Discovery of Water Maser Emission in Five AGN and a Possible Correlation Between Water Mase.pdfVIP

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Discovery of Water Maser Emission in Five AGN and a Possible Correlation Between Water Mase.pdf

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Discovery of Water Maser Emission in Five AGN and a Possible Correlation Between Water Mase

a r X i v : a s t r o - p h / 0 6 1 0 0 6 0 v 1 3 O c t 2 0 0 6 Discovery of Water Maser Emission in Five AGN and a Possible Correlation Between Water Maser and Nuclear 2? 10 keV Luminosities Paul T. Kondratko, Lincoln J. Greenhill, James M. Moran Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138, USA pkondrat@cfa.harvard.edu ABSTRACT We report the discovery of water maser emission in five active galactic nuclei (AGN) with the 100-m Green Bank Telescope (GBT). The positions of the newly discovered masers, measured with the VLA, are consistent with the optical posi- tions of the host nuclei to within 1σ (0.′′3 radio and 1.′′3 optical) and most likely mark the locations of the embedded central engines. The spectra of three sources, 2MASX3327383, NGC6264, and UGC09618NED02, display the characteristic spectral signature of emission from an edge-on accretion disk with maximum orbital velocity of ～ 700 km s?1, ～ 800 km s?1, and ～ 1300 km s?1, respectively. We also present a GBT spectrum of a previously known source MRK0034 and interpret the narrow Doppler components reported here as indi- rect evidence that the emission originates in an edge-on accretion disk with orbital velocity of～ 500 km s?1. We obtained a detection rate of 12% (5 out of 41) among Seyfert 2 and LINER systems with 10000 km s?1 vsys 15000 km s ?1. For the 30 nuclear water masers with available hard X-ray data, we report a possible re- lationship between unabsorbed X-ray luminosity (2? 10 keV) and total isotropic water maser luminosity, L2?10 ∝ L 0.5±0.1 H2O , consistent with the model proposed by Neufeld and Maloney in which X-ray irradiation and heating of molecular accretion disk gas by the central engine excites the maser emission. Subject headings: galaxies: active — galaxies: individual (2MASX3327383, NGC6264, UGC09618NED02, IRAS03355+0104, SBS0927+493, MRK0034, NGC3393, NGC5495, VIIZW073, IC0184, AM2158-380NED02) — galaxies: Seyfert — ISM: m