Search Publications
Connecting HL Tau to the observed exoplanet sample
Tamayo, Daniel; Murray, Norman; Petrovich, Cristobal +2 more
The Atacama Large Millimeter/submilimeter Array (ALMA) recently revealed a set of nearly concentric gaps in the protoplanetary disc surrounding the young star HL Tauri (HL Tau). If these are carved by forming gas giants, this provides the first set of orbital initial conditions for planets as they emerge from their birth discs. Using N-body integr…
Scenarios for the dynamics of comet 67P/Churyumov-Gerasimenko over the past 500 kyr
Guzzo, Massimiliano; Lega, Elena
The complex dynamics of 67P has the typical uncertainties of the Jupiter-family comets. The Rosetta mission provided a unique opportunity to dissipate them with fresh experimental data. We aim to constrain the residence time of the comet in a dynamics dominated by Jupiter and Saturn by comparing statistics of large sets of numerical integrations w…
The cooling, mass and radius of the neutron star in EXO 0748-676 in quiescence with XMM-Newton
Costantini, Elisa; Méndez, Mariano; Cheng, Zheng +1 more
We analyse four XMM-Newton observations of the neutron-star low-mass X-ray binary EXO 0748-676 in quiescence. We fit the spectra with an absorbed neutron-star atmosphere model, without the need for a high-energy (power-law) component; with a 95 per cent confidence the power law contributes less than 1 per cent to the total flux of the source in 0.…
Adaptive PSF fitting - a highly performing photometric method and light curves of the GLS H1413+117: time delays and micro-lensing effects
Surdej, J.; Nuritdinov, S. N.; Elyiv, A. +12 more
We present new photometric observations of H1413+117 acquired during seasons between 2001 and 2008 in order to estimate the time delays between the lensed quasar images and to characterize at best the on-going micro-lensing events. We propose a highly performing photometric method called the adaptive point spread function fitting and have successf…
Environmental impacts on dust temperature of star-forming galaxies in the local Universe
Nakagawa, Takao; Takita, Satoshi; Koyama, Yusei +1 more
We present infrared views of the environmental effects on the dust properties in star-forming (SF) galaxies at z ∼ 0, using the AKARI Far-Infrared Surveyor all-sky map and the large spectroscopic galaxy sample from Sloan Digital Sky Survey (SDSS) Data Release 7 (DR7). We restrict the sample to those within the redshift range of 0.05 < z < 0.…
Complex UV/X-ray variability of 1H 0707-495
Papadakis, I. E.; Dewangan, G. C.; Pal, Main +3 more
We study the relationship between the UV and X-ray variability of the narrow-line Seyfert 1 galaxy 1H 0707-495. Using a year-long Swift monitoring and four long XMM-Newton observations, we perform cross-correlation analyses of the UV and X-ray light curves, on both long and short time-scales. We also perform time-resolved X-ray spectroscopy on 1-2…
The tilting rate of the Milky Way's disc
Debattista, Victor P.; Macciò, Andrea V.; Earp, Samuel W. F. +1 more
We present tilting rates for galaxies comparable to the Milky Way (MW) in a Λ cold dark matter cosmological hydrodynamical simulation, and compare these with the predicted tilting rate detection limit of the Gaia satellite 0.28° Gyr-1. We first identify galaxies with mass comparable to the MW (9 × 1011 ≤ M200 ≤ 1.2…
Far-infrared emission in luminous quasars accompanied by nuclear outflows
Hewett, P. C.; Dunne, L.; Dye, S. +9 more
Combining large-area optical quasar surveys with the new far-infrared (FIR) Herschel-ATLAS Data Release 1, we search for an observational signature associated with the minority of quasars possessing bright FIR luminosities. We find that FIR-bright quasars show broad C IV emission-line blueshifts in excess of that expected from the optical luminosi…
Coronal properties of the luminous radio-quiet quasar QSO B2202-209
Harrison, F. A.; Stern, D.; Behar, E. +8 more
We present an analysis of the joint XMM-Newton and NuSTAR observations of the radio-quiet quasar QSO B2202-209. Using an optical observation from the Hale Telescope at the Palomar Observatory, we revise the redshift of the source from the previously reported z = 1.77 to z = 0.532, and we estimate the mass of the central black hole, log (MBH
A counterimage to the gravitational arc in Abell 1201: Evidence for IMF variations, or a 1010 M⊙ black hole?★†
Edge, Alastair C.; Lucey, John R.; Smith, Russell J.
Abell 1201 is a massive galaxy cluster at z = 0.169 with a brightest cluster galaxy (BCG) that acts as a gravitational lens to a background source at z = 0.451. The lensing configuration is unusual, with a single bright arc formed at small radius (∼2 arcsec), where stars and dark matter are both expected to contribute substantially to the total le…