Timeline for How do we detect a black hole?
Current License: CC BY-SA 4.0
14 events
| when toggle format | what | by | license | comment | |
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| Dec 9 at 11:55 | comment | added | candied_orange | @PeterErwin no but your "edge on" explanation is. Please read what I'm saying again. | |
| Dec 9 at 11:52 | comment | added | Peter Erwin | @candied_orange I'm sorry, but you seem to be rather confused about quasars and AGN in general. (What on earth do you mean by "the gun"?) No, an accretion disk (and accompanying dusty torus) is not the same as "a flat piece of iron".) | |
| Dec 8 at 16:28 | comment | added | candied_orange | @PeterErwin that aspect explanation could be applied to galaxies or a flat piece of iron. The gun has a far more intense focus than can be explained simply by looking at it’s surface at an angle. | |
| Dec 8 at 15:23 | comment | added | Peter Erwin | @candied_orange It’s an accretion disk, so it has an intrinsic directionality. If you see it close to face-on, you see all the light, including from the very bright, hot inner region; if you see it close to edge-on, you mostly don’t see the inner region (the disk is not infinitely thin, and there is evidence for somewhat thicker, dust toruses outside but aligned with the accretion disks). | |
| Dec 8 at 13:23 | comment | added | candied_orange | @PeterErwin that argument fails to explain the directionality of the gun. All you're saying is that things glow when they get hot. Sure, but a hot iron doesn't care where you stand when you look at it. Why do quasars? | |
| Dec 8 at 9:57 | comment | added | Peter Erwin | @candied_orange Quasars and other active galactic nuclei produce light primarily via thermal emission from gas orbiting in an accretion disk around the black hole. The gas is heated by friction (gas at smaller radii orbits faster than gas at larger radii); gas at smaller radii is hotter. While there are other emission mechanisms involved, it is mostly not "accelerating charged particles". | |
| S Nov 16 at 7:52 | history | suggested | Paŭlo Ebermann | CC BY-SA 4.0 |
The "stars move around them" only works for lager black holes.
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| Nov 16 at 7:38 | comment | added | candied_orange | You can also find them in the form of Quasars. Rather then just watching material fall in this black hole forms an electromagnetic gun by accelerating charged particles as they spiral in. Accelerating charged particles will make them emit electromagnetic radiation perpendicular to the spiral. If that happens to be pointing at you a black hole can actually be the cause of one of the brightest lights in the sky. | |
| Nov 16 at 1:24 | review | Suggested edits | |||
| S Nov 16 at 7:52 | |||||
| Nov 15 at 15:49 | comment | added | Suraj Gavhale | Yes, gravitational lensing can also show the presence of a black hole even if it is not actively emitting radiation. | |
| Nov 15 at 15:30 | comment | added | Barmar | How about gravitational lensing of objects behind the black hole? | |
| Nov 15 at 0:41 | vote | accept | Luka | ||
| S Nov 14 at 16:40 | review | First answers | |||
| Nov 14 at 17:20 | |||||
| S Nov 14 at 16:40 | history | answered | Suraj Gavhale | CC BY-SA 4.0 |