VERY HIGH ENERGY OBSERVATIONS OF THE BINARIES V 404 CYG AND 4U 0115+634 DURING GIANT X-RAY OUTBURSTS

被引：2

作者：

Archer, A. ^{[1
]}

Benbow, W. ^{[2
]}

Bird, R. ^{[3
]}

Bourbeau, E. ^{[4
]}

Buchovecky, M. ^{[5
]}

Buckley, J. H. ^{[1
]}

Bugaev, V. ^{[1
]}

Byrum, K. ^{[6
]}

Cerruti, M. ^{[2
]}

Connolly, M. P. ^{[7
]}

Cui, W. ^{[8
,9
,10
]}

Errando, M. ^{[1
]}

Falcone, A. ^{[11
]}

Feng, Q. ^{[8
]}

Fernandez-Alonso, M. ^{[12
]}

Finley, J. P. ^{[8
]}

Fleischhack, H. ^{[13
]}

Flinders, A. ^{[14
]}

Fortson, L. ^{[15
]}

Furniss, A. ^{[16
]}

Griffin, S. ^{[4
]}

Grube, J. ^{[17
]}

Hutten, M.

Hanna, D. ^{[4
]}

Hervet, O. ^{[18
,19
]}

Holder, J. ^{[20
,21
]}

Humensky, T. B. ^{[22
]}

Johnson, C. A. ^{[18
,19
]}

Kaaret, P. ^{[23
]}

Kar, P. ^{[14
]}

Kelley-Hoskins, N. ^{[13
]}

Kertzman, M. ^{[24
]}

Kieda, D. ^{[14
]}

Krause, M. ^{[13
]}

Kumar, S. ^{[20
,21
]}

Lang, M. J. ^{[7
]}

Lin, T. T. Y. ^{[4
]}

Maier, G. ^{[13
]}

Moriarty, P. ^{[7
]}

Mukherjee, R. ^{[25
]}

Nieto, D. ^{[22
]}

O'Brien, S. ^{[3
]}

Ong, R. A. ^{[5
]}

Park, N. ^{[26
]}

Pohl, M. ^{[13
,27
]}

Popkow, A. ^{[5
]}

Pueschel, E. ^{[3
]}

Quinn, J. ^{[3
]}

Ragan, K. ^{[4
]}

Reynolds, P. T. ^{[28
]}

机构：

[1] Washington Univ, Dept Phys, St Louis, MO 63130 USA

[2] Harvard Smithsonian Ctr Astrophys, Fred Lawrence Whipple Observ, Amado, AZ 85645 USA

[3] Univ Coll Dublin, Sch Phys, Dublin 4, Ireland

[4] McGill Univ, Dept Phys, Montreal, PQ H3A 2T8, Canada

[5] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA

[6] Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA

[7] Natl Univ Ireland Galway, Sch Phys, Univ Rd, Galway, Ireland

[8] Purdue Univ, Dept Phys & Astron, W Lafayette, IN 47907 USA

[9] Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China

[10] Tsinghua Univ, Ctr Astrophys, Beijing 100084, Peoples R China

[11] Penn State Univ, Dept Astron & Astrophys, 525 Davey Lab, University Pk, PA 16802 USA

[12] Inst Astron & Fis Espacio, Casilla Correo 67 Sucursal 28,C1428ZAA, Buenos Aires, DF, Argentina

[13] DESY, Platanenallee 6, D-15738 Zeuthen, Germany

[14] Univ Utah, Dept Phys & Astron, Salt Lake City, UT 84112 USA

[15] Univ Minnesota, Sch Phys & Astron, Minneapolis, MN 55455 USA

[16] Calif State Univ East Bay, Dept Phys, Hayward, CA 94542 USA

[17] Adler Planetarium & Astron Museum, Dept Astron, Chicago, IL 60605 USA

[18] Univ Calif Santa Cruz, Santa Cruz Inst Particle Phys, Santa Cruz, CA 95064 USA

[19] Univ Calif Santa Cruz, Dept Phys, Santa Cruz, CA 95064 USA

[20] Univ Delaware, Dept Phys & Astron, Newark, DE 19716 USA

[21] Univ Delaware, Bartol Res Inst, Newark, DE 19716 USA

[22] Columbia Univ, Dept Phys, New York, NY 10027 USA

[23] Univ Iowa, Dept Phys & Astron, Van Allen Hall, Iowa City, IA 52242 USA

[24] Depauw Univ, Dept Phys & Astron, Greencastle, IN 46135 USA

[25] Columbia Univ, Barnard Coll, Dept Phys & Astron, New York, NY 10027 USA

[26] Univ Chicago, Enrico Fermi Inst, Chicago, IL 60637 USA

[27] Univ Potsdam, Inst Phys & Astron, D-14476 Potsdam, Germany

[28] Cork Inst Technol, Dept Phys Sci, Cork, Ireland

[29] Georgia Inst Technol, Sch Phys, 837 State St NW, Atlanta, GA 30332 USA

[30] Georgia Inst Technol, Ctr Relativist Astrophys, 837 State St NW, Atlanta, GA 30332 USA

来源：

ASTROPHYSICAL JOURNAL | 2016年 / 831卷 / 01期

基金：

美国国家科学基金会; 加拿大自然科学与工程研究理事会;

关键词：

acceleration of particles; binaries: general; gamma rays: general; stars:; individual; (V; 404; Cyg; 4U; 0115+634); LS I+61-DEGREES 303; V404; CYGNI; BLACK-HOLE; VERITAS OBSERVATIONS; TEV; EMISSION; TRANSIENTS; SPECTRUM;

D O I：

10.3847/0004-637X/831/1/113

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Transient X-ray binaries produce major outbursts in which the X-ray flux can increase over the quiescent level by factors as large as 10(7). 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 x 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 x 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%.

引用

页数：5

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