Determining Peculiar Motions by Observing Cepheids at 3,000 km/s

Details Determining Peculiar Motions by Observing Cepheids at 3,000 km/s Determining Peculiar Motions by Observing Cepheids at 3,000 km/s

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7507z&link_type=abstract

HST Proposal ID #7507

Physics

Hst Proposal Id #7507 Cosmology

Scientific paper

We have used WFPC2 V-band observations to successfully detect Cepheids in the galaxy NGC 4603, which is believed to be in the Cen30 cluster at a redshift of 3,000 kms . These are the most distant Cepheids known. We propose to follow up this result in two ways. First, I-band observations of our field in NGC 4603 are required in order to determine the reddening and true distance modulus, All of our orbits in the previous cycle were dedicated to V-band observations in order to maximize the discovery of Cepheids and demonstrate the feasibility of the project. Second, we propose to observe a second galaxy in the Cen30 cluster to confirm our distance for this cluster derived from these observations. The Cen30 cluster is of particular interest because secondary distance indicators suggest it has a large peculiar velocity, but no mass distribution is found in IRAS or optical galaxy maps which can produce the inferred motion. Therefore, either there are mass distributions not traced by galaxies, or there are systematic problems with secondary distance indicators. Our preliminary result {awaiting further scheduled epochs and the I-band data proposed here} for NGC 4603 favors the hypothesis that the secondary indicators are correct. However, any single galaxy might be in the foreground of the cluster, so we propose to observe a second Cen30 spiral, NGC 4575.

Affiliated with

Also associated with

No associations

Rating

Determining Peculiar Motions by Observing Cepheids at 3,000 km/s 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 Determining Peculiar Motions by Observing Cepheids at 3,000 km/s, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Determining Peculiar Motions by Observing Cepheids at 3,000 km/s will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-895796