refining the radius – luminosity relationship for active galactic nuclei
DESCRIPTION
Refining the Radius – Luminosity Relationship for Active Galactic Nuclei. Misty Bentz The Ohio State University October 19, 2006 Collaborators: Brad Peterson, Kelly Denney, Rick Pogge, Marianne Vestergaard. Talk Outline. • Review of Radius — Luminosity Relationship - PowerPoint PPT PresentationTRANSCRIPT
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Refining the Radius–Luminosity Relationship
for Active Galactic Nuclei
Misty BentzThe Ohio State University
October 19, 2006
Collaborators: Brad Peterson, Kelly Denney, Rick Pogge, Marianne Vestergaard
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Talk Outline
• Review of Radius—Luminosity Relationship
• Host-galaxy starlight images
• New BLR radii from reverberation-mapping
• Summary and future plans
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Radius—Luminosity Relationship
Kaspi, S. et al. 2000 ApJ, 533, 631
Long lags, some not well constrained
Bright, nearby galaxies with faint AGNs and substantial starlight
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HST Imaging Program
Cycle 12 SNAP Program
• 14 objects (12 Seyferts, 2 PG quasars)
• ACS HRC camera, F550M filter
• set of 3 exposures (120s, 300s, 600s) for each object
Goal – Measure host galaxy contribution to luminosity
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Examples: Aperture Geometry
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Examples: Galfit 2-D Image Decompositionsfit
sresiduals
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Image Decompositions, cont…fit
sresiduals
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PSF Subtractions
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Bentz, M. C., et al. 2006, ApJ, 644, 133
Revised Radius—Luminosity Relationship
Excluded Points:
NGC 3516, NGC 7469,IC 4329A: awaiting HST imaging
NGC 4051, NGC 3227: significant nuclear structure & reddening
PG 2130+099: suspicious lag
NGC 4151
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NGC 4151τcent = 6.6 +/- 0.9 d σline = 2680 +/- 64 km s-1
MBH = 4.57 +/- 0.52 x 107 M☼
(Bentz, M. C., et al. 2006, ApJ, in press)
NGC 4593 τcent = 3.76 +/- 0.76 days σline = 1547 +/- 53 km s-1
MBH = 9.6 +/- 2.0 x 106 M☼
(Denney, K. D., et al. 2006, ApJ, in press)
New Reverberation Mapping ProgramSpring ’05 Program – Remeasure Hβ Lag Time
6 targets: 2 varied substantially, 1 marginally
See poster by Kelly Denney
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HST Imaging Program #2
Cycle 14 GO Program
• 4 Seyferts:NGC3516, NGC4593,
NGC7469, and IC4329A
• Same observational setup as before
• Same techniques employed
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New monitoring program Fall ‘06
HST Cycle 15 Program: ACS HRC imaging of last 17 objects
HST imagingJuly ‘06
New monitoring program Spring ‘07
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Implications• R-L relationship holds for 5 orders of magnitude• low luminosity objects have masses ~3x previous estimates• significant outliers can be expected to have physical differences that separate them from the typical population
R-L relationship now diagnostic tool