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Danail Obreschkow

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Publications associées (37)

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A virtual sky with extragalactic HI and CO lines for the Square Kilometre Array (SKA) and the Atacama Large Millimeter/submillimeter Array (ALMA)

Danail Obreschkow

We present a sky simulation of the atomic HI-emission line and the first 10 rotational CO emission lines of molecular gas in galaxies beyond the Milky Way. The simulated sky field has a comoving diameter of 500 Mpc/h; hence, the actual field-of-view depend ...

American Astronomical Society2009

Prediction of the cosmic evolution of the CO-luminosity functions

Danail Obreschkow

We predict the emission line luminosity functions (LFs) of the first 10 rotational transitions of CO in galaxies at redshift z=0 to z=10. This prediction relies on a recently presented simulation of the molecular cold gas content 3x10^7 evolving galaxies b ...

American Astronomical Society2009

Understanding the H2/HI ratio in galaxies

Danail Obreschkow

We revisit the mass ratio R between molecular hydrogen (H2) and atomic hydrogen (HI) in different galaxies from a phenomenological and theoretical viewpoint. First, the local H2 mass function (MF) is estimated from the local CO luminosity function (LF) of ...

Wiley-Blackwell2009

Simulation of the cosmic evolution of atomic and molecular hydrogen in galaxies

Danail Obreschkow

We present a simulation of the cosmic evolution of the atomic and molecular phases of the cold hydrogen gas in about 3x10^7 galaxies, obtained by postprocessing the virtual galaxy catalog produced by De Lucia & Blaizot on the Millennium Simulation of cosmi ...

American Astronomical Society2009

The cosmic decline in the H2/HI ratio in galaxies

Danail Obreschkow

We use a pressure-based model for splitting cold hydrogen into its atomic (HI) and molecular (H2) components to tackle the co-evolution of HI, H2, and star formation rates (SFR) in 3x10^7 simulated galaxies in the Millennium simulation. The main prediction ...

2009

The Cosmic Evolution of Atomic and Molecular Hydrogen in Galaxies

Danail Obreschkow

Neutral atomic hydrogen (HI) and molecular hydrogen (H2) play a primordial role in the cosmic evolution of galaxies. However, little is known about the co-evolution of these two gas phases. This discrepancy and the design of future telescopes like the SKA ...

University of Oxford2009

Mapping the SKA Simulated Skies with the S3-Tools

Danail Obreschkow

The S3-Tools are a set of Python-based routines and interfaces whose purpose is to provide user-friendly access to the SKA Simulated Skies (S3) set of simulations, an effort led by the University of Oxford in the framework of the European Union's SKADS pro ...

2009

A semi-empirical simulation of the extragalactic radio continuum sky for next generation radio telescopes

Danail Obreschkow

We have developed a semi-empirical simulation of the extragalactic radio continuum sky suitable for aiding the design of next generation radio interferometers such as the Square Kilometre Array (SKA). The emphasis is on modelling the large-scale cosmologic ...

Wiley-Blackwell2008

Neutral hydrogen in the local universe

Danail Obreschkow

We revisit the composition of neutral hydrogen, i.e. atomic (HI) and molecular (H2), in the local Universe, with focus on the H2-to-HI mass ratio R in various galaxies and the H2-mass function (MF). First, we derive the H2-MF from the CO-luminosity functio ...

Amer Inst Physics, 2 Huntington Quadrangle, Ste 1No1 D, Melville, Ny 11747-4501 Usa2008

Direct effects of gravity on cavitation bubble collapse

Mohamed Farhat, Nicolas Dorsaz, Danail Obreschkow, Philipp Kobel, Aurèle De Bosset

We propose an experiment for studying the final stages of collapse of a single laser generated cavitation bubble in microgravity. Unlike previous investigations, the goal of the study is to examine the direct effects of gravity on the cavity collapse. In t ...

2007