An Unusual Pan-STARRS Selected AGN

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

The Pan-STARRS telescope commenced regular science observations in May 2010. Since then it has performed a transient object search which has discovered numerous new supernovae. In addition the survey has indentified variable AGN. One such, named ID85, has displayed highly unusual properties. It brightened by several magnitudes with respect to data from SDSS (unfortunately no SDSS spectrum was taken). New optical spectra show it to have a redshift of 0.203, and to be very blue. However its optical emission lines are extremely narrow (few hundred km/s), but it is not a Seyfert 2. It appears to be an extreme example of a NLS1. Swift observations failed to detect it X-rays, indicating a very steep index of alpha OX. Over the past year its optical blue continuum has declined by about one magnitude, whereas its K-band (2.2 micron) flux has remained constant.
This poster summarises its properties, and comments on possible origins of the variability.

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