size and brightness of Einstein rings

[jnb]

Is there anywhere a catalogue of Einstein rings listing Their size and magnitude? What are the largest and brightest? I was wondering what Is the smallest scope that could observe Them.

[Stu]

Hi jnb,

@Martin Meredith or @nytecam might be your best bet for these. Both do EAA (Video astronomy) and image very faint ibjects. Something in the back of my mind tells me that one of them has posted images of Einstein rings before. They are tough targets though!

Stu

[Martin Meredith]

Do you mean gravitational lenses? There is is catalogue of gravitationally-lensed quasars obtainable at CDS (look for VII/258/table2) but it doesn't list magnitudes or sizes (it lists separations between the lensed components though). Most of these things are exceedingly faint but Einstein's Cross has been observed visually with a very large scope.

Martin

[Martin Meredith]

Stu, talk of the devil... ;-)

I've not managed one yet but Nytecam has. A fairly long focal length is needed to capture these tiny blighters.

Martin

Edited July 29, 2016 by Martin Meredith

[Stu]

10 minutes ago, Martin Meredith said:

Stu, talk of the devil... ;-)

I've not managed one yet but Nytecam has. A fairly long focal length is needed to capture these tiny blighters.

Martin

Thanks Martin, I knew one of you two would have managed it