Search Publications
The Herschel-ATLAS: a sample of 500 µm-selected lensed galaxies over 600 deg2
Ivison, R. J.; Omont, A.; Danese, L. +43 more
We present a sample of 80 candidate strongly lensed galaxies with flux density above 100 mJy at 500 µm extracted from the Herschel Astrophysical Terahertz Large Area Survey, over an area of 600 deg2. Available imaging and spectroscopic data allow us to confirm the strong lensing in 20 cases and to reject it in one case. For other …
Structure of Herbig AeBe disks at the milliarcsecond scale . A statistical survey in the H band using PIONIER-VLTI
Pinte, C.; Ménard, F.; Absil, O. +26 more
Context. It is now generally accepted that the near-infrared excess of Herbig AeBe stars originates in the dust of a circumstellar disk.
Aims: The aims of this article are to infer the radial and vertical structure of these disks at scales of order 1 au, and the properties of the dust grains.
Methods: The program objects (51 in total) we…
Hitomi Constraints on the 3.5 keV Line in the Perseus Galaxy Cluster
Mukai, K.; Yamaguchi, H.; Koyama, K. +215 more
High-resolution X-ray spectroscopy with Hitomi was expected to resolve the origin of the faint unidentified E≈ 3.5 {keV} emission line reported in several low-resolution studies of various massive systems, such as galaxies and clusters, including the Perseus cluster. We have analyzed the Hitomi first-light observation of the Perseus cluster. The e…
Global Energetics of Solar Flares. V. Energy Closure in Flares and Coronal Mass Ejections
Xu, Yan; Jing, Ju; Warren, Harry P. +11 more
In this study we synthesize the results of four previous studies on the global energetics of solar flares and associated coronal mass ejections (CMEs), which include magnetic, thermal, nonthermal, and CME energies in 399 solar M- and X-class flare events observed during the first 3.5 yr of the Solar Dynamics Observatory (SDO) mission. Our findings…
The composition of cometary ices
Biver, N.; Bockelée-Morvan, D.
The chemical composition of cometary ices provides clues for the conditions of formation and evolution of the early Solar System. A large number of molecules have been identified in cometary atmospheres, from both ground-based observations and space, including in situ investigations. This includes large organic molecules, which are also observed i…
The Distance to NGC 4993: The Host Galaxy of the Gravitational-wave Event GW170817
Gall, Christa; Hjorth, Jens; Tanvir, Nial R. +6 more
The historic detection of gravitational waves from a binary neutron star merger (GW170817) and its electromagnetic counterpart led to the first accurate (sub-arcsecond) localization of a gravitational-wave event. The transient was found to be ∼10″ from the nucleus of the S0 galaxy NGC 4993. We report here the luminosity distance to this galaxy usi…
Selection of the InSight Landing Site
Golombek, M.; Charalambous, C.; Piqueux, S. +32 more
The selection of the Discovery Program InSight landing site took over four years from initial identification of possible areas that met engineering constraints, to downselection via targeted data from orbiters (especially Mars Reconnaissance Orbiter (MRO) Context Camera (CTX) and High-Resolution Imaging Science Experiment (HiRISE) images), to sele…
Stellar inventory of the solar neighbourhood using Gaia DR1
Bovy, Jo
The absolute number and the density profiles of different types of stars in the solar neighbourhood are a fundamental anchor for studies of the initial mass function, stellar evolution, and Galactic structure. Using data from Gaia DR1, we reconstruct Gaia's selection function and determine Gaia's volume completeness, the local number density, and …
Placing the Spotted T Tauri Star LkCa 4 on an HR Diagram
Herczeg, Gregory J.; Jose, Jessy; Liu, Chun-Fan +12 more
Ages and masses of young stars are often estimated by comparing their luminosities and effective temperatures to pre-main-sequence stellar evolution tracks, but magnetic fields and starspots complicate both the observations and evolution. To understand their influence, we study the heavily spotted weak-lined T-Tauri star LkCa 4 by searching for sp…
Calibrating Star Formation in WISE Using Total Infrared Luminosity
Dale, D. A.; Smith, J. -D. T.; Brown, M. J. I. +3 more
We present accurate resolved WISE photometry of galaxies in the combined SINGS and KINGFISH sample. The luminosities in the W3 12 µm and W4 23 µm bands are calibrated to star formation rates (SFRs) derived using the total infrared luminosity, avoiding UV/optical uncertainties due to dust extinction corrections. The W3 relation has a 1σ…