2016A&A...594A..60L

Query : 2016A&A...594A..60L

2016A&A...594A..60L - Astronomy and Astrophysics, volume 594A60-60 (2016/10-1)

VLBA observations of radio faint Fermi-LAT sources above 10 GeV.

LICO R., GIROLETTI M., ORIENTI M. and D'AMMANDO F.

Abstract (from CDS):

Context. The first Fermi-LAT high-energy source catalog (1FHL), containing γ-ray sources detected above 10 GeV, is an ideal sample for characterizing the physical properties of the most extreme γ-ray sources.
Aims. We investigate the pc scale properties of a subsample of radio faint 1FHL sources with the aim of confirming the proposed blazar associations by revealing a compact high brightness temperature radio core, and we propose new low-frequency counterparts for the unassociated γ-ray sources (UGS). Moreover, we increase the number of 1FHL sources with high-resolution observations to explore the possible connection between radio and γ rays at E>10GeV.
Methods. We observed 84 1FHL sources, mostly blazars of high synchrotron peaked (HSP) type, in the northern sky with the Very Long Baseline Array (VLBA) at 5GHz. These sources lack high-resolution radio observations and have at least one NRAO VLA sky survey counterpart within the 95% confidence radius. For those sources without a well-identified radio counterpart we exploit the VLBA multiple phase-center correlation capability to identify the possible low-frequency candidates.
Results. For ∼93% of the sources in our sample we reveal a compact high brightness temperature radio core, which supports their proposed blazar association. The vast majority of the detected sources are radio weak, with a median VLBI flux density value of 16.3mJy. For the detected sources we obtain an average brightness temperature on the order of 2x1010K. We find a compact component for 16 UGS, for which we propose a new low-frequency association.
Conclusions. We find brightness temperature values that do not require high Doppler factors, and are in agreement with the expected values for the equipartition of energy between particles and magnetic field. We find strong indications for the blazar nature of all of the detected UGS, for which we propose new low-frequency associations. The characterization of the physical properties of this emerging population is relevant in view of the construction of the new generation Cherenkov Telescope Array.

