Swift X-Ray and UV Observations of six Gaia Binaries supposedly containing a Neutron Star
Astronomy & Astrophysics(2024)
摘要
Recent observations have led to the discovery of numerous optically selected
binaries containing an undetected component with mass consistent with a compact
object (neutron star or white dwarf). Using the the Neil Gehrels Swift
Observatory we have carried out X-ray and UV observations of a small sample of
these binaries. Four systems are wide (with orbital period P>300 d), and they
were chosen because of their small distance (d<250 pc) and the mass of the
collapsed component favoring a neutron star. Two other are compact systems
(P<0.9 d), with convincing evidence of containing a neutron star. The source
2MASS J15274848$+$3536572 was detected in the X-ray band, with a flux of 5E-13
erg/cm2/s and a spectrum well fitted by a power law or a thermal plasma
emission model. This source also showed an UV (2200 Angstrom) excess, which
might indicate the presence of mass accretion. For the other targets we derived
X-ray flux upper limits of the order of 1E-13}$ erg/cm2/s . These results are
consistent with the hypothesis that the collapsed component in these six
systems are neutron stars.
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