Buried Rings

I started a new collection: #BuriedRing s! Check it out: http://talk.spacewarps.org/#/collections/CSWL000001

Here's the spiel:

Some of the toughest lenses to spot! Key features are: a biggish
bright yellow galaxy, with a circular ring of different-coloured light
around it that is blended with the yellow galaxy starlight. These
rings will be rare, but they are real gems: the fact that the lensed
feature is a ring means that the source is being highly magnified, and
that there is a lot of information about the mass distribution of
the lens galaxy.

We have to be a bit careful not to rinse this hashtag with loads of spiral galaxies, but it could be a really nice sample. Raphael Gavazzi ran his RingFinder software in CFHTLS during the SL2S project, and we found a lot of lenses this way, digging around underneath bright yellow galaxies. However, we had to make a first cut by lens colour and brightness, so I'm thinking there could be a few really bright rings that RingFinder missed because they messed up the catalog object colors - and there could be red rings that wouldn't have made the cut either.

Let's start by browsing everyone's "My Simulations" collections, and collecting the simulated BuriedRing s, and go on to the "My Candidates" collections from there!

Posted May 10, 2013 10:15 AM

by Mjtbarrett

http://talk.spacewarps.org/#/subjects/ASW0001abb may be worth a quick look? At the top edge, right of centre there's an object with a large halo. Inside the halo is an incomplete bright blue ring that may indicate a highly magnified lensing event? It isn't as well defined as your examples but looks as if there are some similarities. If not, and you'd prefer me to remove this comment I'll be happy to do so.

Posted May 14, 2013 10:34 AM

by jiipee

Possible buried lens in lower part of the upper left quarter? Bright white/yellow object just above the vertical axis, about 1/10 from the edge. It has some hidden structures revealed in bluer mode

Posted May 14, 2013 3:29 PM

by drphilmarshall scientist, admin

Cool - great you got a better look at it, @jiipee.
@mtjbarrett, I tagged yours a #buriedring as well, thinking it would be good to come back and take a better look at some point. Im hoping we can get a Dashboard going in Talk somehow. One day 😃

Posted May 16, 2013 7:57 PM

by Mjtbarrett

http://talk.spacewarps.org/#/subjects/ASW00005ap has an arc in halo of yello object. ?#buriedring

Posted May 19, 2013 6:46 AM

by JasonJason

Is this a #Buriedring ?

ASW0000isv

enter image description here

Posted May 19, 2013 9:15 AM

by JasonJason

Are these #Buriedring 's ?
Left and top in image ASW0000jh7 I save a bluer if it would help in determining.

Posted May 19, 2013 9:50 AM

by anupreeta scientist, admin

Hi All,
Great to see this collection. Most of the #Buriedring sim lenses will have a yellow galaxy and a bluish ring around it. These images will tend to have a label "Training image". Although there could be some exceptions to these but please try to look for these features when you see one next. If the object is greenish white or reddish white and very bright, its most likely a star (as you see in the images above). Hope this helps!

Posted May 20, 2013 12:27 AM

by drphilmarshall scientist, admin in response to JasonJason's comment.

The faint spikes coming out of the object at 12, 3, 6 and 9 o clock mark it out as a star. Big source of false positives, they are!

Posted May 26, 2013 8:05 PM

by HeadAroundU

http://talk.spacewarps.org/#/subjects/ASW0000jc1

Posted May 31, 2013 1:23 PM

by drphilmarshall scientist, admin

Good stuff @Mitch! I trust you are tagging each of these images as a #buriedring in the object comments, right? We should try and keep this board for discussion of the properties of buried rings in general rather than discussion of specific possible buried ring candidates... Some nice spots though, well caught!

Posted June 4, 2013 3:29 PM

by mitch

Oh, sorry about that - yes they are being tagged as possibles

Posted June 4, 2013 3:53 PM

by drphilmarshall scientist, admin in response to mitch's comment.

Super! 😃

Posted June 4, 2013 4:03 PM

by mitch in response to drphilmarshall's comment.

I've put all of the possibles in a buriedring collection
http://talk.spacewarps.org/#/collections/CSWS000i10

Posted June 7, 2013 12:13 AM

by mitch

I have had three objects lately with really strange coloured rings

http://talk.spacewarps.org/#/subjects/ASW000363x

http://talk.spacewarps.org/#/subjects/ASW00029sv

http://talk.spacewarps.org/#/subjects/ASW0003cci

One of the galaxies also is a spiral and I wouldn't think it would have the mass to generate a lens - are they sims that weren't tagged?

Posted June 7, 2013 12:20 AM

by drphilmarshall scientist, admin in response to mitch's comment.

Actually, the ring in the centre of the spiral could well be the right size for such a low mass galaxy. Still, I think its more likely an artifact from a bright point source at the galaxy's centre - an AGN, perhaps. If the blue channel resolution is lower than that of the green/red channels, you can get a ring-shaped artifact. Youve probably seen this in the buriedring collection, already with some yellow stars.

Posted June 19, 2013 1:06 AM

by c_cld

@drphilmarshall
Hi Phil, I've found the same artifact in ASW0003bhp. I was fooled by a small pink ring at a small distance from the core (like a 1st airy ring) seen in the "bluer" quick dashboard. I wrongly tagged buriedring instead of no_lens.
Looking at the "buriedring" collection, the same artifact could be present in large elliptical galaxies such as ASW00009xn ASW0000myb ASW0002yfu ASW0003gko ASW000485e ASW0004iak .
Could you check with Amit that this happen by the parameters (stretch, q) used in "bluer". Thanks for confirming my point and for giving some advice to reject such tag on images.
cheers

Posted June 21, 2013 7:31 AM

by Budgieye moderator