2024ApJ...964...63S

Query : 2024ApJ...964...63S

2024ApJ...964...63S - Astrophys. J., 964, 63 (2024/March-3)

Revealing High-z Fermi-LAT BL Lacs Using Swift and SARA Data with Photometric Analysis.

SHENG Y., RAJAGOPAL M., KAUR A., AJELLO M., DOMINGUEZ A., RAU A., CENKO S.B., GREINER J., HARTMANN D.H., COX I., JOFFRE S., KARWIN C., McDANIEL A., SILVER R. and TORRES-ALBA N.

Abstract (from CDS):

BL Lacertae (BL Lac) objects are a subclass of blazar, distinguished by their featureless optical spectrum. The featureless spectrum presents a challenge in measuring the redshift of the BL Lacs. In this paper, we measure the redshift of BL Lacs using the photometric dropout technique. The space-based telescope Swift and the ground-based SARA telescopes are employed to provide magnitudes in the ${uvw}2,{uvm}2,{uvw}1,u,b,v,g^{\prime} ,r^{\prime} ,i^{\prime} ,{\rm{and}}\,z^{\prime} $ filters. We observe 60 BL Lacs and report reliable redshift upper limits for 41 of them. We discover three new high-z BL Lacs (z > 1.3) at redshifts of ${1.74}_{-0.08}^{+0.05}$, ${1.88}_{-0.03}^{+0.07}$, and ${2.10}_{-0.04}^{+0.03}$, bringing the number of high-z BL Lacs found by this method up to 19. Discussions are made on the implications for the blazar sequence, the Fermi blazar divide, and the gamma-ray horizon based on an analysis of the 4LAC catalog and all high-z BL Lacs found with the photo-z technique.

Abstract Copyright: © 2024. The Author(s). Published by the American Astronomical Society.

