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The interstellar medium heated by SN explosions may acquire an expansion velocity larger than the escape velocity and leave the galaxy through a supersonic wind. SN ejecta are transported out of the galaxies by such winds which thus affect…

Astrophysics · Physics 2009-11-10 C. Melioli , E. M. de Gouveia Dal Pino

Emission lines in X-ray spectra of clusters of galaxies reveal the presence of heavy elements in the diffuse hot plasma (ICM) in virial equilibrium in the dark matter potential well. Thanks to the X-ray satellites Chandra and XMM-Newton we…

Astrophysics · Physics 2010-11-11 P. Tozzi

Recent studies have indicated that the HCN-to-CO(J=1-0) and HCO+-to-HCN(J=1-0) ratios are significantly different between galaxies with AGN (active galactic nucleus) and SB (starburst) signatures. In order to study the molecular gas…

Astrophysics · Physics 2009-11-13 M. Krips , R. Neri , S. Garcia-Burillo , S. Martin , F. Combes , J. Gracia-Carpio , A. Eckart

Nearby dwarf irregular galaxies are ideal laboratories for studying the interstellar medium (ISM) at low metallicity, which is expected to be common for galaxies at very high redshift being observed by the James Webb Space Telescope. We…

Astrophysics of Galaxies · Physics 2023-08-02 Chia-Yu Hu , Amiel Sternberg , Ewine F. van Dishoeck

(Abridged.) We present one-zone chemical evolution models for two dwarf starburst galaxies, NGC 1705 and NGC 1569. Using information about the past star formation history and initial mass function of the systems previously obtained from…

Astrophysics · Physics 2016-08-30 Donatella Romano , Monica Tosi , Francesca Matteucci

We investigate the redshift evolution of the [OIII]/Hb nebular emission line ratio for a sample of galaxies spanning the redshift range 0 < z < 4. We compare the observed evolution to a set of theoretical models which account for the…

Astrophysics of Galaxies · Physics 2016-07-27 F. Cullen , M. Cirasuolo , L. J. Kewley , R. J. McLure , J. S. Dunlop , R. A. A. Bowler

The feedback from galactic outflows is thought to play an important role in shaping the gas content, star formation history, and ultimately the stellar mass function of galaxies. Here we present evidence for massive molecular outflows…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-27 Aeree Chung , Min S. Yun , Gopal Naraynan , Mark Heyer , Neal R. Erickson

The metal content of clusters of galaxies and its relation to their stellar content is revisited making use of a cluster sample for which all four basic parameters are homogeneously measured within consistent radii, namely core-excised…

Astrophysics of Galaxies · Physics 2015-06-22 A. Renzini , S. Andreon

We present illustrative models for the UV to millimeter emission of starburst galaxies which are treated as an ensemble of optically thick giant molecular clouds (GMCs) centrally illuminated by recently formed stars. The models follow the…

Astrophysics · Physics 2009-10-31 A. Efstathiou , M. Rowan-Robinson , R. Siebenmorgen

We present interferometric observations of three ultraluminous infrared galaxies (ULIRGs; UGC 5101, Mrk 273, and IRAS 17208-0014) in the 3-mm wavelength range, using the Nobeyama Millimeter Array. Both the HCN (J=1-0) and HCO+ (J=1-0)…

Astrophysics · Physics 2008-11-26 Masatoshi Imanishi , Kouichiro Nakanishi , Kotaro Kohno

Context. Multi-wavelength studies of galaxies and galactic nuclei allow us to build a relatively more complete picture of the interstellar medium (ISM), especially in the dusty regions of starburst galaxies. An understanding of the physical…

Substructure in the interstellar medium (ISM) is crucial for establishing the correlation between star formation and feedback and has the capacity to significantly perturb stellar orbits, thus playing a central role in galaxy dynamics and…

Astrophysics of Galaxies · Physics 2026-02-06 Shaunak Modak , Eve C. Ostriker , Chris Hamilton , Scott Tremaine

In this work we conclude the analysis of our CO line survey of Luminous Infrared Galaxies (LIRGs: L_{IR}>=10^{11}L_{sol}) in the local Universe (Paper\,I), by focusing on the influence of their average ISM properties on the total molecular…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-04 Padelis P. Papadopoulos , Paul van der Werf , E Xilouris , Kate G. Isaak , Yu Gao

HCN molecules serve as an important tracer for chemical evolution of elemental nitrogen in the regions of star and planet formation. This is largely explained by the fact that N atoms and N$_2$ molecules are poorly accessible for the…

We present the results of our ALMA HCN J=3-2 and HCO+ J=3-2 line observations of a uniformly selected sample (>25) of nearby ultraluminous infrared galaxies (ULIRGs) at z < 0.15. The emission of these dense molecular gas tracers and…

Astrophysics of Galaxies · Physics 2019-04-03 Masatoshi Imanishi , Kouichiro Nakanishi , Takuma Izumi

A multi-line millimeter-wave study of the nearby starburst galaxy NGC 4945 has been carried out using the Swedish-ESO Submillimeter Telescope (SEST). The study covers the frequency range from 82 GHz to 354 GHz and includes 80 transitions of…

Astrophysics · Physics 2009-11-10 M. Wang , C. Henkel , Y. -N. Chin , J. Whiteoak , M. Cunningham , R. Mauersberger , D. Muders

Chemical abundances provide important clues to the evolution of galaxies. Ionized nebulae are one of the main sources of chemical abundance measurements, especially in external galaxies. Studies of H II regions have shown that the overall…

Astrophysics · Physics 2007-05-23 G. A. Shields

High star-formation rate and active galactic nucleus' emission can significantly transform the interstellar medium. In ultra-luminous infrared galaxies, in which the star-formation rate reaches thousands of solar masses per year, the gas…

We present results from our VLT Large Program to study the dynamical evolution of Ultraluminous Infrared Galaxies (ULIRGs). We have so far obtained near-infrared high-resolution ISAAC spectra of 53 local ULIRGs at several merger timescales…

Astrophysics · Physics 2007-05-23 K. M. Dasyra , L. J. Tacconi , R. I. Davies , R. Genzel , D. Lutz , T. Naab , A. Burkert

Luminous infrared galaxies ($L_{\rm{IR}}>10^{11} L_{\odot}$) are often associated with interacting galactic systems and are thought to be powered by merger--induced starbursts and/or dust--enshrouded AGN. In such systems, the evolution of…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-18 J. Leech , K. G. Isaak , P. P. Papadopoulos , Y. Gao , G. R. Davis
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