We present a model for the formation of high-mass close binary systems in the context of forming massive stars through gas accretion in the centres of stellar clusters. A low-mass wide binary evolves under mass accretion towards a high-mass close binary, attaining system masses of order 30-50 M⊙at separations of order 1 AU. The resulting high frequency of binary systems with two massive compone...

Recent photometric studies have shown that early-type galaxies at fixed stellar mass were smaller and denser at earlier times. In this Letter, we assess that finding by deriving the dynamical mass of such a compact quiescent galaxy at z = 1.8. We have obtained a high-quality spectrum with full UV–NIR wavelength coverage of galaxy NMBS-C7447 using X-Shooter on the Very Large Telescope. We determ...

We study the evolution of the global stellar mass density in a Λ cold dark matter (CDM) universe using two different types of hydrodynamical simulations (Eulerian TVD and SPH) and the analytical model of Hernquist & Springel (2003). We find that the theoretical calculations all predict both a higher stellar mass density at z ∼ 3 than indicated by current observations, and that the peak of the c...

Recent observations show a strong correlation between stellar mass and accretion rate in young stellar and sub-stellar objects, with the scaling Ṁacc ∝ M 2 ∗ holding over more than four orders of magnitude in accretion rate. We explore the consequences of this correlation in the context of disk evolution models. We note that such a correlation is not expected to arise from variations in disk an...

Upcoming missions, including the James Webb Space Telescope, will soon characterize atmospheres of terrestrial-type exoplanets in habitable zones around cool K- and M-type stars by searching for atmospheric biosignatures. Recent observations suggest that ionizing radiation particle environment from active planet hosts may be detrimental to exoplanetary habitability. Since no direct information ...

The properties of the stellar populations in a galaxy are known to correlate with amount and distribution mass. We take advantage maps light-weighted mean age Agewr metallicity Z*wr for sample 362 galaxies from integral-field spectroscopic survey CALIFA (summing up >600,000 individual regions approximately 1 kpc linear size), produced our previous works, investigate how these local react stella...

We have measured star formation histories (SFHs) and stellar masses of galaxies detected by the Balloon-borne Large Aperture Submillimetre Telescope (BLAST) over∼9 deg2 centred on the Chandra Deep Field-South. We have applied the recently developed SFH reconstruction method of Dye et al. to optical, near-infrared and mid-infrared photometry of 92 BLAST galaxies. We find significant differences ...

ABSTRACT When gravitational waves (GWs) pass through the nuclear star clusters of galactic lenses, they may be microlensed by stars. Such microlensing can cause potentially observable beating patterns on waveform due to superposition and magnify signal. On one hand, magnification could lead first detection a GW. other introduces systematic error in strong lensing use-cases, such as localization...