X-ray follow-ups of XSS J12270-4859: a low-mass X-ray binary with gamma-ray Fermi-LAT association

被引：93

作者：

de Martino, D. ^{[1
]}

Belloni, T. ^{[2
]}

Falanga, M. ^{[3
]}

Papitto, A. ^{[4
]}

Motta, S. ^{[2
]}

Pellizzoni, A. ^{[5
]}

Evangelista, Y. ^{[6
]}

Piano, G. ^{[6
]}

Masetti, N. ^{[7
]}

Bonnet-Bidaud, J. -M. ^{[8
]}

Mouchet, M. ^{[9
,10
]}

Mukai, K. ^{[11
,12
,13
]}

Possenti, A. ^{[5
]}

机构：

[1] INAF, Osservatorio Astron Capodimonte, I-80131 Naples, Italy

[2] INAF, Osservatorio Astron Brera, I-23807 Merate, LC, Italy

[3] ISSI, CH-3012 Bern, Switzerland

[4] Inst Ciencie Espai IEEC CSIC, Fac Ciencies, Barcelona 08193, Spain

[5] INAF, Osservatorio Astron Cagliari, I-09012 Capoterra, CA, Italy

[6] INAF, Ist Astrofis Spaziale & Planetol Spaziali, I-00133 Rome, Italy

[7] INAF, Ist Astrofis Spaziale, I-40129 Bologna, Italy

[8] CEA Saclay, DSM, Irfu, Serv Astrophys, F-91191 Gif Sur Yvette, France

[9] Univ Paris 07, Lab APC, F-75005 Paris, France

[10] Observ Paris, LUTH, Sect Meudon, F-92195 Meudon, France

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

[12] NASA, Goddard Space Flight Ctr, Xray Astrophys Lab, Greenbelt, MD 20771 USA

[13] Univ Maryland, Dept Phys, Baltimore, MD 21250 USA

来源：

ASTRONOMY & ASTROPHYSICS | 2013年 / 550卷

关键词：

accretion; accretion disks; X-rays: binaries; gamma rays: stars; binaries: close; MILLISECOND PULSATIONS; CATACLYSMIC VARIABLES; LOW/HARD STATE; BLACK-HOLES; EMISSION; SEARCHES; PULSARS; DISCOVERY; STARS;

D O I：

10.1051/0004-6361/201220393

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Context. XSS J1227.0-4859 is a peculiar, hard X-ray source recently positionally associated to the Fermi-LAT source 1FGL J1227.9-4852/2FGL J1227.7-4853. Multi-wavelength observations have added information on this source, indicating a low-luminosity low-mass X-ray binary (LMXB), but its nature is still unclear. Aims. To progress in our understanding, we present new X-ray data from a monitoring campaign performed in 2011 with the XMM-Newton, RXTE, and Swift satellites and combine them with new gamma-ray data from the Fermi and AGILE satellites. We complement the study with simultaneous near-UV photometry from XMM-Newton and with previous UV/optical and near-IR data. Methods. We analysed the temporal characteristics in the X-rays, near-UV, and gamma rays and studied the broad-band spectral energy distribution from radio to gamma rays. Results. The X-ray history of XSS J1227 over 7 yr shows a persistent and rather stable low-luminosity (6 x 10(33) d(1kpc)(2) erg s(-1)) source, with flares and dips being peculiar and permanent characteristics. The associated Fermi-LAT source 2FGL J1227.7-4853 is also stable over an overlapping period of 4.7 yr. Searches for X-ray fast pulsations down to msec give upper limits to pulse fractional amplitudes of 15-25% that do not rule out a fast spinning pulsar. The combined UV/optical/near-IR spectrum reveals a hot component at similar to 13 kK and a cool one at similar to 4.6 kK. The latter would suggest a late-type K2-K5 companion star, a distance range of 1.4-3.6 kpc, and an orbital period of 7-9 h. A near-UV variability (greater than or similar to 6 h) also suggests a longer orbital period than previously estimated. Conclusions. The analysis shows that the X-ray and UV/optical/near-IR emissions are more compatible with an accretion-powered compact object than with a rotational powered pulsar. The X-ray to UV bolometric luminosity ratio could be consistent with a binary hosting a neutron star, but the uncertainties in the radio data may also allow an LMXB black hole with a compact jet. In this case, it would be the first associated with a high-energy gamma-ray source.

引用

页数：16

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