607           ~ 45 1
42 RX J0953.1-7657 BLL 09 53 04.3615472853 -76 58 02.120566089           ~ 38 0
43 RX J1040.9+1342 BLL 10 40 58.3765733673 +13 41 50.635572203           ~ 29 0
44 4FGL J1042.1-4128 BLL 10 42 03.01781 -41 29 29.7524           ~ 27 0
45 PMN J1042-0558 BLL 10 42 04.3043371329 -05 58 16.621198422         17.856 ~ 25 1
46 CRATES J105302-374336 BLL 10 52 58.10 -37 43 18.4           ~ 26 1
47 PMN J1125-2100 BLL 11 25 08.6221054181 -21 01 06.003979244           ~ 33 1
48 1RXS J114118.3+680433 BLL 11 41 18.48851 +68 04 29.8660           ~ 33 1
49 1RXS J114142.2-140757 BLL 11 41 41.8080282552 -14 07 54.754153248           ~ 44 1
50 CRTS CSS120316 J115338-255413 Bla 11 53 38.4583829500 -25 54 13.177165744           ~ 26 0
51 NVSS J115520-341718 BLL 11 55 20.5207687737 -34 17 19.912554057           ~ 31 0
52 NVSS J115633-225004 BLL 11 56 33.2370108576 -22 50 04.434665876           ~ 32 1
53 RX J1158.8+0819 BLL 11 58 53.1939112872 +08 19 43.216013352           ~ 29 0
54 9Y-MST J1159-0724 BLL 11 59 35.6 -07 23 26           ~ 20 0
55 PMN J1203-3926 BLL 12 03 17.8841329030 -39 26 21.070223927           ~ 36 1
56 3FGL J1207.6-4537 gam 12 07 29.6 -45 36 45           ~ 19 0
57 NVSS J122337-303246 BLL 12 23 37.0129833335 -30 32 50.147020048           ~ 31 0
58 3FGL J1258.7+5137 BLL 12 58 46.7 +51 43 06           ~ 22 0
59 RX J1315.0-4236 BLL 13 15 03.3912307368 -42 36 49.760844084   18.07   16.59   ~ 114 0
60 RX J1315.5+1133 Bla 13 15 32.6158534392 +11 33 31.682583612           ~ 32 1
61 SDSS J134240.01+094752.3 BLL 13 42 40.01995 +09 47 52.3675           ~ 31 0
62 NVSS J134706-295840 BLL 13 47 06.8796040152 -29 58 42.451666536           ~ 42 1
63 3FGL J1356.3-4029 BLL 13 56 19 -40 29.3           ~ 12 0
64 NVSS J140609-250808 BLL 14 06 09.6096123648 -25 08 09.373534872           ~ 39 0
65 9Y-MST J1427-3217 BLL 14 27 47.1 -32 15 13           ~ 20 0
66 1RXS J143442.0+664031 BLL 14 34 41.5063906693 +66 40 26.538464502           ~ 25 0
67 2MASS J14395085-3955185 BLL 14 39 50.85960 -39 55 18.5988           ~ 30 0
68 1RXS J144645.0-182938 BLL 14 46 44.8240962463 -18 29 24.992466992           ~ 27 1
69 3FGL J1507.6-3710 BLL 15 07 20.8116025251 -37 09 03.020415990           ~ 29 1
70 NVSS J151148-051345 BLL 15 11 48.5608046106 -05 13 46.988172935         18.327 ~ 44 1
71 1RXS J151213.1-225515 BLL 15 12 12.7550572416 -22 55 08.480690292   18.5   18.0   ~ 36 1
72 PMN J1539-1128 BLL 15 39 41.1987284184 -11 28 35.428726344         16.848 ~ 38 1
73 1RXS J154711.8-280222 BLL 15 47 12.1334067054 -28 02 21.574954693           ~ 28 1
74 NVSS J154952-065907 BLL 15 49 52.0440165168 -06 59 07.919771748   19.8   18.5 18.021 ~ 39 0
75 NVSS J160005-252439 BLL 16 00 05.3678268826 -25 24 39.803917047           ~ 29 1
76 2FGL J1626.0-7636 BLL 16 26 38.1673375632 -76 38 55.602796812           ~ 43 1
77 SDSS J163651.46+262656.8 BLL 16 36 51.469 +26 26 56.86           ~ 21 0
78 1RXS J164328.1-064627 BLL 16 43 28.9223009616 -06 46 19.767702828           ~ 48 0
79 1RXS J165655.0-201049 BLL 16 56 55.1472819362 -20 10 56.345720505           ~ 35 1
80 1RXS J171405.2-202747 BLL 17 14 05.44464 -20 27 52.9362           ~ 34 0
81 1RXS J171643.8+884414 BLL 17 15 53.5028646882 +88 44 15.251457957           ~ 24 0
