Quasars Definition and 60 Threads

I found this article* about the behavior of quasar outflows in cosmology and how they can create a magnetic field. In section 2.1.4., the authors say that when a quasar produces a "wave" or an outflow, the material will be emitted with energy coming from both the quasar itself and the Hubble...

A few years ago I became intrigued by articles reporting the discovery of stars very close to the purported Big Bang; 400 million years seems an awful short time for a star to evolve. Then more recently the discovery of 2nd generation - hydrogen, carbon stars - in the same proximity, supposedly...

(Sorry for Length) 1. Homework Statement You have decided to use a CCD camera to check if a 16th magnitude quasar is variable. You can presume that all of the light of your quasar falls on one pixel. You know that a star with a magnitude of 0 would deliver 1 × 10^9 photons/second to one pixel...

Homework Statement Quasars arise when supermassive black holes swallow nearby gas, or even entire stars. Their masses are typically 10&7 solar masses, and their luminosities are typically around 10&39 W. Hide the children! Roughly how many stars must one of these monsters eat per year, in order...

In this paper https://arxiv.org/pdf/1108.6005.pdf It is claimed that 'Our results indicate that most of the models of space-time foam consistent with the holographic principle and, consequently, with black hole entropy, can be ruled out for most of the values of the fluctuation amplitude...

After searching elsewhere online I could not find any information about this thought and hope someone may offer some insight. Black holes seem to be generally discussed as having a single entrance point from the event horizon and down into its singularity. I am confused by how quasars have...

From deep galaxy counts, it is estimated that there are about 40 billion galaxies in the observable universe (not including probable multitudes of dwarf galaxies too faint to observe). Assuming that the mean age of these galaxies is 10 Gyr, and that each one goes through an AGN episode once...

It seems that for a long time astronomy and cosmology have been based on observation and then speculation. Those two tasks are both very hard on their own, with the observation costing tons of money to be able to produce effective telescopes and observation methods. Speculation is even harder...

A Quasar's luminosity is believed to be due to particle jets streaming from it, presumably on the direction of its poles. Reading some of Fred Hoyle's theories (and Halton Arp's) on redshifts, I wondered whether the jets could be forming so close to the "surface" of a black hole that...

https://www.sciencedaily.com/releases/2014/11/141119084506.htm Is this alignment spooky or is there some underlying pattern in the universe?

So what exactly are quasars made up of?

Could quasars be generating energy from fusion? I mean with all that material falling on it...

I would like a discussion to quantify just how much mass is ejected at the poles (including the mass equivalence of the photons) when jets form. In quasars the black hole presumably reaches over a Billion solar masses, where the mass is proportionate to the mass of the galaxy and is also related...

Homework Statement If you have a large telescope that has a 5 meter diameter with a field of view of 1 foot by 1 foot, and a small telescope with a diameter of 1 meter with a field of view of 1 degree by 1 degree, and your trying to take images of 30 quasars that has a limiting visual magnitude...

Do any quasars and blazars still exist today?

Both string theorists and loop quantum gravity theories have proposed that space-time may be something other than the perfectly smooth, perfectly local space of classical general relativity, which can potentially lead to path dependent phase alteration of light from a common source due to the...

http://news.nationalgeographic.com/2015/05/150315-quadruple-quasar-mystery-space-astronomy/National Geographic quoting Dr Hennawi, the lead author of the Science paper, says it is a ten million to one chance to find four quasars so close together. How much more unusual is it that in the first...

I had a lot of trouble in my early undergraduate career and had received some really bad grades. I retook a lot of courses and after 6 years, I am finally graduating with good marks in my third and fourth year courses and I believe I have an overall good understanding of undergraduate physics. I...

I have been thinking of how black holes help form galaxies and have come up with this idea. Now I will assume everyone who reads this knows about how black holes and quasars work. Now if you can imagine a quasar in the beginning, ie. Without the galaxy...

My understanding is that quasars are galaxies that are billions of light years away. Thus we see them as they were billions of years ago when they were much younger than our own galaxy & other galaxies nearby to us. The immense energy they emit is generated by matter falling into the central...

I am really interested what are quasars and how do they work.

Im wondering, if there is some theory, which is proposing that galaxies were formed from quasars? Or if not, are there some facts which are opposing such formation?

At what speed do quasars eject matter out the galaxy. I heard, I don't if I'm remembering correctly, that quasars can eject matter faster then the speed of light and I am very sure i got this information from the show "the universe" a couple years ago.

Having read the 'The bigger bang' book two times over, I am struck by the fact that the author seems to ask and answer the question of quasar energy emission without stating he is doing so or explaining why it would be wrong to assume he is doing so. In the beginning of the book, Lindsey...

A study is showing that higher redshift quasars emit more and more above their Eddington limit. How is this possible? Shouldnt this be causing the accretion disk to fly apart?

I have been doing some thinking about quasars and have been wondering. Are we able to sue the redshift of a quasar to find out the distance of a galaxy? If we know the redshift at a galaxy can't we just use Vrecession= (c*(λ-λo))/(λo), then substitute this value into Vrecession=Hubble's...

