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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 559166.0, MPI für Astronomie / Publikationen_mpia
Cold molecular gas in the inner two kiloparsecs of NGC 4151
Authors:Dumas, G.; Schinnerer, E.; Mundell, C. G.
Date of Publication (YYYY-MM-DD):2010
Journal Abbrev.:The Astrophysical Journal
Issue / Number:1
Start Page:911
End Page:920
Audience:Not Specified
Abstract / Description:We present the first spatially resolved spectroscopic imaging observations of the 12CO (1-0) line emission in the central 2.5 kpc of the Seyfert 1 galaxy NGC 4151, obtained with the IRAM Plateau de Bure Interferometer (PdBI). Most of the cold molecular gas is distributed along two curved gas lanes about 1 kpc north and south of the active nucleus, coincident with the circumnuclear dust ring noted by previous authors. These CO arcs lie within the Inner Lindblad Resonance of the large scale oval bar and have kinematics consistent with those derived from neutral hydrogen observations of the disk and the bar. Two additional gas clumps are detected that show non-circular motion—one associated with the southern gas lane and the other lying ~600 pc north of the nucleus. Closer to the nucleus, no cold molecular gas is detected in the central 300 pc where abundant near-IR H2 line emission arises. This suggests that the H2 line emission is not a good indicator of a cold gas reservoir in NGC 4151 and that the H2 is likely photo-excited by the active galactic nucleus (AGN). The upper limit of the CO mass in the central 300 pc is sufficient to support the AGN activity at its current level for 107 yr. The total cold molecular mass detected by PdBI is 4.3 × 107 M sun. Finally, 3 mm continuum emission arising from the location of the AGN is detected with a flux of S 3 mm ~ 14 mJy and appears to be unresolved at an angular resolution of 2farcs8 (~180 pc). Based on observations carried out with the IRAM Plateau de Bure Interferometer. IRAM is supported by INSU/CNRS (France), MPG (Germany), and IGN (Spain).
Free Keywords:galaxies: individual: NGC 4151; galaxies: ISM; galaxies: kinematics and dynamics; galaxies: Seyfert
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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