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Understanding Compact Object Formation and Natal Kicks. III. The case of Cygnus X-1
Understanding Compact Object Formation Natal Kicks Cygnus X-1
2011/10/20
In recent years, accurate observational constraints become available for an increasing number of Galactic X-ray binaries. Together with proper motion measurements, we could reconstruct the full evolut...
Giant Planet Formation by Disk Instability in Low Mass Disks?
Giant Planet Formation Disk Instability Low Mass Disks
2011/1/11
Forming giant planets by disk instability requires a gaseous disk that is massive enough to become gravitationally unstable and able to cool fast enough for self-gravitating clumps to form and survive...
The role of the initial surface density profiles of the disc on giant planet formation: comparing with observations
the initial surface density profiles the disc on giant planet formation
2011/1/10
In order to explain the main characteristics of the observed population of extrasolar planets and the giant planets in the Solar System, we need to get a clear understanding of which are the initial c...
Large-Scale Gas Dynamics in the Adhesion Model: Implications for the Two-Phase Massive Galaxy Formation Scenario
the Adhesion Model Implications the Two-Phase Massive Galaxy Formation Scenario
2011/1/13
The mass assembly and star formation histories of massive galaxies identified at low redshift z in different cosmological hydrodynamical simulations, have been studied through a detailed follow-up ba...
Formation of Accretion Disks in Close-Binary Systems with Magnetic Fields
Accretion Disks Close-Binary Systems Magnetic Fields
2011/1/10
We have developed a three-dimensional numerical model and applied it to simulate plasma flows in semi-detached binary systems whose accretor possesses a strong intrinsic magnetic field. The model is b...
Formation of the black-hole binary M33 X-7 via mass-exchange in a tight massive system
the black-hole binary M33 X-7 via mass-exchange
2011/1/10
M33 X-7 is among the most massive X-Ray binary stellar systems known, hosting a rapidly spinning 15.65 Msun black hole orbiting an underluminous 70 Msun Main Sequence companion in a slightly eccentric...
High-resolution simulations of planetesimal formation in turbulent protoplanetary discs
High-resolution simulations turbulent protoplanetary discs
2011/1/10
We present high-resolution computer simulations of dust dynamics and planetesimal formation in turbulence generated by the magnetorotational instability. We show that the turbulent viscosity associate...
Black Hole Formation in Failing Core-Collapse Supernovae
Black Hole Formation Core-Collapse Supernovae
2011/1/11
We present results of a systematic study of failing core-collapse supernovae and the formation of stellar-mass black holes (BHs). Using our open-source general-relativistic 1.5D code GR1D equipped wit...
The HII region G35.673-00.847: another case of triggered star formation?
The HII region G35.673-00.847 triggered star formation
2011/1/11
As part of a systematic study that we are performing with the aim to increase the observational evidence of triggered star formation in the surroundings of HII regions, we analyze the ISM around the H...
The Interplay of Magnetic Fields, Fragmentation and Ionization Feedback in High-Mass Star Formation
Magnetic Fields Fragmentation High-Mass Star Formation
2011/1/13
Massive stars disproportionately influence their surroundings. How they form has only started to become clear recently through radiation gas dynamical simulations. However, until now, no simulation ha...
The H-alpha Luminosity Function and Star-Formation Rate Volume Density at z=0.8 from the NEWFIRM H-alpha Survey
galaxies photometry — galaxies emission lines — galaxies distances and redshifts — galaxies
2010/11/15
We present new measurements of the H luminosity function (LF) and star-formation rate (SFR)
volume density for galaxies at z ∼ 0.8. Our analysis is based on 1.18μm narrowband data from
the NE...
Scalar models for the generalized Chaplygin gas and the structure formation constraints
Scalar models generalized Chaplygin gas structure formation constraints
2010/11/9
The generalized Chaplygin gas model represents a tentative to unify dark matter and dark
energy. It is characterized by a fluid with an equation of state p = −A/ . It can be obtained from a ge...
Studies of Stellar Collapse and Black Hole Formation with the Open-Source Code GR1D
stellar collapse neutron stars black holes supernovae
2010/11/9
We discuss results from simulations of black hole formation in failing core-collapse
supernovae performed with the code GR1D, a new open-source Eulerian spherically-symmetric
general-relativistic hy...
A simple connection between the near- and mid-infrared emission of galaxies and their star-formation rates
the near- and mid-infrared emission galaxies
2011/1/10
We have measured the near-infrared colors and the fluxes of individual pixels in 68 galaxies common to the Spitzer Infrared Nearby Galaxies Survey and the Large Galaxy Atlas Survey. Each galaxy was se...
ACCESS III: The Nature of Star Formation in the Shapley Supercluster
Star Formation the Shapley Supercluster
2011/1/10
We present a joint analysis of panoramic Spitzer/MIPS mid-infrared and GALEX ultraviolet imaging of the Shapley supercluster at z=0.048. Combining this with spectra of 814 supercluster members and 1.4...