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Anisotropy in the Hubble constant as observed in the HST extragalactic distance scale key project results
McClure, M. L.; Dyer, C. C.
Based on general relativity, it can be argued that deviations from a uniform Hubble flow should be thought of as variations in the Universe's expansion velocity field, rather than being thought of as peculiar velocities with respect to a uniformly expanding space. The aim of this paper is to use the observed motions of galaxies to map out variatio…
ConvPhot: A profile-matching algorithm for precision photometry
Santini, P.; Fontana, A.; Grazian, A. +1 more
We describe in this paper a new, public software for accurate "PSF-matched" multiband photometry for images of different resolution and depth, that we have named ConvPhot, of which we analyse performances and limitations. It is designed to work when a high resolution image is available to identify and extract the objects, and colours or variations…
On the effect of emission lines on UBVR photometry
Skopal, A.
We investigate the effect on the U, B, V, RC and RJ magnitudes of the removal of emission lines from a spectrum. We determined Δ m corrections from the ratio of fluxes with and without emission lines, transmitted from the object through a photometric filter. An exact and simplified approach for operative use was applied. The …