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XMM-Newton and Swift spectroscopy of the newly discovered very faint X-ray transient IGR J17494-3030.
Degenaar, N.; Wijnands, R.; Armas Padilla, M.
A growing group of low-mass X-ray binaries are found to be accreting at very faint X-ray luminosities of <1036 erg s-1 (2-10 keV). One such system is the new X-ray transient IGR J17494-3030. We present Swift and XMM-Newton observations obtained during its 2012 discovery outburst. The Swift observations trace the peak of th…
Herschel-ATLAS: correlations between dust and gas in local submm-selected galaxies
Ivison, R. J.; de Zotti, G.; Cooray, A. +21 more
We present an analysis of CO molecular gas tracers in a sample of 500 µm-selected Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS) galaxies at z < 0.05 (cz < 14990 km s-1). Using 22-500 µm photometry from Wide-Field Infrared Survey Explorer, Infrared Astronomical Satellite and Herschel, with H I data from t…
On the hadronic γ-ray emission from tycho's supernova remnant.
Zhang, X.; Chen, Y.; Li, H. +1 more
Hadronic γ-ray emission from supernova remnants (SNRs) is an important tool to test shock acceleration of cosmic-ray protons. Tycho is one of nearly a dozen Galactic SNRs which are suggested to emit hadronic γ-ray emission. Among them, however, it is the only one in which the hadronic emission is proposed to arise from the interaction with a low-d…
INTEGRAL observations of SS433: system's parameters and nutation of supercritical accretion disc
Sunyaev, R. A.; Postnov, K. A.; Cherepashchuk, A. M. +3 more
Based on multiyear INTEGRAL observations of SS433 in 2003-2011, a composite IBIS/ISGRI 18-60 keV orbital light curve is constructed around zero precessional phases ψpr = 0 at the maximum accretion disc opening angle. It shows a peculiar shape with significant excess near the orbital phase φorb = 0.25, which is not seen in the…
Star-planet-debris disc alignment in the HD 82943 system: is planetary system coplanarity actually the norm?
Bryden, G.; Wyatt, M. C.; Kennedy, G. M. +2 more
Recent results suggest that the two planets in the HD 82943 system are inclined to the sky plane by 20 ± 4°. Here, we show that the debris disc in this system is inclined by 27 ± 4°, thus adding strength to the derived planet inclinations and suggesting that the planets and debris disc are consistent with being aligned at a level similar to the So…
A photometric study of chemically peculiar stars with the STEREO satellites - II. Non-magnetic chemically peculiar stars
White, G. J.; Fossati, L.; Paunzen, E. +3 more
We have analysed the photometric data obtained with the STEREO spacecraft for 558 non-magnetic chemically peculiar (CP) stars to search for rotational and pulsational variability. Applying the Lomb-Scargle and the phase dispersion minimization methods, we have detected photometric variability for 44 objects from which 35 were previously unknown. T…
Thomson scattering and collisional ionization in the X-ray grating spectra of the recurrent nova U Scorpii
Nelson, T.; Luna, G. J. M.; Rauch, T. +7 more
We present a Chandra observation of the recurrent nova U Scorpii, done with the High Resolution camera-S (HRC-S) detector and the Low Energy Transmission Grating (LETG) on day 18 after the observed visual maximum of 2010, and compare it with XMM-Newton observations obtained on days 23 and 35 after maximum. The total absorbed flux was in the range …
Far-infrared spectroscopy of a lensed starburst: a blind redshift from {\it herschel}.
Valtchanov, I.; Ivison, R. J.; Clements, D. L. +20 more
We report the redshift of HATLAS J132427.0+284452 (hereafter HATLAS J132427), a gravitationally lensed starburst galaxy, the first determined `blind' by the Herschel Space Observatory. This is achieved via the detection of [C II] consistent with z = 1.68 in a far-infrared spectrum taken with the SPIRE Fourier Transform Spectrometer (FTS). We demon…
Magnetic fields in cometary globules - IV. LBN 437
Lee, Chang Won; Soam, A.; Maheswar, G. +2 more
We present results of our R-band polarimetry of a cometary globule, LBN 437 (Gal 96-15, ℓ = 96°, b = -15°), to study the magnetic field geometry of the cloud. We estimated a distance of 360 ± 65 pc to LBN 437 (also one additional cloud, CB 238) using a near-IR photometric method. The foreground contribution to the observed polarization values was …
Short time-scale AGN X-ray variability with EXOSAT: black hole mass and normalized variability amplitude.
McHardy, I. M.
The old EXOSAT medium energy measurements of high-frequency (HF) active galactic nuclei (AGN) power spectral normalization are re-examined in the light of accurate black hole mass determinations which were not available when these data were first published by Green et al. It is found that the normalized variability amplitude (NVA), measured direct…