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Spectral synthesis is a powerful tool for interpreting the physical properties of galaxies by decomposing their spectral energy distributions into the main luminosity contributors (e.g. stellar populations or ionised gas). However, the…

The star formation rate is a crucial astrophysical tracer for understanding the formation and evolution of galaxies, determining the interaction between interstellar medium properties and star formation, thereby inferring the evolutionary…

Astrophysics of Galaxies · Physics 2025-03-05 Yaosong Yu , Qihang Chen , Liang Jing , Ciro Pappalardo , Henrique Miranda

Nebular emission lines are critical to measure physical properties in the ionized gas (e.g., metallicity, the SFR, or dust attenuation). They also account for a significant fraction of broadband fluxes, in particular at the highest…

Astrophysics of Galaxies · Physics 2020-01-08 Fang-Ting Yuan , Denis Burgarella , David Corre , Veronique Buat , Médéric Boquien , Shiyin Shen

The code FADO is the first publicly available population spectral synthesis tool that treats the contribution from ionised gas to the observed emission self-consistently. We study the impact of the nebular contribution on the determination…

We present a new approach to constrain galaxy physical parameters from the combined interpretation of stellar and nebular emission in wide ranges of observations. This approach relies on the Bayesian analysis of any type of galaxy spectral…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-03 Camilla Pacifici , Stephane Charlot , Jeremy Blaizot , Jarle Brinchmann

We highlight and discuss the importance of accounting for nebular emission in the SEDs of high redshift galaxies, as lines and continuum emission can contribute significantly or subtly to broad-band photometry. Physical parameters such as…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-03 Daniel Schaerer , Stephane de Barros

Strong nebular emission lines are an important diagnostic tool for tracing the evolution of star-forming galaxies across cosmic time. However, different observational setups can affect these lines, and the derivation of the physical nebular…

Several works have now shown that nebular emission can have a significant impact on broad-band photometry of high-redshift galaxies ($z > 3$), and how this can affect parameter estimation from SED fitting. So far relatively small…

Cosmology and Nongalactic Astrophysics · Physics 2013-10-15 S. de Barros , H. Nayyeri , N. Reddy , B. Mobasher

The physical properties inferred from the SEDs of z>3 galaxies have been influential in shaping our understanding of early galaxy formation and the role galaxies may play in cosmic reionization. Of particular importance is the stellar mass…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-11 Daniel P. Stark , Matthew A. Schenker , Richard S. Ellis , Brant Robertson , Ross McLure , James Dunlop

We present a homogeneous, detailed analysis of the spectral energy distribution (SED) of $\sim$ 1700 LBGs from the GOODS-MUSIC catalogue with deep multi-wavelength photometry from $U$ band to 8 $\mu$m to determine stellar mass, age, dust…

Cosmology and Nongalactic Astrophysics · Physics 2014-05-08 S. de Barros , D. Schaerer , D. P. Stark

Extreme emission line galaxies (EELGs) are a notable galaxy genus, ultimately being regarded as local prototypes of early galaxies at the cosmic noon. Robust characterisation of their stellar content, however, is hindered by the…

By combining optical and near-IR observations from the Hubble Space Telescope with NIR photometry from the Spitzer Space Telescope it is possible to measure the rest-frame UV-optical colours of galaxies at z=4-8. The UV-optical spectral…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-17 Stephen M. Wilkins , William Coulton , Joseph Caruana , Rupert Croft , Tiziana Di Matteo , Nishikanta Khandai , Yu Feng , Andrew Bunker , Holly Elbert

Spectral population synthesis (PS) is a fundamental tool in extragalactic research that aims to decipher the assembly history of galaxies from their SED. However, until recently all PS codes were restricted to purely stellar fits,…

Astrophysics of Galaxies · Physics 2020-01-24 Leandro S. M. Cardoso , Jean Michel Gomes , Polychronis Papaderos

Growing observational evidence now indicates that nebular line emission has a significant impact on the rest-frame optical fluxes of z~5-7 galaxies observed with Spitzer. This line emission makes z~5-7 galaxies appear more massive, with…

We study the physical origin and spectroscopic impact of extreme nebular emission in high-redshift galaxies. The nebular continuum, which can appear during an extreme starburst, is of particular importance as it tends to redden UV slopes…

A substantial fraction of the light emitted from young or star-forming galaxies at ultraviolet to near-infrared wavelengths comes from the ionized interstellar medium in the form of emission lines and a nebular continuum. At high redshifts,…

Astrophysics · Physics 2009-11-13 E. Zackrisson , N. Bergvall , E. Leitet

We use a sample of 149 spectroscopically confirmed UV-selected galaxies at $z\sim 2$ to investigate the relative dust attenuation of the stellar continuum and the nebular emission lines. For each galaxy in the sample, at least one…

Astrophysics of Galaxies · Physics 2017-03-22 S. de Barros , N. Reddy , I. Shivaei

In this spectroscopic study of infant massive star clusters, we find that continuum emission from ionized gas rivals the stellar luminosity at optical wavelengths. In addition, we find that nebular line emission is significant in many…

Astrophysics of Galaxies · Physics 2014-11-20 Amy E. Reines , David L. Nidever , David G. Whelan , Kelsey E. Johnson

One of the most remarkable outcomes from \textit{JWST} has been the exquisite UV-optical spectroscopic data for galaxies in the high-redshift Universe ($z \geq 5$), enabling the use of various nebular emission lines to infer conditions of…

This paper presents a new spectral evolutionary model of galaxies, properly taking the effects of nebular emission and pre-main sequence evolution into account. The impact of these features in different photometric filters is evaluated,…

Astrophysics · Physics 2009-11-06 Erik Zackrisson , Nils Bergvall , Kjell Olofsson , Arnaud Siebert
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