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QUASAR HOSTS(Growing Galaxies with
Monstrous Middles)
Kim K. McLeod, Wellesley College
“Hostesses” past and present:Frannie D’ArcangeloMelissa RiceRebecca Stoll
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Galaxy Gallery
Spirals, taken by ASTR 206
Elliptical
Merger
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Spectra compared (visible light)
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KKM’s Top Five Quasar Factoids
• They’re HONKIN’ LUMINOUS
• They’re visible across the visible Universe
• They were most common 10Gyr ago• They are voracious feeders (but must obey the Eddington limit)
• They’re broadband emitters
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Model of a quasar’s heartGalaxy:
D=10^5 LY ~2x10^10 au
M=10^12 MSun
Black Hole:
RSch=2GMBH/c^2 =3km(MBH/MSun)~10au in quasar
MBH>10^9MSun
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Quasar nuclei are sexy…
Quasar host galaxies are…well, hard to see!
Problems are
CONTRAST
(nucleus outshines the whole galaxy)
and
RESOLUTION (quasars are veeeery distant)
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HST—Our first clear look!
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“Which of these things is not like the other?”
K. McLeod/Sky and Telescope
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YOUR TAX $$ AT WORK!
PG0947+396 at 1.6umNICMOS arrays on HST 2.4m … and the Steward 2.3m
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McLeod’s Thesis: What the Near-IR can do for YOU!
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NICMOS image,
in the RAW
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Mrk876…and little buddy!
K. McLeod/Scientific American
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Hubble Space Telescope
NICMOS images
OOOOH, AAAAAH!
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(z<0.4)
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Black hole v. spheroid mass—they know about each other!Haring & Rix 2003
The “Kormendy Relation”
Mbh=0.006MGal
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Black hole in the Milky Way’s center!
From the fantastic speckle images by the team at MPE
R. Genzel A. Eckart
http://www.mpe.mpg.de/www_ir/GC/
And guess what?
M~3x10^6 MSun
Is a perfect fit to the “Kormendy relation”
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Growing up with a monster in the middle
Kauffmann & Haehnelt 2000
Hierarchical structure formation: black holes are fueled, and galaxies grow, through mergers
Z=0.4
Z=3
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Hosts at higher redshift
H K(z=4)
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Taking the big step to high-z: Do PANIC!
Bechtold and McLeod have been using Magellan (6.5m) and Gemini (8m) to image z=4 quasars in the near-IR
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Thanks Rebecca!
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PANIC at z=4: Stay tuned
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For now…
The End