Abstract

Narrow-line Seyfert 1 galaxies (NLS1s) host low black hole masses (M_BH ≲ 10⁷M_⊙) and are accreting at high accretion rates. These properties make NLS1s ideal AGN to study the coupling between the accretion disks and hot corona by studyingUV and X-ray variability. Here we present UV and X-ray variability of the NLS1 1H 0707–495 which is well known for its relativistically broadened iron K and L lines. We found no obvious correlation between the UV and X-ray emission on light-crossing time, implying absence of significant reprocessed emission. The lack of reprocessing is most likely due to the strong bending of X-ray emission froma compact corona onto the innermost regions, giving rise to broadened iron lines but no illumination onto the intermediate/outer disk where reprocessed UV emission is expected. We also found X-ray spectral variability – spectral steepening with increasing X-ray flux, which cannot be due to the variations in the seed flux as the UV emission is not correlated with X-ray powerlaw shape. The observed spectral variability is most likely intrinsic to the hot Comptonizing corona.