[ExI] First Picture of a Black Hole!

[Tomaz Kristan]

>  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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