The kinematics of the gas and stars in dual AGNs is an ideal tool to study
the merger of galaxies. The rotating direction of the gas and stars around each
AGN will shed light on the pattern of merger. In the paper, we present a study
of the kinematics of the dual AGN, J0038+4128. From HST image, the two
nuclus (names as J0038+4128N and J0038+4128S) are resolved clearly and there
are dozens of konts near to the nucelus. Based on the long-slit spectroscopy,
we track the gas and stars rotation curves in this dual AGN and found that
the relative line-of-sight(hereafter,LOS) velocity of the two nucelus is about 150
km s?1. The LOS velocities of the emission lines and absorption lines around
each nuclei display same trend. This indicates that the gas and star disks are
rotating in the same direction in the ongoing merger.Co-rotating and counterrotating
system of stellar and gas disk represent different merger stage.In a dual
AGN, a co-rotating gas disk respect to stellar disk will always reveal in Earlymerger
stage. A dual AGN may counter-rotating its gas disk to stellar disk
in the later-merger stage.In the interaction region,Both of Halpha and [NII] 6583
emission lines show a inherent velocity drop, which could be affected by the
tidal interaction. The strong gravitational tidal interaction and the both gas rich
Predecessor galaxies should be responsibility for triggering the dual AGN.Five
knots just laying in the slit are specifically studied.The different velocity and
disconnected Knots Ak and Ik can infer that Knots Ak and Ik are tore apart and
threw away from center. The size of these knots is larger than that in normal
galaxies and show a lower log([NII]/Halpha ) indicates that there are ongoing star
formation in these knots.
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