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