2017A&A...598A.134A

Query : 2017A&A...598A.134A

2017A&A...598A.134A - Astronomy and Astrophysics, volume 598A134-134 (2017/2-1)

Searching for γ-ray signature in WHSP blazars. Fermi-LAT detection of 150 excess signal in the 0.3-500 GeV band.

ARSIOLI B. and CHANG Y.-L.

Abstract (from CDS):

Aims. A direct search of γ-ray emission centered on multifrequency selected candidates is a valuable complementary approach to the standard search adopted in current γ-ray Fermi-LAT catalogs. Our sources are part of the 2WHSP sample that was assembled with the aim of providing targets for Imaging Atmospheric Cherenkov Telescopes (IACT). A likelihood analysis based on their known position enabled us to detect 150 γ-ray excess signals that have not yet been reported in previous γ-ray catalogs (1FGL, 2FGL, 3FGL). By identifying new sources, we solve a fraction of the extragalactic isotropic γ-ray background (IGRB) composition, improving the description of the γ-ray sky.
Methods. We perform data reduction with the Fermi Science Tools using positions from 400 high synchrotron peaked (HSP) blazars as seeds of tentative γ-ray sources; none of them have counterparts from previous 1FGL, 2FGL and 3FGL catalogs. Our candidates are part of the 2WHSP sample (currently the largest set of HSP blazars). We focus on HSPs characterized by bright synchrotron component with peak flux νf(ν)≥10–12.1erg/cm2/s, testing the hypothesis of having a γ-ray source in correspondence to the WHSP positions. Our likelihood analysis considers the 0.3-500GeV energy band, integrating over 7.2yr of Fermi-LAT observation and making use of the Pass 8 data release.
Results. From the 400 candidates tested, a total of 150 2WHSPs showed excess γ-ray signature: 85 high-significance detections with test statistic (TS)>25, and 65 lower-significance detections with TS between 10 to 25. We assume a power law spectrum in the 0.3-500GeV band and list the spectrum parameters describing all 150 new γ-ray sources. We study the γ-ray photon spectral index distribution, the likelihood of detection according to the synchrotron peak brightness (figure of merit parameter), and plot the measured γ-ray LogN-LogS of HSP blazars, also discussing the portion of the IGRB that has been resolved by the present work. We also report on four cases where we could resolve source confusion and find counterparts for unassociated 3FGL sources with the help of high-energy TS maps together with multifrequency data. The 150 new γ-ray sources are named with the acronym 1BIGB for the first version of the Brazil ICRANet Gamma-ray Blazar catalog, in reference to the cooperation agreement supporting this work.

Abstract Copyright: © ESO, 2017

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

VizieR on-line data: <Available at CDS (J/A+A/598/A134): tablea1.dat tablea2.dat>

Nomenclature: Table A.1: 1BIGB JHHMMSS.s+DDMMSS N=150.