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

Simbad objects: 74

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Number of rows : 74
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 J000922+503028 BLL 00 09 22.7604063473 +50 30 28.834597215           ~ 47 0
2 2MASS J00192068-8152513 BLL 00 19 20.6452142904 -81 52 51.409221996           ~ 42 1
3 2MASS J00240672-6820546 Bla 00 24 06.7227818928 -68 20 54.585987180           ~ 41 1
4 3FGL J0244.4-8224 Bla 02 50 17.6 -82 24 13           ~ 23 0
5 2MASS J02510919-8226293 BLL 02 51 09.2350467168 -82 26 29.231412252           ~ 9 1
6 SUMSS J030115-561646 Bla 03 01 15.0863554486 -56 16 43.579319047           ~ 16 0
7 4C 47.08 BLL 03 03 35.24221958 +47 16 16.2754726   17.54 16.95 16.2   ~ 292 1
8 SUMSS J032009-704535 Bla 03 20 09.1494438712 -70 45 34.088709359           ~ 19 0
9 1RXS J050044.6+190308 Bz? 05 00 43.2278235834 +19 03 13.261565685           ~ 5 0
10 4FGL J0501.0+2424 Bz? 05 01 05.0 +24 24 41           ~ 17 0
11 NVSS J050106+242316 Rad 05 01 06.86 +24 23 16.4           ~ 1 0
12 RX J0706.5+3744 BLL 07 06 31.6968725328 +37 44 36.410415576           ~ 49 1
13 1FGL J0707.3+7742 BLL 07 06 51.3339102456 +77 41 36.996122563           ~ 36 0
14 4C 54.15 BLL 07 53 01.38457270 +53 52 59.6370830   18.5   16.77   ~ 173 1
15 ICRF J075426.4-114716 BLL 07 54 26.4562390440 -11 47 16.944994572       18.2   ~ 72 1
16 RX J0806.4+5931 BLL 08 06 25.9488552792 +59 31 06.910219092       15.7   ~ 64 1
17 6C 081218+574825 BLL 08 16 22.7274374136 +57 39 09.136267128   17.99 17.37 16.8   ~ 81 1
18 QSO B0836+182 BLL 08 39 30.7211930904 +18 02 47.140535040   17.96 17.31     ~ 98 1
19 87GB 084028.4+532346 BLL 08 44 11.6990889672 +53 12 50.586299640   19.01 18.48 18.3   ~ 53 1
20 [VV2006] J084932.6+045508 BLL 08 49 32.5494583152 +04 55 07.846563792   18.61 18.26     ~ 43 1
21 RX J0924.0+0533 BLL 09 24 01.0396071048 +05 33 45.408775212   18.96 18.65 18.2   ~ 43 1
22 ICRF J094221.4-075953 BLL 09 42 21.4615245552 -07 59 53.204006544       17.91   ~ 72 1
23 RX J1027.4+6317 BLL 10 27 24.9638658048 +63 17 53.066603832   19.28 18.76 16.8   ~ 43 1
24 2MASS J10323905+6623234 BLL 10 32 39.0802227120 +66 23 23.220022740   20.06 19.39 19.2   ~ 18 1
25 3FGL J1032.5+6623 Bla 10 32 43.9 +66 24 22           ~ 21 0
26 RX J1101.4+4108 BLL 11 01 24.7255808544 +41 08 47.386625064   19.44 18.96     ~ 45 1
27 MRC 1101-536 BLL 11 03 52.22168463 -53 57 00.6966389   18.30 17.9     ~ 91 1
28 ICRF J112758.8+362028 Bla 11 27 58.87083269 +36 20 28.3514025   20.86 20.52 20.05   ~ 93 1
29 6C 122223+435147 BLL 12 24 51.50530154 +43 35 19.2873713   21.12 20.66 20.2   ~ 90 3
30 [VV2006] J124510.0+570954 BLL 12 45 09.9995503080 +57 09 54.373550040   18.33 17.96     ~ 72 1
31 2FGL J1249.9+3705 BLL 12 49 46.7512275600 +37 07 47.911860480       18.9   ~ 45 0
32 SDSS J125630.43+533204.3 QSO 12 56 30.4438137528 +53 32 04.270465064           ~ 24 0
33 NVSS J125638+533423 Rad 12 56 38.6310 +53 34 23.741           ~ 7 1
34 LBQS 1308+0051 BLL 13 11 06.4762326096 +00 35 10.045283820   18.53 18.01     ~ 60 0
35 3FGL J1327.9+2524 Bla 13 27 58 +25 24.1           ~ 18 0
36 NVSS J132758+252750 Rad 13 27 58.65 +25 27 50.3           ~ 2 0
37 2FGL J1358.0+0137 BLL 13 57 38.6981776176 +01 28 13.630939788   18.62 18.01 17.5   ~ 57 1
38 FIRST J141927.4+044513 BLL 14 19 27.5002614096 +04 45 13.731125256   18.80 18.31     ~ 60 0
39 NVSS J142129-165448 AGN 14 21 28.9917984686 -16 54 56.085182559           ~ 11 0
40 ATO J216.0395+04.5811 BLL 14 24 09.5010350904 +04 34 52.086345600   18.8 17.92 18.4   ~ 41 1
41 3FGL J1424.3+0434 Bla 14 24 12.2 +04 33 46           ~ 21 0
42 87GB 142357.8+341753 BLL 14 26 07.7161839912 +34 04 26.325178284   17.99 17.51 17.38 17.12 ~ 78 2
43 PMN J1439-2341 BL? 14 39 59.4426367182 -23 41 40.992438791           ~ 23 1
44 ICRF J144553.3-162901 BLL 14 45 53.37630149 -16 29 01.6191263   20.5   20.09   ~ 70 1
45 3FGL J1446.1-1628 Bla 14 45 59.5 -16 26 59           ~ 20 0
46 RX J1454.4+5124 BLL 14 54 27.1245711624 +51 24 33.731127900   18.76 18.35     ~ 103 1
47 87GB 150825.5+560806 BLL 15 09 47.9502341856 +55 56 17.288589588   17.2 17.91 17.2   ~ 79 2
48 9Y-MST J1530+5735 BLL 15 30 58.1990875680 +57 36 25.278185160   20.06 19.55 19.1   ~ 46 1
49 RX J1533.4+3416 BLL 15 33 24.2707322904 +34 16 40.306756692   18.59 18.31 18.1   ~ 62 0
50 RX J1535.0+5320 BLL 15 35 00.7962236712 +53 20 37.302992988   19.18 18.75 18.8   ~ 73 1
51 3FGL J1550.3+7409 Bla 15 49 25.3 +74 09 59           ~ 19 0
52 87GB 155014.9+741816 BLL 15 49 27.3061669848 +74 09 32.171737032           ~ 7 1
53 BWE 1549+6319 BLL 15 49 57.3176547240 +63 10 07.326262128           ~ 32 1
54 SDSS J154958.45+631021.2 Opt 15 49 58.45616 +63 10 21.3015           ~ 1 0
55 ATO J247.6797+52.3607 BLL 16 30 43.1466624264 +52 21 38.623784940       17.8   ~ 52 1
56 1RXS J163717.1+131418 BLL 16 37 16.7397764544 +13 14 38.783839668   19.61 19.09 18.3   ~ 31 0
57 RX J1651.6+7218 BLL 16 51 39.9479689704 +72 18 24.862513140           ~ 42 2
58 3FHL J1830.0+1323 BLL 18 30 00.7622361288 +13 24 14.327147592           ~ 44 1
59 RX J1848.7+4245 BLL 18 48 47.1243279480 +42 45 39.352045248       17.8   ~ 44 1
60 6C 192647+611105 BLL 19 27 30.4428785736 +61 17 32.878880988   17.5 17.5 16.99   ~ 139 1
61 PKS 2000-776 rG 20 07 06.4549722696 -77 30 42.249206052           ~ 10 1
62 3FGL J2007.7-7728 Bla 20 07 23.2 -77 28 41           ~ 21 0
63 3FGL J2012.1-1643 Bz? 20 12 17.3 -16 46 22           ~ 15 0
64 PMN J2012-1646 rG 20 12 30.1794553481 -16 46 50.475270498           ~ 9 1
65 ATPMN J210744.4-482802 BLL 21 07 44.48871 -48 28 02.8313           ~ 24 0
66 QSO B2136-428 BLL 21 39 24.1733820912 -42 35 20.465859048   16.50 16.2 15.7   ~ 97 1
67 3FGL J2149.6+1915 Bla 21 49 46.6 +19 17 09           ~ 21 0
68 BWE 2147+1906 Bla 21 49 47.2489767024 +19 20 46.329074304           ~ 7 1
69 NVSS J220008+103007 rG 22 00 07.93322570 +10 30 07.9028858           ~ 59 1
70 NVSS J223554-362901 rG 22 35 54.83266 -36 29 02.8818           ~ 35 0
71 WISE J223605.64-505519.9 Rad 22 36 05.64 -50 55 20.0           ~ 3 0
72 3FGL J2236.2-5049 Bla 22 36 14 -50 49.7           ~ 10 0
73 ICRF J224107.2+412011 BLL 22 41 07.2051716400 +41 20 11.617123020       18.89   ~ 52 1
74 3FHL J2241.2+4120 Bla 22 41 14.1 +41 20 23           ~ 22 0

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