Mid-Infrared Spectral Properties of IR QSOs

Details Mid-Infrared Spectral Properties of IR QSOs Mid-Infrared Spectral Properties of IR QSOs

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1059..117x&link_type=abstract

RELATIVISTIC ASTROPHYSICS: 5th Sino-Italian Workshop on Relativistic Astrophysics. AIP Conference Proceedings, Volume 1059, pp.

Astronomy and Astrophysics

Astrophysics

Spectroscopy And Spectrophotometry, Quasars, X- And Gamma-Ray Telescopes And Instrumentation, Supernova Remnants, Galactic Center, Bar, Circumnuclear Matter, And Bulge, Astronomical Observations, Galaxy Groups, Clusters, And Superclusters, Large Scale Structure Of The Universe

Scientific paper

We analyse mid-infrared (MIR) spectroscopic properties for 19 ultra-luminous infrared quasars (IR QSOs) in the local universe based on the spectra from the Infrared Spectrograph on board the Spitzer Space Telescope. The MIR properties of IR QSOs are compared with those of optically-selected Palomar-Green QSOs (PG QSOs) and ultra-luminous infrared galaxies (ULIRGs). The average MIR spectral features from ~5 to 30 μm, including the spectral slopes, 6.2 μm PAH emission strengths and [NeII] 12.81 μm luminosities of IR QSOs, differ from those of PG QSOs. In contrast, IR QSOs and ULIRGs have comparable PAH and [NeII] luminosities. These results are consistent with IR QSOs being at a transitional stage from ULIRGs to classical QSOs. We also find the correlation between the EW (PAH 6.2 μm) and outflow velocities suggests that star formation activities are suppressed by feedback from AGNs and/or supernovae.

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