Abstract Copyright: © ESO, 2016

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

Simbad objects: 89

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Number of rows : 89
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 2MASS J00075997+4712078 BLL 00 07 59.9724805320 +47 12 07.769093004   18.3   18.2   ~ 71 1
2 NVSS J000922+503028 BLL 00 09 22.7604063473 +50 30 28.834597215           ~ 47 0
3 LEDA 1413300 BLL 00 37 50.8803675096 +12 38 19.876764084 17.59 16.83 16.22 14.7   ~ 49 1
4 RX J0040.2+4049 BLL 00 40 13.8112928443 +40 50 04.756997684     19.30 19.9   ~ 80 1
5 SDSS J004348.84+342626.1 Bla 00 43 48.8431545768 +34 26 26.091802608       19.9   ~ 78 1
6 1FHL J0053.9+4030 gam 00 53 30.90 +40 30 15.3           ~ 2 0
7 2MASX J01032593+5337137 BLL 01 03 25.9580331336 +53 37 13.279637172           ~ 32 0
8 RX J0123.1+3420 BLL 01 23 08.6375580816 +34 20 48.664188060       16.8   ~ 132 1
9 RX J0131.1+6120 BLL 01 31 07.2257589038 +61 20 33.372505609           ~ 54 0
10 RX J0134.4+2638 BLL 01 34 28.1946775464 +26 38 43.010995272   17.1   15.9   ~ 62 1
11 2MASS J01530732+7517429 BLL 01 53 07.3819815144 +75 17 42.924650784     18.90 18.3   ~ 33 0
12 ICRF J021252.8+224452 BLL 02 12 52.8350181888 +22 44 52.258856208       16.7   ~ 66 1
13 RX J0241.3+6543 BLL 02 41 21.7468157232 +65 43 11.576921016           ~ 38 1
14 2FGL J0307.4+4915 BLL 03 07 27.0340717008 +49 15 09.759977496           ~ 39 1
15 RX J0321.9+2336 BLL 03 21 59.9703031416 +23 36 11.206732680     16.80 16.4   ~ 73 1
16 2FGL J0332.1+6309 BLL 03 31 53.9172529368 +63 08 14.168272668           ~ 40 1
17 1RXS J033348.7+291646 BLL 03 33 49.0038844011 +29 16 31.546134301           ~ 48 1
18 6C 032924+652644 BLL 03 33 56.7381995712 +65 36 56.186387964           ~ 66 1
19 RX J0338.4+1302 BLL 03 38 29.2787338512 +13 02 15.445163688   19.3   18.3   ~ 48 1
20 1RXS J042523.0+632016 BLL 04 25 25.3524434183 +63 20 01.675412175           ~ 25 1
21 SNR G150.3+04.5 SNR 04 26.5 +54 38           ~ 49 0
22 1FHL J0432.2+5555 gam 04 32 14 +55 55.7           ~ 3 0
23 NVSS J051547+152716 BLL 05 15 47.3535758902 +15 27 16.593670679       18.1   ~ 44 1
24 1RXS J051631.7+735115 BLL 05 16 31.2308430864 +73 51 08.659789740           ~ 46 1
25 RX J0529.0+0934 Bla 05 29 02.5592886264 +09 34 35.472310320           ~ 37 0
26 1RXS J054030.8+582339 BLL 05 40 30.0094967101 +58 23 38.459367179       16.065   ~ 51 1
27 B2 0557+38 BLL 06 01 02.8707695475 +38 38 29.169121958           ~ 50 1
28 CLASS J060458.4179+000043.362 BLL 06 04 58.4179 +00 00 43.362           ~ 33 1
29 NVSS J060501+272456 Rad 06 05 01.05 +27 24 56.3           ~ 1 0
30 1FHL J0605.4+2726 gam 06 05 25 +27 26.6           ~ 2 0
31 NVSS J060723+473947 BLL 06 07 23.2550008416 +47 39 46.944292500       16.38   ~ 91 1
32 1FGL J0625.7+0001 gam 06 25 44 +00 01.8           ~ 7 0
33 NVSS J064435+603849 BLL 06 44 35.7455444017 +60 38 51.161716281           ~ 47 1
34 RX J0648.7+1516 BLL 06 48 47.6488006968 +15 16 24.797585352       16.2   ~ 99 1
35 1RXS J065033.9+205603 BLL 06 50 35.3520080787 +20 55 57.363171447           ~ 23 0
36 RX J0706.5+3744 BLL 07 06 31.6968725328 +37 44 36.410415576           ~ 49 1
37 6C 073840+545153 BLL 07 42 39.79069953 +54 44 24.6671050     16.90     ~ 138 1
38 QSO B0737+744 BLL 07 44 05.3750968872 +74 33 58.256429832     16.89 16.6   ~ 144 0
39 1RXS J074707.6+851211 BLL 07 47 16.1527432872 +85 12 08.624543324           ~ 38 0
40 BWE 0826+0908 Bla 08 29 30.3184983324 +08 58 21.292947420     21.5     ~ 47 1
41 ATO J132.5014+48.9163 Bla 08 50 00.3513461725 +48 54 58.673579470       18.3   ~ 45 1
42 2FGL J0912.5+2758 BLL 09 12 11.2102430208 +27 59 27.880270260   19.38 18.91 19.1   ~ 47 0
43 6C 091657+862551 BLL 09 29 43.0540990776 +86 12 21.278588760     19.4 18.55   ~ 85 1
44 RX J0946.3+0104 BLL 09 46 20.2166039496 +01 04 52.099953780   20.92 20.17 19.6   ~ 67 1
