Distance of the Seyfert 2 galaxy IC2560 and the Hubble constant
Abstract
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.
- Publication:
-
Cosmic Masers: Proper Motion Toward the Next-Generation Large Projects
- Pub Date:
- 2024
- DOI:
- Bibcode:
- 2024IAUS..380...12N
- Keywords:
-
- Active galactic nuclei;
- Angular diameter distance;
- Hubble constant;
- Water vapor maser