EMPRESS. VIII. A New Determination of Primordial He Abundance with Extremely Metal-poor Galaxies: A Suggestion of the Lepton Asymmetry and Implications for the Hubble Tension

Research output: Contribution to journal › Journal article › Research › peer-review

Standard

EMPRESS. VIII. A New Determination of Primordial He Abundance with Extremely Metal-poor Galaxies : A Suggestion of the Lepton Asymmetry and Implications for the Hubble Tension. / Matsumoto, Akinori; Ouchi, Masami; Nakajima, Kimihiko; Kawasaki, Masahiro; Murai, Kai; Motohara, Kentaro; Harikane, Yuichi; Ono, Yoshiaki; Kushibiki, Kosuke; Koyama, Shuhei; Aoyama, Shohei; Konishi, Masahiro; Takahashi, Hidenori; Isobe, Yuki; Umeda, Hiroya; Sugahara, Yuma; Onodera, Masato; Nagamine, Kentaro; Kusakabe, Haruka; Hirai, Yutaka; Moriya, Takashi J.; Shibuya, Takatoshi; Komiyama, Yutaka; Fukushima, Keita; Fujimoto, Seiji; Hattori, Takashi; Hayashi, Kohei; Inoue, Akio K.; Kikuchihara, Shotaro; Kojima, Takashi; Koyama, Yusei; Lee, Chien Hsiu; Mawatari, Ken; Miyata, Takashi; Nagao, Tohru; Ozaki, Shinobu; Rauch, Michael; Saito, Tomoki; Suzuki, Akihiro; Takeuchi, Tsutomu T.; Umemura, Masayuki; Xu, Yi; Yabe, Kiyoto; Zhang, Yechi; Yoshii, Yuzuru.

In: Astrophysical Journal, Vol. 941, No. 2, 167, 01.12.2022.

Research output: Contribution to journal › Journal article › Research › peer-review

Harvard

Matsumoto, A, Ouchi, M, Nakajima, K, Kawasaki, M, Murai, K, Motohara, K, Harikane, Y, Ono, Y, Kushibiki, K, Koyama, S, Aoyama, S, Konishi, M, Takahashi, H, Isobe, Y, Umeda, H, Sugahara, Y, Onodera, M, Nagamine, K, Kusakabe, H, Hirai, Y, Moriya, TJ, Shibuya, T, Komiyama, Y, Fukushima, K, Fujimoto, S, Hattori, T, Hayashi, K, Inoue, AK, Kikuchihara, S, Kojima, T, Koyama, Y, Lee, CH, Mawatari, K, Miyata, T, Nagao, T, Ozaki, S, Rauch, M, Saito, T, Suzuki, A, Takeuchi, TT, Umemura, M, Xu, Y, Yabe, K, Zhang, Y & Yoshii, Y 2022, 'EMPRESS. VIII. A New Determination of Primordial He Abundance with Extremely Metal-poor Galaxies: A Suggestion of the Lepton Asymmetry and Implications for the Hubble Tension', Astrophysical Journal, vol. 941, no. 2, 167. https://doi.org/10.3847/1538-4357/ac9ea1

APA

Matsumoto, A., Ouchi, M., Nakajima, K., Kawasaki, M., Murai, K., Motohara, K., Harikane, Y., Ono, Y., Kushibiki, K., Koyama, S., Aoyama, S., Konishi, M., Takahashi, H., Isobe, Y., Umeda, H., Sugahara, Y., Onodera, M., Nagamine, K., Kusakabe, H., ... Yoshii, Y. (2022). EMPRESS. VIII. A New Determination of Primordial He Abundance with Extremely Metal-poor Galaxies: A Suggestion of the Lepton Asymmetry and Implications for the Hubble Tension. Astrophysical Journal, 941(2), [167]. https://doi.org/10.3847/1538-4357/ac9ea1

Vancouver

Matsumoto A, Ouchi M, Nakajima K, Kawasaki M, Murai K, Motohara K et al. EMPRESS. VIII. A New Determination of Primordial He Abundance with Extremely Metal-poor Galaxies: A Suggestion of the Lepton Asymmetry and Implications for the Hubble Tension. Astrophysical Journal. 2022 Dec 1;941(2). 167. https://doi.org/10.3847/1538-4357/ac9ea1

