2016ApJ...831..113A

Query : 2016ApJ...831..113A

2016ApJ...831..113A - Astrophys. J., 831, 113-113 (2016/November-1)

Very high energy observations of the binaries V 404 Cyg and 4U 0115+634 during giant X-ray outbursts.

ARCHER A., BENBOW W., BIRD R., BOURBEAU E., BUCHOVECKY M., BUCKLEY J.H., BUGAEV V., BYRUM K., CERRUTI M., CONNOLLY M.P., CUI W., ERRANDO M., FALCONE A., FENG Q., FERNANDEZ-ALONSO M., FINLEY J.P., FLEISCHHACK H., FLINDERS A., FORTSON L., FURNISS A., GRIFFIN S., GRUBE J., HUTTEN M., HANNA D., HERVET O., HOLDER J., HUMENSKY T.B., JOHNSON C.A., KAARET P., KAR P., KELLEY-HOSKINS N., KERTZMAN M., KIEDA D., KRAUSE M., KUMAR S., LANG M.J., LIN T.T.Y., MAIER G., MORIARTY P., MUKHERJEE R., NIETO D., O'BRIEN S., ONG R.A., PARK N., POHL M., POPKOW A., PUESCHEL E., QUINN J., RAGAN K., REYNOLDS P.T., RICHARDS G.T., ROACHE E., ROUSSELLE J., ROVERO A.C., SADEH I., SCHLENSTEDT S., SEMBROSKI G.H., SHAHINYAN K., STASZAK D., TELEZHINSKY I., TYLER J., WAKELY S.P., WILCOX P., WILHELM A. and WILLIAMS D.A.

Abstract (from CDS):

Transient X-ray binaries produce major outbursts in which the X-ray flux can increase over the quiescent level by factors as large as 107. The low-mass X-ray binary V 404 Cyg and the high-mass system 4U 0115+634 underwent such major outbursts in 2015 June and October, respectively. We present here observations at energies above hundreds of GeV with the VERITAS observatory taken during some of the brightest X-ray activity ever observed from these systems. No gamma-ray emission has been detected by VERITAS in 2.5 hr of observations of the microquasar V 404 Cyg from 2015, June 20-21. The upper flux limits derived from these observations on the gamma-ray flux above 200 GeV of F < 4.4×10–12 cm–2 s–1 correspond to a tiny fraction (about 10–6) of the Eddington luminosity of the system, in stark contrast to that seen in the X-ray band. No gamma-rays have been detected during observations of 4U 0115+634 in the period of major X-ray activity in 2015 October. The flux upper limit derived from our observations is F < 2.1×10–12 cm–2 s–1 for gamma-rays above 300 GeV, setting an upper limit on the ratio of gamma-ray to X-ray luminosity of less than 4%.

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

Journal keyword(s): acceleration of particles - binaries: general - gamma rays: general - stars: individual: (V 404 Cyg, 4U 0115+634) - stars: individual: V 404 Cyg, 4U 0115+634

Simbad objects: 11

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Number of rows : 11
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 V* V635 Cas HXB 01 18 31.9704955824 +63 44 33.072603144 17.05 16.64 15.19 14.34 13.22 B0.2Ve 791 0
2 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
3 M 1 SNR 05 34 31.8 +22 01 03           ~ 6516 1
4 HD 245770 HXB 05 38 54.5748918624 +26 18 56.836952784 9.30 9.84 9.39 8.77 8.30 O9/B0III/Ve 1045 0
5 HD 259440 HXB 06 32 59.2566076656 +05 48 01.160755848 9.17 9.63 9.15     B0pe 256 0
6 1FGL J1018.6-5856 HXB 10 18 55.5875706288 -58 56 45.975246900   13.638 12.683     O6V((f)) 156 0
7 CPD-63 2495 HXB 13 02 47.6544015048 -63 50 08.626970292 10.34 10.72 9.98 10.03   O9.5Ve 852 0
8 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
9 Granat 1915+105 HXB 19 15 11.55576 +10 56 44.9052           ~ 2810 0
10 HD 226868 HXB 19 58 21.6757355952 +35 12 05.784512688 9.38 9.72 8.91 8.42   O9.7Iabpvar 4590 0
11 V* V404 Cyg HXB 20 24 03.8247037434 +33 52 01.961154861           G9/K0III/V 1370 0

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