Massive Black Holes as explanation of Galaxy formation

[maddog]

To all,

 

I just saw last night on Science Channel (hope you get that) -- part of the Discovery

Channel Network; an awesome show on Massive Black Holes.

 

There seems to be in the last five years or so (I must been asleep and missed it), on the

discovery that most galaxies have Massive Black Hole at the centers. The method used

to capture the data (spectroscopy, doppler shift of radial velocities of nearby stars) made

a lot of sense.

 

What really gave me that WOW! feeling (if not Whoaw!) was what is now thought that these

Massive Black Holes were primordial (i.e. were there when the galaxy formed) and were

what promoted star production. This is in a sense saying we wouldn't be here were it

not for Black Holes, especially the massive one at galactic centers.

 

How Black Holes induce star production is how they found a correlation between the

mass of a the galactic center Black Hole and Sigma (average radial velocity of stars at

the edge of the galaxy). [Thought: this may be evidence for Gravity Waves]

 

I started thinking, this would make sense that Elliptical galaxies do not seem to be local

and are only far away. So as a galaxy ages, like an ice skater pulling its arms would

speed up Sigma. Doing so would then flatten out the galaxy.

 

So in the show that because of the Blandford-Znajek Jets induce a current flow in the

surrounding gas -- pushing it out away from the Black Hole shutting off its feeding source.

This makes them go eventually quiescent. So a lot of what didn't make sense of Galactic

Astrophysics now does.... Kewl!!! :o :hyper: :D :hihi: :smilingsun:

 

maddog

 

ps: I decided to create a new thread rather the relate this to the already overlong and

laden "Bang/No-Bang" thread. Start fresh -- a new lease on life. :D ;) :)

[Pluto]

G'day from the land of ozzzzz

 

"I will buy that for a dollar"

 

I love the subject of black holes and compact objects.

 

I'll be back

 

As for star formation the jets from black holes form part of the evolving galaxy or galaxies.

[maddog]

"I will buy that for a dollar"

I love the subject of black holes and compact objects.

I'll be back

As for star formation the jets from black holes form part of the evolving galaxy or galaxies.

Ok... ?

I loved the subject of BH as well since I was in High School when the news first broke.

 

From the show, the jets as they grew in intensity became the switch that turns of the

feeding of a Black Hole.

 

maddog

[Pluto]

G'day maddog

 

You said

 

From the show, the jets as they grew in intensity became the switch that turns of the

feeding of a Black Hole.

 

What make you say that?

 

If the feeding stops where is the matter coming from to form the jet and the matter within?

 

I was just looking over M87

 

a great image of jets is from M87

 

http://hubblesite.org/newscenter/archiv ... et&x=7&y=5

 

and

 

Very Long Baseline Array Reveals Formation Region of Giant Cosmic Jet Near a Black Hole

 

http://hubblesite.org/newscenter/archiv ... 3/image/a/

[maddog]

What make you say that?

I was on the show. The scientist there said it.

If the feeding stops where is the matter coming from to form the jet and the matter within?

The accretion disk of the Black Hole (on both accounts).

I was just looking over M87

a great image of jets is from M87

The show mentioned M87 as the best example with jets from the BH.

 

maddog

[Pluto]

G'day maddog

 

What you say is very common and most papers would say that.

 

When I look at the evolution and form of galaxies they are directly related to the activity and size of the central nucleon.

 

This suggest to me that the Nucleon alters it size and mass to back feed and reform the galaxy and other galaxies. The only place that it can get matter from is from the core.

 

A combination from the both the disc and the core maybe the way to go.