Enhanced star formation in Narrow Line Syfert 1 galaxies

Elonora Sani, Dieter Lutz, Guido Risaliti, Hagai Netzer, Lugi Gallo, Benny Trakhtenbrot, Eckhard Sturm, Thomas Boller

Research output: Contribution to journalConference articlepeer-review


We present new Spitzer mid-IR spectroscopy of local NLS1s. We detect strong AGN continuum in all and clear PAH emission in 70% of the sources. The PAH luminosity spans three orders of magnitude, from ∼ 1039 to ∼ 1042 erg/s, providing strong evidence for intense ongoing star formation in the circumnuclear regions of NLS1s. We constructed NLS1 and BLS1 subsamples to compare them in various ways. The comparison shows a clear separation according to FWHM such that objects with narrower broad Hβ lines are the strongest PAH emitters. We test this division in various ways trying to remove biases due to luminosity and aperture size. We find that star formation activity around NLS1 AGN is larger than around BLS1 of the same AGN luminosity. The above result seems to hold over the entire range of distance and luminosity. Moreover, the star formation rate is higher in low black hole mass and high L/LEdd systems indicating that black hole growth and star formation are occurring simultaneously.

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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