Search Publications
Formation and X-ray emission from hot bubbles in planetary nebulae - II. Hot bubble X-ray emission
Toalá, J. A.; Arthur, S. J.
We present a study of the X-ray emission from numerical simulations of hot bubbles in planetary nebulae (PNe). High-resolution, two-dimensional, radiation-hydrodynamical simulations of the formation and evolution of hot bubbles in PNe, with and without thermal conduction, are used to calculate the X-ray emission and study its time-dependence and r…
A search for X-ray reprocessing echoes in the power spectral density functions of AGN
Papadakis, I. E.; Emmanoulopoulos, D.; Dovčiak, M. +3 more
We present the results of a detailed study of the X-ray power spectral density (PSD) functions of 12 X-ray bright AGN, using almost all the archival XMM-Newton data. The total net exposure of the EPIC-pn light curves is larger than 350 ks in all cases (and exceeds 1 Ms in the case of 1H 0707-497). In a physical scenario in which X-ray reflection o…
A GMRT study of Seyfert galaxies NGC 4235 and NGC 4594: evidence of episodic activity?
Singh, V.; Ishwara-Chandra, C. H.; Kharb, P. +3 more
Low-frequency observations at 325 and 610 MHz have been carried out for two `radio-loud' Seyfert galaxies, NGC 4235 and NGC 4594 (Sombrero galaxy), using the Giant Meterwave Radio Telescope (GMRT). The 610 MHz total intensity and 325-610 MHz spectral index images of NGC 4235 tentatively suggest the presence of a `relic' radio lobe, most likely fro…
The evolution of the Sun's birth cluster and the search for the solar siblings with Gaia
Brown, A. G. A.; Antoja, T.; Portegies Zwart, S. +3 more
We use self-consistent numerical simulations of the evolution and disruption of the Sun's birth cluster in the Milky Way potential to investigate the present-day phase-space distribution of the Sun's siblings. The simulations include the gravitational N-body forces within the cluster and the effects of stellar evolution on the cluster population. …
LENSED: a code for the forward reconstruction of lenses and sources from strong lensing observations
Metcalf, R. Benton; Tessore, Nicolas; Bellagamba, Fabio
Robust modelling of strong lensing systems is fundamental to exploit the information they contain about the distribution of matter in galaxies and clusters. In this work, we present LENSED, a new code which performs forward parametric modelling of strong lenses. LENSED takes advantage of a massively parallel ray-tracing kernel to perform the neces…
Herschel far-infrared photometry of the Swift Burst Alert Telescope active galactic nuclei sample of the local universe - II. SPIRE observations
Mushotzky, Richard F.; Cowie, Lennox L.; Barger, Amy J. +3 more
We present far-infrared (FIR) and submillimetre photometry from the Herschel Space Observatory's Spectral and Photometric Imaging Receiver (SPIRE) for 313 nearby (z < 0.05) active galactic nuclei (AGN). We selected AGN from the 58 month Swift Burst Alert Telescope (BAT) catalogue, the result of an all-sky survey in the 14-195 keV energy band, a…
Local analyses of Planck maps with Minkowski functionals
Novaes, C. P.; Bernui, A.; Ferreira, I. S. +1 more
Minkowski functionals (MF) are excellent tools to investigate the statistical properties of the cosmic background radiation (CMB) maps. Between their notorious advantages is the possibility to use them efficiently in patches of the CMB sphere, which allow studies in masked skies, inclusive analyses of small sky regions. Then, possible deviations f…
Feeding and feedback in NGC 3081
Robinson, Andrew; Schnorr-Müller, Allan; Storchi-Bergmann, Thaisa +2 more
We present two-dimensional gaseous kinematics of the inner 1.2 × 1.8 kpc2 of the Seyfert 2 galaxy NGC 3081, from optical spectra (5600-7000 Å) obtained with the Gemini Multi Object Spectrograph integral field spectrograph on the Gemini North telescope at a spatial resolution of ≈100 pc. We have identified two components in the line emit…
KROSS: mapping the Hα emission across the star formation sequence at z ≈ 1
Swinbank, A. M.; Magdis, Georgios E.; Bureau, Martin +7 more
We present first results from the KMOS (K-band Multi-Object Spectrograph) Redshift One Spectroscopic Survey, an ongoing large kinematical survey of a thousand, z ∼ 1 star-forming galaxies, with VLT KMOS. Out of the targeted galaxies (∼500 so far), we detect and spatially resolve Hα emission in ∼90 and 77 per cent of the sample, respectively. Based…
The mass fraction of AGN and the Fundamental Plane of black hole activity from a large X-ray-selected sample of LINERs
Best, P. N.; Nisbet, D. M.
A sample of 576 X-ray-selected LINERs was constructed by combining data from the 3XMM-DR4 and SDSS-DR7 catalogues. The sample was used to investigate the fraction of galaxies hosting a LINER, finding that the fraction is a strong function of both stellar mass and black hole mass (increasing as {f_LINER ∝ M^{1.6 ± 0.2}_{*}} and {f_LINER ∝ M^{0.6 ± …