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Studies of Extragalactic Planetary Nebulae with VLT+FORS: Detection, Photometry and Slitless Radial Velocities of 535 PNs in the Flattened Elliptical Galaxy NGC 4697

Published online by Cambridge University Press:  26 May 2016

R. H. Méndez ,
A. Riffeser ,
R. P. Kudritzki ,
M. Matthias ,
K. C. Freeman ,
M. Arnaboldi ,
M. Capaccioli  and
O. Gerhard
R. H. Méndez
Affiliation:
Munich University Observatory, Germany Institute for Astronomy, Univ. of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822, U.S.A
A. Riffeser
Affiliation:
Munich University Observatory, Germany
R. P. Kudritzki
Affiliation:
Institute for Astronomy, Univ. of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822, U.S.A
M. Matthias
Affiliation:
Munich University Observatory, Germany
K. C. Freeman
Affiliation:
Mt. Stromlo and Siding Spring Observatories, Australia
M. Arnaboldi
Affiliation:
Osservatorio Astronomico di Capodimonte, Italy
M. Capaccioli
Affiliation:
Osservatorio Astronomico di Capodimonte, Italy
O. Gerhard
Affiliation:
Osservatorio Astronomico di Capodimonte, Italy

Extract

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We describe a procedure for the efficient measurement of large quantities of PN radial velocities (RVs) in early-type galaxies, using the Focal Reducer and Spectrograph (FORS) at the Cassegrain foci of the ESO Very Large Telescope. The PNs are detected using the classic on-band/off-band filter technique. The radial velocity is obtained by measuring and calibrating the displacement of a PN image on the CCD produced by the insertion of a grism in the light path. Since no slits are used, it is possible to measure RVs for all the detected PNs, irrespective of their number and distribution in the field. All the images needed to find the PNs and measure their brightness and RVs can be collected in just one observing run, without the complicated preparation procedures typical of multi-object slit spectroscopy. The RVs have errors of about 40 km/s.

Type
Part VIII: Planetary Nebulae as Galaxy Probes
Information
Symposium - International Astronomical Union , Volume 209: Planetary Nebulae: Their Evolution and Role in the Universe , 2003 , pp. 641
Copyright
Copyright © Astronomical Society of the Pacific 2003