The Velocity Field from Type Ia Supernovae Matches the Gravity Field from Galaxy Surveys

摘要

We compare the peculiar velocities of nearby Type Ia supernovae (SNs) with those predicted by the gravity fields of full-sky galaxy catalogs. The method provides a powerful test of the gravitational instability paradigm and strong constraints on the density parameter. For 24 Type Ia SNs within 10,000 km s~-1, we find that the observed Type Ia SN peculiar velocities are well modeled by the predictions derived from the 1.2 Jy IRAS survey and the Optical Redshift Survey (ORS).