Globular Cluster NGC 6553 & Gravitational Lensing

[jsmoraes]

Constelation of Sagitarius, distant from 19,000 light years. ESO discovered a microlensing by a black hole with a mass twice of the Sun. Maybe it lies inside the cluster. It brings out an amplified image of a red giant star of the background object.

 I didn't understand who the ESO's arrow is pointing exactly: the stars near its tip or the red star near and on its direction.

http://www.eso.org/p...ages/potw1540a/

http://www.eso.org/p...0/potw1540a.pdf

GSO 305 mm - Canon T3 - 24 x 2 min (48 min) - OAG - Skyglow filter - Coma corrector

http://www.astrobin.com/218916/

[jsmoraes]

Ops! It seems that the links are wrong ! I can't edit the message above, so here is the correct link:

Image: http://www.eso.org/public/images/potw1540a/

PDF file: http://www.eso.org/public/archives/releases/sciencepapers/potw1540/potw1540a.pdf

[jsmoraes]

Reading the PDF file from ESO I have solution for my doubt about the who is the target of the arrow. I did correction of my images above.

And the image of this microlens by ESO:

[jsmoraes]

24 x 2 min - ISO 800 + 14 x 1 min - ISO 1600 ( 1h 02 min)