Simbad objects: 156

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Number of rows : 156
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 J000950.7-431653 BLL 00 09 49.7930379976 -43 16 50.300680049           ~ 18 0
2 RX J0013.4+0949 Bla 00 13 28.8112523395 +09 49 30.627724243           ~ 17 0
3 1RXS J001528.3+353641 BLL 00 15 27.9464473488 +35 36 39.033974304       18.5   ~ 22 0
4 2MASS J00292862+2053339 Bla 00 29 28.6066603763 +20 53 33.900675689           ~ 19 0
5 2MASX J00414706-4701364 BLL 00 41 47.0180375376 -47 01 36.915505968           ~ 17 0
6 RX J0058.2+1723 BLL 00 58 16.7805708888 +17 23 13.315476408       18.9   ~ 25 0
7 PMN J0102-2001 Bla 01 02 50.9622625673 -20 01 58.330689204           ~ 27 1
8 1RXS J011501.3-340008 BLL 01 15 01.6479182544 -34 00 27.119000088       19.1   ~ 31 0
9 1RXS J012657.1+330730 BLL 01 26 57.2379078072 +33 07 30.315326268     17.70 18.7   ~ 30 0
10 1RXS J014040.9-075850 BLL 01 40 40.8911639232 -07 58 48.990888084       18.5   ~ 32 0
11 RX J0201.1+0034 BLL 02 01 06.1794930072 +00 34 00.135789564   18.99 18.42 18   ~ 113 0
12 1RXS J020413.6-333345 BLL 02 04 12.9304093536 -33 33 41.065719768       19   ~ 26 0
13 1RXS J021206.0-255808 Bla 02 12 05.7611260363 -25 57 58.383836515           ~ 20 0
14 RX J0212.3-0222 Bla 02 12 16.8834524928 -02 21 55.817658756           ~ 22 0
15 RX J0216.5+2314 BLL 02 16 32.0944044336 +23 14 50.353758528       18.4   ~ 36 0
16 PMN J0220-0842 BLL 02 20 48.4684528704 -08 42 50.421209760   18.98 18.43 18.16   ~ 40 1
17 1RXS J023341.7+065545 BLL 02 33 40.9956447624 +06 56 11.057403995           ~ 24 1
18 1RXS J023428.6+804341 Bla 02 34 30.6135943747 +80 43 37.273811400           ~ 19 0
19 1RXS J030103.8+344109 BLL 03 01 03.7549027896 +34 41 01.078942128     18.53     ~ 63 0
20 RX J0303.5+0554 BLL 03 03 30.2006232720 +05 54 30.192130080       16.3   ~ 34 1
21 RX J0304.5-0054 BLL 03 04 33.9589424424 -00 54 04.710232836   19.58 18.96 18.3   ~ 46 1
22 NVSS J030544+403507 Bla 03 05 44.2764896903 +40 35 09.001367593           ~ 4 0
23 1RXS J031104.2-440245 Bla 03 11 03.2767630622 -44 02 28.079213498           ~ 17 0
24 RX J0314.3+0620 BLL 03 14 23.9279493480 +06 19 56.525566764       17.5   ~ 45 1
25 SUMSS J032009-704535 Bla 03 20 09.1494438712 -70 45 34.088709359           ~ 19 0
26 1RXS J032037.9+112503 Bla 03 20 38.0432654659 +11 24 52.378015387           ~ 11 0
27 RX J0320.9+0424 Bla 03 20 56.3843333868 +04 24 48.527778851           ~ 6 0
28 1RXS J032646.8-340426 Bla 03 26 47.3535051072 -34 04 47.871718441           ~ 14 0
29 1RXS J032852.3-571552 Bla 03 28 52.6943657536 -57 16 04.282603463           ~ 18 0
30 1RXS J033623.3-034727 BLL 03 36 23.8026141624 -03 47 38.594258592   18.53   16.91   ~ 38 0
31 1RXS J033832.0-570449 Bla 03 38 32.0211485752 -57 04 48.627098430           ~ 23 0
