A 78 DAY X-RAY PERIOD DETECTED FROM NGC 5907 ULX1 BY SWIFT

被引：53

作者：

Walton, D. J. ^{[1
,2
]}

Furst, F. ^{[2
]}

Bachetti, M. ^{[3
]}

Barret, D. ^{[4
,5
]}

Brightman, M. ^{[2
]}

Fabian, A. C. ^{[6
]}

Gehrels, N. ^{[7
]}

Harrison, F. A. ^{[2
]}

Heida, M. ^{[2
]}

Middleton, M. J. ^{[6
]}

Rana, V. ^{[2
]}

Roberts, T. P. ^{[8
]}

Stern, D. ^{[1
]}

Tao, L. ^{[2
,9
]}

Webb, N. ^{[4
,5
]}

机构：

[1] CALTECH, Jet Prop Lab, 4800 Oak Grove Dr, Pasadena, CA 91109 USA

[2] CALTECH, Space Radiat Lab, Pasadena, CA 91125 USA

[3] INAF Osservatorio Astron Cagliari, Via Sci 5, I-09047 Selargius, CA, Italy

[4] Univ Toulouse, IRAP, UPS OMP, Toulouse, France

[5] CNRS, IRAP, 9 Av Colonel Roche,BP 44346, F-31028 Toulouse 4, France

[6] Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England

[7] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

[8] Univ Durham, Dept Phys, Ctr Extragalact Astron, South Rd, Durham DH1 3LE, England

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

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2016年 / 827卷 / 01期

关键词：

black hole physics; X-rays: binaries; X-rays: individual (NGC 5907 ULX1); XMM-NEWTON; BLACK-HOLE; BROAD-BAND; M82; X-1; BINARIES; MASS; VARIABILITY; ACCRETION; NUSTAR; PARAMETERS;

D O I：

10.3847/2041-8205/827/1/L13

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the detection of a 78.1 +/- 0.5 day period in the X-ray light curve of the extreme ultraluminous X-ray source NGC 5907 ULX1 (L-X,L-peak similar to 5 x 10(40) erg s(-1)), discovered during an extensive monitoring program with Swift. These periodic variations are strong, with the observed flux changing by a factor of similar to 3-4 between the peaks and the troughs of the cycle; our simulations suggest that the observed periodicity is detected comfortably in excess of 3 sigma significance. We discuss possible origins for this X-ray period, but conclude that at the current time we cannot robustly distinguish between orbital and super-orbital variations.

引用

页数：6

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