Hot dust, warm dust and star formation in NLS1s

Rivay Mor*, Hagai Netzer

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review


We present the results of a detailed investigation of the near- to far-infrared continuum emission of a large sample of NLS1s and BLS1s. We fitted the AGN-produced SEDs of 51 NLS1s and 64 BLS1s using a three-component model in order to define the main emission components. Our model consists of: a clumpy torus, dusty narrow-line region clouds, and very hot pure-graphite dust clouds. The AGN SEDs were obtained by subtracting the star formation contribution to the mid-infrared (MIR) emission. The MIR AGN SEDs of NLS1s and BLS1s are found to be very similar regardless of AGN luminosity. We present the covering factors of the dusty components, for all sources, and compare it with the AGN intrinsic properties. We find that the hot dust component is essential to explain the (rest) NIR emission, and that it is consistent with clouds of pure graphite dust composition located between the dust-free broad line region and the "standard" torus. The covering factor of this component is correlated with the AGN bolometric luminosity and anti-correlated with the normalized accretion rate.

Original languageEnglish
JournalProceedings of Science
StatePublished - 2011
Event2011 Narrow-Line Seyfert 1 Galaxies and their Place in the Universe, NLS1 2011 - Milano, Italy
Duration: 4 Apr 20116 Apr 2011


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