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Local analogs of high-redshift galaxies: Interstellar medium conditions

Published online by Cambridge University Press:  21 March 2017

Fuyan Bian ,
Lisa J. Kewley ,
Michael A. Dopita  and
Stephanie Juneau
Fuyan Bian
Affiliation:
Research School of Astronomy & Astrophysics, Australian National University, Canberra, ACT, 2611Australia email: [email protected]
Lisa J. Kewley
Affiliation:
Research School of Astronomy & Astrophysics, Australian National University, Canberra, ACT, 2611Australia email: [email protected]
Michael A. Dopita
Affiliation:
Research School of Astronomy & Astrophysics, Australian National University, Canberra, ACT, 2611Australia email: [email protected]
Stephanie Juneau
Affiliation:
CEA-Saclay, DSM/IRFU/SAp, 91191 Gif-sur-Yvette, France
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Abstract

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Local analog galaxies play an important role in understanding the properties of high-redshift galaxies. We present a method to select a type of local analog that closely resembles the ionized interstellar medium conditions in high-redshift galaxies. These galaxies are selected based on their locations in the [O III]/Hβ versus [N II]/Hα nebular emission-line diagnostic diagram. The ionization parameters and electron densities in these analogs are comparable to those in z ≃ 2 − 3 galaxies, but higher than those in normal SDSS galaxies by ≃ 0.6 dex and ≃ 0.9 dex, respectively. We find that the high sSFR and SFR surface density can enhance the electron densities and the ionization parameters, but still cannot fully explain the difference in ISM condition between nearby galaxies and the local analogs/high-redshift galaxies.

Keywords

ISM: evolutiongalaxies: high-redshiftgalaxies: ISM
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S321: Formation and Evolution of Galaxy Outskirts , March 2016 , pp. 333 - 335
Copyright
Copyright © International Astronomical Union 2017 

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