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Local analogs of high-redshift galaxies: Interstellar medium conditions

Published online by Cambridge University Press:  21 March 2017

Fuyan Bian
Affiliation:
Research School of Astronomy & Astrophysics, Australian National University, Canberra, ACT, 2611 Australia email: fuyan.bian@anu.edu.au
Lisa J. Kewley
Affiliation:
Research School of Astronomy & Astrophysics, Australian National University, Canberra, ACT, 2611 Australia email: fuyan.bian@anu.edu.au
Michael A. Dopita
Affiliation:
Research School of Astronomy & Astrophysics, Australian National University, Canberra, ACT, 2611 Australia email: fuyan.bian@anu.edu.au
Stephanie Juneau
Affiliation:
CEA-Saclay, DSM/IRFU/SAp, 91191 Gif-sur-Yvette, France
Corresponding
E-mail address:
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Abstract

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.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2017 

References

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