Re: Question Galactic Supernova


John Bailey wrote:
On Thu, 14 Dec 2006 04:56:49 GMT, "Robert Karl Stonjek"
<stonjek@xxxxxxxxxxxxxx> wrote:

Not all Galaxies are pretty little pinwheels. Some are duds - they wobble
about and no doubt collapse, maybe after a collision with another galaxy or
whatever.

A galaxy that collapses in on itself must explode, I would have thought, as
all that material trying to crowd into an ever smaller space causes heat and
expansion.

Is there such a thing in Astronomy as a Galactic Supernova and what is the
correct terminology for it?


Perhaps the terminology is Active Galactic Nucleus (AGN) although the
terminology: QSO (Quasi Stellar Object) may also apply.

As noted in another response, your description doesn't mention either
black holes or conservation of angular momentum. Both play a role in
the evolution of a galaxy. Almost all galaxies have a black hole at
their center. Some have gobbled more star matter than is contained in
the milky way. Their consumption is limited by the law of
conservation of angular momentum with the result that the end game
includes a donut or disk of accreted matter. The Urry article also
indicates another interesting phenomenon--two collimated jets,
perpendicular to the plane of the torus, beaming energy away from the
center.

jets-Observed for our own galaxy
in the 80s.
Black holes at galactic centers are protons,
and will decay just as fast (never).
AGNs are excited galaxies which are growing
their accretion discs into Quasars, which
will be radiated.
Galaxy Model for the Atom
http://users.accesscomm.ca/john



http://xyz.lanl.gov/abs/astro-ph/0312545
"Based on nearly 20 years of detailed investigations of active
galaxies, a unification paradigm has emerged in which active galactic
nuclei share certain fundamental ingredients." from: AGN Unification:
An Update by C. Megan Urry

and

http://xyz.lanl.gov/abs/astro-ph/0611675
"The 2QZ optical QSO survey indicates that luminous QSOs are
relatively short-lived, and it has recently been shown that the
observed bolometric luminosity density from all AGN and its evolution
can be reproduced if black holes grew coevally with their galaxies,
implying but not requiring a causal link between galaxy growth and
black hole growth." from Observational links between AGN evolution and
galaxy growth by Miller.

Tons of material on this topic at:
http://xyz.lanl.gov/find/astro-ph/1/ti:+agn/0/1/0/all/0/1

.

Relevant Pages

  • Daily Report #4727
    ... Imaging of Local Lyman Break Galaxy Analogs: ... properties remarkably similar to high-redshift Lyman Break Galaxies ... terms of size, SFR, surface brightness, mass, metallicity, kinematics, ... AGNs with Intermediate-mass Black Holes: ...
    (sci.astro.hubble)
  • Daily Report #4743
    ... The Strong Lensing Legacy Survey ... SLACS, GOODS, etc.} are producing spectacular results for galaxy ... intermediate mass range candidates {between galaxies and clusters} ... AGNs with Intermediate-mass Black Holes: ...
    (sci.astro.hubble)
  • Quasars quash star formation in Active Galactic Nuclei (Forwarded)
    ... surrounding galaxy. ... Westoby studied the properties of light from 360,000 galaxies in the local ... Universe to understand the relationship between accreting black holes, ... The study finds that gas ejected during the quasar stage of AGN snuffs out ...
    (sci.astro)
  • Quasars quash star formation in Active Galactic Nuclei (Forwarded)
    ... An ambitious study of active and inactive galaxies has given new insights ... into the complex interaction between super-massive black holes at the heart ... stars in galaxy centres and the evolution of the galaxies as a whole. ... The study finds that gas ejected during the quasar stage of AGN snuffs out ...
    (sci.space.news)
  • NASA Galaxy Hunter: Huge Black Holes Stifle Star Formation
    ... NASA Galaxy Hunter: Huge Black Holes Stifle Star Formation ... likely it was to have young stars. ... Technology in Pasadena; Dr. Susan Neff of NASA's Goddard ...
    (sci.astro)