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Star-formation rates of two GRB host galaxies at z ∼ 2 and a [C II] deficit observed with ALMA
Hashimoto, Tetsuya; Goto, Tomotsugu; Kim, Seong Jin +6 more
The event rate of long gamma-ray bursts (GRBs) is expected to be a useful tracer of cosmic star-formation history. For this purpose, it is necessary to understand what kinds of star formation/galaxies are traced by GRBs. Here we report rest-frame far-infrared (FIR) continuum detections of the GRB 070521 and 080207 host galaxies at z ∼ 2 with Ataca…
Molecular gas content of shell galaxies
Duc, P. -A.; Combes, F.; Mancillas, B.
Shells are fine stellar structures that are identified by their arc-like shapes around a galaxy. They are currently thought to be vestiges of galaxy interactions and/or mergers. The study of their number, geometry, stellar populations, and gas content can help us to derive the interaction or merger history of a galaxy. Numerical simulations have p…
Extension of an Empirical Electron Flux Model From 6 to 20 Earth Radii Using Cluster/RAPID Observations
Taylor, M. G. G. T.; Henderson, M. G.; Rodriguez, J. V. +1 more
An existing empirical model of the electron fluxes at geosynchronous orbit is extended radially outward in the equatorial plane to 6-20 Earth radii (RE) using observations from the Research with Adaptive Particle Imaging Detectors (RAPID) instrument on the Cluster spacecraft. The new model provides electron flux predictions in the energ…
Discovery of a Damped Lyα System in a Low-z Galaxy Group: Possible Evidence for Gas Inflow and Nuclear Star Formation
Heckman, Timothy M.; Tumlinson, Jason; Momjian, Emmanuel +3 more
We present a low-redshift (z = 0.029) damped Lyα (DLA) system in the spectrum of a background quasi-stellar object (QSO). The DLA is associated with an interacting galaxy pair within a galaxy group. We detected weak Lyα emission centered at the absorption trough of the DLA. The emission was likely tracing the neutral H I reservoir around the galax…
XMMU J181227.8-181234: a new ultracompact X-ray binary candidate
in't Zand, J. J. M.; Kuulkers, E.; Keek, L. +3 more
We report the discovery of Type I (thermonuclear) X-ray bursts from the transient source XMMU J181227.8-181234 = XTE J1812-182. We found seven X-ray bursts in Rossi X-ray Timing Explorer observations during the 2008 outburst, confirming the source as a neutron star low-mass X-ray binary. Based on the measured burst fluence and the average recurren…
Not gone with the wind: Planet occurrence is independent of stellar galactocentric velocity
Kipping, David M.; McTier, Moiya A. S.
We demonstrate that planet occurrence does not depend on stellar galactocentric velocity in the Solar neighbourhood. Using Gaia DR2 astrometry and radial velocity data, we calculate 3D galactocentric velocities for 197 090 Kepler field stars, 1647 of which are confirmed planet hosts. When we compare the galactocentric velocities of planet hosts to…
Optical properties of amorphous carbon dust around C-stars: new constraints from 2MASS and Gaia observations
Nanni, Ambra
In this work the optical properties of amorphous carbon (amC) dust condensed around carbon(C)-stars are constrained by comparing the observations for the Large Magellanic Cloud C-stars from the Two Micron All Sky Survey (2MASS) and from the Gaia data release 2 (DR2) with the synthetic photometry obtained by computing dust growth and radiative tran…
Discovery of a strong ionized-gas outflow in an AKARI-selected ultra-luminous infrared galaxy at z = 0.5
Yamamura, Issei; Noda, Hirofumi; Kokubo, Mitsuru +5 more
In order to construct a sample of ultra-luminous infrared galaxies (ULIRGs; with infrared luminosity LIR > 1012 L_{⊙}) at 0.5 < z < 1, we are conducting an optical follow-up program for bright 90 µm far-infrared sources with a faint optical (i < 20 mag) counterpart selected in the AKARI Far-Infrared Surveyor…
Inversion of HIPPARCOS and Gaia photometric data for asteroids. Asteroid rotational properties from sparse photometric data
Tanga, P.; Cellino, A.; Hestroffer, D. +2 more
Context. Sparse photometric data can be used to determine the spin properties and infer information about the shapes of asteroids. The algorithm adopted for the inversion of Gaia photometric data assumes, for the sake of simplicity and to minimize CPU execution time, that the objects have triaxial ellipsoid shapes. In the past, this algorithm was …
NGC 1261: A Time-Series VI Study of its Variable Stars
Arellano Ferro, A.; Calderón, J. H.; Bustos Fierro, I. H. +1 more
Time-series VI CCD photometry of the globular cluster NGC 1261 is employed to study its variable star population. A membership analysis of most variables based on Gaia DR2 proper motions and colours was performed prior to the estimation of the mean cluster distance and metallicity. The light curves of the member RR Lyrae were Fourier decomposed to…