Modelling galaxy spectra in presence of interstellar dust – II. From the ultraviolet to the far-infrared
TLDR
In this article, the spectral energy distributions (SEDs) of different morphological types of galaxies are derived by using a simple geometrical model for each type of galaxy, based on a robust model of chemical evolution that assumes a suitable prescription for gas infall, initial mass function, star formation rate and stellar ejecta.Abstract:
In this paper, we present spectrophotometric models for galaxies of different morphological type whose spectral energy distributions (SEDs) take into account the effect of dust in absorbing UV-optical light and re-emitting it in the infrared (IR). The models contain three main components: (i) the diffuse interstellar medium (ISM) composed of gas and dust whose emission and extinction properties have already been studied in detail by Piovan et al. (2006), (ii) the large complexes of molecular clouds (MCs) in which new stars are formed and (iii) the stars of any age and chemical composition. The galaxy models stand on a robust model of chemical evolution that assuming a suitable prescription for gas infall, initial mass function, star formation rate and stellar ejecta provides the total amounts of gas and stars present at any age together with their chemical history. The chemical models are taylored in such a way to match the gross properties of galaxies of different morphological type. In order to describe the interaction between stars and ISM in building up the total SED of a galaxy, one has to know the spatial distribution of gas and stars. This is made adopting a simple geometrical model for each type of galaxy. The total gas and star mass provided by the chemical model are distributed over the whole volume by means of suitable density profiles, one for each component and depending on the galaxy type (spheroidal, disk and disk plus bulge). The galaxy is then split in suitable volume elements to each of which the appropriate amounts of stars, MCs and ISM are assigned. Each elemental volume bin is at the same time source of radiation from the stars inside and absorber and emitter of radiation from and to all other volume bins and the ISM in between. They are the elemental seeds to calculate the total SED. Using the results for the properties of the ISM and the Single Stellar Populations (SSPs) presented by Piovan et al. (2006) we derive the SEDs of galaxies of different morphological type. First the technical details of the method are described and the basic relations driving the interaction between the physical components of the galaxy are presented. Second, the main parameters are examined and their effects on the SED of three prototype galaxies (a disk, an elliptical and a starburster) are highlighted. The final part of the paper is devoted to assess the ability of our galaxy models in reproducing the SEDs of a few real galaxies of the Local Universe.read more
Citations
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Star Formation and AGN Activity in Galaxies Classified Using the 1.6 μm Bump and PAH Features at z = 0.4-2
Hitoshi Hanami,T. Ishigaki,Naofumi Fujishiro,Kouichiro Nakanishi,Takamitsu Miyaji,Takamitsu Miyaji,Mirko Krumpe,Keiichi Umetsu,Youichi Ohyama,Hyunjin Shim,Myungshin Im,H. M. Lee,Myung Gyoon Lee,Stephen Serjeant,Glenn J. White,Glenn J. White,Christopher N. A. Willmer,Tomotsugu Goto,Shinki Oyabu,Toshinobu Takagi,Takehiko Wada,Hideo Matsuhara +21 more
TL;DR: In this article, the star-formation and AGN activity of massive galaxies in the redshift range z = 0.4-2 were detected in a deep survey field using the AKARI InfraRed (IR) astronomical satellite and Subaru telescope toward the North Ecliptic Pole (NEP).
Journal ArticleDOI
Modelling the effects of dust evolution on the SEDs of galaxies of different morphological type
Andrew Schurer,Andrew Schurer,Francesco Calura,Laura Silva,A. Pipino,Gian Luigi Granato,Francesca Matteucci,Francesca Matteucci,Roberto Maiolino +8 more
TL;DR: In this article, the authors present photometric evolution models of galaxies, in which, in addition to the stellar component, the effects of an evolving dusty medium have been included with particular care.
Journal ArticleDOI
GALEX UV properties of the polar ring galaxy MCG-05-07-001 and the shell galaxies NGC 1210 and NGC 5329
A. Marino,A. Marino,E. Iodice,Rosaria Tantalo,Lorenzo Piovan,Daniela Bettoni,Lucio M. Buson,Cesare Chiosi,Giuseppe Galletta,Roberto Rampazzo,R. M. Rich +10 more
TL;DR: In this paper, the authors investigate the star formation histories of early-type galaxies and constrain the age of the accretion episode or merger that produced the shells and polar rings with the aid of composite stellar populations.
Journal ArticleDOI
Effect of the star formation histories on the SFR-M-* relation at z ≥ 2
Letizia P. Cassarà,D. Maccagni,B. Garilli,Marco Scodeggio,Rajat M. Thomas,O. Le Fevre,G. Zamorani,Daniel Schaerer,Daniel Schaerer,Brian C. Lemaux,Paolo Cassata,V. Le Brun,Laura Pentericci,L. A. M. Tasca,Eros Vanzella,E. Zucca,Ricardo Amorín,S. Bardelli,Marco Castellano,Alessandro Cimatti,O. Cucciati,O. Cucciati,A. Durkalec,Adriano Fontana,M. Giavalisco,Andrea Grazian,Nimish P. Hathi,O. Ilbert,S. Paltani,B. Ribeiro,V. Sommariva,V. Sommariva,Margherita Talia,Laurence Tresse,Daniela Vergani,Peter Capak,Stéphane Charlot,Thierry Contini,S. de la Torre,James Dunlop,Sotiria Fotopoulou,Lucia Guaita,Anton M. Koekemoer,C. Lopez-Sanjuan,Yannick Mellier,Janine Pforr,Mara Salvato,Nick Scoville,Yoshi Taniguchi,P. W. Wang +49 more
TL;DR: The spectral energy distribution (SED) fitting technique was performed by using GOSSIP+, a tool able to combine both photometric and spectroscopic information to extract the best value of the physical quantities of interest, and to consider the intergalactic medium attenuation as a free parameter as mentioned in this paper.
Journal ArticleDOI
The impact of the Star Formation Histories on the SFR-M$_{*}$ relation at z$\ge$2
Letizia P. Cassarà,D. Maccagni,B. Garilli,Marco Scodeggio,Rajat M. Thomas,O. Le Fevre,G. Zamorani,Daniel Schaerer,Brian Lemaux,Paolo Cassata,V. Le Brun,Laura Pentericci,L. A. M. Tasca,E. Vanzella,E. Zucca,Ricardo Amorín,S. Bardelli,M. Castellano,A. Cimatti,O. Cucciati,A. Durkalec,Adriano Fontana,M. Giavalisco,A. Grazian,Nimish P. Hathi,O. Ilbert,S. Paltani,B. Ribeiro,V. Sommariva,Margherita Talia,L. Tresse,D. Vergani,Peter Capak,Stéphane Charlot,T. Contini,S. de la Torre,James Dunlop,Sotiria Fotopoulou,L. Guaita,Anton M. Koekemoer,C. Lopez-Sanjuan,Yannick Mellier,Janine Pforr,Mara Salvato,Nick Scoville,Y. Taniguchi,P. W. Wang +46 more
TL;DR: In this article, the spectral energy distribution (SED) fitting technique is performed by using GOSSIP+, a tool able to combine both photometric and spectroscopic information to extract the best value of the physical quantities of interest, and to consider the Intergalactic Medium (IGM) attenuation as a free parameter.
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