2017ApJ...834...41K

Query : 2017ApJ...834...41K

2017ApJ...834...41K - Astrophys. J., 834, 41-41 (2017/January-1)

New high-z Fermi BL Lacs with the photometric dropout technique.

KAUR A., RAU A., AJELLO M., GREINER J., HARTMANN D.H., PALIYA V.S., DOMINGUEZ A., BOLMER J. and SCHADY P.

Abstract (from CDS):

Determining redshifts for BL Lacertae (BL Lac) objects using the traditional spectroscopic method is challenging due to the absence of strong emission lines in their optical spectra. We employ the photometric dropout technique to determine redshifts for this class of blazars using the combined 13 broadband filters from Swift-UVOT and the multi-channel imager GROND at the MPG 2.2 m telescope at ESO's La Silla Observatory. The wavelength range covered by these 13 filters extends from far-ultraviolet to the near-infrared. We report results on 40 new Fermi-detected BL Lacs with the photometric redshift determinations for five sources, with 3FGL J1918.2-4110 being the most distant in our sample at z = 2.16. Reliable upper limits are provided for 20 sources in this sample. Using the highest energy photons for these Fermi-LAT sources, we evaluate the consistency with the gamma-ray horizon due to the extragalactic background light.

Abstract Copyright: © 2016. The American Astronomical Society. All rights reserved.

Journal keyword(s): BL Lacertae objects: general - galaxies: active - gamma rays: diffuse background - gamma rays: diffuse background

