Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005pasj...57..861y&link_type=abstract
Publications of the Astronomical Society of Japan, Vol.57, No.6, pp. 861-869
Astronomy and Astrophysics
Astronomy
4
Galaxies: Active, Galaxies: Individual (Ngc 4258), Galaxies: Kinematics And Dynamics, Galaxies: Nuclei, Masers
Scientific paper
We monitored the velocities of high-velocity features for a H2O megamaser, NGC 4258, using the 45-m telescope of the Nobeyama Radio Observatory. The spiral shock model of maser disks predicts that the red-shifted features of observed maser spectra decelerate and the blue-shifted features accelerate for trailing arms. To confirm this model, we measured the velocity drift rates. Using the data of 1992-2005, the drift rate was detected to be ā = -0.036 ± 0.007 km s-1 yr-1 on the average for 10 red-shifted features. The drift rate of a blue-shifted feature was a = 0.20 ± 0.10 km s-1 yr-1. These results are consistent with a prediction of the spiral shock model. The pitch angles of the spirals were obtained to be overline{θp} = 2° ± 1° on the average for the red-shifted features and θp = 13° ± 7° for the blue-shifted feature from the measured drift rates.
Hirota Akihiko
Nakai Naomasa
Sato Naoko
Yamauchi Aya
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