82 9Y-MST J1717-8115 BLL 17 17 31.8 -81 14 19           ~ 25 0
83 1RXS J171921.2+120711 BLL 17 19 21.4981636892 +12 07 21.942105019           ~ 32 1
84 3FHL J1735.5-1118 BLL 17 35 27.18 -11 17 34.5           ~ 41 1
85 9Y-MST J1740+5346 BLL 17 40 38.2 +53 46 12           ~ 24 0
86 QSO J1756+1535 BLL 17 56 53.10213899 +15 35 20.8265134       17.17   ~ 67 2
87 1RXS J182021.1+362350 BLL 18 20 20.9864878632 +36 23 43.199467800           ~ 41 1
88 SDSS J182419.05+430949.5 BLL 18 24 19.0466236321 +43 09 49.396418758           ~ 45 1
89 PMN J1838-6000 BLL 18 38 06.7601933595 -60 00 32.009060520           ~ 28 1
90 RX J1841.3+2909 BLL 18 41 21.7201454496 +29 09 41.032048536   17.6   16.7   ~ 42 1
91 CRATES J184803-423049 BLL 18 48 06.19 -42 30 27.2           ~ 28 1
92 3FHL J1854.6-6008 BLL 18 54 41.1 -60 07 36           ~ 23 0
93 RX J1904.2+3627 BLL 19 04 11.8663392936 +36 26 58.921335672           ~ 39 1
94 1RXS J191401.9+443849 BLL 19 14 01.8842356589 +44 38 32.250742633           ~ 34 0
95 9Y-MST J1939-4926 BLL 19 39 51.2 -49 28 04           ~ 25 0
96 1RXS J194422.6-452326 BLL 19 44 22.3904632368 -45 23 32.530725708           ~ 43 1
97 2MASS J19550065-1603387 BLL 19 55 00.6642229003 -16 03 38.839917683           ~ 41 1
98 1RXS J195503.1-564031 BLL 19 55 02.8617649615 -56 40 28.814904257           ~ 41 1
99 3FHL J1955.7+0214 BLL 19 55 54 +02 12.4           ~ 13 0
100 1RXS J195945.8-472531 BLL 19 59 45.6659618232 -47 25 19.352198028 17.13 16.94 16.92     ~ 48 0
101 1RXS J200245.4+630226 BLL 20 02 45.3460785336 +63 02 33.120412620   21.6   20.7   ~ 37 0
102 1RXS J201431.2+064842 BLL 20 14 31.0874432885 +06 48 52.311655421           ~ 41 0
103 9Y-MST J2017-4111 BLL 20 17 34.2 -41 13 58           ~ 23 0
104 1RXS J202633.4+764432 BLL 20 26 30.7894405659 +76 44 48.488456231           ~ 28 0
105 RX J2030.8+1935 BLL 20 30 57.1340134032 +19 36 12.930528420           ~ 59 2
106 1RXS J203650.9-332817 Bla 20 36 49.5067800072 -33 28 30.648490788           ~ 38 0
107 CRATES J204653-101050 BLL 20 46 54.32 -10 10 40.2           ~ 28 1
108 1RXS J210421.1-021233 BLL 21 04 21.9297718701 -02 12 39.017772325           ~ 32 1
109 NVSS J213314+252858 BLL 21 33 14.3614671839 +25 28 59.125195032           ~ 37 0
110 ICRF J221239.1+275938 BLL 22 12 39.10311392 +27 59 38.4496223           ~ 55 1
111 2FGL J2213.7-4754 BLL 22 13 30.3519050040 -47 54 25.261457760           ~ 38 0
112 RX J2220.4+2814 BLL 22 20 28.7263652256 +28 13 55.675566804           ~ 38 1
113 1RXS J223249.5-202232 BLL 22 32 48.7981989312 -20 22 26.127442200           ~ 32 0
114 3FGL J2243.2-3933 BLL 22 43 31.0 -39 31 04           ~ 18 0
115 9Y-MST J2251-4928 BLL 22 51 28.6971348168 -49 29 11.135695488           ~ 36 1
116 2MASS J23051243-4218574 BLL 23 05 12.4392440870 -42 18 57.237388234           ~ 14 1
117 1RXS J231349.9-692324 BLL 23 13 47.8908563780 -69 23 31.053472778           ~ 31 0
118 3FGL J2316.8-5209 BLL 23 17 01.72 -52 10 01.4           ~ 24 0
119 1RXS J232256.7-491658 BLL 23 22 54.4278625059 -49 16 30.398778875           ~ 42 1
120 3FGL J2353.3-4805 BLL 23 53 09.4 -48 06 39           ~ 23 0

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