Author

Matsumoto, Akinori ; Ouchi, Masami ; Nakajima, Kimihiko ; Kawasaki, Masahiro ; Murai, Kai ; Motohara, Kentaro ; Harikane, Yuichi ; Ono, Yoshiaki ; Kushibiki, Kosuke ; Koyama, Shuhei ; Aoyama, Shohei ; Konishi, Masahiro ; Takahashi, Hidenori ; Isobe, Yuki ; Umeda, Hiroya ; Sugahara, Yuma ; Onodera, Masato ; Nagamine, Kentaro ; Kusakabe, Haruka ; Hirai, Yutaka ; Moriya, Takashi J. ; Shibuya, Takatoshi ; Komiyama, Yutaka ; Fukushima, Keita ; Fujimoto, Seiji ; Hattori, Takashi ; Hayashi, Kohei ; Inoue, Akio K. ; Kikuchihara, Shotaro ; Kojima, Takashi ; Koyama, Yusei ; Lee, Chien Hsiu ; Mawatari, Ken ; Miyata, Takashi ; Nagao, Tohru ; Ozaki, Shinobu ; Rauch, Michael ; Saito, Tomoki ; Suzuki, Akihiro ; Takeuchi, Tsutomu T. ; Umemura, Masayuki ; Xu, Yi ; Yabe, Kiyoto ; Zhang, Yechi ; Yoshii, Yuzuru. / EMPRESS. VIII. A New Determination of Primordial He Abundance with Extremely Metal-poor Galaxies : A Suggestion of the Lepton Asymmetry and Implications for the Hubble Tension. In: Astrophysical Journal. 2022 ; Vol. 941, No. 2.

Bibtex

@article{883e842bace543708713e06dbd29b3dd,
title = "EMPRESS. VIII. A New Determination of Primordial He Abundance with Extremely Metal-poor Galaxies: A Suggestion of the Lepton Asymmetry and Implications for the Hubble Tension",
abstract = "The primordial He abundance Y P is a powerful probe of cosmology. Currently, Y P is best determined by observations of metal-poor galaxies, while there are only a few known local extremely metal-poor (<0.1Z ⊙) galaxies (EMPGs) having reliable He/H measurements with He i λ10830 near-infrared (NIR) emission. Here we present deep Subaru NIR spectroscopy for 10 EMPGs. Combining the existing optical data, He/H values of 5 out of the 10 EMPGs are reliably derived by the Markov chain Monte Carlo algorithm. Adding the existing 3 EMPGs and 51 moderately metal-poor (0.1-0.4Z ⊙) galaxies with reliable He/H estimates, we obtain Y P = 0.2370 − 0.0034 + 0.0033 by linear regression in the (He/H) − (O/H) plane, where we increase the number of EMPGs from three to eight anchoring He/H of the most metal-poor gas in galaxies. Although our Y P measurement and previous measurements are consistent, our result is slightly (∼1σ) smaller due to our EMPGs. Including the existing primordial deuterium D P measurement, we constrain the effective number of neutrino species N eff and the baryon-to-photon ratio η showing ≳1-2σ tensions with the Standard Model and Planck Collaboration et al. (2020). Motivated by the tensions, we allow the degeneracy parameter of the electron neutrino ξ e , as well as N eff and η, to vary. We obtain ξ e = 0.05 − 0.02 + 0.03 , N eff = 3.11 − 0.31 + 0.34 , and η × 10 10 = 6.08 − 0.06 + 0.06 from the Y P and D P measurements with a prior of η taken from Planck Collaboration et al. Our constraints suggest a lepton asymmetry and allow for a high value of N eff within the 1σ level, which could mitigate the Hubble tension.",
author = "Akinori Matsumoto and Masami Ouchi and Kimihiko Nakajima and Masahiro Kawasaki and Kai Murai and Kentaro Motohara and Yuichi Harikane and Yoshiaki Ono and Kosuke Kushibiki and Shuhei Koyama and Shohei Aoyama and Masahiro Konishi and Hidenori Takahashi and Yuki Isobe and Hiroya Umeda and Yuma Sugahara and Masato Onodera and Kentaro Nagamine and Haruka Kusakabe and Yutaka Hirai and Moriya, {Takashi J.} and Takatoshi Shibuya and Yutaka Komiyama and Keita Fukushima and Seiji Fujimoto and Takashi Hattori and Kohei Hayashi and Inoue, {Akio K.} and Shotaro Kikuchihara and Takashi Kojima and Yusei Koyama and Lee, {Chien Hsiu} and Ken Mawatari and Takashi Miyata and Tohru Nagao and Shinobu Ozaki and Michael Rauch and Tomoki Saito and Akihiro Suzuki and Takeuchi, {Tsutomu T.} and Masayuki Umemura and Yi Xu and Kiyoto Yabe and Yechi Zhang and Yuzuru Yoshii",
note = "Publisher Copyright: {\textcopyright} 2022. The Author(s). Published by the American Astronomical Society.",
year = "2022",
month = dec,
day = "1",
doi = "10.3847/1538-4357/ac9ea1",
language = "English",
volume = "941",
journal = "Astrophysical Journal",
issn = "0067-0049",
publisher = "Institute of Physics Publishing, Inc",
number = "2",

}

RIS

TY - JOUR

T1 - EMPRESS. VIII. A New Determination of Primordial He Abundance with Extremely Metal-poor Galaxies

T2 - A Suggestion of the Lepton Asymmetry and Implications for the Hubble Tension

AU - Matsumoto, Akinori

AU - Ouchi, Masami

AU - Nakajima, Kimihiko

AU - Kawasaki, Masahiro

AU - Murai, Kai

AU - Motohara, Kentaro

AU - Harikane, Yuichi

AU - Ono, Yoshiaki

AU - Kushibiki, Kosuke

AU - Koyama, Shuhei

AU - Aoyama, Shohei

AU - Konishi, Masahiro

AU - Takahashi, Hidenori

AU - Isobe, Yuki

AU - Umeda, Hiroya

AU - Sugahara, Yuma

AU - Onodera, Masato

AU - Nagamine, Kentaro

AU - Kusakabe, Haruka

AU - Hirai, Yutaka

AU - Moriya, Takashi J.

