Search Publications
Relativistically broadened iron line in the Suzaku observation of the neutron star X-ray binary 4U 1705-44
Young, A. J.; Fabian, A. C.; Reis, R. C.
The X-ray spectra of accreting compact objects often exhibit discrete emission features associated with fluorescent emission in the accretion disc, the strongest of which is the Fe Kα fluorescence line at 6.4-6.97keV. These reflection features are amongst the best tools in the study of the inner region of accretion flow around a compact object. He…
Non-parametric strong lens inversion of SDSS J1004+4112
de Rijcke, S.; Dejonghe, H.; Liesenborgs, J. +1 more
In this article, we study the well-known strong lensing system SDSS J1004+4112. Not only does it host a large-separation lensed quasar with measured time-delay information, but several other lensed galaxies have been identified as well. A previously developed strong lens inversion procedure that is designed to handle a wide variety of constraints …
HI in very metal-poor galaxies: the SBS 0335-052 system
Chengalur, Jayaram N.; Ekta, B.; Pustilnik, Simon A.
We present Giant Metrewave Radio Telescope, HI 21 cm observations of SBS 0335-052E and SBS 0335-052W, a close pair of dwarf galaxies, which are further unusual in being the most metal-poor star-forming galaxies known. We present images at several angular resolutions, ranging from ~40 to 4 arcsec. These images show that SBS 0335-052 is a strongly i…
Cometary masses derived from non-gravitational forces
Sosa, Andrea; Fernández, Julio A.
We compute masses and densities for 10 periodic comets with known sizes: 1P/Halley, 2P/Encke, 6P/d'Arrest, 9P/Tempel 1, 10P/Tempel 2, 19P/Borrelly, 22P/Kopff, 46P/Wirtanen, 67P/Churyumov-Gerasimenko and 81P/Wild 2. The method follows the one developed by Rickman and colleagues, which is based on the gas production curve and on the change in the or…
Delayed X-ray emission from fallback in compact-object mergers
Begelman, Mitchell C.; Rossi, Elena M.
When double neutron star or neutron star-black hole binaries merge, the final remnant may comprise a central solar-mass black hole surrounded by a ~0.01-0.1Msolar torus. The subsequent evolution of this disc may be responsible for short γ-ray bursts (SGRBs). A comparable amount of mass is ejected into eccentric orbits and will eventuall…
An atlas of predicted exotic gravitational lenses
Marshall, Phil; Orban de Xivry, Gilles
Wide-field optical imaging surveys will contain tens of thousands of new strong gravitational lenses. Some of these will have new and unusual image configurations, and so will enable new applications: for example, systems with high image multiplicity will allow more detailed study of galaxy and group mass distributions, while high magnification is…
Integral field spectroscopy of ionized and molecular gas in cool cluster cores: evidence for cold feedback?
Swinbank, A. M.; Edge, A. C.; Wilman, R. J.
We present VLT-SINFONI K-band integral field spectroscopy of the central galaxies in the cool core clusters A1664, A2204 and PKS 0745-191, to probe the spatio-kinematic properties of the Paα and ro-vibrational H2 line emission.
In A1664, the two emission-line velocity systems seen in our previous Hα spectroscopy appear in both Paα …CO line emission in the halo of a radio galaxy at z = 2.6
Omont, A.; Boulanger, F.; Walter, F. +6 more
We report the detection of luminous CO(3-2) line emission in the halo of the z = 2.6 radio galaxy (HzRG) TXS0828+193, which has no detected counterpart at optical to mid-infrared wavelengths implying a stellar mass <~ few ×109Msolar and relatively low star formation rates. With the IRAM Plateau de Bure Interferometer (PdBI…
SAXJ1808.4-3658: high-resolution spectroscopy and decrease of pulsed fraction at low energies
Wijnands, R.; Rea, Nanda; van der Klis, M. +3 more
XMM-Newton observed the accreting millisecond pulsar SAX J1808.4-3658 during its 2008 outburst. We present timing and spectral analyses of this observation, in particular the first pulse profile study below 2keV, and the high-resolution spectral analysis of this source during the outburst. Combined spectral and pulse profile analyses suggest the p…
GRB060602B = Swift J1749.4-2807: an unusual transiently accreting neutron-star X-ray binary
Wijnands, R.; Rol, E.; Starling, R. L. C. +2 more
We present an analysis of the Swift Burst Alert Telescope (BAT) and X-ray telescope (XRT) data of GRB060602B, which is most likely an accreting neutron star in a binary system and not a gamma-ray burst. Our analysis shows that the BAT burst spectrum is consistent with a thermonuclear flash (type I X-ray burst) from the surface of an accreting neut…