Optical variability of the NLS1 galaxy Ark 564 in 1987 2004

Details Optical variability of the NLS1 galaxy Ark 564 in 1987 2004 Optical variability of the NLS1 galaxy Ark 564 in 1987 2004

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006arep...50..708d&link_type=abstract

Astronomy Reports, vol. 50, Issue 9, p.708-713

Astronomy and Astrophysics

Astronomy

2

Pacs Numbers 98.54.Cm

Scientific paper

We present the results of our U BV R c I c photoelectric and CCD photometry of the NLS1 galaxy Ark 564 in 1987 2004. Between late 1997 and 2002, a slight increase in brightness was observed followed by a small but systematic decline until 2004. Ark 564 has a low variability amplitude, within 0.2m in the U BV R c I c bands. The galaxy’s spectral energy distribution at 3600 9000 Å is unlike those for Seyfert 1 (Syl) galaxies. A delay of the Ic flux relative to the B flux of about three days was found, which is in agreement with the standard disk model. This delay probably reflects the geometric size of the region that emits the observed continuum.

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