Bibcode
Casares, J.; Bird, A. J.; Cornelisse, R.; Charles, P. A.; Shaw, A. W.; Lewis, F.; Muñoz-Darias, T.; Russell, D. M.; Zurita, C.
Referencia bibliográfica
Monthly Notices of the Royal Astronomical Society, Volume 433, Issue 1, p.740-745
Fecha de publicación:
7
2013
Número de citas
19
Número de citas referidas
17
Descripción
We have discovered a ˜420-d modulation, with associated X-ray
dips, in Rossi X-Ray Timing Explorer-All Sky Monitor/Monitor of All-Sky
X-ray Image/Swift-Burst Alert Telescope archival light curves of the
short-period (3.2 h) black hole X-ray transient, Swift J1753.5-0127.
This modulation only appeared at the end of a gradual re-brightening,
approximately 3 yr after the initial X-ray outburst in mid-2005. The
same periodicity is present in both the 2-20 and 15-50 keV bands, but
with a ˜0.1 phase offset (≈40 d). Contemporaneous photometry in
the optical and near-infrared reveals a weaker modulation, but
consistent with the X-ray period. There are two substantial X-ray dips
(very strong in the 15-50 keV band, weaker at lower energies) that are
separated by an interval equal to the X-ray period. This likely
indicates two physically separated emitting regions for the hard X-ray
and lower energy emission. We interpret this periodicity as a property
of the accretion disc, most likely a long-term precession, where the
disc edge structure and X-ray irradiation are responsible for the hard
X-ray dips and modulation, although we discuss other possible
explanations, including Lense-Thirring precession in the inner disc
region and spectral state variations. Such precession indicates a very
high mass ratio low-mass X-ray binary, which even for a ˜10
M⊙ BH requires a brown dwarf donor (˜0.02
M⊙), making Swift J1753.5-0127 a possible analogue of
millisecond X-ray pulsars. We compare the properties of Swift
J1753.5-0127 with other recently discovered short-period transients,
which are now forming a separate population of high-latitude BH
transients located in the galactic halo.
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