Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...19713401r&link_type=abstract
American Astronomical Society, 197th AAS Meeting, #134.01; Bulletin of the American Astronomical Society, Vol. 33, p.719
Astronomy and Astrophysics
Astronomy
Scientific paper
Unlike the case of spiral galaxies, the mass distribution in the outer parts of elliptical galaxies is in general poorly known, owing to a paucity of suitable observational tracers. One effective observational approach exploits the kinematics of planetary nebulae (PNe). With much of their emission concentrated in the [O III] line at 5007 Å, these objects can be readily identified against the background light to large radii, and their velocities easily measured. Since the PNe are representative of the general stellar population of the galaxy, measurements of their velocities can be used to infer the dynamics and mass distribution of the galaxy as a whole. Using PNe around the giant Virgo Cluster galaxy NGC 4472 (M49) which were detected with narrow-band imaging, we have made follow-up spectroscopic observations using the WYFFOS/AUTOFIB2 multifiber spectrograph on the 4-m William Herschel Telescope. We present here the results of these observations, as well as an analysis of the galaxy's dynamics.
Arnaboldi Magda
Douglas Nigel G.
Kuijken Koen
Romanowsky Aaron J.
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