EMPRESS. XII. Statistics on the Dynamics and Gas Mass Fraction of Extremely-Metal Poor Galaxies

We present demography of the dynamics and gas-mass fraction of 33 extremely metal-poor galaxies (EMPGs) with metallicities of \(0.015-0.195~Z_\odot\) and low stellar masses of \(10^4-10^8~M_\odot\) in the local universe. We conduct deep optical integral-field spectroscopy (IFS) for the low-mass EMPG...

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Published in:arXiv.org 2024-01
Main Authors: Xu, Yi, Ouchi, Masami, Isobe, Yuki, Nakajima, Kimihiko, Ozaki, Shinobu, Bouché, Nicolas F, Wise, John H, Emsellem, Eric, Kusakabe, Haruka, Hattori, Takashi, Nagao, Tohru, Gen Chiaki, Fukushima, Hajime, Harikane, Yuichi, Hayashi, Kohei, Hirai, Yutaka, Kim, Ji Hoon, Maseda, Michael V, Nagamine, Kentaro, Shibuya, Takatoshi, Sugahara, Yuma, Yajima, Hidenobu, Aoyama, Shohei, Fujimoto, Seiji, Fukushima, Keita, Hatano, Shun, Inoue, Akio K, Ishigaki, Tsuyoshi, Kawasaki, Masahiro, Kojima, Takashi, Komiyama, Yutaka, Koyama, Shuhei, Koyama, Yusei, Lee, Chien-Hsiu, Matsumoto, Akinori, Mawatari, Ken, Moriya, Takashi J, Motohara, Kentaro, Murai, Kai, Nishigaki, Moka, Onodera, Masato, Ono, Yoshiaki, Rauch, Michael, Saito, Tomoki, Sasaki, Rin, Suzuki, Akihiro, Takeuchi, Tsutomu T, Umeda, Hiroya, Umemura, Masayuki, Watanabe, Kuria, Yabe, Kiyoto, Zhang, Yechi
Format: Article
Language:English
Subjects:
Demography
Dispersion
Emission analysis
Galaxies
Gas dynamics
Metallicity
Stellar mass
Three dimensional models
Universe
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Summary:We present demography of the dynamics and gas-mass fraction of 33 extremely metal-poor galaxies (EMPGs) with metallicities of \(0.015-0.195~Z_\odot\) and low stellar masses of \(10^4-10^8~M_\odot\) in the local universe. We conduct deep optical integral-field spectroscopy (IFS) for the low-mass EMPGs with the medium high resolution (\(R=7500\)) grism of the 8m-Subaru FOCAS IFU instrument by the EMPRESS 3D survey, and investigate H\(\alpha\) emission of the EMPGs. Exploiting the resolution high enough for the low-mass galaxies, we derive gas dynamics with the H\(\alpha\) lines by the fitting of 3-dimensional disk models. We obtain an average maximum rotation velocity (\(v_\mathrm{rot}\)) of \(15\pm3~\mathrm{km~s^{-1}}\) and an average intrinsic velocity dispersion (\(\sigma_0\)) of \(27\pm10~\mathrm{km~s^{-1}}\) for 15 spatially resolved EMPGs out of the 33 EMPGs, and find that all of the 15 EMPGs have \(v_\mathrm{rot}/\sigma_0
ISSN:2331-8422
DOI:10.48550/arxiv.2303.12467