Search Publications
Herschel-ATLAS/GAMA: What determines the far-infrared properties of radio galaxies?
de Zotti, G.; Cooray, A.; Ibar, E. +20 more
We perform a stacking analysis of Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS) data in order to obtain isothermal dust temperatures and rest-frame luminosities at 250 µm (L250), for a well-defined sample of 1599 radio sources over the H-ATLAS Phase 1/Galaxy and Mass Assembly (GAMA) area. The radio sample is generat…
Stokes imaging of AM Her systems using 3D inhomogeneous models - II. Modelling X-ray and optical data of CP Tucanae
Costa, J. E. R.; Rodrigues, C. V.; Silva, K. M. G. +3 more
The viewing geometry of the polar CP Tuc that better explains its optical and X-ray light curves is controversial. Previous modelling of white-light polarimetric data considered the partial self-eclipse of an extended inhomogeneous emitting region. Alternatively, phase-dependent absorption has been used to reproduce the X-ray data. This paper pres…
The X-ray properties of optically selected clusters of galaxies
Böhringer, H.; Pratt, G. W.; Croston, J. H. +7 more
We present the results of Chandra and Suzaku X-ray observations of nine moderate-redshift (0.16 < z < 0.42) clusters discovered via the Red-sequence Cluster Survey (RCS). Surface brightness profiles are fitted to β-models, gas masses are determined, integrated spectra are extracted within R2500, and X-ray temperatures and luminosi…
Swift J045106.8-694803: a highly magnetized neutron star in the Large Magellanic Cloud
Udalski, A.; Bartlett, E. S.; Bird, A. J. +3 more
We report the analysis of a highly magnetized neutron star in the Large Magellanic Cloud (LMC). The high-mass X-ray binary pulsar Swift J045106.8-694803 has been observed with Swift X-ray telescope (XRT) in 2008, the Rossi X-ray Timing Explorer (RXTE) in 2011 and the X-ray Multi-Mirror Mission-Newton (XMM-Newton) in 2012. The change in spin period…
Discovery of the spectroscopic binary nature of three bright southern Cepheids
Szabados, L.; Derekas, A.; Anderson, R. I. +4 more
We present an analysis of spectroscopic radial velocity and photometric data of three bright Galactic Cepheids: LR Trianguli Australis (LR TrA), RZ Velorum (RZ Vel) and BG Velorum (BG Vel). Based on new radial velocity data, these Cepheids have been found to be members of spectroscopic binary systems. The ratio of the peak-to-peak radial velocity …
IRAS 19520+2759: a 105 L⊙ massive young stellar object driving a collimated outflow
Sahai, R.; Sánchez Contreras, C.; Palau, Aina +2 more
The theory of massive star formation currently suffers from a scarce observational base of massive young stellar objects to compare with. In this paper, we present interferometric 12CO (1-0), 13CO (1-0), C18O (1-0) and 2.6 mm continuum images of the infrared source IRAS 19520+2759 together with complementary single…
µ Eridani from MOST and from the ground: an orbit, the SPB component's fundamental parameters and the SPB frequencies
Niemczura, E.; Leto, G.; Jerzykiewicz, M. +15 more
MOST time series photometry of µ Eri, an SB1 eclipsing binary with a rapidly rotating SPB primary, is reported and analysed. The analysis yields a number of sinusoidal terms, mainly due to the intrinsic variation of the primary, and the eclipse light curve. New radial-velocity observations are presented and used to compute parameters of a sp…
Variable X-ray reflection from 1H 0419-577
Dewangan, Gulab C.; Pal, Main
We present detailed broad-band X-ray spectral variability of a Seyfert 1 galaxy 1H 0419-577 based on an archival Suzaku observation in 2007 July, a new Suzaku observation performed in 2010 January and the two latest XMM-Newton observations from 2010 May. All the observations show soft X-ray excess emission below 2 keV and both Suzaku observations …
X-ray spectral analysis of the low-luminosity active galactic nucleus NGC 7213 using long XMM-Newton observations
Papadakis, I. E.; Emmanoulopoulos, D.; Nicastro, F. +1 more
We present the X-ray spectral results from the longest X-ray Multi-mirror Mission-Newton observation, 133 ks, of the low-luminosity active galactic nucleus NGC 7213. The hardness-ratio analysis of the X-ray light curves discloses a rather constant X-ray spectral shape, at least for the observed exposure time, enabling us to perform X-ray spectral …
An XMM-Newton view of the merging activity in the Centaurus cluster
Fabian, A. C.; Sanders, J. S.; Walker, S. A.
We report the results of XMM-Newton observations of the regions around the core of the Centaurus cluster where evidence for merging activity between the subgroup Cen 45 and the main Centaurus cluster has previously been observed using ASCA and ROSAT data. We confirm the ASCA findings of a temperature excess surrounding Cen 45. We find that this te…