The ALMA Discovery of the Rotating Disk and Fast Outflow of Cold Molecular Gas in NGC 1275
Journal article, 2019

We present observations using the Atacama Large Millimeter/submillimeter Array of the CO(2-1), HCN(3-2), and HCO+(3-2) lines in the nearby radio galaxy/brightest cluster galaxy (BCG) NGC 1275 with a spatial resolution of similar to 20 pc. In previous observations, the CO(2-1) emission was detected as radial filaments lying in the east west direction on a kiloparsec scale. We resolved the inner filament and found that it cannot be represented by a simple infalling stream on a sub-kiloparsec scale. The observed complex nature of the filament resembles the cold gas structure predicted by numerical simulations of cold chaotic accretion. Within the central 100 pc, we detected a rotational disk of molecular gas whose mass is similar to 10(8) M-circle dot. This is the first evidence of the presence of a massive cold gas disk on this spatial scale for BCGs. A crude estimate suggests that the accretion rate of the cold gas can be higher than that of hot gas. The disk rotation axis is approximately consistent with the radio-jet axis. This probably suggests that the cold gas disk is physically connected to the innermost accretion disk, which is responsible for jet launching. We also detected absorption features in the HCN(3-2) and HCO+(3-2) spectra against the radio continuum emission mostly radiated by a jet of size similar to 1.2 pc. The absorption features are blueshifted from the systemic velocity by similar to 300-600 km s(-1), suggesting the presence of outflowing gas from the active galactic nucleus (AGN). We discuss the relation of the AGN feeding with cold accretion, the origin of blueshifted absorption, and an estimate of the black hole mass using molecular gas dynamics.

galaxies: active

galaxies: elliptical and lenticular, cD

galaxies: individual (3C 84, NGC 1275, Perseus A)

galaxies: nuclei


H. Nagai

National Astronomical Observatory of Japan

The Graduate University for Advanced Studies (SOKENDAI)

Kyoko Onishi

Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics

Ehime University

N. Kawakatu

National Institute of Technology, Kure College

Y. Fujita

Osaka University

M. Kino

National Astronomical Observatory of Japan

Kogakuin University of Technology and Engineering

Y. Fukazawa

Hiroshima University

J. Lim

The University of Hong Kong

W. Forman

Harvard-Smithsonian Center for Astrophysics

J. Vrtilek

Harvard-Smithsonian Center for Astrophysics

K. Nakanishi

The Graduate University for Advanced Studies (SOKENDAI)

National Astronomical Observatory of Japan

H. Noda

Osaka University

K. Asada

Academia Sinica

K. Wajima

Korea Astronomy and Space Science Institute

Y. Ohyama

Academia Sinica

L. David

Harvard-Smithsonian Center for Astrophysics

K. Daikuhara

Toho University

Astrophysical Journal

0004-637X (ISSN) 1538-4357 (eISSN)

Vol. 883 2 193

Subject Categories

Astronomy, Astrophysics and Cosmology

Fusion, Plasma and Space Physics



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