2017ApJ...846...34A

Query : 2017ApJ...846...34A

2017ApJ...846...34A - Astrophys. J., 846, 34-34 (2017/September-1)

The second catalog of flaring gamma-ray sources from the Fermi All-sky Variability Analysis.

ABDOLLAHI S., ACKERMANN M., AJELLO M., ALBERT A., BALDINI L., BALLET J., BARBIELLINI G., BASTIERI D., BECERRA GONZALEZ J., BELLAZZINI R., BISSALDI E., BLANDFORD R.D., BLOOM E.D., BONINO R., BOTTACINI E., BREGEON J., BRUEL P., BUEHLER R., BUSON S., CAMERON R.A., CARAGIULO M., CARAVEO P.A., CAVAZZUTI E., CECCHI C., CHEKHTMAN A., CHEUNG C.C., CHIARO G., CIPRINI S., CONRAD J., COSTANTIN D., COSTANZA F., CUTINI S., D'AMMANDO F., DE PALMA F., DESAI A., DESIANTE R., DIGEL S.W., DI LALLA N., DI MAURO M., DI VENERE L., DONAGGIO B., DRELL P.S., FAVUZZI C., FEGAN S.J., FERRARA E.C., FOCKE W.B., FRANCKOWIAK A., FUKAZAWA Y., FUNK S., FUSCO P., GARGANO F., GASPARRINI D., GIGLIETTO N., GIOMI M., GIORDANO F., GIROLETTI M., GLANZMAN T., GREEN D., GRENIER I.A., GROVE J.E., GUILLEMOT L., GUIRIEC S., HAYS E., HORAN D., JOGLER T., JOHANNESSON G., JOHNSON A.S., KOCEVSKI D., KUSS M., LA MURA G., LARSSON S., LATRONICO L., LI J., LONGO F., LOPARCO F., LOVELLETTE M.N., LUBRANO P., MAGILL J.D., MALDERA S., MANFREDA A., MAYER M., MAZZIOTTA M.N., MICHELSON P.F., MITTHUMSIRI W., MIZUNO T., MONZANI M.E., MORSELLI A., MOSKALENKO I.V., NEGRO M., NUSS E., OHSUGI T., OMODEI N., ORIENTI M., ORLANDO E., PALIYA V.S., PANEQUE D., PERKINS J.S., PERSIC M., PESCE-ROLLINS M., PETROSIAN V., PIRON F., PORTER T.A., PRINCIPE G., RAINO S., RANDO R., RAZZANO M., RAZZAQUE S., REIMER A., REIMER O., SGRO C., SIMONE D., SISKIND E.J., SPADA F., SPANDRE G., SPINELLI P., STAWARZ L., SUSON D.J., TAKAHASHI M., TANAKA K., THAYER J.B., THOMPSON D.J., TORRES D.F., TORRESI E., TOSTI G., TROJA E., VIANELLO G. and WOOD K.S.

Abstract (from CDS):

We present the second catalog of flaring gamma-ray sources (2FAV) detected with the Fermi All-sky Variability Analysis (FAVA), a tool that blindly searches for transients over the entire sky observed by the Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope. With respect to the first FAVA catalog, this catalog benefits from a larger data set, the latest LAT data release (Pass 8), as well as from an improved analysis that includes likelihood techniques for a more precise localization of the transients. Applying this analysis to the first 7.4 years of Fermi observations, and in two separate energy bands 0.1-0.8 GeV and 0.8-300 GeV, a total of 4547 flares were detected with significance greater than 6σ (before trials), on the timescale of one week. Through spatial clustering of these flares, 518 variable gamma-ray sources were identified. Based on positional coincidence, likely counterparts have been found for 441 sources, mostly among the blazar class of active galactic nuclei. For 77 2FAV sources, no likely gamma-ray counterpart has been found. For each source in the catalog, we provide the time, location, and spectrum of each flaring episode. Studying the spectra of the flares, we observe a harder-when-brighter behavior for flares associated with blazars, with the exception of BL Lac flares detected in the low-energy band. The photon indexes of the flares are never significantly smaller than 1.5. For a leptonic model, and under the assumption of isotropy, this limit suggests that the spectrum of freshly accelerated electrons is never harder than p∼2.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): astroparticle physics - catalogs - galaxies: active - gamma rays: general - techniques: photometric - techniques: photometric

VizieR on-line data: <Available at CDS (J/ApJ/846/34): table2.dat table4.dat>

Nomenclature: Table 2: 2FAV JHHMM+DD.d N=518.

