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Article: The ALMA Discovery of the Rotating Disk and Fast Outflow of Cold Molecular Gas in NGC 1275

TitleThe ALMA Discovery of the Rotating Disk and Fast Outflow of Cold Molecular Gas in NGC 1275
Authors
Keywordsgalaxies
Activegalaxies
Elliptical and lenticular, cD
galaxies: Individual (3C 84, NGC 1275, Perseus A)
galaxies: Nuclei
Issue Date2019
PublisherAmerican Astronomical Society, co-published with Institute of Physics Publishing, Inc. The Journal's web site is located at http://iopscience.iop.org/0004-637X/
Citation
The Astrophysical Journal, 2019, v. 883 n. 2, p. article no. 193 How to Cite?
AbstractWe 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 ~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 ~108 M ⊙. 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 ~1.2 pc. The absorption features are blueshifted from the systemic velocity by ~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.
Persistent Identifierhttp://hdl.handle.net/10722/279999
ISSN
2017 Impact Factor: 5.551
2015 SCImago Journal Rankings: 3.266

 

DC FieldValueLanguage
dc.contributor.authorNagai, H-
dc.contributor.authorOnishi, K-
dc.contributor.authorKawakatu, N-
dc.contributor.authorFujita, Y-
dc.contributor.authorKino, M-
dc.contributor.authorFukazawa, Y-
dc.contributor.authorLim, J-
dc.contributor.authorForman, W-
dc.contributor.authorVrtilek, J-
dc.contributor.authorNakanishi, K-
dc.contributor.authorNoda, H-
dc.contributor.authorAsada, K-
dc.contributor.authorWajima, K-
dc.contributor.authorOhyama, Y-
dc.contributor.authorDavid, L-
dc.contributor.authorDaikuhara, K-
dc.date.accessioned2019-12-23T08:24:47Z-
dc.date.available2019-12-23T08:24:47Z-
dc.date.issued2019-
dc.identifier.citationThe Astrophysical Journal, 2019, v. 883 n. 2, p. article no. 193-
dc.identifier.issn0004-637X-
dc.identifier.urihttp://hdl.handle.net/10722/279999-
dc.description.abstractWe 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 ~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 ~108 M ⊙. 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 ~1.2 pc. The absorption features are blueshifted from the systemic velocity by ~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.-
dc.languageeng-
dc.publisherAmerican Astronomical Society, co-published with Institute of Physics Publishing, Inc. The Journal's web site is located at http://iopscience.iop.org/0004-637X/-
dc.relation.ispartofThe Astrophysical Journal-
dc.rightsThe Astrophysical Journal. Copyright © American Astronomical Society, co-published with Institute of Physics Publishing, Inc.-
dc.subjectgalaxies-
dc.subjectActivegalaxies-
dc.subjectElliptical and lenticular, cD-
dc.subjectgalaxies: Individual (3C 84, NGC 1275, Perseus A)-
dc.subjectgalaxies: Nuclei-
dc.titleThe ALMA Discovery of the Rotating Disk and Fast Outflow of Cold Molecular Gas in NGC 1275-
dc.typeArticle-
dc.identifier.emailLim, J: jjlim@hku.hk-
dc.identifier.authorityLim, J=rp00745-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.3847/1538-4357/ab3e6e-
dc.identifier.scopuseid_2-s2.0-85073748476-
dc.identifier.hkuros308729-
dc.identifier.volume883-
dc.identifier.issue2-
dc.identifier.spagearticle no. 193-
dc.identifier.epagearticle no. 193-
dc.publisher.placeUnited States-

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