Simbad objects: 48

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Number of rows : 48
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 ICRF J021717.1+083703 BLL 02 17 17.1248727600 +08 37 03.897374052     17.90 14.68   ~ 118 1
2 PMN J0331-6155 BLL 03 31 18.4490014280 -61 55 28.995787727           ~ 35 1
3 2MASS J05054158-1558381 BLL 05 05 41.5803252020 -15 58 38.140551120           ~ 33 1
4 1RXS J052542.0-601337 BLL 05 25 42.4313688480 -60 13 40.135997408           ~ 40 0
5 PMN J0630-2406 BLL 06 30 59.5217586120 -24 06 46.204083144 16.48 16.22 16.04 16   ~ 97 1
6 PMN J0640-1253 BLL 06 40 07.1821661088 -12 53 15.408624624           ~ 52 1
7 RX J0708.9+2241 BLL 07 08 58.2894477720 +22 41 35.498077728           ~ 52 1
8 PMN J0730-6602 BLL 07 30 49.5588000264 -66 02 18.881436948   17.98   16.44   ~ 46 1
9 QSO J0738+1742 BLL 07 38 07.39375312 +17 42 18.9981506   16.76 16.22 15.78   ~ 1045 1
10 3FHL J0842.0-6101 Bla 08 42 23.5 -60 53 31           ~ 25 0
11 ICRF J084226.5-605350 BLL 08 42 26.56110368 -60 53 50.4015168           ~ 16 1
12 ICRF J084756.7-070316 BLL 08 47 56.7374192472 -07 03 16.903216008     16.40 15.35   ~ 85 1
13 PKS 0944-757 Rad 09 44 49.5 -75 58 21           ~ 1 0
14 NVSS J105912-113422 BLL 10 59 12.4263597024 -11 34 22.779475140     17.5 16.2   ~ 89 1
15 Z 184-50 BLL 11 04 27.3140835504 +38 12 31.798495872   13.50 12.90 8.31   ~ 2841 1
16 RX J1107.8+1502 BLL 11 07 48.0634235400 +15 02 10.558629456     18.20     ~ 70 1
17 9Y-MST J1200+0202 BLL 12 00 12.346 +02 02 08.41           ~ 29 0
18 AT20G J122535-731339 BLL 12 25 35.33 -73 13 40.2           ~ 6 1
19 3FGL J1225.7-7314 Bz? 12 25 37.9 -73 13 56           ~ 20 0
20 ICRF J122654.4-132838 BLL 12 26 54.4188363120 -13 28 38.987013756       20.26   ~ 70 1
21 7C 1252+2227 BLL 12 54 33.2739157176 +22 11 03.647269968   18.0   17.7   ~ 44 1
22 2FGL J1256.5-1145 BLL 12 56 15.9520325496 -11 46 37.335959904   16.39   15.07   ~ 67 1
23 QSO B1309-216 BLL 13 12 31.5548352888 -21 56 23.389976472 17.56 17.27 17.18     ~ 95 1
24 PMN J1328-4728 BLL 13 28 40.6236883896 -47 27 49.456920852           ~ 53 1
25 ICRF J133011.0-700313 QSO 13 30 11.07682393 -70 03 13.0780871   20.7       ~ 45 1
26 1FGL J1338.9+1153 BLL 13 38 59.0526428808 +11 53 16.698357420   18.37 18.00 16.8   ~ 46 1
27 PG 1424+240 BLL 14 27 00.3917926224 +23 48 00.037510776 14.52 14.34 14.95 14.5   ~ 420 1
28 1RXS J152049.3-034845 BLL 15 20 48.9055251623 -03 48 51.669744514       18.1 16.194 ~ 45 1
29 PMN J1532-1319 Bla 15 32 45.37473348 -13 19 10.0860403       22.20   ~ 72 1
30 ICRF J155203.2+085047 BLL 15 52 03.2616646800 +08 50 47.340192588   18.60 18.15 19.3   ~ 77 1
31 2FGL J1553.5-3116 BLL 15 53 33.5452374288 -31 18 31.423004316       15.7   ~ 53 1
32 PG 1553+113 BLL 15 55 43.0440048528 +11 11 24.365649948 14.91 14.72 14.57 13.99   ~ 672 1
33 87GB 155744.0+232525 BLL 15 59 52.2025713192 +23 16 56.726642892   18.11 17.67 18.7   ~ 15 1
34 9Y-MST J1559+2319 Bla 15 59 54.6 +23 19 11           ~ 20 0
35 PMN J1610-6649 BLL 16 10 46.4616120633 -66 49 01.270817318       16.8   ~ 63 1
36 ICRF J164737.7-643800 Bla 16 47 37.7415138624 -64 38 00.268029024   20.05   18.70   ~ 57 1
37 2FGL J1918.2-4110 BLL 19 18 16.0594214640 -41 11 31.037680572       17.3   ~ 57 1
38 ICRF J194559.3-311138 BLL 19 45 59.3693071560 -31 11 38.356706724       18   ~ 56 1
39 ICRF J202226.4-451329 BLL 20 22 26.4128868408 -45 13 29.549413884           ~ 50 1
40 SUMSS J203451-420024 BLL 20 34 51.0909972120 -42 00 38.437476084           ~ 43 1
41 1RXS J205528.2-002123 BLL 20 55 28.2308834496 -00 21 17.159442048   18.3 18.07 18.5   ~ 65 1
42 3FGL J2131.1-6625 Bz? 21 30 48.8 -66 23 15           ~ 18 0
43 PMN J2132-6624 Rad 21 32 37.30 -66 24 28.0           ~ 4 1
44 2FGL J2143.2-3929 BLL 21 43 02.8672227552 -39 29 24.921692880       18   ~ 47 1
45 PHL 1744 BLL 21 46 36.9607739613 -13 44 00.663328644   17.6       ~ 46 0
46 PKS J2158-3013 BLL 21 58 52.0652249880 -30 13 32.118447792   13.36 13.09 12.62   ~ 1829 1
47 ICRF J224730.1+000006 BLL 22 47 30.19599756 +00 00 06.4623909   20.01 19.27 18.17   ~ 93 1
48 2FGL J2334.8+1431 BLL 23 34 53.8361988120 +14 32 14.770706172   19.34 18.52 18.4   ~ 47 1

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