Table 1: H2O maser observations.
\begin{displaymath}{
\begin{tabular}{l c c r c c r @{--}l r c c l @{\ } l}
\hlin...
...0 & 19 &1.1& 0105 & $\ge$100 & B; B99 \\
\hline
\end{tabular}}\end{displaymath}
a LINER = Low Ionization Nuclear Emission Line Region; RL = Radio Loud; Sy = Seyfert; ULIRG = UltraLuminous InfraRed Galaxy.
b Infrared flux densities taken from the IRAS Point Source Catalog (Fullmer & Lonsdale 1989) or from NED were converted into far infrared luminosities following the procedure outlined by Wouterloot & Walmsley (1986); H0 = 75 km s-1 Mpc-1; the values given are the logarithms of the infrared luminosity in solar units.
c Month (first two digits) and year (last two digits).
d Notes concerning X-ray absorbing hydrogen column densities: X-ray telescope: A: ASCA; B: BeppoSAX; C: Chandra; X: XMM-Newton; References: Arm04: Armus et al. (2004); B99: Bassani et al. (1999); Bra04: Braito et al. (2004); Cle02: Clements et al. (2002); Delu04: Deluit (2004); Gua04: Guainazzi et al. (2004a); Gua05: Guainazzi et al. (2005a); Mai03: Maiolino et al. (2003); Ris99: Risaliti et al. (1999); Ris00: Risaliti et al. (2000); Ris03: Risaliti et al. (2003).
e NGC 2992: a revived AGN according to Gilli et al. (2000); NGC 4939: a source varying from Compton-thick to Compton-thin, see Gua05; NGC 5005: a possibly misclassified Compton-thin source from Gua05; Arp 220: the column density from Cle02 refers to the western nucleus and is highly uncertain.

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