期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 770, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/770/2/L27
关键词
galaxies: active; galaxies: individual (NGC 1097); galaxies: kinematics and dynamics
资金
- Marie Curie Actions of the EC (FP7-COFUND)
- NSC of Taiwan [100-2112-M-001-006-MY3]
- Swedish Research Council
- Swedish Royal Academy of Sciences' Crafoord Prize Foundation
- Grants-in-Aid for Scientific Research [23540273] Funding Source: KAKEN
We present a kinematic analysis of the dense molecular gas in the central 200 pc of the nearby galaxy NGC 1097, based on Cycle 0 observations with the Atacama Large Millimeter/submillimeter Array (ALMA). We use the HCN(4-3) line to trace the densest interstellar molecular gas (n(H2) similar to 10(8) cm(-3)), and quantify its kinematics, and estimate an inflow rate for the molecular gas. We find a striking similarity between the ALMA kinematic data and the analytic spiral inflow model that we have previously constructed based on ionized gas velocity fields on larger scales. We are able to follow dense gas streaming down to 40 pc distance from the supermassive black hole in this Seyfert 1 galaxy. In order to fulfill marginal stability, we deduce that the dense gas is confined to a very thin disk, and we derive a dense gas inflow rate of 0.09 M-circle dot yr(-1) at 40 pc radius. Combined with previous values from the Ha and CO gas, we calculate a combined molecular and ionized gas inflow rate of similar to 0.2 M-circle dot yr(-1) at 40 pc distance from the central supermassive black hole of NGC 1097.
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