Mathematics – Logic
Scientific paper
Oct 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...196.6207b&link_type=abstract
American Astronomical Society, 196th AAS Meeting, #62.07; Bulletin of the American Astronomical Society, Vol. 32, p.1285
Mathematics
Logic
3
Scientific paper
We have studied the cosmological motion of a sample of 40 SN Ia, whose distances have been carefully determined, and corrected for reddening. The redshifts of the sample range from 3000-30,000 km/sec. Our best estimates show that the bulk of the SN Ia are at rest in the frame defined by the cosmic background radiation; i.e. , the reflex motion of the Milky Way in the SN frame reproduces the CMB dipole with significant accuracy. The bulk flows in this frame are typically 200+-200 km/sec. Most of the signal comes from the sample between 3000 and 15000 km/sec. At higher redshifts the precision of the SN Ia distances (typically 10%) are insufficient to detect typical pecular motions (our signal become dominated by noise). The ``convergence depth" and scale of these motions appeards to be about 10.000 km/sec. These results are at variance with the large bulk motions measured by Lauer and Postman (1994) and Hudson et al (1999). Our motions and scale appear to be consistent with cosmological simulations of CDM, which predict the graviational accelerations of typical observers given the expected distribution of matter in the universe, when scaled by the abundance of rich clusters. This research was carried out as part of the 2000 Research Experiences for Undergraduates Program at CTIO, funded by the National Science Foundation.
Bonacic Axel
Phillips Marcia
Schommer Robert A.
Suntzeff Nicholas B.
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