Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.246..324z&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Vol. 246, NO.2/SEP15, P. 324, 1990
Astronomy and Astrophysics
Astronomy
9
Scientific paper
Spectroscopic and photometric observations of the edge-on galaxy NGC 5084 are presented and discussed. The galaxy exhibits a very faint outer structure which is is almost straight in projection, but is tilted by ~5^deg^ with respect to the brighter, inner stellar disc. Stellar and gas rotation curves at different position angles are presented, as well as accurate CCD surface photometry in Gunn i waveband. A geometrical analysis of the galaxy component is conducted on PDS tracings from ESO and ESO/SRC Sky Atlas copies. It is suggested that the tilt between the above components is due to the warping of the main galaxy plane, with the gas confined to a ring occupying its outer edge. If this is so, the apparent misalignment is only due to the lack of matter at intermediate radii. A three-component galaxy model has been used to correct the stellar rotation curve for the effects of integration along the line-of-sight and asymmetric drift. The resulting curve is in good agreement with the H I results in the outer parts. From this model, a 3D mass and light distribution has been derived and hence the mass-to-light ratio at various radii. This ratio varies from ~19 M_sun_/L_sun_ in the inner disc, up to ~45 M_sun_/L_sun_ in the outskirts, and there is a possible central peak with M/L > 30 M_sun_/L_sun_. A massive, dark halo is required to explain the galaxy dynamics, which place NGC 5084 among the supermassive disc galaxies. The presence of this dark halo offers a mechanism that could stabilize the warped disc. The possible external origin of the warped disc is discussed.
Galletta Giuseppe
Madsen Claus
Zeilinger Werner W.
No associations
LandOfFree
NGC5084 - a Massive Disk Galaxy with a Tilted Ring does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with NGC5084 - a Massive Disk Galaxy with a Tilted Ring, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and NGC5084 - a Massive Disk Galaxy with a Tilted Ring will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1405693