Search Publications
Warm FIRE: simulating galaxy formation with resonant sterile neutrino dark matter
Faucher-Giguère, Claude-André; Hopkins, Philip F.; Wetzel, Andrew +8 more
We study the impact of a warm dark matter (WDM) cosmology on dwarf galaxy formation through a suite of cosmological hydrodynamical zoom-in simulations of M_halo ≈ 10^{10} M_{⊙} dark matter haloes as part of the Feedback in Realistic Environments (FIRE) project. A main focus of this paper is to evaluate the combined effects of dark matter physics a…
Host galaxies of high-redshift extremely red and obscured quasars
Brandt, W. N.; Ross, Nicholas P.; Strauss, Michael A. +9 more
We present Hubble Space Telescope 1.4-1.6 µm images of the hosts of 10 extremely red quasars (ERQs) and six type 2 quasar candidates at z = 2-3. ERQs, whose bolometric luminosities range between 1047 and 1048 erg s-1, show spectroscopic signs of powerful ionized winds, whereas type 2 quasar candidates are les…
Spectral variations of Lyman α emission within strongly lensed sources observed with MUSE
Richard, J.; Verhamme, A.; Clément, B. +13 more
We present an analysis of H I Lyman α emission in deep VLT/MUSE observations of two highly magnified and extended galaxies at z=3.5 and 4.03, including a newly discovered, almost complete Einstein ring. While these Lyman α haloes are intrinsically similar to the ones typically seen in other MUSE deep fields, the benefits of gravitational lensing a…
Probing the origin of stellar flares on M dwarfs using TESS data sectors 1-3
Doyle, J. G.; Ramsay, G.; Wu, K. +1 more
Detailed studies of the Sun have shown that sunspots and solar flares are closely correlated. Photometric data from Kepler/K2 has allowed similar studies to be carried out on other stars. Here, we utilize Transiting Exoplanet Survey Satellite (TESS) photometric 2-min cadence of 167 low-mass stars from Sectors 1 to 3 to investigate the relationship…
Overcast on Osiris: 3D radiative-hydrodynamical simulations of a cloudy hot Jupiter using the parametrized, phase-equilibrium cloud formation code EDDYSED
Sing, D. K.; Mikal-Evans, T.; Mayne, N. J. +5 more
We present results from 3D radiative-hydrodynamical simulations of HD 209458b with a fully coupled treatment of clouds using the EDDYSED code, critically, including cloud radiative feedback via absorption and scattering. We demonstrate that the thermal and optical structure of the simulated atmosphere is markedly different, for the majority of our…
Systematic errors in Gaia DR2 astrometry and their impact on measurements of internal kinematics of star clusters
Vasiliev, Eugene
We use stellar proper motions (PM) from Gaia Data Release 2 for studying the internal kinematics of Milky Way globular clusters. In addition to statistical measurement errors, there are significant spatially correlated systematic errors, which cannot be ignored when studying the internal kinematics. We develop a mathematically consistent procedure…
Signatures of an eccentric disc cavity: Dust and gas in IRS 48
Pinte, Christophe; Christiaens, Valentin; van der Marel, Nienke +5 more
We test the hypothesis that the disc cavity in the `transition disc' Oph IRS 48 is carved by an unseen binary companion. We use 3D dust-gas smoothed-particle hydrodynamics simulations to demonstrate that marginally coupled dust grains concentrate in the gas overdensity that forms in the cavity around a low binary mass ratio binary. This produces h…
WISDOM project - V. Resolving molecular gas in Keplerian rotation around the supermassive black hole in NGC 0383
Williams, Thomas G.; Sarzi, Marc; Cappellari, Michele +7 more
As part of the mm-Wave Interferometric Survey of Dark Object Masses (WISDOM), we present a measurement of the mass of the supermassive black hole (SMBH) in the nearby early-type galaxy NGC 0383 (radio source 3C 031). This measurement is based on Atacama Large Millimeter/sub-millimeter Array (ALMA) cycle 4 and 5 observations of the 12CO(…
Dramatic spectral transition of X-ray pulsar GX 304-1 in low luminous state
Doroshenko, Victor; Tsygankov, Sergey S.; Mushtukov, Alexander A. +5 more
We report on the discovery of a dramatic change in the energy spectrum of the X-ray pulsar GX 304-1 appearing at low luminosity. Particularly, we found that the cut-off power-law spectrum typical for accreting pulsars, including GX 304-1 at higher luminosities of LX ∼ 1036-1037 erg s-1, transformed at lo…
Torus model properties of an ultra-hard X-ray selected sample of Seyfert galaxies
Hernán-Caballero, A.; Carrera, F. J.; Acosta-Pulido, J. A. +15 more
We characterize for the first time the torus properties of an ultra-hard X-ray (14-195 keV) volume-limited (DL < 40 Mpc) sample of 24 Seyfert (Sy) galaxies (BCS40 sample). The sample was selected from the Swift/BAT nine-month catalogue. We use high angular resolution nuclear infrared (IR) photometry and N-band spectroscopy…