Presentation on theme: "QUASAR HOSTS ( Growing Galaxies with Monstrous Middles) Kim K. McLeod, Wellesley College “Hostesses” past and present: Frannie D’Arcangelo Melissa Rice."— Presentation transcript:
QUASAR HOSTS ( Growing Galaxies with Monstrous Middles) Kim K. McLeod, Wellesley College “Hostesses” past and present: Frannie D’Arcangelo Melissa Rice Rebecca 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 heart Galaxy: D=10^5 LY ~2x10^10 au M=10^12 M Sun Black Hole: R Sch =2GM BH /c^2 =3km(M BH /M Sun ) ~10au in quasar M BH >10^9M Sun
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! PG at 1.6um NICMOS 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!
Black hole v. spheroid mass—they know about each other! Haring & Rix 2003 The “Kormendy Relation” M bh =0.006M Gal
Black hole in the Milky Way’s center! From the fantastic speckle images by the team at MPE R. Genzel A. Eckart And guess what? M~3x10^6 M Sun 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