A Catalog of [O III] 5007 Photometric Standards In The Virgo Cluster Region

Astronomy and Astrophysics – Astronomy

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The number of sources that can be used for the calibration of narrow band photometry is small compared to that of broadband photometry.Narrowband photometry of point sources is important for a variety of reasons, from the search for intracluster planetary nebulae to understanding the star-formation history of the universe (e.g.,through Lyman alpha-emitting galaxies). There will be a need in the next several years for more photometric narrow-band standard stars with the next generation of surveys (e.g., with the Large Synoptic Survey Telescope,or the One-Degree Imager). Thus, more standard stars (both primary and secondary) for narrow band need to be identified and cataloged. Over the last three years, we have been collecting narrow-band [OIII]5007 images of portions of the Virgo Cluster, along with broad-band V and R. The data were collected at the 2.3m Wyoming Infrared Observatory and the Kitt Peak 0.9m.We present our [OIII]5007 photometry calibration of point sources in the Virgo Cluster region, most of which are intracluster planetary nebula. For greater utility of this catalog, we also cross-calibrate our photometry with the Sloan Digital Sky Survey ugriz system. In addition, we take advantage of the long basline of our observatios to find time-variable sources (rejected from the standard star catalog) such as background quasars, supernovae, novae, and micro-lensing events.

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