Search Publications
The STAGGER-grid: A grid of 3D stellar atmosphere models. V. Synthetic stellar spectra and broad-band photometry
Thévenin, F.; Chiavassa, A.; Asplund, M. +4 more
Context. The surface structures and dynamics of cool stars are characterised by the presence of convective motions and turbulent flows which shape the emergent spectrum.
Aims: We used realistic three-dimensional (3D) radiative hydrodynamical simulations from the STAGGER-grid to calculate synthetic spectra with the radiative transfer code OPTI…
Eddington-limited Accretion in z ∼ 2 WISE-selected Hot, Dust-obscured Galaxies
Tsai, Chao-Wei; Wright, Edward L.; Jun, Hyunsung D. +12 more
Hot, dust-obscured galaxies, or “Hot DOGs,” are a rare, dusty, hyperluminous galaxy population discovered by the WISE mission. Predominantly at redshifts 2-3, they include the most luminous known galaxies in the universe. Their high luminosities likely come from accretion onto highly obscured supermassive black holes (SMBHs). We have conducted a p…
Dust attenuation and Hα emission in a sample of galaxies observed with Herschel at 0.6 < z < 1.6
Shirley, R.; Buat, V.; Boquien, M. +5 more
Context. Dust attenuation shapes the spectral energy distribution of galaxies. It is particularly true for dusty galaxies in which stars experience a heavy attenuation. The combination of UV to IR photometry with the spectroscopic measurement of the Hα recombination line helps to quantify dust attenuation of the whole stellar population and its wa…
Observations of fast-moving features in the debris disk of AU Mic on a three-year timescale: Confirmation and new discoveries
Ménard, F.; Avenhaus, H.; Augereau, J. -C. +62 more
Context. The nearby and young M star AU Mic is surrounded by a debris disk in which we previously identified a series of large-scale arch-like structures that have never been seen before in any other debris disk and that move outward at high velocities.
Aims: We initiated a monitoring program with the following objectives: (1) track the locat…
A Foreground Masking Strategy for [C II] Intensity Mapping Experiments Using Galaxies Selected by Stellar Mass and Redshift
Bock, J.; Zemcov, M.; Cooray, A. R. +11 more
Intensity mapping provides a unique means to probe the epoch of reionization (EoR), when the neutral intergalactic medium was ionized by energetic photons emitted from the first galaxies. The [C II] 158 µm fine-structure line is typically one of the brightest emission lines of star-forming galaxies and thus a promising tracer of the global E…
Binary Pulsar Distances and Velocities from Gaia Data Release 2
Deller, Adam T.; Kaplan, David L.; Chatterjee, Shami +2 more
The second data release from the Gaia mission (Gaia DR2) includes, among its billion entries, astrometric parameters for binary companions to a number of known pulsars, including white dwarf companions to millisecond pulsars (MSPs) and the non-degenerate components of so-called “black widow” and “redback” systems. We find 22 such counterparts in D…
Evidence of a Non-universal Stellar Initial Mass Function. Insights from HST Optical Imaging of Six Ultra-faint Dwarf Milky Way Satellites
Brown, Thomas M.; Gennaro, Mario; Geha, Marla +9 more
Using deep observations obtained with the Advanced Camera for Surveys (ACS) on board the Hubble Space Telescope (HST), we demonstrate that the sub-solar stellar initial mass function (IMF) of six ultra-faint dwarf Milky Way satellites (UFDs) is more bottom light than the IMF of the Milky Way disk. Our data have a lower-mass limit of ∼0.45 M ⊙…
The delay time distribution of tidal disruption flares
Stone, Nicholas C.; Vasiliev, Eugene; Metzger, Brian D. +1 more
Recent observations suggest that stellar tidal disruption events (TDEs) are strongly overrepresented in rare, post-starburst galaxies. Several dynamical mechanisms have been proposed to elevate their TDE rates, ranging from central stellar overdensities to the presence of supermassive black hole (SMBH) binaries. Another such mechanism, introduced …
SCExAO/CHARIS Near-infrared Direct Imaging, Spectroscopy, and Forward-Modeling of κ And b: A Likely Young, Low-gravity Superjovian Companion
Currie, Thayne; Nielsen, Eric L.; Kwon, Jungmi +30 more
We present SCExAO/CHARIS high-contrast imaging/JHK integral field spectroscopy of κ And b, a directly imaged low-mass companion orbiting a nearby B9V star. We detect κ And b at a high signal-to-noise ratio and extract high-precision spectrophotometry using a new forward-modeling algorithm for (A-)LOCI complementary to KLIP-FM developed by Pueyo et…
The Infrared Emission and Opening Angle of the Torus in Quasars
Ho, Luis C.; Zhuang, Ming-Yang; Shangguan, Jinyi
According to the unified model of active galactic nuclei (AGNs), a putative dusty torus plays an important role in determining an AGN’s external appearance. However, information on the physical properties of the torus is very scarce. We perform detailed decomposition of the infrared (1-500 µm) spectral energy distribution of 76 z < 0.5 Pa…