4,000 research outputs found
The puzzling symbiotic X-ray system 4U1700+24
Symbiotic X-ray binaries form a subclass of low-mass X-ray binary systems
consisting of a neutron star accreting material from a red giant donor star via
stellar wind or Roche lobe overflow. Only a few confirmed members are currently
known; 4U 1700+24 is a good candidate as it is a relatively bright X-ray
object, possibly associated with the late-type star V934 Her. We analysed the
archive {\it XMM}-Newton and Swift/XRT observations of 4U 1700+24 in order to
have a uniform high-energy ( keV) view of the source. We confirmed the
existence of a red-shifted O VIII Ly- transition (already observed in
the 2002 {\it XMM}-Newton data) in the high-resolution spectra collected via
the RGS instruments. The red-shift of the line is found in all the analysed
observations and, on average, it was estimated to be . We also
observed a modulation of the centroid energy of the line on short time scales
(a few days) and discuss the observations in the framework of different
scenarios. If the modulation is due to the gravitational red-shift of the
neutron star, it might arise from a sudden re-organization of the emitting
-ray matter on the scale of a few hundreds of km. Alternatively, we are
witnessing a uni-polar jet of matter (with typical velocity of km
s) possibly emitted by the neutron star in an almost face-on system. The
second possibility seems to be required by the apparent lack of any modulation
in the observed -ray light curve. We also note also that the low-resolution
spectra (both {\it XMM}-Newton and Swift/XRT in the keV band) show the
existence of a black body radiation emitted by a region (possibly associated
with the neutron star polar cap) with typical size from a few tens to hundreds
of meters. The size of this spot-like region reduces as the overall luminosity
of 4U 1700+24 decreases.Comment: In press on A&
Unveiling the hard X-ray spectrum from the "burst-only" source SAX J1753.5-2349 in outburst
Discovered in 1996 by BeppoSAX during a single type-I burst event, SAX
J1753.5-2349 was classified as "burst-only" source. Its persistent emission,
either in outburst or in quiescence, had never been observed before October
2008, when SAX J1753.5-2349 was observed for the first time in outburst. Based
on INTEGRAL observations,we present here the first high-energy emission study
(above 10 keV) of a so-called "burst-only". During the outburst the SAX
J1753.5-2349 flux decreased from 10 to 4 mCrab in 18-40 keV, while it was found
being in a constant low/hard spectral state. The broad-band (0.3-100 keV)
averaged spectrum obtained by combining INTEGRAL/IBIS and Swift/XRT data has
been fitted with a thermal Comptonisation model and an electron temperature >24
keV inferred. However, the observed high column density does not allow the
detection of the emission from the neutron star surface. Based on the whole set
of observations of SAX J1753.5-2349, we are able to provide a rough estimate of
the duty cycle of the system and the time-averaged mass-accretion rate. We
conclude that the low to very low luminosity of SAX J1753.5-2349 during
outburst may make it a good candidate to harbor a very compact binary system.Comment: 5 pages, 3 figures, 2 tables; accepted for publication in MNRAS
Letter
Unveiling the nature of IGR J17177-3656 with X-ray, NIR and Radio observations
We report on the first broad-band (1-200 keV) simultaneous Chandra-INTEGRAL
observations of the recently discovered hard X-ray transient IGR J17177-3656
that took place on 2011, March 22, about two weeks after the source discovery.
The source had an average absorbed 1-200 keV flux of about 8x10^(-10) erg
cm^(-2) s^(-1). We extracted a precise X-ray position of IGR J17177-3656, RA=17
17 42.62, DEC= -36 56 04.5 (90% uncertainty of 0.6"). We also report Swift,
near infrared and quasi simultaneous radio follow-up observations. With the
multi-wavelength information at hand, we propose IGR J17177-3656 is a low-mass
X-ray binary, seen at high inclination, probably hosting a black hole.Comment: 8 pages, 8 figures, accepted for publication in Ap
Spectral variability modes of GX 339-4 in a hard-to-soft state transition
We report on INTEGRAL observations performed during the 2004 outburst of the
bright black hole transient GX 339-4. We analysed IBIS and JEM-X public data
starting on 9th August and lasting about one month. During this period GX 339-4
showed spectral state transitions. In order to seek for variability patterns, a
principal component analysis (PCA) has been used.Comment: 5 pages, 6 figures, accepted for publication in the proceedings of VI
Microquasar workshop: Microquasar and Beyond, 18-22 September 2006 in Como
(Italy), eds: T. Belloni et al. (2006
New orbital ephemerides for the dipping source 4U 1323-619: constraining the distance to the source
4U 1323-619 is a low mass X-ray binary system that shows type I X-ray bursts
and dips. The most accurate estimation of the orbital period is 2.941923(36)
hrs and a distance from the source that is lower than 11 kpc has been proposed.
We aim to obtain the orbital ephemeris, the orbital period of the system, as
well as its derivative to compare the observed luminosity with that predicted
by the theory of secular evolution. We took the advantage of about 26 years of
X-ray data and grouped the selected observations when close in time. We folded
the light curves and used the timing technique, obtaining 12 dip arrival times.
We fit the delays of the dip arrival times both with a linear and a quadratic
function. We locate 4U 1323-619 within a circular area centred at RA (J2000)=
201.6543\degree and DEC (J2000)= -62.1358\degree with an associated error of
0.0002\degree, and confirm the detection of the IR counterpart already
discussed in literature. We estimate an orbital period of P=2.9419156(6) hrs
compatible with the estimations that are present in the literature, but with an
accuracy ten times higher. We also obtain a constraint on the orbital period
derivative for the first time, estimating
s/s. Assuming that the companion star is in thermal equilibrium in the lower
main sequence, and is a neutron star of 1.4 M, we infer a mass of
0.280.03 M for the companion star. Assuming a distance of 10
kpc, we obtained a luminosity of (4.30.5) erg s,
which is not in agreement with what is predicted by the theory of secular
evolution. Using a 3D extinction map of the K radiation in our Galaxy, we
obtain a distance of 4.2 kpc at 68\% confidence level.
(Abridged)Comment: 10 pages, 8 figures, accepted for publication in Astronomy &
Astrophysic
Desenvolvimento de modelo de calibração por meio de nir`s para a especie de forrageira alfafa (medicago sativa).
- …