Arp102B: An ADAF and a Torus

About This Presentation

Title:

Arp102B: An ADAF and a Torus

Description:

R. Chary, Arp102B, Xi'an Oct 06. 6 /12. H2 lines detected but offset ... R. Chary, Arp102B, Xi'an Oct 06. 10 /12. NIR Spectroscopy: Rodriguez-Ardila et al. 2006 ... – PowerPoint PPT presentation

Number of Views:42

Avg rating:3.0/5.0

Slides: 13

Provided by: rangara

Category:

more less

Transcript and Presenter's Notes

Title: Arp102B: An ADAF and a Torus

1
Arp102B An ADAF and a Torus ?

Ranga-Ram Chary
Spitzer Science Center, Caltech

2
Introduction Observations

Arp102B at a distance of 105 Mpc, E0, double
peaked Ha, radio-loud. SMBH108 M?. NH3E21 cm-2,
?1.6, no Fe Ka (Eracleous et al.)
Keck imaging at 12 and 18 microns (Ho, Scoville,
Becklin). Seen as a single unresolved source at
12 microns, sizelt0.6.
Spitzer IRS spectroscopy with SL (R100), SH, LH
(R600) between 5-37 microns (part of Spitzer
Teachers Education Program)
Spitzer IRS Peak-up on target providing coarse
photometric calibration with 5 accuracy

3
SL and SH spectra of Arp 102B
4
The Broadband SED Weak variability evidence
Keck data 2000
F???-1.2
5
A Comparison with NGC4258x3
Infrared luminosity is about the same as X-ray
luminosity but x10 higher than UV Fnu?nu-1.2 vs
Fnu? nu-1.4 for NGC4258 L/LEdd2-6E-3 vs L/Ledd
for 1E-4 for NGC4258 Radio spectral index
consistent with alphalt-0.25 (thermal is
alpha-0.4)
Thermal electron distribution
NGC4258 x30 Non-thermal electron distribution ?
6
H2 lines detected but offset
7
What is powering the emission ?

OIV/NeII0.2 and FeII/OIV0.86 indicate a
starburst
But no PAH present and no silicate..
NeII/SiIII2.3 and NeIII/ArIIgt3.1 which
is out of the starburst regime.
Implies mostly photoionization but 20-30 from
slow shocks
Broadband SED consistent with self-Comptonized
synchrotron emission around a geometrically thick
accretion flow.

8
And the H2 emission ?

Offset from systemic velocity by 500-1000 km/s
Not due to wavelength calibration which is O(100)
km/s but dont have other lines in order to
check.
107 M? of molecular gas in a ring at 1 pc radius
at a T450K ? Or is it just redshifted emission
like the He I at 1.083 microns ?

9
2-3 pc
Geometrically thick ADAF ?
100 Million M? Black hole
Molecular H2 torus Hot Little star-formation Littl
e dust 107 M?
Double peaked Halpha from the outer disk
10
NIR Spectroscopy Rodriguez-Ardila et al. 2006
FeII
H2
FeII
11
Rodriguez-Ardila et al. 2006 Strong HeI, SIII,
FeII, SII, H2
12
X-ray spectral analysis Eracleous et al. 2003

Write a Comment

User Comments (0)