Investigating the drivers of electron temperature variations in H II regions with Keck-KCWI and VLT-MUSE

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A90106%2F24%3A00617596" target="_blank" >RIV/67985815:90106/24:00617596 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.3847/1538-4357/ad303c" target="_blank" >https://doi.org/10.3847/1538-4357/ad303c</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3847/1538-4357/ad303c" target="_blank" >10.3847/1538-4357/ad303c</a>

Result language

angličtina

Original language name

Investigating the drivers of electron temperature variations in H II regions with Keck-KCWI and VLT-MUSE

Original language description

H ii region electron temperatures are a critical ingredient in metallicity determinations, and recent observations have revealed systematic variations in the temperatures measured using different ions. We present electron temperatures (T-e) measured using the optical auroral lines ([N ii]lambda 5756, [O ii]lambda lambda 7320, 7330, [S ii]lambda lambda 4069, 4076, [O iii]lambda 4363, and [S iii]lambda 6312) for a sample of H ii regions in seven nearby galaxies. We use observations from the Physics at High Angular resolution in Nearby Galaxies survey (PHANGS) obtained with integral field spectrographs on Keck (Keck Cosmic Web Imager) and the Very Large Telescope (Multi-Unit Spectroscopic Explorer). We compare the different T-e measurements with H ii region and ISM environmental properties such as electron density, ionization parameter, molecular gas velocity dispersion, and stellar association/cluster mass and age obtained from PHANGS. We find that the temperatures from [O ii] and [S ii] are likely overestimated due to the presence of electron density inhomogeneities in H ii regions. We measure high [O iii] temperatures in a subset of regions with high molecular gas velocity dispersion and low ionization parameter, which may be explained by the presence of low-velocity shocks. In agreement with previous studies, the T-e-T-e between [N ii] and [S iii] temperatures have the lowest observed scatter and follow predictions from photoionization modeling, which suggests that these tracers reflect H ii region temperatures across the various ionization zones better than [O ii], [S ii], and [O iii].

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10308 - Astronomy (including astrophysics,space science)

Project

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Continuities

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Publication year

2024

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Astrophysical Journal

ISSN

0004-637X

e-ISSN

1538-4357

Volume of the periodical

966

Issue of the periodical within the volume

1

Country of publishing house

GB - UNITED KINGDOM

Number of pages

50

Pages from-to

130

UT code for WoS article

001220806800001

EID of the result in the Scopus database

2-s2.0-85192208990