45 6C 095456+654857 BLL 09 58 47.2451872176 +65 33 54.819354600     17.0 15.75   ~ 771 1
46 RX J1023.6+3001 BLL 10 23 39.7366248552 +30 00 57.751171200   19.31 18.77 18.2   ~ 58 0
47 RX J1100.3+4019 BLL 11 00 21.0622217352 +40 19 28.049163780   17.67 17.27 17.8   ~ 67 0
48 2MASS J11073589+0222250 BLL 11 07 35.9156720520 +02 22 24.595003416 18.41 18.51 18.26 18.6   ~ 49 0
49 2MASS J11311861+5808587 BLL 11 31 18.6289495896 +58 08 58.792686432   17.47 16.89 16.7   ~ 61 1
50 HS 1133+6753 BLL 11 36 30.0868711488 +67 37 04.345988232   18.19 17.45 15.3   ~ 161 1
51 2MASX J11365007+2550521 BLL 11 36 50.1276014544 +25 50 52.392075792     17.48 15.7   ~ 65 0
52 RX J1211.9+2242 BLL 12 11 58.6306591752 +22 42 32.946579432   19.13 18.66 18.7   ~ 51 0
53 NVSS J121238+231110 Rad 12 12 38.560 +23 11 10.74           ~ 1 0
54 2FGL J1223.3+7954 BLL 12 23 58.0745637024 +79 53 28.216428900           ~ 40 1
55 RX J1224.4+2436 BLL 12 24 24.1862962656 +24 36 23.499792828   17.93 17.37     ~ 162 1
56 [VV2006] J124510.0+570954 BLL 12 45 09.9995503080 +57 09 54.373550040   18.33 17.96     ~ 72 1
57 2FGL J1249.9+3705 BLL 12 49 46.7512275600 +37 07 47.911860480       18.9   ~ 45 0
58 LBQS 1308+0051 BLL 13 11 06.4762326096 +00 35 10.045283820   18.53 18.01     ~ 60 0
59 7C 1312+2404 BLL 13 14 43.8062104200 +23 48 26.782554060 17.15 16.83 16.57 15.4   ~ 99 2
60 87GB 132042.1+295714 BLL 13 23 02.587 +29 41 33.36   20.7       ~ 68 1
61 RX J1406.9+1642 BLL 14 06 59.1885066864 +16 42 07.836157008   18.63 18.26 18.5   ~ 42 0
62 RX J1417.9+2543 BLL 14 17 56.6706279264 +25 43 26.244368868   18.00 17.2 14.6   ~ 190 1
63 RX J1419.0+7732 BLL 14 19 00.3556447992 +77 32 29.346440708           ~ 49 1
64 2FGL J1548.3+1453 BLL 15 48 24.3869221704 +14 57 02.716215588           ~ 41 1
65 9Y-MST J1619+7535 BLL 16 19 03.4 +75 36 35           ~ 22 0
66 NVSS J161913+753753 Rad 16 19 13.73 +75 37 52.0           ~ 3 1
67 ATO J247.6797+52.3607 BLL 16 30 43.1466624264 +52 21 38.623784940       17.8   ~ 52 1
68 1RXS J173605.4+203236 BLL 17 36 05.2614569640 +20 33 01.190582892   18.8   18.6   ~ 43 0
69 1RXS J174357.3+193505 BLL 17 43 57.8330083440 +19 35 09.018846384     16.80 12.7   ~ 190 1
70 RX J1809.4+2041 BLL 18 09 25.4519567448 +20 41 30.904155564           ~ 47 0
71 RX J1841.3+2909 BLL 18 41 21.7201454496 +29 09 41.032048536   17.6   16.7   ~ 42 1
72 RX J1841.7+3218 BLL 18 41 47.0421791016 +32 18 39.144474684           ~ 54 0
73 W 49b SNR 19 11 09.5 +09 06 21           ~ 500 1
74 87GB 192614.4+614823 BLL 19 26 49.8911645880 +61 54 42.345978048           ~ 54 1
75 1RXS J194246.3+103339 BLL 19 42 47.4841298280 +10 33 27.102911688           ~ 63 1
76 1RXS J200245.4+630226 BLL 20 02 45.3460785336 +63 02 33.120412620   21.6   20.7   ~ 37 0
77 NVSS J200506+700440 BLL 20 05 06.0139547561 +70 04 39.353183462           ~ 42 1
78 QSO J2015+371 BLL 20 15 28.72978661 +37 10 59.5147372     21.82 21.4   ~ 324 2
79 VER J2016+372 gam 20 16 04.0 +37 13 33           ~ 11 0
80 RX J2030.8+1935 BLL 20 30 57.1340134032 +19 36 12.930528420           ~ 59 2
81 1RXS J212741.4+361310 BLL 21 27 43.0283820507 +36 13 05.734648328           ~ 46 1
82 NAME BL Lac BLL 22 02 43.2913536816 +42 16 39.979416792   15.66 14.72     ~ 2397 1
83 ICRF J221239.1+275938 BLL 22 12 39.10311392 +27 59 38.4496223           ~ 55 1
84 SDSS J222329.57+010226.6 BLL 22 23 29.5712726232 +01 02 26.654394588           ~ 46 0
85 RX J2247.8+4413 BLL 22 47 53.2057635432 +44 13 15.393598068           ~ 52 1
86 ICRF J230734.0+145017 BLL 23 07 34.00170520 +14 50 17.9750323   20.51 19.68 19.39   ~ 73 1
87 RX J2313.9+1444 BLL 23 13 57.3374119560 +14 44 23.232581304 18.55 18.21 17.14     ~ 66 1
88 2MASS J23291427+3754146 Bla 23 29 14.2674395856 +37 54 14.484094488           ~ 50 1
89 ICRF J234639.9+070506 BLL 23 46 39.9335867472 +07 05 06.855326664   17.0 16.5     ~ 69 1

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