Timeline for Are there automatic methods to locate (stellar and supermassive) black holes?
Current License: CC BY-SA 4.0
25 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jun 27, 2022 at 13:25 | comment | added | Alex | Neutron stars, the extremely dense cores of massive dead stars, spiraling toward each other or into a black hole can raise tidal waves in the oceans of heavy charged particles surrounding the neutron stars. Those tidal waves reveal themselves through regular flashes of electromagnetic radiation, which can serve as an early warning system for impending mergers, the researchers found. Such electromagnetic flares could become very early warning signs of NSBH (∼ 1 yr before merger) and BNS (∼ 10 yr before merger) mergers and tools to study neutron star oceans. arxiv.org/abs/2205.13541 | |
| Feb 16, 2022 at 17:03 | comment | added | James K | @alex: that would come under method 3 "Be clever" | |
| Feb 16, 2022 at 15:03 | comment | added | Alex | @Peter Erwin Now, with the help of NASA's Hubble Space Telescope, scientists have discovered an isolated stellar-mass black hole about 5,150 light-years away from Earth, in the direction of the bulge in the center of the Milky Way. "We now know that isolated black holes exist," Sahu said. "And they have masses similar to the black holes found in binaries. And there must be lots of them out there." | |
| Feb 2, 2022 at 19:54 | comment | added | Alex | @Peter Erwin The article thow suggests that PTA might detect the gravitational memory signal related to projected event - do you agree with that? | |
| Feb 2, 2022 at 16:14 | comment | added | Peter Erwin | @Alex “The only certain signal is gravitational waves, but the ponderous colliding masses would emit them at too low a frequency to be picked up by detectors such as the Laser Interferometer Gravitational-Wave Observatory, which is tuned to smaller mergers.” | |
| Feb 2, 2022 at 15:43 | comment | added | Alex | @Peter Erwin Will be the gravitational wave caused by below described event detected?science.org/content/article/… | |
| Sep 8, 2021 at 14:52 | comment | added | Alex | spaceaustralia.com/news/… | |
| Sep 3, 2021 at 11:58 | comment | added | Alex | sci-news.com/astronomy/… | |
| Aug 27, 2021 at 13:00 | comment | added | Daddy Kropotkin | @nicolopinci (I was motivated by Peter Erwin's comment above) | |
| Aug 27, 2021 at 12:47 | comment | added | nicolopinci | Thank you for this discussion, I am learning something new. @DaddyKropotkin has made a good point I think, since it looks like those methods are not valid for any black hole, so I will clarify this in the question. | |
| Aug 27, 2021 at 11:52 | comment | added | James K | see astronomy.stackexchange.com/questions/14019/… | |
| Aug 27, 2021 at 11:41 | comment | added | Alex | GW observation allows to "INFER" (NOT "discover") the existence, mass and distance of a black hole. | |
| Aug 27, 2021 at 9:54 | history | edited | James K | CC BY-SA 4.0 |
added 116 characters in body
|
| Aug 27, 2021 at 9:53 | comment | added | James K | Ok, this has gone on long enough and has drifted far from the answer. I've changed "located" to ""discovered"". A GW observation discovers the existence, mass and distance of a black hole, but not its location. | |
| Aug 27, 2021 at 1:50 | comment | added | Alex | @Daddy Kropotkin One might say that "dark matter" as well as "dark energy" at this point of knowledge are just two hypothetical concepts introduced to make the theories be in agreement with otherwise unexplainable observational facts... | |
| Aug 26, 2021 at 23:21 | comment | added | Daddy Kropotkin | @Alex You're making a semantic argument that has no physical content. Is a dark matter halo not an astronomical object? | |
| Aug 26, 2021 at 15:01 | comment | added | Alex | @Daddy Kropotkin Quoting from your last comment (capitalizing is mine): "...luminosity, radial velocity, spectroscopy etc... of an OBJECT are MEASURED..." In above case there exists already DISCOVERED ASTRONOMICAL OBJECT with some of it parameters being directly measured. My point is: one can't call the astronomical object, which existance is based only on inference as being DISCOVERED. | |
| Aug 26, 2021 at 14:31 | comment | added | Daddy Kropotkin | @Alex The discovery of the gravitational wave signal is at 5$\sigma$, but the source of the signal is inferred. But that is no different than how it works in electromagnetic astronomy, where luminosity, radial velocity, spectroscopy etc... of an object are measured and the object's type, mass, spin, etc... are inferred with models of stellar and galactic evolution which are far more theoretically uncertain than is pure general relativity. physics.stackexchange.com/questions/238782/… | |
| Aug 26, 2021 at 0:09 | comment | added | Peter Erwin | This doesn’t cover various methods used to measure supermassive black holes, which is what the OP’s reference to “one of Andrea Ghez’s talks” is about. | |
| Aug 25, 2021 at 14:57 | comment | added | Alex | @Daddy Kropotkin This distance estimation and constraint of the region with regards to black hole location are too vague to call this to be an "astronomical discovery". Besides, this method is not based on a direct astronomical observation but rather on the indirect inference from the Einstein's theory. | |
| Aug 25, 2021 at 14:38 | comment | added | Daddy Kropotkin | @Alex You are mistaken. Look at any LIGO/Virgo paper about reported compact coalescing events and you'll see they measure the distance to the source from Earth and they constrain the region on the Earth's sky to locate the direction the signal came from. | |
| Aug 25, 2021 at 13:44 | comment | added | Alex | IMHO, I would not call the method of gravitational waves capturing (in this case particular those which signal's match Einstein's mass predictions towards black hole(s) being the source of such gravitational waves) be termed as "discovery" (in the astronomical sense of this word) since this method doesn't has the capability to figure out the location of such black holes and their distance to the Earth. | |
| Aug 25, 2021 at 12:48 | vote | accept | nicolopinci | ||
| Aug 27, 2021 at 12:46 | |||||
| Aug 25, 2021 at 12:47 | comment | added | nicolopinci | Thank you very much! This answer my question. Would you suggest any source to explore those techniques more in depth? | |
| Aug 25, 2021 at 12:44 | history | answered | James K | CC BY-SA 4.0 |