To add comments or start new threads please go to the full version of: Black Holes And Jets
PhysOrgForum Science, Physics and Technology Discussion Forums > Space > Space

Harry Costas
G'day from the land of ozzzzzzz

Reading through many papers I have come to the conclusion that not many know how a black Hole works and in some cases even question whether a black hole exists.

Maybe in this topic we can be opened minded.

Black Holes
http://filer.case.edu/sjr16/advanced/stars_blackhole.html
Types and Sizes of Black Holes

QUOTE
A black hole is classified by the only three properties that it possesses: Mass, Spin, and Magnetic Field.

Currently, there are only two recognized mass classes of black hole: Stellar and Supermassive. The stellar black holes are star-sized and range in the 10-100 solar mass range. The supermassive black holes are at the cores of - what appear to be - every large galaxy, including our Milky Way. These range in the millions to even billions of solar masses.

Intermediate black holes are hotly debated. There has been no universally-accepted proof as to their existence, and many doubt there to be a reasonable mechanism by which they would form.

The simplest black hole has no spin and no magnetic field. This is called a Schwarzschild black hole. A black hole that has a field but no spin is called a Reissner-Nordstrøm black hole. One that has both a magnetic field and spin is called a Kerr black hole.



I will add to this later. Darn I have to go and pick up the kids.


Harry Costas
G'day

Winding spiral arms reveal black hole mass
http://www.astronomy.com/asy/default.aspx?c=a&id=7018
K. Margiani
Hello Costas!

Black hole is driver of the Milky Way, remnant of the died parent star.

http://www.astro.virginia.edu/class/whittl...4/M1_MW_nuc.mpg
Harry Costas
G'day from the land of ozzzzzz

Hello margiani

You said

QUOTE
Black hole is driver of the Milky Way, remnant of the died parent star.


A black hole is an ultra dense compact matter nothing less nothing more. Its extreme density much denser than the nucleus of an atom, allows it to develope extreme electromagnetic and gravitational fields. It is not a remnant of a parent star or a dead star. It is part of a phase (Stage) that plays part in a recyling process. Millions of these compact bodies that we call stellar black holes form throughout the milky way and as they move towards the centre they merge and form bigger so called black holes and eventually form our main black hole being several million solar masses. All compact bodies form jets and eject matter. The monster black holes that create supper jets is directly related to the amount of matter sucked in.



K. Margiani
"monster" black holes never create supper jets. After merging of galaxies "monster" black holes create quasars and only "monster" quasar creates supper jets.
Sec
QUOTE (K. Margiani+Jun 8 2008, 06:08 AM)
"monster" black holes never create supper jets. After merging of galaxies "monster" black holes create quasars and only "monster" quasar creates supper jets.

Discovery is intellectual happiness? blink.gif - better change that sig' to "Ignorance is bliss".

laugh.gif
Harry Costas
Hello All

Margiani said

QUOTE
"monster" black holes never create supper jets. After merging of galaxies "monster" black holes create quasars and only "monster" quasar creates supper jets.


Mate you need to read up on quasars, so called black holes and jets.

Do a bit of research and if you cannot find the information I will post it.

Hello rpenner

Thank you for the links, they are great

This one is very special
http://apod.nasa.gov/apod/ap990128.html





K. Margiani
for open minds only.

I want to describe Merging (axial hit) of two old spiral galaxies. Each of them has Super Massive Black Hole (SMBH) in the centre. Merging can decay gravitational order of both galaxies. Stars with own planetary systems start fall down on the SMBH. Gravitated and exploded stars and planets create huge nuclear reactions around both SMBH. Huge nuclear reactions create huge nuclear wind from SMBH. Huge nuclear wind forms huge nuclear clouds. It means SMBH creates QUAZAR. Huge radiations of exploded stellar and planetary chemical elements from ultra dense nucleus of quasar are absorbing by same chemical elements of huge red-hot nuclear and molecular clouds surrounded the quasar. This is proof of socked forbidden lines formation in the spectrum. It means events around Centaurus A and 3c438 are results after huge hit between two quasars. Thus each big bang in the universe is event formed after huge hit between two quasars.
Harry Costas
G'day from the land of ozzzzzzzz


Margianni said

QUOTE
Thus each big bang in the universe is event formed after huge hit between two quasars.


Merging of quasars (collision of galaxies one or mutliple) is a very common process, bt in the scope of things is just a drop in an ocean of water. Not a big bang but a merging process that is part of a recycling process.

