Search Results - "Romeo, Alessandro"

From massive spirals to dwarf irregulars: a new set of tight scaling relations for cold gas and stars driven by disc gravitational instability by Romeo, Alessandro B

“…ABSTRACT We present a new set of galaxy scaling relations for the relative mass content of atomic gas, molecular gas, and stars. Such relations are driven by…”
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A simple and accurate approximation for the Q stability parameter in multicomponent and realistically thick discs by Romeo, Alessandro B., Falstad, Niklas

“…In this paper, we propose a Q stability parameter that is more realistic than those commonly used, and is easy to evaluate (see equation 19). Using our…”
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The specific angular momentum of disc galaxies and its connection with galaxy morphology, bar structure, and disc gravitational instability by Romeo, Alessandro B, Agertz, Oscar, Renaud, Florent

“…ABSTRACT The specific angular momenta (j ≡ J/M) of stars (j⋆), gas (jgas), baryons as a whole (jb) and dark matter haloes (jh) contain clues of vital…”
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From giant clumps to clouds – I. The impact of gas fraction evolution on the stability of galactic discs by Renaud, Florent, Romeo, Alessandro B, Agertz, Oscar

“…ABSTRACT The morphology of gas-rich disc galaxies at redshift $\sim 1\!-\!3$ is dominated by a few massive clumps. The process of formation or assembly of…”
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CdTe-Based Thin Film Solar Cells: Past, Present and Future by Romeo, Alessandro, Artegiani, Elisa

“…CdTe is a very robust and chemically stable material and for this reason its related solar cell thin film photovoltaic technology is now the only thin film…”
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From lenticulars to blue compact dwarfs: the stellar mass fraction is regulated by disc gravitational instability by Romeo, Alessandro B, Agertz, Oscar, Renaud, Florent

“…ABSTRACT The stellar-to-halo mass relation (SHMR) is not only one of the main sources of information we have on the connection between galaxies and their dark…”
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From giant clumps to clouds – III. The connection between star formation and turbulence in the ISM by Ejdetjärn, Timmy, Agertz, Oscar, Östlin, Göran, Renaud, Florent, Romeo, Alessandro B

“…ABSTRACT Supersonic gas turbulence is a ubiquitous property of the interstellar medium. The level of turbulence, quantified by the gas velocity dispersion…”
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What drives gravitational instability in nearby star-forming spirals? The impact of CO and HI velocity dispersions by Romeo, Alessandro, Mogotsi, Keoikantse Moses

“…The velocity dispersion of cold interstellar gas, σ, is one of the quantities that most radically affect the onset of gravitational instabilities in galaxy…”
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Physical properties and scaling relations of molecular clouds: the effect of stellar feedback by Grisdale, Kearn, Agertz, Oscar, Renaud, Florent, Romeo, Alessandro B

“…Using hydrodynamical simulations of entire galactic discs similar to the Milky Way (MW), reaching 4.6 pc resolution, we study the origins of observed physical…”
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Larson's scaling laws, and the gravitational instability of clumpy discs at high redshift by Romeo, Alessandro B., Agertz, Oscar

“…Gravitational instabilities play a primary role in shaping the clumpy structure and powering the star formation activity of gas-rich high-redshift galaxies…”
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What powers the starburst activity of NGC 1068? Star-driven gravitational instabilities caught in the act by Romeo, Alessandro B., Fathi, Kambiz

“…We explore the role that gravitational instability plays in NGC 1068, a nearby Seyfert galaxy that exhibits unusually vigorous starburst activity. For this…”
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The impact of stellar feedback on the density and velocity structure of the interstellar medium by Grisdale, Kearn, Agertz, Oscar, Romeo, Alessandro B., Renaud, Florent, Read, Justin I.

“…We study the impact of stellar feedback in shaping the density and velocity structure of neutral hydrogen (H i) in disc galaxies. For our analysis, we carry…”
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Angular momentum and local gravitational instability in galaxy discs: does Q correlate with j or M  ? by Romeo, Alessandro B, Mogotsi, Keoikantse Moses

“…ABSTRACT We introduce a new diagnostic for exploring the link between angular momentum and local gravitational instability in galaxy discs. Our diagnostic…”
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Characterizing gravitational instability in turbulent multicomponent galactic discs by Agertz, Oscar, Romeo, Alessandro B., Grisdale, Kearn

“…Gravitational instabilities play an important role in galaxy evolution and in shaping the interstellar medium (ISM). The ISM is observed to be highly…”
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The stellar velocity dispersion in nearby spirals: radial profiles and correlations by Mogotsi, Keoikantse Moses, Romeo, Alessandro B

“…ABSTRACT The stellar velocity dispersion, σ, is a quantity of crucial importance for spiral galaxies, where it enters fundamental dynamical processes such as…”
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On the observed diversity of star formation efficiencies in Giant Molecular Clouds by Grisdale, Kearn, Agertz, Oscar, Renaud, Florent, Romeo, Alessandro B, Devriendt, Julien, Slyz, Adrianne

“…Abstract Observations find a median star formation efficiency per free-fall time in Milky Way Giant Molecular Clouds (GMCs) of the order of $\epsilon _{\rm…”
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The effect of ISM turbulence on the gravitational instability of galactic discs by Hoffmann, Volker, Romeo, Alessandro B.

“…Abstract We investigate the gravitational instability of galactic discs, treating stars and cold interstellar gas as two distinct components, and taking into…”
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A double molecular disc in the triple-barred starburst galaxy NGC 6946: structure and stability by Romeo, Alessandro B., Fathi, Kambiz

“…The late-type spiral galaxy NGC 6946 is a prime example of molecular gas dynamics driven by ‘bars within bars’. Here, we use data from the BIMA Survey of…”
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A Toomre-like stability criterion for the clumpy and turbulent interstellar medium by Romeo, Alessandro B., Burkert, Andreas, Agertz, Oscar

“…We explore the gravitational instability of clumpy and turbulent gas discs, taking into account the Larson-type scaling laws observed in giant molecular clouds…”
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CHEMODYNAMIC EVOLUTION OF DWARF GALAXIES IN TIDAL FIELDS by Williamson, David, Martel, Hugo, Romeo, Alessandro B.

“…ABSTRACT The mass-metallicity relation shows that the galaxies with the lowest mass have the lowest metallicities. As most dwarf galaxies are in group…”
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