Detection of faint broad emission lines in type 2 AGN – II. On the measurement of the black hole mass of type 2 AGN and the unified model

  • F. Onori
    1SRON Netherlands Institute for Space Research, Sorbonnelaan 2, NL-3584 CA Utrecht, the Netherlands
  • F. Ricci
    3Dipartimento di Matematica e Fisica, Università Roma Tre, via della Vasca Navale 84, I-00146 Roma, Italy
  • F. La Franca
    3Dipartimento di Matematica e Fisica, Università Roma Tre, via della Vasca Navale 84, I-00146 Roma, Italy
  • S. Bianchi
    3Dipartimento di Matematica e Fisica, Università Roma Tre, via della Vasca Navale 84, I-00146 Roma, Italy
  • A. Bongiorno
    4INAF – Osservatorio Astronomico di Roma, via Frascati 33, I-00044 Monte Porzio Catone, Italy
  • M. Brusa
    5Dipartimento di Fisica e Astronomia, Università di Bologna, viale Berti Pichat 6/2, I-40127 Bologna, Italy
  • F. Fiore
    4INAF – Osservatorio Astronomico di Roma, via Frascati 33, I-00044 Monte Porzio Catone, Italy
  • R. Maiolino
    7Cavendish Laboratory, University of Cambridge, 19 J. J. Thomson Avenue, Cambridge CB3 0HE, UK
  • A. Marconi
    8Dipartimento di Fisica e Astronomia, Università degli Studi di Firenze, Via G. Sansone 1, I-50019 Sesto Fiorentino, Italy
  • E. Sani
    10European Southern Observatory, Alonso de Cordova 3107, Casilla 19, Santiago 19001, Chile
  • C. Vignali
    5Dipartimento di Fisica e Astronomia, Università di Bologna, viale Berti Pichat 6/2, I-40127 Bologna, Italy

抄録

<jats:title>Abstract</jats:title> <jats:p>We report the virial measurements of the black hole (BH) mass of a sample of 17 type 2 active galactic nuclei (AGN), drawn from the Swift/BAT 70-month 14–195 keV hard X-ray catalogue, where a faint BLR component has been measured via deep NIR (0.8–2.5 μm) spectroscopy. We compared the type 2 AGN with a control sample of 33 type 1 AGN. We find that the type 2 AGN BH masses span the 5 &lt; log(MBH/M⊙) &lt; 7.5 range, with an average log(MBH/M⊙) = 6.7, which is ∼0.8 dex smaller than found for type 1 AGN. If type 1 and type 2 AGN of the same X-ray luminosity log($L_{\rm 14{\rm -}195}$/erg s−1) ∼ 43.5 are compared, type 2 AGN have 0.5 dex smaller BH masses than type 1 AGN. Although based on few tens of objects, this result disagrees with the standard AGN unification scenarios in which type 1 and type 2 AGN are the same objects observed along different viewing angles with respect to a toroidal absorbing material.</jats:p>

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