32 1RXS J035855.6-305437 BLL 03 58 56.1047599056 -30 54 47.886192072           ~ 28 0
33 1RXS J041112.1-394131 BLL 04 11 12.3746456904 -39 41 43.635220980       19.5   ~ 17 0
34 1RXS J041237.3-392612 Bla 04 12 38.5004715236 -39 26 29.828757680           ~ 8 0
35 1RXS J042218.2+195047 BLL 04 22 18.3397702069 +19 50 54.920278805           ~ 90 0
36 1RXS J042900.5-323633 BLL 04 29 00.1791493200 -32 36 41.096135520     19.00 18.3   ~ 23 0
37 2MASS J04351777-2621221 Bla 04 35 17.7694763198 -26 21 22.425376936           ~ 20 0
38 1RXS J044127.8+150455 BLL 04 41 27.4667781960 +15 04 55.600800780       18.4   ~ 29 0
39 RX J0442.6+6140 Bla 04 42 40.6481398176 +61 40 39.421467192           ~ 26 1
40 1RXS J044328.4-415151 Bla 04 43 28.4137707681 -41 51 56.145891728           ~ 16 0
41 1RXS J050335.6-111504 BLL 05 03 35.4199786056 -11 15 06.738530040       19.9   ~ 27 0
42 1RXS J050419.3-095622 Bla 05 04 19.5123668707 -09 56 32.776224526           ~ 10 0
43 1RXS J050559.9-382059 Bla 05 06 01.6713583416 -38 20 55.665751596   17.87   16.36   ~ 18 0
44 1RXS J050727.6-334628 Bla 05 07 27.2773004835 -33 46 35.494784369           ~ 25 1
45 1RXS J053627.6-254738 Bla 05 36 26.8812205557 -25 47 48.238716726           ~ 15 0
46 1RXS J053629.4-334302 BLL 05 36 29.0674147920 -33 43 02.465333796 17.11 16.97 16.93 16.8   ~ 58 1
47 2MASS J05364535-2558411 Bla 05 36 45.3520133046 -25 58 41.640205020           ~ 4 0
48 1RXS J055717.0-061705 Bla 05 57 16.8396368306 -06 17 06.828429628           ~ 22 0
49 2MASS J06071437-2518593 BLL 06 07 14.3762931000 -25 18 59.352566472       17.7   ~ 26 0
50 1RXS J062150.0-341140 BLL 06 21 49.7056934664 -34 11 49.346560176       20.2   ~ 26 0
51 2MASS J06262650-1710467 Bla 06 26 26.50968 -17 10 46.7292           ~ 12 0
52 NVSS J063014-201243 Bla 06 30 15.0688780825 -20 12 36.349514462           ~ 6 0
53 1RXS J065933.5-674356 Bla 06 59 32.9127355352 -67 43 50.253384060           ~ 18 0
54 1RXS J071745.4-552024 Bla 07 17 45.0655444478 -55 20 21.930362362           ~ 17 0
55 RX J0731.8+2804 BLL 07 31 52.7289827136 +28 04 32.936159892       16.2   ~ 44 1
56 RX J0733.4+3515 BLL 07 33 29.5804182336 +35 15 42.720710040     17.90 16.4   ~ 26 1
57 1RXS J075936.1+132123 Bla 07 59 36.1360145184 +13 21 17.841223152           ~ 22 0
58 1RXS J080017.3+561116 Bla 08 00 15.5266711955 +56 11 07.327957662           ~ 17 0
59 RX J0801.5+4638 Bla 08 01 36.0239832817 +46 38 24.872258890           ~ 6 0
60 1RXS J082904.5+175415 BLL 08 29 04.8275335680 +17 54 15.865834356           ~ 63 1
61 SDSS J083724.71+145819.8 BLL 08 37 24.7133427936 +14 58 19.762029480       14.7   ~ 41 1
62 PMN J0857+0135 BLL 08 57 49.8048492216 +01 35 30.318573336   18.76 18.12 15.7   ~ 41 1
63 PMN J0908-1000 BLL 09 08 02.2023627168 -09 59 37.432877532   15.0   14.40   ~ 47 1
