Galaxy Dynamics at Very Large Radius using LyAlpha Absorption Lines

Details Galaxy Dynamics at Very Large Radius using LyAlpha Absorption Lines Galaxy Dynamics at Very Large Radius using LyAlpha Absorption Lines

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9378c&link_type=abstract

HST Proposal ID #9378

Physics

Hst Proposal Id #9378

Scientific paper

We propose to investigate the outer dynamics of the nearby spiral galaxy NGC1398 at very large galactocentric radii by using the kinematical information from Ly-alpha absorption lines in the spectra of 3 background UV-bright objects {two Seyferts 1 and one QSO}. It is a unique opportunity to have 3 UV-bright objects surrounding one single isolated spiral galaxy, and this will enable us to measure its disk rotation up to radii several times greater than what is possible in HI at 21cm, since the UV-bright objects lie at projected distances of 80 to 270 kpc. At these large radii we expect to observe the turn down from flat rotation, and be able to determine the size of the dark matter halo and hence measure the total mass and mass-to-light ratio of a spiral galaxy.

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