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Distance of the Seyfert 2 galaxy IC2560 and the Hubble constant

Published online by Cambridge University Press:  07 February 2024

Naomasa Nakai Open the ORCID record for Naomasa Nakai [Opens in a new window] ,
Aya Yamauchi ,
Madoka Yamazaki  and
Reo Harada
Naomasa Nakai*
Affiliation:
Kwansei Gakuin University, Sanda-shi, Hyogo 669-1330, Japan.
Aya Yamauchi
Affiliation:
National Astronomical Observatory of Japan, Oshu-shi, Iwate 023-0861, Japan
Madoka Yamazaki
Affiliation:
University of Tsukuba, Tsukuba-shi, Ibaraki 305-8571, Japan
Reo Harada
Affiliation:
Kwansei Gakuin University, Sanda-shi, Hyogo 669-1330, Japan.
*
email: ilo77771@kwansei.ac.jp
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Abstract

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Water vapor maser emission from a Seyfert 2 galaxy IC2560 was observed with sensitive VLBI. The accurate black hole mass was determined by separating the mass of the disk surrounding the black hole. In addition, the distance of the galaxy was directly measured from the maser disk. The Hubble constant determined using the distances and recession velocities of IC2560 and othere megamasers is inconsistent with that determined with CMB by 3–6 km s-1 Mpc-1.

Keywords

Active galactic nucleiAngular diameter distanceHubble constantWater vapor maser
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 18 , Symposium S380: Cosmic Masers: Proper Motion toward the Next-Generation Large Projects , December 2022 , pp. 12 - 15
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Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

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