64 RX J0909.8+3105 BLL 09 09 53.2839851256 +31 06 03.167783208   18.74 17.98     ~ 61 0
65 1RXS J091324.6+813318 BLL 09 13 22.1756779473 +81 33 05.743227952           ~ 27 1
66 RX J0916.8+5238 BLL 09 16 51.9350409624 +52 38 28.331223072   19.02 18.10 15   ~ 82 1
67 2MASS J09323935+1042352 BLL 09 32 39.3632208192 +10 42 35.178509520   19.41 18.63 17.6   ~ 31 0
68 1RXS J093430.2-172117 BLL 09 34 30.1620445536 -17 21 21.470293944   20.32 18.10 18.95   ~ 35 0
69 2MASS J09351480-1736587 BLL 09 35 14.7834135328 -17 36 58.645047977           ~ 26 1
70 RX J0952.4+7502 BLL 09 52 24.2117512536 +75 02 13.168604688     19.90 15.6   ~ 37 0
71 RX J0955.1+3550 BLL 09 55 07.8818398488 +35 51 00.885435048   21.04 20.36 19.1   ~ 68 0
72 1RXS J095627.2-095720 Bla 09 56 28.2142037784 -09 57 19.191491424   17       ~ 28 1
73 2MASS J09584986+7039591 Bla 09 58 49.8028187066 +70 39 59.357951042           ~ 17 1
74 NVSS J102100+162553 BLL 10 21 00.3533388672 +16 25 54.017072220       18.4   ~ 23 0
75 RX J1043.0+0054 Bla 10 43 03.8426985192 +00 54 20.420781192           ~ 41 1
76 RX J1048.9+5010 BLL 10 48 57.6133743624 +50 09 45.261947376   20.78 19.84 18.5   ~ 33 0
77 RX J1055.5-0126 BLL 10 55 34.3694040000 -01 26 16.303689636   18.86 18.54 18.8   ~ 40 0
78 Z 184-50 BLL 11 04 27.3140835504 +38 12 31.798495872   13.50 12.90 8.31   ~ 2841 1
79 RX J1117.2+0006 BLL 11 17 17.5367065392 +00 06 33.637657068   20.00 19.38 19.2   ~ 23 0
80 2MASS J11231805-3232181 Bla 11 23 18.0683979288 -32 32 18.471443784           ~ 18 0
81 1RXS J112612.5-203724 Bla 11 26 11.9865302457 -20 37 25.042281240           ~ 8 0
82 1RXS J113046.7-313801 Bla 11 30 46.1356290456 -31 38 07.564644924   18.42   16.84 16.423 ~ 26 0
83 2MASS J11310528-0944066 Bla 11 31 05.2461123804 -09 44 06.491597876           ~ 22 0
84 1RXS J113443.6-172853 BLL 11 34 44.6993489376 -17 29 01.733715888       19.2   ~ 25 0
85 2MASS J11375560-1710421 BLL 11 37 55.6036520688 -17 10 42.048213312   19.0   18.8   ~ 34 0
86 RX J1211.9+2242 BLL 12 11 58.6306591752 +22 42 32.946579432   19.13 18.66 18.7   ~ 51 0
87 PMN J1215+0732 BLL 12 15 10.9765816512 +07 32 04.676330688     16.0 14.8   ~ 114 1
88 1RXS J121603.6-024302 BLL 12 16 03.2612664000 -02 43 04.698161688   17.73 17.26 17.45   ~ 27 0
89 RX J1241.6+3440 BLL 12 41 41.3827131720 +34 40 31.005349824   20.21 19.70 19.4   DC 35 0
90 RX J1250.2+3156 BLL 12 50 15.5272824960 +31 55 59.590861716   19.31 18.95 19.7   ~ 23 0
91 PMN J1253-3932 BLL 12 53 41.2576033944 -39 31 59.450276892   18.73   17.18   ~ 35 1
92 2MASS J12584805-0447450 BLL 12 58 48.0460059168 -04 47 45.263736096     20.40 18.9   ~ 38 0
93 RX J1301.7+4056 BLL 13 01 45.6483002736 +40 56 24.643449456     18.21     ~ 44 0
94 1RXS J130713.6-034422 Bla 13 07 13.3863492872 -03 44 31.155971290           ~ 4 0
