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J/ApJ/691/228 Kinematics of PN in NGC 4697 (Mendez+, 2009)
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Beginning of ReadMe :J/ApJ/691/228 Velocities of PNe in NGC 4697 (Mendez+, 2009)
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Kinematics of planetary nebulae in the outskirts of the elliptical galaxy
NGC 4697.
Mendez R.H., Teodorescu A.M., Kudritzki R.-P., Burkert A.
<Astrophys. J., 691, 228-240 (2009)>
=2009ApJ...691..228M (SIMBAD/NED BibCode)
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ADC_Keywords: Radial velocities ; Planetary nebulae ; Magnitudes
Keywords: galaxies: elliptical and lenticular, cD - galaxies: individual
(NGC 4697) - galaxies: kinematics and dynamics - planetary nebulae:
general - techniques: radial velocities
Abstract:
We describe the implementation of slitless radial velocity
measurements of extragalactic planetary nebulae (PNs) with the 8.2m
Subaru telescope and its Cassegrain imaging spectrograph, Faint Object
Camera and Spectrograph (FOCAS). As a first application, we have
extended a previous search for PNs in NGC 4697 to larger angular
distances from its center. A total of 218 PNs were detected, and their
radial velocities were measured. We have added 56 new PN detections to
the existing sample of 535, observed previously with the ESO VLT +
FORS imaging spectrograph; 36 of these new 56 PNs are located at
angular distances larger than 230 arcsec from the center of NGC 4697.
We compare the new FOCAS velocities with the earlier FORS velocities,
for 158 of the 162 reobserved sources, finding good agreement. We now
have kinematic information extending out to five effective radii from
the center.
Description:
The slitless radial velocity method was described in Paper I (Mendez
et al. 2001ApJ...563..135M). The 8.2m Subaru telescope (Mauna Kea,
Hawaii) and its Cassegrain imaging spectrograph FOCAS observations
were made on the nights of 2004 May 12/13, 13/14, and 2005 May 11/12,
12/13, and 13/14. The 2004 nights were partly clouded. The first two
2005 nights were photometric, and the last one was affected by thin
cirrus.