Okay, so this may be a little bit of a trivial question, but I've read conflicting information and found myself confused as a result. I've read from several sources (wikipedia, books) that GRB's are the most luminous events known to occur in our universe. However, I've also read that...

Is a quasar a one off phenomenon at the inception of a galaxy, or does a super massive black hole produce quasars repeatedly as a by-product when there is too much matter to be absorbed.

I recently read that the center of a quasar does not or almost doesn't experience time dilation, can anybody help me understand this more? The text didn't help much.

http://www.sciencedaily.com/releases/2005/01/050111115201.htm Please see this article. I've been trying to find the thread with 41 questions posted aces days ago. One of the questions was relating to high redshift objects like quasars appearing in near by galaxies. Someonevwanted a reference...

How a quasar beam can get out of a black hole if no light is suppose to be able to get out of the event horizon of a black hole. ? Is it because the beam is created outside of the event horizon ? From what I understand quasar is created because of excess of matter on the black hole correct me if...

Hey guys I am a bit new to the astronomy scene and am trying to learn as much as I can about space and the universe. One thing that has confused me is quasars (and then blazars). Exact definitions of these is hard to find online, pages I've found always just start going into radio waves and how...

I was reading about quasars, and what I got from it was that quasars are extremely far away (3 billion + light years according to wikipedia), they were common in the early universe, and they have a supermassive black hole in the center of it. My question is how did these quasars get such...

According to everything I've read and heard (as a non-scientist), nothing can come out of a black hole. However, on a couple of documentaries I've seen on the Nat Geo channel in the last week, the astronomers talk about quasars as being massive jets that come out of black holes, because the...

Here's the article http://news.discovery.com/space/no-time-dilation-for-distant-quasars.html So the distant quasar is more red-shifted than the closer one, which means the farther one is traveling at a higher velocity, makes sense. My thought is if the quasar is "riding" if you will...

I know that pulsars are Neutron stars that emit their energy through their poles, bit why do they emit it through their poles, and not their sides? And Quasars, I though that all mater that falls into a black hole never escapes, so how do we see the...''stuff'' leaving it?

On a paper published recently by Hawkins (not Hawking): Comments? Opinions? http://www.physorg.com/news190027752.html http://www3.interscience.wiley.com/journal/123345710/abstract?CRETRY=1&SRETRY=0

Why is it that Quasars don't red-shift? Any ideas or speculations? http://www.physorg.com/news190027752.html Surely all the measurements across all these quasars can't all be wrong. Is it possible that the Big Bang theory is wrong? Is it possible that the universe is not expanding? If...

Do any quasars presently exist in our universe? Or are all the quasars gone?

I have read on a NASA website amongst other places that "Many astronomers believe that Seyfert galaxies and high-energy quasars are basically the same type of objects, but we are simply viewing them differently". But on the same website it also says that "by measuring their redshifts, we find...

We know it is implausible that the local observable universe contains a near-balanced distribution of matter and antimatter because we fail to observe predicted anomalies of high-energy radiation brought about by spontaneous annihilation from matter-antimatter collisions on the borders of such...

As I understand it, the conclusion that our spatially flat universe is expanding at an accelerating rate is supported by observations of 'standard candles' (type S1a supernovae) which appear less bright than expected when their z exceeds about 0.3 --- . Robert Kirschner has discussed these...

It seems that there is overwhelming experimental evidence that at least some quasars must have significant intrinsic redshifts (as Arp has been suggesting for years). There is also some evidence from a gravitationally lensed quasar suggesting a significant intrinsic magnetic field. These...

SDSS is perhaps the most ambitious astronomical survey ever undertaken, and it has provided a wealth of new data. Unfortunately for cosmologists (or fortunately, if cosmologists are willing to re-group), some of the findings are quite inconsistent with their expectations. Scroll down to Nov 2...

Hi all, How to measure the tangential component of velocity of receding starsor quasars? I ask this because i think the velocity determined by observing the red shift will give only the radial component...won't Thnx for replying...

Hi all, How to measure the tangential component of velocity of receding starsor quasars? I ask this because the velocity determined by observing the red shift will give only the radial component... Thnx for replying...

Hi, people, Just to bump myself into the forum could someone address this question about Quasars The Hubble space telescope picks up light from these unimaginably distant energy sources called quasars, which came into being some1 billion years after the big bang or, about some 10/11 billion...

Can anyone tell me whether it's possible to measure the temperatures of Quasers from phenomenon such as redshift etc?? As quasers travel with speed comparable to that of light,so does the concept of relativistic temperature come into effect? Are there any research papers available on this?

I know I am way out of my league but I have a thought experiment concerning BHs and I am trying to fathom super massive BHs with the limited amount of time for them to form to create the farthest Quasars. In my thought experiment I envision a black hole not to be a point but the Planck length in...

I am just a layman who read that the farthest quasars (based on redshift) are about 13 billion light years away. Is that true? I also read that the age of the universe is less than 14 billion years and that the overall shape (from observations of background radiation) is that of a flat...