95 1RXS J132542.1-022800 BLL 13 25 41.9201565624 -02 28 10.112982312   20.47 20.00 19.6   ~ 26 0
96 NVSS J132617+123006 BLL 13 26 17.7036437760 +12 29 58.736692644   19.51 18.63 16.6   ~ 50 0
97 RX J1328.5+1145 BLL 13 28 33.5701523640 +11 45 20.523468276   19.71 19.20 19.4   ~ 22 0
98 RX J1336.1+2320 BLL 13 36 12.1589772816 +23 19 58.041745932       18.2   ~ 35 0
99 RX J1353.4+5601 BLL 13 53 28.0474623240 +56 00 56.986350984   19.31 18.92 16.4   ~ 43 0
100 1RXS J140630.3-393508 BLL 14 06 30.0654065496 -39 35 09.209934852       19.7   ~ 26 0
101 PMN J1433-7305 Bla 14 33 42.7990720728 -73 04 37.499573748           ~ 18 1
102 RX J1438.4+1204 BLL 14 38 25.5594682461 +12 04 19.010317429   19.3   17.8   ~ 25 1
103 PMN J1442-4623 Bla 14 42 36.3752500224 -46 23 01.796065116   18.37   16.63   ~ 25 1
104 FIRST J145508.2+192015 Bla 14 55 08.2245134472 +19 20 15.391495428           ~ 10 0
105 1RXS J145550.5-760113 Bla 14 55 43.5500492991 -76 00 52.748302749           ~ 20 0
106 RX J1456.0+5048 BLL 14 56 03.6389208720 +50 48 25.975448676   19.84 19.51 18.1   ~ 41 0
107 1RXS J150636.4-054011 BLL 15 06 37.1078795520 -05 40 04.824178464     20.0 19.1   ~ 24 0
108 RX J1510.6+3335 BLL 15 10 41.1182766024 +33 35 04.705463004   18.6 17.70 15.1   ~ 39 0
109 1RXS J151136.7-165343 Bla 15 11 36.8980510014 -16 53 26.776119692           ~ 6 0
110 2MASS J15161873-1523439 BLL 15 16 18.7342833936 -15 23 44.076511464     19.6 18.5   ~ 22 0
111 RX J1518.4+0752 Bla 15 18 26.6879544120 +07 52 22.355054220           ~ 18 0
112 PMN J1518+0613 Bla 15 18 45.7276771080 +06 13 56.112249504   16.65   15.37   ~ 66 1
113 1RXS J152646.9-153023 Bla 15 26 46.6819229508 -15 30 26.502527148           ~ 19 1
114 RX J1529.2+3812 BLL 15 29 13.5612494904 +38 12 17.489639232   19.05 18.77     ~ 33 1
115 1RXS J154203.2-291516 Bla 15 42 03.0838729272 -29 15 08.999709228           ~ 29 0
116 1RXS J154626.1-285718 Bla 15 46 24.9050378952 -28 57 23.537121208           ~ 6 0
117 1RXS J155053.0-082258 Bla 15 50 53.2722903907 -08 22 46.815591383           ~ 19 0
118 NVSS J155432-121322 Bla 15 54 32.5971424603 -12 13 25.283970061           ~ 17 0
119 RX J1602.2+3050 BLL 16 02 18.0690481440 +30 51 09.537519708   18.56 18.10     ~ 45 1
120 RX J1605.3+5421 BLL 16 05 19.0570123248 +54 20 59.952793272 19.39 19.80 19.08 18.9   ~ 50 1
121 RX J1606.3+1345 BLL 16 06 18.3886360920 +13 45 32.825507328           ~ 21 1
122 NVSS J161327-190835 Bla 16 13 27.1732525522 -19 08 36.450968205           ~ 16 1
123 1RXS J162115.1-003138 BLL 16 21 15.2141650272 -00 31 40.392663276   19.78 19.18 19.4   ~ 21 0
124 RX J1623.5+0857 Bla 16 23 30.5619562143 +08 57 24.529776908           ~ 19 0
125 RX J1626.7+6300 BLL 16 26 46.0616040480 +63 00 48.406573944   19.4       ~ 18 0
