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WEEK 7 IMAGES & INFORMATION ON ACTIVE GALACTIC NUCLEI & GRAVITATIONAL LENSING

http://www.astr.ua.edu/keel/agn/spectra.gif
Spectra from various types of AGN

http://www.astr.ua.edu/keel/agn/vary.gif
Light curves of 2 Seyferts and BL Lacertae, showing variability of Luminosity

http://antwrp.gsfc.nasa.gov/apod/ap001204.html
Seyfert galaxy image.

http://www.astr.ua.edu/keel/agn/seyferts.html
Gallery of Seyferts, visible light imaging.

http://antwrp.gsfc.nasa.gov/apod/ap020309.html
Quasar gallery from HST

http://www.astr.ua.edu/keel/agn/qsoevol.html
Distribution of quasars vs. redshift

http://www.sdss.org/news/releases/19981208.qso.img7.html
Spectrum of H alpha forest for redshift 5 quasar.

http://antwrp.gsfc.nasa.gov/apod/ap030126.html
H "forest" at z = 3 (9 b year) based on Lyman Alpha forest for distant quasar.

http://antwrp.gsfc.nasa.gov/apod/ap010905.html
Quasar with jets, image from radio.

http://antwrp.gsfc.nasa.gov/apod/ap001010.html
Einstein cross gravitation lens of distant quasar.

http://apod.gsfc.nasa.gov/apod/ap981211.html
Three pix of quasars, with one having redshift of 5, or lookback time of 15 billion years.

http://apod.gsfc.nasa.gov/apod/ap980409.html
Elliptical galaxy is host to a quasar, with gravitational distortion from nearby galaxy.

http://apod.gsfc.nasa.gov/apod/ap971206.html
HST gallery of quasars, with most showing evidence of interacting galaxies.

http://apod.gsfc.nasa.gov/apod/ap971019.html
NGC4261, a double radio source in Virgo, 100 MLY distant. Shows central engine region in optical light, with argument of collision few hundred million years ago. Disk diameter = 800 ly.

http://oposite.stsci.edu/pubinfo/pr/1998/14/b.html
HST infrared view of NGC 5128 (Centaurus A), about 10 million LY distant . Compare Figure 16-10, page 389, which also shows and X-ray image of the nucleus and jet. Centaurus A results from collision of smaller spiral galaxy with large elliptical.

http://oposite.stsci.edu/pubinfo/PR/2000/22/index.html
Diagram summarizing HST findings on SMBH mass versus host galaxy mass, with argument that SMBHs grew along with the galaxy, rather than being formed first.

http://apod.gsfc.nasa.gov/apod/ap980330.html
Einstein ring of 2 galaxies in perfect alignment.

http://apod.gsfc.nasa.gov/apod/ap950711.html
Einstein cross of quasar behind massive galaxy, at 2 times 3 yr apart, showing effect of stars in foreground galaxy.

http://apod.gsfc.nasa.gov/apod/ap000423.html
Lensing of distant blue ring-like galaxy by galaxy cluster (1.5 billion ly distant) CL0024+1654. These data have been analyzed to infer the distribution and amount of dark matter associated with the cluster – see astronomy newsnotes in S&T July 1997, page 18.

http://science.nasa.gov/headlines/y2002/08feb_gravlens.htm
Story about first stars in the universe, in this case clusters brightened by lensing.

http://antwrp.gsfc.nasa.gov/apod/ap040217.html
The most recent (Feb. 2004) highest red-shift galaxy image, assisted by gravitational lensing - redshift about 7, around 750,000 years after the beginning of the universe, lookback time about 13 billion years.  You can read the full text of the press release from the Hubble site:  http://hubblesite.org/newscenter/newsdesk/archive/releases/2004/08/text/