AU - Shibuya, Takatoshi

AU - Komiyama, Yutaka

AU - Fukushima, Keita

AU - Fujimoto, Seiji

AU - Hattori, Takashi

AU - Hayashi, Kohei

AU - Inoue, Akio K.

AU - Kikuchihara, Shotaro

AU - Kojima, Takashi

AU - Koyama, Yusei

AU - Lee, Chien Hsiu

AU - Mawatari, Ken

AU - Miyata, Takashi

AU - Nagao, Tohru

AU - Ozaki, Shinobu

AU - Rauch, Michael

AU - Saito, Tomoki

AU - Suzuki, Akihiro

AU - Takeuchi, Tsutomu T.

AU - Umemura, Masayuki

AU - Xu, Yi

AU - Yabe, Kiyoto

AU - Zhang, Yechi

AU - Yoshii, Yuzuru

N1 - Publisher Copyright: © 2022. The Author(s). Published by the American Astronomical Society.

PY - 2022/12/1

Y1 - 2022/12/1

N2 - The primordial He abundance Y P is a powerful probe of cosmology. Currently, Y P is best determined by observations of metal-poor galaxies, while there are only a few known local extremely metal-poor (<0.1Z ⊙) galaxies (EMPGs) having reliable He/H measurements with He i λ10830 near-infrared (NIR) emission. Here we present deep Subaru NIR spectroscopy for 10 EMPGs. Combining the existing optical data, He/H values of 5 out of the 10 EMPGs are reliably derived by the Markov chain Monte Carlo algorithm. Adding the existing 3 EMPGs and 51 moderately metal-poor (0.1-0.4Z ⊙) galaxies with reliable He/H estimates, we obtain Y P = 0.2370 − 0.0034 + 0.0033 by linear regression in the (He/H) − (O/H) plane, where we increase the number of EMPGs from three to eight anchoring He/H of the most metal-poor gas in galaxies. Although our Y P measurement and previous measurements are consistent, our result is slightly (∼1σ) smaller due to our EMPGs. Including the existing primordial deuterium D P measurement, we constrain the effective number of neutrino species N eff and the baryon-to-photon ratio η showing ≳1-2σ tensions with the Standard Model and Planck Collaboration et al. (2020). Motivated by the tensions, we allow the degeneracy parameter of the electron neutrino ξ e , as well as N eff and η, to vary. We obtain ξ e = 0.05 − 0.02 + 0.03 , N eff = 3.11 − 0.31 + 0.34 , and η × 10 10 = 6.08 − 0.06 + 0.06 from the Y P and D P measurements with a prior of η taken from Planck Collaboration et al. Our constraints suggest a lepton asymmetry and allow for a high value of N eff within the 1σ level, which could mitigate the Hubble tension.

AB - The primordial He abundance Y P is a powerful probe of cosmology. Currently, Y P is best determined by observations of metal-poor galaxies, while there are only a few known local extremely metal-poor (<0.1Z ⊙) galaxies (EMPGs) having reliable He/H measurements with He i λ10830 near-infrared (NIR) emission. Here we present deep Subaru NIR spectroscopy for 10 EMPGs. Combining the existing optical data, He/H values of 5 out of the 10 EMPGs are reliably derived by the Markov chain Monte Carlo algorithm. Adding the existing 3 EMPGs and 51 moderately metal-poor (0.1-0.4Z ⊙) galaxies with reliable He/H estimates, we obtain Y P = 0.2370 − 0.0034 + 0.0033 by linear regression in the (He/H) − (O/H) plane, where we increase the number of EMPGs from three to eight anchoring He/H of the most metal-poor gas in galaxies. Although our Y P measurement and previous measurements are consistent, our result is slightly (∼1σ) smaller due to our EMPGs. Including the existing primordial deuterium D P measurement, we constrain the effective number of neutrino species N eff and the baryon-to-photon ratio η showing ≳1-2σ tensions with the Standard Model and Planck Collaboration et al. (2020). Motivated by the tensions, we allow the degeneracy parameter of the electron neutrino ξ e , as well as N eff and η, to vary. We obtain ξ e = 0.05 − 0.02 + 0.03 , N eff = 3.11 − 0.31 + 0.34 , and η × 10 10 = 6.08 − 0.06 + 0.06 from the Y P and D P measurements with a prior of η taken from Planck Collaboration et al. Our constraints suggest a lepton asymmetry and allow for a high value of N eff within the 1σ level, which could mitigate the Hubble tension.

U2 - 10.3847/1538-4357/ac9ea1

DO - 10.3847/1538-4357/ac9ea1

M3 - Journal article

AN - SCOPUS:85145316755

VL - 941

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0067-0049

IS - 2

M1 - 167

ER -

ID: 342931938