agn structure and unified models
DESCRIPTION
AGN structure and Unified models. Guido Risaliti. INAF – Osservatorio Astrofisico di Arcetri & Harvard-Smithsonian Center for Astrophysics. TODAY: Studying Complexity Luminosity, Spin, BH mass, Edd . ratio; BLR: density, cloud number, size, metallicity - PowerPoint PPT PresentationTRANSCRIPT
AGN structure and Unified modelsGuido Risaliti
INAF – Osservatorio Astrofisico di Arcetri & Harvard-Smithsonian Center for Astrophysics
M. Polletta;Urry & Padovani 1995
Unified models: History
Polarization
Masers
TODAY:
1) Studying ComplexityLuminosity, Spin, BH mass, Edd.
ratio;BLR: density, cloud number, size,
metallicityTorus: distance, composition
(dust/gas), covering factor
2) Are all the “ingredients” of the structure correct?
3) Any missing piece ?Outflows, multiple tori….
Ionization cones
TORUS: direct imaging
Greenhill et al. 2003Tristram et al. 2007Jaffe et al. 2004
Meisenheimer et al. 2008
TORUS: direct imaging
TORUS: dust reverberation mapping
Pott et al. 2010
(dusty) TORUS: clumpy structure
Nenkova et al. 2008a,b
Silicates absorption/emission
Clumpy torus: Variability of NH in Seyfert Galaxies
Risaliti, Elvis & Nicastro 2002
NH variable in 23/25 sources
Timescales from months to years
Clumpy absorberSub-parsec distance
Inner TORUS: BLR/dust free component
Maiolino et al. 2001a
Low dust/gas ratio
Maiolino et al. 2001b
Missing BLR absorption in quasars
Inner TORUS: BLR X-ray absorption
DNH > 1024 cm-2
DT~10 hoursDNH~1023 cm-2
DT~2 days
DNH~3*1023 cm-2
DT<15 days DNH~1023 cm-2
DT~20 hours
NGC 1365 NGC 4151
UGC 4203 NGC 7582
Bianchi et al. 2009Risaliti et al. 2010
Risaliti et al. 2009
Puccetti et al. 2007
Stratified BLR
Peterson et al. 2007
104 RS
Dusty torus + BLR: a possible structure
Complications: 1. At least two tori
Most local intermediate Seyferts are found in edge-on galaxies(and with NH~1022-1023 cm-2)Maiolino & Rieke 1995, Risaliti et al. 1999
Dust lanes observed
Complications: 1. At least two tori
1. Compact torus: BLR + hot dust scale (104-106 RG)
2. Dust lanes; 100pc – kpc absorbers
3. Compton-thick, pc-scale torus ? need for a C-thick reflector to explain reflection in some C-thin
AGN (NGC 5506, NGC 7582..) (e.g. discussion in Bianchi et al. 2009 on NGC 7582)
Complications: 2. missing BLR
Tran 2001
Bian & Gu 2009
Complications: 2. missing BLR
“naked” Seyferts: NGC 3147
Bianchi et al. 2009
Complications: 2. missing BLR
“naked” quasars: Q2131-427
Panessa et al. 2009
Complications: 3. how many BLR ?
Arav et al. 1998
From smoothness of observed lines:
at least 108 !
Cloud structure: comets?
Maiolino et al. 2010
104 RS
Complications: 4. stability
104 RS
STABILITY: Inflow / Outflow ?
Outflows: 1. the “common” and “weak” ones
UV: NGC 5548 (Crenshaw et al. 2009) X-rays: NGC 1365 (Risaliti et al. 2005)
Outflows: 2. the “strong” ones
Optical/UVBAL, z~2(Dunn et al. 2009)
X-rays,PDS 456(Reeves et al. 2009)
Outflows: phenomenological models
Outflows: phenomenological models
Outflows: physical models
Proga 2000
Large scale structure
NGC 5252: Tadhunter & Tsvetanov 1989
Large scale structure
Bianchi et al. 2010
Mrk 573: X-rays/[O III] Mrk 573: X-rays/Radio
Large scale structure
Bianchi et al. 2010
Mrk 573
Conclusions
- orientation-based unification useful, and basically correct
-(too) many free parameters within the standard unified picture-Many deviations & extra “ingredients”
- New observations reveal this complexity, but also allow us to understand more and more details of the structure of AGN
AGNs with nuclear H2O maser disksare NOT preferentially Compton thick
log NH (cm-2)
Zhang+ 06
Distribution of EW([OIII]) has no high-EW cut off, as expected with a torus aligned with the disk
Risaliti+2010 (poster)
Disk orientation: aligned with torus ?
Disk orientation: aligned with torus ?
Greenhill et al. 2009