|WikiProject Astronomy / Astronomical objects||(Rated Start-class, Mid-importance)|
|WikiProject Physics||(Rated Start-class, Low-importance)|
Can GRS 1915+105 really be claimed as the "the heaviest of the stellar black holes so far known in the Milky Way Galaxy"?
- The mass of the galactic center black hole, Srg A*, has been measured to be about 3.5×106 solar masses, far beyond the ~100 solar mass limit for a star. It is also clearly an AGN, though lately inactive. On both these counts it seems to be excluded from the stellar black hole category, although it and all AGN likely were originally born as stellar-mass BHs that later grew by accretion and coalescence. Wwheaton (talk) 20:31, 17 October 2008 (UTC)
Rotation 1150 times per second?
Please correct me if I'm wrong, but how can a black hole have a finite rotation frequency? I always understood that all the mass is in a singularity (infinitely small), which will therefore rotate infinitely fast (and thus have a finite angular momentum, which is conserved). Rotation can in my understanding only be measured at a distance, but at the event horizon there is nothing that really moves, it's only the gravity field directed towards the center of the black hole. Can anyone explain this? EmilTyf (talk) 00:11, 30 April 2009 (UTC)
- Good question! It would probably have to be something like the period of the last stable orbit (which depends on the hole's angular momentum), but I am just guessing. Let's watch for an expert opinion. Wwheaton (talk) 22:16, 30 April 2009 (UTC)
Hello fellow Wikipedians,
I have just modified one external link on GRS 1915+105. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:
- Added archive https://web.archive.org/web/20120507004507/http://www.cosmosmagazine.com/node/873 to http://www.cosmosmagazine.com/node/873
When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.
You may set the
|checked=, on this template, to true or failed to let other editors know you reviewed the change. If you find any errors, please use the tools below to fix them or call an editor by setting
|needhelp= to your help request.
- If you have discovered URLs which were erroneously considered dead by the bot, you can report them with this tool.
- If you found an error with any archives or the URLs themselves, you can fix them with this tool.
If you are unable to use these tools, you may set
|needhelp=<your help request> on this template to request help from an experienced user. Please include details about your problem, to help other editors.
meaning of its denomination
The first paragraph goes like: ...and "105" is declination in units of 0.1 degree (i.e. its declination is 10.5 degrees).
But that's obviously wrong. The declination of GRS 1915+105 is +10° 56' 44". This reads 10 degrees 56 minutes (of arc) and 44 seconds (of arc), which is approximately 10+56/60 = 10.9 degrees. --22.214.171.124 (talk) 09:19, 12 February 2017 (UTC)