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 39

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Number of rows : 39
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 QSO B2358+2056 QSO 00 01 32.3703295704 +21 13 36.275283372     19.10     ~ 27 1
2 QSO J0017-0512 Bla 00 17 35.8173230832 -05 12 41.768611560       17.60   ~ 127 1
3 QSO B0016+73 Bla 00 19 45.78637230 +73 27 30.0176020     19.00 18.26   ~ 313 1
4 3FGL J0026.2-4812 BLL 00 26 14 -48 12.6           ~ 8 0
5 [VV2000] J002945.9+055440 Bla 00 29 45.89631836 +05 54 40.7120179   19.5 15.92 19.50   ~ 74 1
6 ICRF J003031.8-021156 QSO 00 30 31.82374240 -02 11 56.1331670   19.6       ~ 59 1
7 9Y-MST J0031-5521 Bla 00 32 18.7 -55 22 00           ~ 32 0
8 QSO B0056-572 Bla 00 58 46.5813154752 -56 59 11.469154272   17.91   16.95   ~ 98 1
9 QSO B0235+1624 BLL 02 38 38.93010450 +16 36 59.2745528   16.46 15.50 15.92   ~ 1614 2
10 LS I +61 303 HXB 02 40 31.6644419688 +61 13 45.593918580 11.27 11.61 10.75 10.19 9.55 B0Ve 903 2
11 NGC 1275 Bla 03 19 48.1599902040 +41 30 42.108850836   13.10 12.48 11.09   ~ 4243 3
12 6C 032130+340016 BLL 03 24 41.1612813408 +34 10 45.857918460     15.72 13.1   ~ 314 1
13 3C 111 Sy1 04 18 21.2772425736 +38 01 35.801359968   19.75 18.05     ~ 1002 2
14 WISEA J042840.41-375619.3 BLL 04 28 40.4241894720 -37 56 19.580735832   18.96 19.0 17.21   ~ 343 1
15 MCG+01-12-009 Bla 04 33 11.0956735296 +05 21 15.619461552   15.72 15.05 10.08   ~ 2099 2
16 M 1 SNR 05 34 31.8 +22 01 03           ~ 6516 1
17 V* CM Tau Psr 05 34 31.9474694616 +22 00 52.153698024           ~ 5476 0
18 QSO B0537-286 Bla 05 39 54.28147904 -28 39 55.9481236   19.70 20.0 18.789   ~ 314 1
19 V* V959 Mon No* 06 39 38.5992561839 +05 53 52.870895189           ~ 175 0
20 RX J0708.9+2241 BLL 07 08 58.2894477720 +22 41 35.498077728           ~ 52 1
21 QSO J0849+5108 BLL 08 49 57.97685916 +51 08 29.0238146   19.37 18.78 17.79   ~ 270 2
22 0FGL J0910.2-5044 Bz? 09 11 00.2 -50 47 48           ~ 20 0
23 QSO J0948+0022 Bla 09 48 57.32005819 +00 22 25.5596984   18.85 18.61 18.17   ~ 350 2
24 1FGL J1018.6-5856 HXB 10 18 55.5875706288 -58 56 45.975246900   13.638 12.683     O6V((f)) 156 0
25 PSR J1023+0038 Psr 10 23 47.6841824712 +00 38 41.005893516     17.31     GV 470 0
26 CPD-63 2495 HXB 13 02 47.6544015048 -63 50 08.626970292 10.34 10.72 9.98 10.03   O9.5Ve 852 0
27 V* V1369 Cen No* 13 54 45.3506993424 -59 09 04.093260192   15.5   15.1   ~ 96 0
28 V* V1324 Sco No* 17 50 53.9093841216 -32 37 21.090962028           ~ 100 0
29 PSR J1826-1256 Psr 18 26 08.570 -12 56 33.53           ~ 152 1
30 V* V479 Sct HXB 18 26 15.0561548880 -14 50 54.247274304 12.02 12.23 11.27 11.04   ON6V((f))z 613 2
31 V* V5668 Sgr No* 18 36 56.827920 -28 55 39.97524       16.028   ~ 142 0
32 B2 2008+33 Rad 20 10 47 +33 22.1           ~ 3 0
33 PSR J2021+4026 Psr 20 21 30.496 +40 26 53.56           ~ 300 2
34 6C 202345+760123 BLL 20 22 35.5757966424 +76 11 26.171152728     18.10 17.54   ~ 109 1
35 V* V339 Del No* 20 23 30.6873337580 +20 46 03.765339899   17.50 16.86     ~ 225 0
36 V* V1521 Cyg HXB 20 32 25.78 +40 57 27.9           WN4/5-6/7 2035 2
37 EM* AS 453 Sy* 21 02 09.8189024184 +45 46 32.733603228   16.04 14.68 11.38   Mep 337 0
38 NAME BL Lac BLL 22 02 43.2913536816 +42 16 39.979416792   15.66 14.72     ~ 2397 1
39 QSO B2356+196 Bla 23 58 46.0850683944 +19 55 20.303702724     18.0 17.37   ~ 152 1

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