[ExI] First Picture of a Black Hole!

John Clark johnkclark at gmail.com
Thu Apr 11 11:39:01 UTC 2019

On Wed, Apr 10, 2019 at 11:00 PM Stuart LaForge <avant at sollegro.com> wrote:


> * > As John pointed out their angular widths should be about almost equal
> at 5:4 for SgrA* vs M-87*. While there is a lot of dust between us and
> SgrA*, that shouldn't affect meters-wide radiowaves.*

Meter-wide waves couldn't give you the resolution required even with a
telescope the size of the Earth, they used millimeter and sub-millimeter

John K Clark

> The radio jet pointing directly at us would make the picture of SgrA*
> just look like a bright blotch of light with no dark "shadow" apparent
> so it would not look much like a "black" hole. Even in the picture
> M-87* they have, the shadow is not quite as dark as the peripheral
> space suggesting there is some radio emission occurring between it and
> us.
> And also, I know they billed it as a mere "picture" but would it have
> killed them to put in some form of scale or the galactic plane of M-87
> or something for reference? The shadow of the BH looks like an ellipse
> elongated in the NE to SW direction. That could be the equatorial
> plane of the black hole's rotation in which case it would be spinning
> pretty fast. But with no frame of reference it might as well be a
> photo of a UFO.
> Stuart LaForge
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