Photometric observations of selected, optically bright quasars for Space Interferometry Mission and other future celestial reference frames - Astrophysics > Cosmology and Nongalactic AstrophysicsReport as inadecuate




Photometric observations of selected, optically bright quasars for Space Interferometry Mission and other future celestial reference frames - Astrophysics > Cosmology and Nongalactic Astrophysics - Download this document for free, or read online. Document in PDF available to download.

Abstract: Photometric observations of 235 extragalactic objects that are potentialtargets for the Space Interferometry Mission SIM are presented. Mean B, V, R,I magnitudes at the 5% level are obtained at 1 - 4 epochs between 2005 and 2007using the 1-m telescopes at Cerro Tololo Inter-American Observatory and NavalObservatory Flagstaff Station. Of the 134 sources which have V magnitudes inthe Veron and Veron-Cetty catalog a difference of over 1.0 mag is found for theobserved-catalog magnitudes for about 36% of the common sources, and 10 sourcesshow over 3 mag difference. Our first set of observations presented here formthe basis of a long-term photometric variability study of the selectedreference frame sources to assist in mission target selection and to support ingeneral QSO multi-color photometric variability studies.



Author: Roopesh Ojha, Norbert Zacharias, Gregory S. Hennessey, Ralph A. Gaume, Kenneth J. Johnston

Source: https://arxiv.org/







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