2020MNRAS.497...94P

Query : 2020MNRAS.497...94P

2020MNRAS.497...94P - Mon. Not. R. Astron. Soc., 497, 94-108 (2020/September-1)

Optical spectroscopy of BL Lac objects: TeV candidates.

PAIANO S., FALOMO R., TREVES A. and SCARPA R.

Abstract (from CDS):

We investigate the spectroscopic optical properties of gamma-ray sources detected with high significance above 50 GeV in the Third Catalog of Hard Fermi-LAT Sources and that are good candidates as TeV emitters. We focus on the 91 sources that are labelled by the Fermi team as BL Lac (BLL) objects or blazar candidates of uncertain type (BCUs), are in the Northern hemisphere, and are with unknown or uncertain redshift. We report here on GTC (Gran Telescopio Canarias) spectra (in the spectral range 4100-7750 Å) of 13 BCUs and 42 BLL objects. We are able to classify the observed targets as BLL objects and each source is briefly discussed. The spectra allowed us to determine the redshift of 25 objects on the basis of emission and/or absorption lines, finding 0.05 < z < 0.91. Most of the emission lines detected are due to forbidden transition of [O III] and [N II]. The observed line luminosity is found to be lower than that of quasi-stellar objects (QSOs) at similar continuum and could be reconciled with the line-continuum luminosity relationship of QSOs if a significant beaming factor is assumed. Moreover, for five sources we found intervening absorption lines that allow to set a spectroscopic lower limit of the redshift. For the remaining 25 sources, for which the spectra are lineless, a lower limit to z is given, assuming that the host galaxies are giant ellipticals.

