Search Publications
ALMA Resolves C I Emission from the β Pictoris Debris Disk
Roberge, Aki; Pantin, Eric; Cataldi, Gianni +8 more
The debris disk around β Pictoris is known to contain gas. Previous ALMA observations revealed a CO belt at ∼85 au with a distinct clump, interpreted as a location of enhanced gas production. Photodissociation converts CO into C and O within ∼50 a. We resolve C I emission at 492 GHz using ALMA and study its spatial distribution. C I shows the same…
Testing the relativistic Doppler boost hypothesis for supermassive black hole binary candidates
Haiman, Zoltán; Schiminovich, David; Charisi, Maria +1 more
Supermassive black hole binaries (SMBHBs) should be common in galactic nuclei as a result of frequent galaxy mergers. Recently, a large sample of sub-parsec SMBHB candidates was identified as bright periodically variable quasars in optical surveys. If the observed periodicity corresponds to the redshifted binary orbital period, the inferred orbita…
The Herschel-ATLAS Data Release 2. Paper II. Catalogs of Far-infrared and Submillimeter Sources in the Fields at the South and North Galactic Poles
Valtchanov, I.; Ivison, R. J.; de Zotti, G. +13 more
The Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS) is a survey of 660 deg2 with the PACS and SPIRE cameras in five photometric bands: 100, 160, 250, 350, and 500 µm. This is the second of three papers describing the data release for the large fields at the south and north Galactic poles (NGP and SGP). In this paper w…
A Geometrical 1% Distance to the Short-period Binary Cepheid V1334 Cygni
Nelan, E.; Mowlavi, N.; Eyer, L. +18 more
Cepheid stars play a considerable role as extragalactic distances indicators, thanks to the simple empirical relation between their pulsation period and their luminosity. They overlap with that of secondary distance indicators, such as Type Ia supernovae, whose distance scale is tied to Cepheid luminosities. However, the period-luminosity (P-L) re…
Investigating the young solar system analog HD 95086. A combined HARPS and SPHERE exploration
Avenhaus, H.; Henning, T.; Ginski, C. +56 more
Context. HD 95086 (A8V, 17 Myr) hosts a rare planetary system for which a multi-belt debris disk and a giant planet of 4-5 MJup have been directly imaged.
Aims: Our study aims to characterize the global architecture of this young system using the combination of radial velocity and direct imaging observations. We want to characteriz…
The new galaxy evolution paradigm revealed by the Herschel surveys
Ivison, R. J.; Smith, Matthew W. L.; van der Werf, Paul +22 more
The Herschel Space Observatory has revealed a very different galaxyscape from that shown by optical surveys which presents a challenge for galaxy-evolution models. The Herschel surveys reveal (1) that there was rapid galaxy evolution in the very recent past and (2) that galaxies lie on a single Galaxy Sequence (GS) rather than a star-forming 'main…
An Ultra Metal-poor Star Near the Hydrogen-burning Limit
Casey, Andrew R.; Thompson, Ian B.; Schlaufman, Kevin C.
It is unknown whether or not low-mass stars can form at low metallicity. While theoretical simulations of Population III (Pop III) star formation show that protostellar disks can fragment, it is impossible for those simulations to discern if those fragments survive as low-mass stars. We report the discovery of a low-mass star on a circular orbit w…
Internal dynamics of the Large Magellanic Cloud from Gaia DR2
Vasiliev, Eugene
We use the proper motions (PM) of half a million red giant stars in the Large Magellanic Cloud measured by Gaia to construct a 2D kinematic map of mean PM and its dispersion across the galaxy, out to 7 kpc from its centre. We then explore a range of dynamical models and measure the rotation curve, mean azimuthal velocity, velocity dispersion profi…
Galaxy structure from multiple tracers - III. Radial variations in M87's IMF
Auger, Matthew; Oldham, Lindsay
We present the first constraints on stellar mass-to-light ratio gradients in an early-type galaxy (ETG) using multiple dynamical tracer populations to model the dark and luminous mass structure simultaneously. We combine the kinematics of the central starlight, two globular cluster populations and satellite galaxies in a Jeans analysis to obtain n…
Deep JVLA Imaging of GOODS-N at 20 cm
Owen, Frazer N.
New wideband continuum observations in the 1-2 GHz band of the GOODS-N field using NSF’s Karl G. Jansky Very Large Array (VLA) are presented. The best image with an effective frequency of 1525 MHz reaches an rms noise in the field center of 2.2 µJy, with 1.″6 resolution. A catalog of 795 sources is presented covering a radius of 9 arcminutes…