Search Publications
Galaxy Zoo: Mergers - Dynamical models of interacting galaxies
Keel, William C.; Parrish, Michael; Smith, Arfon M. +6 more
The dynamical history of most merging galaxies is not well understood. Correlations between galaxy interaction and star formation have been found in previous studies, but require the context of the physical history of merging systems for full insight into the processes that lead to enhanced star formation. We present the results of simulations tha…
H-ATLAS: a candidate high redshift cluster/protocluster of star-forming galaxies
Pérez-Fournon, I.; Valtchanov, I.; Ivison, R. J. +33 more
We investigate the region around the Planck-detected z = 3.26 gravitationally lensed galaxy HATLAS J114637.9-001132 (hereinafter HATLAS12-00) using both archival Herschel data from the H-ATLAS survey and using submm data obtained with both LABOCA and SCUBA2. The lensed source is found to be surrounded by a strong overdensity of both Herschel-SPIRE…
Gas outflow and dust transport of comet 67P/Churyumov-Gerasimenko
Bertaux, Jean-Loup; Da Deppo, Vania; Naletto, Giampiero +46 more
Because of the diurnal thermal cycle and the irregular shape of the nucleus, gas outflow of comet 67P/Churyumov-Gerasimenko could be highly anisotropic as indicated by the colliminated dust jet structures on the sunlit side. Based on the OSIRIS imaging observations of the outgassing effect, a simple model of surface sublimation can be constructed …
A possible Chandra and Hubble Space Telescope detection of extragalactic WHIM towards PG 1116+215
Bonamente, M.; Tempel, E.; Nevalainen, J. +4 more
We have analysed Chandra low energy transmission grating and XMM-Newton Reflection Grating Spectrometer (RGS) spectra towards the z = 0.177 quasar PG 1116+215, a sightline that is rendered particularly interesting by the Hubble Space Telescope (HST) detection of several O VI and H I broad Lyman α absorption (BLA) lines that may be associated with …
SWIFT view of the 2015 outburst of GS 2023+338 (V404 Cyg): complex evolution of spectral and temporal characteristics
Nandi, A.; Mandal, S.; Agrawal, V. K. +1 more
We study the spectral and temporal characteristics of the source GS 2023+338 (V404 Cyg) during the initial phase of its 2015 June outburst, over the energy range of 0.5-150 keV. This is the first detailed study of the characteristics of this source based on SWIFT observations, being reported. Based on our analysis, we understand that the source ex…
Studying the evolution of AGB stars in the Gaia epoch
Di Criscienzo, M.; Dell'Agli, F.; Ventura, P. +6 more
We present asymptotic giant branch (AGB) models of solar metallicity, to allow the interpretation of observations of Galactic AGB stars, whose distances should be soon available after the first release of the Gaia catalogue. We find an abrupt change in the AGB physical and chemical properties, occurring at the threshold mass to ignite hot bottom b…
Giant scattering cones in obscured quasars
Zakamska, Nadia L.; Wylezalek, Dominika; Obied, Georges +1 more
We analyse Hubble Space Telescope observations of scattering regions in 20 luminous obscured quasars at 0.24 < z < 0.65 (11 new observations and nine archival ones) observed at rest frame ∼3000 Å. We find spectacular 5-10 kpc-scale scattering regions in almost all cases. The median scattering efficiency at this wavelength (the ratio of obser…
Updated measurements of the dark matter halo masses of obscured quasars with improved WISE and Planck data
Hickox, R. C.; DiPompeo, M. A.; Myers, A. D.
Using the most recent releases of WISE and Planck data, we perform updated measurements of the bias and typical dark matter halo mass of infrared (IR)-selected obscured and unobscured quasars, using the angular autocorrelation function and cosmic microwave background lensing cross-correlations. Since our recent work of this kind, the WISE ALLWISE …
Local SDSS galaxies in the Herschel Stripe 82 survey: a critical assessment of optically derived star formation rates
Lutz, D.; Trump, J. R.; Mendel, J. T. +2 more
We study a set of 3319 galaxies in the redshift interval 0.04 < z < 0.15 with far-infrared (FIR) coverage from the Herschel Stripe 82 survey (HerS), and emission-line measurements, redshifts, stellar masses and star formation rates (SFRs) from the Sloan Digital Sky Survey (SDSS) (DR7) MPA/JHU data base. About 40 per cent of the sample are de…
Soft γ-ray selected radio galaxies: favouring giant size discovery
Venturi, T.; Dallacasa, D.; Ubertini, P. +5 more
Using the recent INTEGRAL/IBIS and Swift/BAT surveys we have extracted a sample of 64 confirmed plus three candidate radio galaxies selected in the soft gamma-ray band. The sample covers all optical classes and is dominated by objects showing a Fanaroff-Riley type II radio morphology; a large fraction (70 per cent) of the sample is made of `radiat…