[ExI] First Picture of a Black Hole!

Tomaz Kristan protokol2020 at gmail.com
Wed Apr 10 15:56:12 UTC 2019

>  4000000 million

Should be 4000000. Sorry for the typo.

On Wed, Apr 10, 2019 at 5:30 PM Tomaz Kristan <protokol2020 at gmail.com>

> >  because it is about 1000 times more massive.
> Yeah, but Sagittarius is 2000 times closer. Per unit of mass therefore
> 4000000 million times more luminous. 4000 times more luminous in absolute
> terms.
> Sagittarius should be the most "luminous"  black hole for us, just as the
> Sun is the most luminous star for us.
> On Wed, Apr 10, 2019 at 4:34 PM John Clark <johnkclark at gmail.com> wrote:
>> On Wed, Apr 10, 2019 at 9:54 AM <spike at rainier66.com> wrote:
>> > COOL!
>>> I am amazed that it is asymmetric and the thermal spectrum is so
>>> non-uniform.
>> It looks asymmetric because the matter in the accretion disk is moving
>> very close to the speed of light and as it orbits some of it is going
>> toward us and some is going away so one side looks brighter than the other.
>> The inner edge of the bright part comes from the photosphere, the last
>> place where light can stably orbit and has a radius of 1.5 times
>> the Schwarzschild event horizon, however because gravity is so strong we
>> are able  to see the back side of the Black Hole too so it works out
>> that the dark part in the center of the picture is 2.6 times the radius of
>> the event horizon. To the limits of measurement it looks exactly how
>> Einstein said it should, it would have been even more exciting if it didn't.
>> I assume they chose to image M87 instead of the Black Hole in the center
>> of our own galaxy because it is about 1000 times more massive.
>>  John K Clark
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> --
> https://protokol2020.wordpress.com/

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