126 RX J1642.3+2211 BLL 16 42 20.3168665176 +22 11 43.397477484   19.37 18.86     ~ 30 0
127 RX J1644.3+4546 BLL 16 44 19.9733510880 +45 46 44.350987764   19.44 18.50 15.2   ~ 70 1
128 1RXS J165517.7-224043 Bla 16 55 17.9509878680 -22 40 45.330996579           ~ 8 1
129 1RXS J171108.2+024406 Bla 17 11 08.7216277599 +02 44 04.711418960           ~ 8 0
130 1RXS J174420.1+185215 Bla 17 44 19.8105648566 +18 52 17.978441224           ~ 15 0
131 RX J1747.0+4938 BLL 17 47 02.4777986448 +49 38 01.630465440       19.3   ~ 26 0
132 PMN J1838-6000 BLL 18 38 06.7601933595 -60 00 32.009060520           ~ 28 1
133 1RXS J184822.6+653700 BLL 18 48 22.4966893920 +65 36 57.823557264       18.6   ~ 31 0
134 1RXS J185024.6+263159 Bla 18 50 24.0290262072 +26 31 53.688230364           ~ 21 0
135 NVSS J185813+432452 BLL 18 58 13.4396542320 +43 24 52.205966964           ~ 22 1
136 1RXS J193412.6-241923 Bla 19 34 12.7586079808 -24 19 20.301721407           ~ 24 0
137 1RXS J194356.1+211731 Bla 19 43 56.24400 +21 18 23.3784           ~ 99 1
138 QSO B1959+650 BLL 19 59 59.8520303688 +65 08 54.652536492     12.8 11.21   ~ 699 2
139 1RXS J200205.7-573644 Bla 20 02 04.2010217585 -57 36 45.548341543           ~ 21 0
140 1RXS J201203.7-771214 Bla 20 12 01.3764279493 -77 12 19.664129893           ~ 4 0
141 1RXS J205242.6+081039 BLL 20 52 42.6125135040 +08 10 40.625854752       18.9   ~ 26 0
142 ICRF J214533.3-043439 BLL 21 45 33.3884339088 -04 34 39.180363636   16.22 16.20 14.89   ~ 29 1
143 NVSS J215214-120541 BLL 21 52 14.1160934856 -12 05 41.497924704     18.90 18.6   ~ 26 1
144 1RXS J220108.9-590651 Bla 22 01 07.3359387508 -59 06 40.712669254           ~ 14 0
145 1RXS J220156.0-170656 BLL 22 01 55.8314504520 -17 07 00.517947276   18.42   16.89   ~ 25 0
146 1RXS J221029.2+362159 Bla 22 10 29.6558429214 +36 22 00.008480813           ~ 9 1
147 RX J2211.1-0003 BLL 22 11 08.3443664328 -00 03 02.503763640   19.63 19.00 17.3   ~ 47 0
148 RX J2233.0+1335 BLL 22 33 01.1160978528 +13 36 01.994608836   19.66 18.88 17.6   ~ 41 1
149 NVSS J223626+370713 BLL 22 36 26.3408589408 +37 07 13.494663588           ~ 23 1
150 1RXS J224911.1-130005 BLL 22 49 10.7315054688 -13 00 03.068180892       18.2   ~ 35 0
151 1RXS J225146.9-320614 BLL 22 51 47.5594856352 -32 06 12.723850044     20.00 18.7   ~ 46 0
152 2MASS J22561332-3303386 BLL 22 56 13.3204162224 -33 03 38.527749144     17.20     ~ 21 0
153 1RXS J230636.0-110350 BLL 23 06 34.9995759288 -11 03 48.248438076     19.30 20   ~ 23 0
154 1RXS J232040.1-630925 Bla 23 20 39.8391026612 -63 09 18.241448653           ~ 14 0
155 1RXS J233112.6-030149 Bla 23 31 12.9752010574 -03 01 30.690807764           ~ 16 0
156 1RXS J235321.1-145902 BLL 23 53 21.1238293008 -14 58 57.523564092     19.70 19.5   ~ 22 0

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