QUASAR HOSTS ( Growing Galaxies with Monstrous Middles) Kim K. McLeod, Wellesley College...
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Transcript of QUASAR HOSTS ( Growing Galaxies with Monstrous Middles) Kim K. McLeod, Wellesley College...
QUASAR HOSTS(Growing Galaxies with
Monstrous Middles)
Kim K. McLeod, Wellesley College
“Hostesses” past and present:Frannie D’ArcangeloMelissa RiceRebecca Stoll
Galaxy Gallery
Spirals, taken by ASTR 206
Elliptical
Merger
Spectra compared (visible light)
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
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
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)
HST—Our first clear look!
“Which of these things is not like the other?”
K. McLeod/Sky and Telescope
YOUR TAX $$ AT WORK!
PG0947+396 at 1.6umNICMOS arrays on HST 2.4m … and the Steward 2.3m
McLeod’s Thesis: What the Near-IR can do for YOU!
NICMOS image,
in the RAW
Mrk876…and little buddy!
K. McLeod/Scientific American
Hubble Space Telescope
NICMOS images
OOOOH, AAAAAH!
(z<0.4)
Black hole v. spheroid mass—they know about each other!Haring & Rix 2003
The “Kormendy Relation”
Mbh=0.006MGal
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”
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
Hosts at higher redshift
H K(z=4)
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
Thanks Rebecca!
PANIC at z=4: Stay tuned
For now…
The End