Search Publications
A transient, flat spectrum radio pulsar near the Galactic Centre
Degenaar, N.; Kerr, M.; Kramer, M. +6 more
Recent studies have shown possible connections between highly magnetized neutron stars ('magnetars'), whose X-ray emission is too bright to be powered by rotational energy, and ordinary radio pulsars. In addition to the magnetar SGR J1745-2900, one of the radio pulsars in the Galactic Centre (GC) region, PSR J1746-2850, had timing properties imply…
Variable quiescent state for the neutron-star X-ray transient SAX J1750.8-2900: not such a hot neutron star after all?
Wijnands, R.; Parikh, A. S.
We monitored the neutron star low-mass X-ray binary SAX J1750.8-2900 after the end of its 2015/2016 outburst using the X-ray Telescope (XRT) aboard Swift to detect possible post-outburst 'rebrightenings', similar to those seen after its 2008 outburst. We did not detect any rebrightening behaviour, suggesting that the physical mechanism behind the …
Further evidence for a quasar-driven jet impacting its neighbour galaxy: The saga of HE0450-2958 continues
Elbaz, D.; Sargent, M. T.; Papadopoulos, P. P. +2 more
HE0450-2958, an interacting quasar-starburst galaxy pair at z = 0.285, is one of the best-known examples of strong star formation activity in the presence of a quasar-driven jet. We present new multiband Karl G. Jansky Very Large Array-imaging covering 1-6 GHz and reaching an angular resolution of up to 0.6 arcsec (a sixfold improvement over exist…
On the dust and gas components of the z = 2.8 gravitationally lensed quasar host RX J0911.4+0551
Tuan-Anh, P.; Hoai, D. T.; Nhung, P. T. +4 more
Observations by the Atacama Large Millimetre/sub-millimetre Array of the 358 GHz continuum emission of the gravitationally lensed quasar host RX J0911.4+0551 have been analysed. They complement earlier Plateau de Bure Interferometer observations of the CO(7-6) emission. The good knowledge of the lensing potential obtained from the Hubble Space Tel…
2D kinematic study of the central region of NGC 4501
Rodrigues, I.; Repetto, P.; Faúndez-Abans, M. +2 more
Gemini Multi-Object Spectrograph and its Integral Field Unit observational data were used to study the detailed 2D gas kinematics and morphological structures within the ∼500 × 421 pc2 of the active Seyfert 2 galaxy NGC 4501. We provide empirical pieces of evidence of possible outflowing material from the central zones of NGC 4501 to th…
Panchromatic spectral energy distributions of simulated galaxies: results at redshift z = 0
Annunziatella, Marianna; Obreja, Aura; Granato, Gian Luigi +5 more
We present predictions of spectral energy distributions (SEDs), from the UV to the FIR, of simulated galaxies at z = 0. These were obtained by post-processing the results of an N-body+hydro simulation of a cosmological box of side 25 Mpc, which uses the Multi-Phase Particle Integrator (MUPPI) for star formation and stellar feedback, with the grasi…
X-ray lags in PDS 456 revealed by Suzaku observations
Fabian, A. C.; Reynolds, C. S.; Cackett, E. M. +5 more
X-ray reverberation lags from the vicinity of supermassive black holes have been detected in almost 30 active galactic nuclei (AGNs). The soft lag, which is the time delay between the hard and soft X-ray light curves, is usually interpreted as the time difference between the direct and reflected emission, but is alternatively suggested to arise fr…
Excess entropy and energy feedback from within cluster cores up to r200
Ettori, Stefano; Eckert, Dominique; Majumdar, Subhabrata +3 more
We estimate the 'non-gravitational' entropy-injection profiles, ΔK, and the resultant energy feedback profiles, ΔE, of the intracluster medium for 17 clusters using their Planck Sunyaev-Zel'dovich and ROSAT X-ray observations, spanning a large radial range from 0.2r500 up to r200. The feedback profiles are estimated by compar…
The most massive galaxies in clusters are already fully grown at z ∼ 0.5
Davies, Roger L.; Houghton, R. C. W.; Oldham, L. J.
By constructing scaling relations for galaxies in the massive cluster MACSJ0717.5 at z = 0.545 and comparing with those of Coma, we model the luminosity evolution of the stellar populations and the structural evolution of the galaxies. We calculate magnitudes, surface brightnesses and effective radii using Hubble Space Telescope (HST)/ACS images a…
Colour gradients in cluster ellipticals at z ∼ 1.4: the hidden content of the galaxy central regions
Gargiulo, A.; Saracco, P.; De Propris, R. +1 more
We present F775W-F850LP (rest-frame UV - U) and F850LP-F160W (rest-frame U - R) colour gradients for a sample of 17 elliptical galaxies morphologically selected in the cluster XMMU J2235.3-2557 at z = 1.39. We detected significant negative (redder inwards) U - R colour gradients in ∼70 per cent of the galaxies and flat gradients for the remaining …