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X-shooter reveals powerful outflows in z~1.5 X-ray selected obscured QSOs | | M. Brusa
; A. Bongiorno
; G. Cresci
; M. Perna
; A. Marconi
; V. Mainieri
; R. Maiolino
; M. Salvato
; E. Lusso
; P. Santini
; A. Comastri
; F. Fiore
; R. Gilli
; F. La Franca
; G. Lanzuisi
; D. Lutz
; A. Merloni
; M. Mignoli
; F. Onori
; E. Piconcelli
; D. Rosario
; C. Vignali
; G. Zamorani
; | | Date: |
4 Sep 2014 | | Abstract: | We present X-shooter@VLT observations of a sample of 10 luminous, X-ray
obscured QSOs at z$sim1.5$ from the XMM-COSMOS survey, expected to be caught
in the transitioning phase from starburst to AGN dominated systems. The main
selection criterion is X-ray detection at bright fluxes (L$>=10^{44}$ erg
s$^{-1}$) coupled to red optical-to-NIR-to-MIR colors. Thanks to its large
wavelength coverage, X-shooter allowed us to determine accurate redshifts from
the presence of multiple emission lines for five out of six targets for which
we had only a photometric redshift estimate, with a 80\% success rate,
significantly larger than what is observed in similar programs of spectroscopic
follow-up of red QSOs. We report the detection of broad and shifted components
in the [OIII]$lambdalambda$5007,4959 complexes for 6 out of 8 sources with
these lines observable in regions free from strong atmospheric absorptions. The
FWHM associated to the broad components are in the range FWHM$sim900-1600$ km
s$^{-1}$, larger than the average value observed in SDSS Type 2 AGN samples at
similar observed [OIII] luminosity, but comparable to those observed for
QSO/ULIRGs systems for which the presence of kpc scale outflows have been
revealed through IFU spectroscopy. Although the total outflow energetics
(inferred under reasonable assumptions) may be consistent with winds
accelerated by stellar processes, we favour an AGN origin for the outflows
given the high outflow velocities oberved (v$>1000$ km s$^{-1}$) and the
presence of strong winds also in objects undetected in the far infrared. | | Source: | arXiv, 1409.1615 | | Services: | Forum | Review | PDF | Favorites | |
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