Search Publications
Testing rate-dependent corrections on timing mode EPIC-pn spectra of the accreting neutron star GX 13+1
Sanna, A.; Guainazzi, M.; Robba, N. R. +6 more
When the EPIC-pn instrument on board XMM-Newton is operated in Timing mode, high count rates (>100 counts s-1) of bright sources may affect the calibration of the energy scale, resulting in a modification of the real spectral shape. The corrections related to this effect are then strongly important in the study of the spectral proper…
CH in absorption in IRAS 16293-2422
Ceccarelli, C.; Caux, E.; Vastel, C. +3 more
While recent studies of the solar-mass protostar IRAS 16293-2422 have focused on its inner arcsecond, the wealth of Herschel/Heterodyne Instrument for the Far-Infrared (HIFI) data has shown that the structure of the outer envelope and of the transition region to the more diffuse interstellar medium is not clearly constrained. We use rotational gro…
Dwarf galaxies in the Perseus Cluster: further evidence for a disc origin for dwarf ellipticals
Penny, Samantha J.; Forbes, Duncan A.; Pimbblet, Kevin A. +1 more
We present the results of a Keck-ESI (Echellette Spectrograph and Imager) spectroscopic study of six dwarf elliptical (dE) galaxies in the Perseus Cluster core, and confirm two dwarfs as cluster members for the first time. All six dEs follow the size-magnitude relation for dE/dSph galaxies. Central velocity dispersions are measured for three Perse…
Separate constraints on early and late cosmology
Audren, B.
Since the public release of Planck data, several attempts have been made to explain the observed small tensions with other data sets, most of them involving an extension of the Λ cold dark matter (ΛCDM) model. We try here an alternative approach to the data analysis, based on separating the constraints coming from the different epochs in cosmology…
Variations in the pulsation and spectral characteristics of OAO 1657-415
Maitra, Chandreyee; Paul, Biswajit; Pradhan, Pragati +2 more
We present broad-band pulsation and spectral characteristics of the accreting X-ray pulsar OAO 1657-415 with a 2.2 d long Suzaku observation carried out covering its orbital phase range ∼0.4-0.6, with respect to the mid-eclipse. During the last third of the observation, the X-ray count rate in both the X-ray Imaging Spectrometer (XIS) and the HXD-…
Galactic winds and stellar populations in Lyman α emitting galaxies at z ∼ 3.1
Finkelstein, S. L.; Malhotra, S.; Rhoads, J. E. +4 more
We present a sample of 33 spectroscopically confirmed z ∼ 3.1 Lyα-emitting galaxies (LAEs) in the Cosmological Evolution Survey (COSMOS) field. This paper details the narrow-band survey we conducted to detect the LAE sample, the optical spectroscopy we performed to confirm the nature of these LAEs, and a new near-infrared spectroscopic detection o…
The bow shock, cold fronts and disintegrating cool core in the merging galaxy group RX J0751.3+5012
Fabian, A. C.; McNamara, B. R.; Russell, H. R. +6 more
We present a new Chandra X-ray observation of the off-axis galaxy group merger RX J0751.3+5012. The hot atmospheres of the two colliding groups appear highly distorted by the merger. The images reveal arc-like cold fronts around each group core, produced by the motion through the ambient medium, and the first detection of a group merger shock fron…
ULASJ1234+0907: the reddest type 1 quasar at z = 2.5 revealed in the X-ray and far-infrared.
Fabian, A. C.; Banerji, M.; McMahon, R. G.
We present Herschel and XMM-Newton observations of ULASJ1234+0907 (z = 2.503), the reddest broad-line type 1 quasar currently known with (i - K)AB > 7.1. Herschel observations indicate that the quasar host is a hyperluminous infrared galaxy with a total infrared luminosity of log10(LIR/L⊙) = 13.90 ± 0…
Large-scale gas sloshing out to half the virial radius in the strongest cool core REXCESS galaxy cluster, RXJ2014.8-2430.
Fabian, A. C.; Sanders, J. S.; Walker, S. A.
We search the cool core galaxy clusters in the REXCESS sample for evidence of large-scale gas sloshing, and find clear evidence for sloshing in RXJ2014.8-2430, the strongest cool core cluster in the REXCESS cluster sample. The residuals of the surface brightness distribution from the azimuthal average for RXJ2014 show a prominent swirling excess f…
Radio-continuum study of Large Magellanic Cloud supernova remnant J0509-6731
Filipović, M. D.; Kothes, R.; Bozzetto, L. M. +2 more
We present a detailed study of Australia Telescope Compact Array observations (λ = 20, 13, 6 and 3 cm) of supernova remnant (SNR) J0509-6731 in the Large Magellanic Cloud. The remnant has a ring morphology with brightened regions towards the south-western limb. We also find a second brightened inner ring which is only seen in the radio continuum. …