Search Publications
X-ray softening in the new X-ray transient XTE J1719-291 during its 2008 outburst decay
Maccarone, T. J.; Degenaar, N.; Wijnands, R. +5 more
The X-ray transient XTE J1719-291 was discovered with Rossi X-ray Timing Explorer/Proportional Counter Array (RXTE/PCA) during its outburst in 2008 March, which lasted at least 46 d. Its 2-10 keV peak luminosity is 7 × 1035 erg s-1 assuming a distance of 8 kpc, which classifies the system as a very faint X-ray transient. The …
A 3D photoionization model of the extreme planetary nebula NGC 6302
Rauch, T.; Barlow, M. J.; Wright, N. J. +1 more
We present a 3D photoionization model of the planetary nebula NGC 6302, one of the most complex and enigmatic objects of its kind. Its highly bipolar geometry and dense massive disc, coupled with the very wide range of ions present, from neutral species up to Si8 +, make it one of the ultimate challenges to nebular photoionization model…
GAMA/H-ATLAS: the ultraviolet spectral slope and obscuration in galaxies
Sutherland, W.; van Kampen, E.; Fritz, J. +59 more
We use multiwavelength data from the Galaxy And Mass Assembly (GAMA) and Herschel-ATLAS (H-ATLAS) surveys to compare the relationship between various dust obscuration measures in galaxies. We explore the connections between the ultraviolet (UV) spectral slope, β, the Balmer decrement and the far-infrared (FIR) to 150 nm far-ultraviolet (FUV) lumin…
Emission geometry, radiation pattern and magnetic topology of the magnetar XTE J1810-197 in its quiescent state
Stella, L.; Rea, N.; Gotthelf, E. V. +3 more
The return to the quiescent state of the anomalous X-ray pulsar (AXP) XTE J1810-197 following its 2003 outburst represents a unique opportunity to probe the surface emission properties of a magnetar. The quiescent emission of XTE J1810-197 is composed of two thermal components, one arising from the whole star surface and the other from a small war…
The cataclysmic variable SDSS J1507+52: an eclipsing period bouncer in the Galactic halo
Uthas, Helena; Long, Knox S.; Thorstensen, John +2 more
SDSS J1507+52 is an eclipsing cataclysmic variable (CV) consisting of a cool, non-radially pulsating white dwarf and an unusually small substellar secondary. The system has a high space velocity and a very short orbital period of about 67 min, well below the usual minimum period for CVs. To explain the existence of this peculiar system, two theori…
An XMM-Newton view of the `bare' nucleus of Fairall 9
Papadakis, I. E.; Bianchi, S.; Emmanoulopoulos, D. +3 more
We present the spectral results from a 130-ks observation, obtained from the X-ray Multi-Mirror Mission-Newton (XMM-Newton) observatory, of the type I Seyfert galaxy Fairall 9. An X-ray hardness ratio analysis of the light curves reveals a ‘softer-when-brighter’ behaviour which is typical of radio-quiet type I Seyfert galaxies. Moreover, we analys…
Dissecting the colour-magnitude diagram: a homogeneous catalogue of stellar populations in globular clusters
Sills, Alison; Knigge, Christian; Leigh, Nathan
We present a homogeneous catalogue for blue straggler, red giant branch, horizontal branch and main-sequence turn-off stars in a sample of 35 clusters taken from the Advanced Camera for Surveys (ACS) Survey for Globular Clusters. As a result of the superior photometry and relatively large field of view offered by the ACS data, this new catalogue i…
The stellar and hot gas content of low-mass galaxy clusters
Balogh, Michael L.; Theuns, Tom; Mazzotta, Pasquale +4 more
We analyse the stellar and hot gas content of 18 nearby, low-mass galaxy clusters, detected in redshift space and selected to have a dynamical mass 3 × 1014 < M/M⊙ < 6 × 1014 (h= 0.7), as measured from the 2dF Galaxy Redshift Survey. We combine X-ray measurements from both Chandra and XMM with ground-based ne…
Discovery of 59 ms pulsations from 1RXS J141256.0+792204 (Calvera)
Haberl, F.; Esposito, P.; Pellizzoni, A. +10 more
We report on the results of a multi-wavelength study of the compact object candidate 1RXS J141256.0+792204 (Calvera). Calvera was observed in the X-rays with XMM-Newton/EPIC twice for a total exposure time of ∼50 ks. The source spectrum is thermal and well reproduced by a two-component model composed of either two (absorbed) hydrogen atmosphere mo…
A SINFONI integral field spectroscopy survey for galaxy counterparts to damped Lyman α systems - II. Dynamical properties of the galaxies towards Q0302 - 223 and Q1009 - 0026
Bouché, Nicolas; York, Donald G.; Kulkarni, Varsha P. +2 more
Details of the processes through which galaxies convert their gas into stars need to be studied in order to obtain a complete picture of galaxy formation. One way to tackle these phenomena is to relate the H I gas and the stars in galaxies. Here, we present dynamical properties of damped and subdamped Lyman α (DLA) systems identified in Hα emissio…