Local analogs of high-redshift galaxies: Interstellar medium conditions

Fuyan Bian; Lisa J. Kewley; Michael A. Dopita; Stephanie Juneau

doi:10.1017/S1743921316009261

Local analogs of high-redshift galaxies: Interstellar medium conditions

Fuyan Bian, Lisa J. Kewley, Michael A. Dopita, Stephanie Juneau

Research output: Contribution to journal › Article › peer-review

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.

Original language	English
Pages (from-to)	333-335
Number of pages	3
Journal	Proceedings of the International Astronomical Union
Volume	11
Issue number	S321
DOIs	https://doi.org/10.1017/S1743921316009261
Publication status	Published - 1 Mar 2016

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title = "Local analogs of high-redshift galaxies: Interstellar medium conditions",

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.",

keywords = "galaxies: high-redshift, galaxies: ISM, ISM: evolution",

author = "Fuyan Bian and Kewley, {Lisa J.} and Dopita, {Michael A.} and Stephanie Juneau",

note = "Publisher Copyright: {\textcopyright} 2017 International Astronomical Union.",

year = "2016",

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doi = "10.1017/S1743921316009261",

language = "English",

volume = "11",

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journal = "Proceedings of the International Astronomical Union",

issn = "1743-9213",

publisher = "Cambridge University Press",

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TY - JOUR

T1 - Local analogs of high-redshift galaxies

T2 - Interstellar medium conditions

AU - Bian, Fuyan

AU - Kewley, Lisa J.

AU - Dopita, Michael A.

AU - Juneau, Stephanie

PY - 2016/3/1

Y1 - 2016/3/1

N2 - 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.

AB - 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.

KW - galaxies: high-redshift

KW - galaxies: ISM

KW - ISM: evolution

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U2 - 10.1017/S1743921316009261

DO - 10.1017/S1743921316009261

M3 - Article

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VL - 11

SP - 333

EP - 335

JO - Proceedings of the International Astronomical Union

JF - Proceedings of the International Astronomical Union

IS - S321

ER -

Local analogs of high-redshift galaxies: Interstellar medium conditions

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