Monitoring the variability of active galactic nuclei from a space-based platform

Details Monitoring the variability of active galactic nuclei from a space-based platform Monitoring the variability of active galactic nuclei from a space-based platform

Aug 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994spmt.nasa...73p&link_type=abstract

In NASA. Ames Research Center, Astrophysical Science with a Spaceborne Photometric Telescope p 73-83(SEE N95-14499 03-90)

Astronomy and Astrophysics

Astrophysics

Active Galactic Nuclei, Brightness, Continuums, Digital Techniques, Photometry, Variability, Background Noise, Costs, Telescopes

Scientific paper

Detailed monitoring of AGN's with FRESIP can provide well-sampled light curves for a large number of AGN's. Such data are completely unprecedented in this field, and will provide powerful new constraints on the origin of the UV/optical continuum in AGN's. The FRESIP baseline design will allow 1 percent photometry on sources brighter than V approximately equals 19.6 mag, and we estimate that over 300 sources can be studied. We point out that digitization effects will have a significant negative impact on the faint limit and the number of detectable sources will decrease dramatically if a fixed gain setting (estimated to be nominally 25 e(-) per ADU) is used for all read-outs. We note that the primary limitation to studying AGN's is background (sky and read-out noise) rather than source/background contrast with a focused telescope and by longer integrations. While we believe that it may be possible to achieve the AGN-monitoring science goals with a more compact and much less expensive telescope, the proposed FRESIP satellite affords an excellent opportunity to attain the required data at essentially zero cost as a secondary goal of a more complex mission.

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