Bibcode
Mata Sánchez, D.; Muñoz-Darias, T.; Casares, J.; Corral-Santana, J. M.; Shahbaz, T.
Referencia bibliográfica
Monthly Notices of the Royal Astronomical Society, Volume 454, Issue 2, p.2199-2204
Fecha de publicación:
12
2015
Número de citas
51
Número de citas referidas
48
Descripción
Swift J1357.2-0933 is one of the shortest orbital period black hole
X-ray transients. It exhibited deep optical dips together with an
extremely broad H α line during outburst. We present 10.4-m Gran
Telescopio Canarias (GTC) time-resolved spectroscopy during quiescence
searching for donor star absorption features. The large contribution of
the accretion flow to the total luminosity prevents the direct detection
of the companion. Nevertheless, we constrain the non-stellar
contribution to be larger than ˜80 per cent of the total optical
light, which sets new lower limits to the distance (d > 2.29 kpc) and
the height over the Galactic plane (z > 1.75 kpc). This places the
system in the Galactic thick disc. We measure a modulation in the
centroid of the H α line with a period of P = 0.11 ± 0.04 d
which, combined with the recently presented full width at
half-maximum-K2 correlation, results in a massive black hole
(M1 > 9.3 M⊙) and an ˜M2V companion
star (M2 ˜ 0.4 M⊙). We also present
further evidence supporting a very high orbital inclination (i ≳
80°).
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