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          Institute: MPI für Radioastronomie     Collection: Publikationen des MPI für Radioastronomie     Display Documents

ID: 11206.0, MPI für Radioastronomie / Publikationen des MPI für Radioastronomie
Discovery of water vapor megamaser emission from Mrk 1419 (NGC 2960): An analogue of NGC 4258?
Authors:Henkel, C.; Braatz, J. A.; Greenhill, L. J.; Wilson, A. S.
Date of Publication (YYYY-MM-DD):2002-11
Title of Journal:Astronomy & Astrophysics
Journal Abbrev.:Astron. Astrophys.
Issue / Number:2
Start Page:L23
End Page:L26
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:Water vapor emission at 22 GHz is reported from the nucleus of the LINER galaxy Mrk 1419 (NGC 2960). Single-dish spectra of the maser source show properties that are similar to those seen in NGC 4258, namely (1) a cluster of systemic (V similar to V- sys) H2O features, (2) two additional H2O clusters, one red- and one blue-shifted with respect to V-sys, (3) a likely acceleration of the systemic features (dV/dt = 2.8 +/- 0.5 km s(-1) yr(-1)), and (4) no detectable velocity drifts (<1 km s(- 1) yr(-1)) in the red- and blue-shifted features. Interpreting the data in terms of the paradigm established for NGC 4258, i.e. assuming the presence of an edge-on Keplerian circumnuclear annulus with the systemic emission arising from the near side of its inner edge, the following parameters are derived: V-rot = 330-600 km s(-1), R &SIM; 0.13-0.43 pc, binding mass M &SIM; 10(7) M., and mass density inside the disk ρ &SIM; 10(9) M. pc(-3). With the galaxy being approximately ten times farther away than NGC 4258, a comparison of linear and angular scales (the latter via Very Long Baseline Interferometry) may provide an accurate geometric distance to Mrk 1419 that could be used to calibrate the cosmic distance scale.
Free Keywords:galaxies : active; galaxies : individual : Mrk 1419 (NGC 2960; UGC 05159); galaxies : ISM; galaxies : nuclei masers; radio lines : galaxies
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Radioastronomie
External Affiliations:Max Planck Inst Radioastron, Hugel 69, D-53121 Bonn, Germany; Max Planck Inst Radioastron, D-53121 Bonn, Germany; Natl Radio Astron Observ, Green Bank, WV 24944 USA; Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA; Univ Maryland, Dept Astron, College Pk, MD 20742 USA
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