The Distance to NGC 2841: Improving the TF Calibration and Definitively Testing MOND

Details The Distance to NGC 2841: Improving the TF Calibration and Definitively Testing MOND The Distance to NGC 2841: Improving the TF Calibration and Definitively Testing MOND

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8322b&link_type=abstract

HST Proposal ID #8322

Astronomy and Astrophysics

Astronomy

Hst Proposal Id #8322 Clusters Of Galaxies And Lensing

Scientific paper

This proposal aims to measure a distance to the spiral galaxy NGC 2841 using Cepheid variables. NGC 2841 provides a unique opportunity to simultaneously probe three separate phenomenon in extragalactic astronomy: 1} It will provide the highest rotational velocity data point for the Cepheid based calibration of the I-band Tully-Fisher relation and thus will firmly determine if this relation experiences curvature or remains linear all the way out to high rotational velocities. 2} It has hosted two SN Ia events; both of which have good photometry {1957A and 1972R}- this significantly adds to the number of calibrators for the SN Ia distance scale; 3} If its distance can be shown to be significantly less than 19.5 MPC, then MOND can be definitively ruled out because NGC 2841 will require a value of a_o substantially in excess of the empirically determined "universal" value. The current estimated distances for NGC 2841 range from 9-20 Mpc. An accurate determination of this distance, based on HST detection and measurements of its Cepheids, will therefore have an important and distinctive impact in these three areas.

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