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Title: Astronomy/Galaxies/Active Galactic Nuclei - Quasars - Bill Keel's WWW Gallery - Active Galaxies and Quasars Quasars and Active Galactic Nuclei
The_Cause_of_the_Characteristics_of_Quasars_(QSOs) Quasars (QSOs) are an illusion created by gravity lensing of photons from the opposite jet by a huge mass within the quasar.

Frequently_Asked_Questions_About_Quasars Part of an FAQ site that evolved from an exchange of e-mail messages with middle school science students.

Laser_Stars_-_Quasars Quasars are not black holes, they are laser stars within our galaxy.

When_Did_the_First_Cosmic_Structure_Form? Contains press release about the impact of quasars within various galaxies. Includes photos. (November 19, 1996)

Acoustic_material_property_tables Specialty Engineering Associates

ISO_9613 attenuation of sound during propagation outdoors.


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Bill Keel's WWW Gallery - Active Galaxies and Quasars

Quasars and Active Galactic Nuclei

Quasars and their kin remain among the most fascinating andmysterious of cosmic phenomena. This collection provides an introductionto the whole subject of active galactic nuclei. It started as theWWW version of a slide set produced for the AstronomicalSociety of the Pacific; this is still available as 35mm slides in their online catalog. (I don't get royalties for this, but the ASPis always a worthy recipient of your business). Newcomers maywant to start with an introduction,note how many colleagues have contributed,or check for an unfamiliar term in the glossary. Since the initialimage set, I've added a few more images, often driven by something thatwas especially useful in the classroom. New: An essay on quasar astronomy after forty years, being theDirector's Cut of an article first written for Astronomy magazine. The list below points to images and graphics with detailed captions.In each case, click on the image for a bigger (and often more legible) version.

General aspects:

Comparing optical spectra of various classes of AGN, The broadband spectrum of Markarian 421 from 20 cm to 1 TeV Variability of active nuclei in the radio, ultraviolet,and X-ray domains

Seyfert galaxies:

A gallery of Seyfert galaxies HST closeups of Seyfert nuclei The broad-band emission spectrum of NGC 4151 A wide view of NGC 1275 and its gaseous filaments An HST view of the enigmatic nucleus of NGC 1275 Finding the hidden active nucleus of IC 5063 in the infrared Interactions between jets and gas in NGC 4151 The radio jet and obscuring torus in NGC 1068 The hidden nucleus of NGC 1068 revealed by polarization Color image of the nearby Seyfert galaxy NGC 1068 Comparison of Seyfert and non-Seyfert nuclei in HST images

Radio galaxies:

Radio structures of radio galaxies HST closeups of nearby radio galaxies HST images of high-redshift radio galaxies in the early Universe The blowtorch jet of NGC 6251 The jet of M87 The nucleus and central mass in M87 Optical jets in four radio galaxies The nearby powerful radio galaxy Cygnus A The nearby radio galaxy Centaurus A The inner and outer parts of the radio galaxy M87

Quasars:

A typical quasar: PKS 1117-248 The jet of 3C 273 The gravitationally lensed double quasar 0957+561 An HST view of the Einstein Cross 2237+030 The evolution of quasars with cosmic time Anomalous QSO/galaxy associations and the redshift controversy Quasars as lighthouses: the Lyman alpha forest at low and high redshifts The absorbing galaxy seen in front of 3C 196 Quasar host galaxies from HST Superluminal motion in 3C 279 The hidden quasar nucleus in the ultraluminous infraredgalaxy IRAS 09104+4109

Usage and reproduction:

Want to make copies of these for use in teaching? Feel free with appropriateacknowledgements - that's what they're here for. Plan to use themcommercially or otherwise make money? That's a bit different - take it up withASP director Alex Filippenko, since they're handling the distribution ofthe original 35mm slides andcan use all the financial gain they can get. And if you do use thesefor classes or presentations, I'd appreciate your dropping me a note -I'll feel more motivated next time around if I know that they're actually beingused out there.Bill Keel's home page | UA Astronomy image collection | UA Astronomy Last updates: November 2002 keel@bildad.astr.ua.edu
 

Quasars

and

Active

Galactic

Nuclei

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