Is the Compact HVC Toward Ton S210 Remnant Debris from the Formation of the Local Group?

Details Is the Compact HVC Toward Ton S210 Remnant Debris from the Formation of the Local Group? Is the Compact HVC Toward Ton S210 Remnant Debris from the Formation of the Local Group?

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9415s&link_type=abstract

HST Proposal ID #9415

Computer Science

Hst Proposal Id #9415

Scientific paper

There is a fortuitous coincidence in the positions of the quasar Ton S210 and a compact ionH1 high velocity cloud on the sky that makes it possible to test the hypothesis that such clouds are extragalactic entities located in the Local Group. The HVC toward Ton S210 has H I 21 cm emission properties similar to those of isolated compact HVCs suspected of being Local Group clouds. It has recently been detected in O VI absorption by FUSE, which suggests that either there is hot gas associated with the collapse of the cloud or that the HVC is interacting with a hot, tenuous Galactic halo or Local Group medium. We propose to observe the HVC in absorption against the smooth ultraviolet continuum of Ton S210 with HST/STIS. To answer the question posed in the proposal title, we will combine the STIS observation with extant FUSE and H I 21 cm data to determine the metallicity, elemental abundances, and ionization properties of the HVC. To date, such information has been difficult to obtain for all but a few HVCs, and this is the first time such an opportunity has been available for a compact HVC. The results of this study will bear directly upon the issues of the locations of compact HVCs, the ionization conditions of HVCs detected in O VI absorption, and the possible influence HVCs might have on the chemical evolution of galaxies.

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