Abstract Copyright: © 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

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

Simbad objects: 56

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Number of rows : 56
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 RX J0015.6+5551 BLL 00 15 40.1501873433 +55 51 44.665947351           ~ 40 1
3 RX J0045.3+2127 BLL 00 45 19.2982391160 +21 27 40.001545080 17.37 17.33 17.01 17.3   ~ 85 1
4 RX J0045.6+1217 BLL 00 45 43.3406310768 +12 17 11.804448120           ~ 54 1
5 RX J0131.1+6120 BLL 01 31 07.2257589038 +61 20 33.372505609           ~ 54 0
6 RX J0134.4+2638 BLL 01 34 28.1946775464 +26 38 43.010995272   17.1   15.9   ~ 62 1
7 RX J0137.7+5814 BLL 01 37 50.4761854680 +58 14 11.321731860           ~ 66 2
8 1RXS J014126.8-092857 BLL 01 41 25.83216015 -09 28 43.6742470   16.94 16.55 17.21   ~ 302 1
9 NVSS J014820+520205 BLL 01 48 20.3367706981 +52 02 05.125897724           ~ 36 1
10 RX J0241.3+6543 BLL 02 41 21.7468157232 +65 43 11.576921016           ~ 38 1
11 RX J0250.6+1712 BLL 02 50 37.9604160096 +17 12 08.881094160   17.7 17.50     ~ 74 1
12 RX J0321.9+2336 BLL 03 21 59.9703031416 +23 36 11.206732680     16.80 16.4   ~ 73 1
13 NVSS J042355+415003 BLL 04 23 56.00979158 +41 50 02.7129362   19   19.2   ~ 123 1
14 1RXS J043307.7+322838 Bla 04 33 07.5510921953 +32 28 40.833902968           ~ 10 1
15 RX J0433.6+2906 BLL 04 33 37.82985981 +29 05 55.4770576   19.0 17.80 17.06   ~ 181 1
16 NVSS J043340+323711 BLL 04 33 40.6870659288 +32 37 12.009757908       19.1   ~ 52 1
17 1RXS J043439.3+092407 BLL 04 34 40.9908221688 +09 23 48.719917433           ~ 32 1
18 AX J0050.3+5238 BLL 05 00 21.4163213773 +52 38 02.158896356           ~ 31 1
19 RX J0506.0+6113 BLL 05 05 58.7847983400 +61 13 35.957739216           ~ 50 2
20 NVSS J051547+152716 BLL 05 15 47.3535758902 +15 27 16.593670679       18.1   ~ 44 1
21 1RXS J054030.8+582339 BLL 05 40 30.0094967101 +58 23 38.459367179       16.065   ~ 51 1
22 1RXS J060014.8+124341 Bla 06 00 14.9961644636 +12 43 43.180285042           ~ 22 1
23 B2 0557+38 BLL 06 01 02.8707695475 +38 38 29.169121958           ~ 50 1
24 1RXS J060200.7+531612 BLL 06 02 00.4452373872 +53 16 00.045905232           ~ 47 1
25 NVSS J060723+473947 BLL 06 07 23.2550008416 +47 39 46.944292500       16.38   ~ 91 1
26 NVSS J061251+412237 BLL 06 12 51.1851596976 +41 22 37.408102212       15.71   ~ 99 2
27 RX J0620.6+2643 BLL 06 20 40.0590573192 +26 43 31.898449668           ~ 38 1
28 PMN J0640-1253 BLL 06 40 07.1821661088 -12 53 15.408624624           ~ 52 1
29 NVSS J070242-195123 BLL 07 02 42.90066398 -19 51 22.0355917           ~ 68 1
30 RX J0706.5+3744 BLL 07 06 31.6968725328 +37 44 36.410415576           ~ 49 1
31 RX J0708.9+2241 BLL 07 08 58.2894477720 +22 41 35.498077728           ~ 52 1
32 1RXS J070912.3-152708 BLL 07 09 12.5169059063 -15 27 03.459716375           ~ 43 1
33 PMN J0723-0732 BLL 07 22 59.6830149360 -07 31 34.812590160           ~ 41 1
34 PMN J0811+0237 BLL 08 12 01.8570721368 +02 37 33.086136180           ~ 47 1
35 PMN J0816-1311 BLL 08 16 27.2037492048 -13 11 52.623678156 17.15 17.09 17.00 16.93   ~ 80 1
36 NVSS J090535+135803 BLL 09 05 34.9904763192 +13 58 06.327510888 17.12 16.83 16.82 16.3   ~ 67 1
37 Ton 1015 BLL 09 10 37.0353299208 +33 29 24.418940568   16.19 15.71 15.9   ~ 100 2
38 PMN J0953-0840 BLL 09 53 02.7095643576 -08 40 18.360856776 16.99 16.73 16.69 17.4   ~ 82 1
39 RX J1037.7+5711 BLL 10 37 44.3078432736 +57 11 55.629345156   17.05 16.54 16.7   ~ 131 1
40 RX J1055.5-0126 BLL 10 55 34.3694040000 -01 26 16.303689636   18.86 18.54 18.8   ~ 40 0
41 NVSS J105912-113422 BLL 10 59 12.4263597024 -11 34 22.779475140     17.5 16.2   ~ 89 1
42 RX J1150.5+4154 BLL 11 50 34.7545571856 +41 54 40.046355864   17.58 17.13     ~ 73 1
43 NVSS J123341-014426 BLL 12 33 41.3342161329 -01 44 23.711099800 19.16 18.87 18.46 18.22   ~ 51 0
44 1RXS J125311.9+530105 BLL 12 53 11.9204702472 +53 01 11.737422696   18.07 17.51 16.4   ~ 143 1
45 NVSS J141826-023336 BLL 14 18 26.3272568400 -02 33 34.142899320 16.00 15.85 15.63 16.62   ~ 63 0
46 1RXS J144505.9-032613 BLL 14 45 06.2306796384 -03 26 12.733498104     17.2 17.9   ~ 50 1
47 RX J1448.0+3608 BLL 14 48 00.5826450192 +36 08 31.165443852   17.31 16.88 16.2   ~ 89 1
48 RX J1454.4+5124 BLL 14 54 27.1245711624 +51 24 33.731127900   18.76 18.35     ~ 103 1
49 1RXS J150343.0-154107 BLL 15 03 40.6675186296 -15 41 14.140402188     18.10 17.2   ~ 79 1
50 NVSS J154952-065907 BLL 15 49 52.0440165168 -06 59 07.919771748   19.8   18.5 18.021 ~ 39 0
51 RX J1748.5+7005 BLL 17 48 32.8402992264 +70 05 50.768819304   17.46 17.01 15.48   ~ 456 2
52 1RXS J180043.6+782806 BLL 18 00 45.6838528560 +78 28 04.018028016   16.4 15.90 16.134   ~ 793 1
53 RX J1841.3+2909 BLL 18 41 21.7201454496 +29 09 41.032048536   17.6   16.7   ~ 42 1
54 RX J1904.2+3627 BLL 19 04 11.8663392936 +36 26 58.921335672           ~ 39 1
55 NVSS J191129-190823 BLL 19 11 29.7453785851 -19 08 24.638682574           ~ 44 1
56 NVSS J192151-160712 BLL 19 21 51.5259505704 -16 07 12.562591584       15.7   ~ 49 1

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