Keep an open mind. Knowing sometimes stops you from learning.

I know very little, and the more I read the more I find that I know very little. We are at the door steps of learning about the universe.
K. Margiani
All objects of the universe are participating in the universe events. Black holes, Quasars, galaxies, globular clusters, even stars, planets and nebulas are part of the recycling, renewing and evolution processes in the endless universe. Each of them has own mission in the evolution order.
Harry Costas
Hello Margiani

You said

QUOTE
All objects of the universe are participating in the universe events. Black holes, Quasars, galaxies, globular clusters, even stars, planets and nebulas are part of the recycling, renewing and evolution processes in the endless universe. Each of them has own mission in the evolution order.


Thats ok, now try to understand the workings of each part.


K. Margiani
Costas, thanks for order

I’ll do your order ASAP.
Harry Costas
Hello Margiani

Its not an order,,,,,,,,,,,,,,,,,,,,,,smile

Its what we all need to do, to understand the workings of anything.


Harry Costas
G'day from the land of ozzzzzzzzzzz



http://adsabs.harvard.edu/abs/1984RvMP...56..255B


QUOTE
Abstract

Powerful extragalactic radio sources comprise two extended regions containing magnetic field and synchrotron-emitting relativistic electrons, each linked by a jet to a central compact radio source located in the nucleus of the associated galaxy. These jets are collimated streams of plasma that emerge from the nucleus in opposite directions, along which flow mass, momentum, energy, and magnetic flux. Methods of using the observations diagnostically to infer the pressures, densities, and fluid velocities within jets are explained. The jets terminate in the extended radio components, where they interact strongly with the surrounding medium through a combination of shock waves and instabilities. Jets may expand freely, be confined by external gas pressure, or be pinched by toroidal magnetic fields. Shear flows are known to be Kelvin-Helmholtz unstable and thus may be responsible for some of the observed oscillation of jets about their mean directions and for creating the turbulence and shock waves needed to accelerate the relativistic electrons. Larger-scale bending may be caused by changes in the jet axis within the nucleus, gravitational interaction of the radio galaxy with a companion galaxy, or rapid motion of the source through dense intergalactic gas. The compact radio sources also exhibit a jet morphology and contain more direct clues as to the origins of jets; in particular, the variations sometimes observed imply bulk flows that are relativistic. It is widely believed that nuclear activity is ultimately ascribable to gas accreting onto a massive black hole. The accretion can proceed in several different fashions, depending upon whether or not the gas has angular momentum and whether or not the radiation emitted is sufficiently intense to influence the dynamics of the flow. Several distinct mechanisms for jet production in the context of black holes have been proposed. (Alternative mechanisms involving dense star clusters and massive spinning stars are also reviewed.) Supersonic jets may be collimated along the spin axis of a gas cloud surrounding the source of the lighter jet gas. Magnetic fields may be crucial in collimating jets, especially if they are wrapped around the jet by orbiting gas and can thereby collimate the outflow through the pinch effect. In fact, the spin energy of the black hole could also be extracted by magnetic torques, in which case the jet would contain electrons and positrons and carry a large electromagnetic Poynting flux. Statistical investigations of active galaxies also furnish valuable information on their nature and evolutionary behavior. The formation of particular kinds of sources appears to be correlated with environmental effects and cosmic epoch. In addition, the brightest compact radio sources on the sky, which probably involve relativistic motion, may be intrinsically faint objects beamed in our direction. There is now compelling evidence for the continuous fueling of extragalactic radio sources through jets emerging from the nucleus of the associated galaxy. The morphological classification of radio sources is interpreted in terms of the powers, speeds, and surroundings of jets. The ratio of the mass accretion rate to the mass of the hole may determine whether an active nucleus will be primarily a thermal object like an optical quasar or a nonthermal object like a radio galaxy. The authors outline a unified model of nuclear activity and assess what future progress may stem from observational developments (especially the proposed very long baseline array), experimental approaches (such as wind tunnel simulations), and theoretical studies (in particular, large-scale numerical hydrodynamical computing).
PhysOrg scientific forums are totally dedicated to science, physics, and technology. Besides topical forums such as nanotechnology, quantum physics, silicon and III-V technology, applied physics, materials, space and others, you can also join our news and publications discussions. We also provide an off-topic forum category. If you need specific help on a scientific problem or have a question related to physics or technology, visit the PhysOrg Forums. Here you’ll find experts from various fields online every day.
To quit out of "lo-fi" mode and return to the regular forums, please click here.