Statistics – Methodology
Scientific paper
Jul 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9477m&link_type=abstract
HST Proposal ID #9477
Statistics
Methodology
Hst Proposal Id #9477
Scientific paper
Masers surrounding the nucleus of the galaxy NGC 4258 have been used to derive a geometric distance to this galaxy from proper motions and accelerations of individual sources assumed to be in Keplerian orbits. This provides us with a unique opportunity to test the zero point of the Cepheid Period- Luminosity relation in specific, and the extragalactic distance scale in general. A Cepheid distance has also been determined to NGC 4258 by us following the exact methodology adopted by the HST Key Project on the Extragalactic Distance Scale. The two answers differ, with the maser distance being smaller by 12 We are proposing to use a third and totally independent means to assess the sense and significance of the difference that may need to be applied to the extragalactic distance scale. By using the tip of the red giant branch {TRGB} method we will obtain a Population II distance measurement to the maser galaxy NGC 4258 good to a precision of better than 10 Resolving this issue is important because if the maser distance is adopted and used to recalibrate the HST Cepheid Key Project distances, then the Hubble constant increases from H_o = 70 to 80 km/sec/Mpc. Both distance scales must be scrutinized and tested very closely before any recalibration takes place.
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