Examples of using Dashboard / Open in Tools

• by Budgieye moderator

  Why click on Tools / Dashboard.? To look for ultraviolet light

  blue arcs have UV light

  blue galaxies "near" to us don't have much UV light

  so we can tell if an blue arc is a lensed galaxy, or just something nearby.

  ---

  There are 5 bands of light at various wavelengths that are recorded by the ccd camera.
  u violet (nearly ultraviolet)
  b blue
  g green
  r red
  i far red (nearly Infrared)

  Only 3 of these bands are used to make images. Our computer screens can only deal with 3 colour channels, so it uses only g, r and i bands.

  green (g) light from the star, and turns it into blue

  red (r) light from the star, and turns it into green

  far red (i) light from the star, and turns it into red

  u (violet light ) and b(blue light) aren't used for the images.

  Using Tools / Dashboard, we can look for violet light. Energetic light from distant lensed galaxies has a lot of ultraviolet (UV) light and hopefully we can detect that by looking for violet light, which is also high energy.

  For information on spectral charts, see

  Zooite Guide to SDSS Spectra http://www.galaxyzooforum.org/index.php?topic=274815.0

  and

  Colours of Galaxies in SDSS : Redshift chart http://www.galaxyzooforum.org/index.php?topic=277142.0 (SDSS telescope has fuzzier images, but the colours are the same)

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  Click on the u band to find how much violet light there is. Arcs have violet and ultraviolet light, which is denoted by u.

  Click on copy to save the settings, and then copy the address.

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  Finding buried arcs

  violet (u band) ring under the pink arc

  

  http://talk.spacewarps.org/#/subjects/ASW0009ab8 posted by C_cld

  http://tools.zooniverse.org/#/dashboards/spacewarp/52743a60fe16d9399c000023

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  Finding buried quasars

  #sim slightly suspicious blue edge to nucleus in this sim

  

  http://talk.spacewarps.org/#/subjects/ASW0002vrd posted by leonmir56

  #sim buried Einstein cross visible in u band http://tools.zooniverse.org/#/dashboards/spacewarp/5276f3ca72c1091e0c000075...

  Posted November 2, 2013 10:22 PM

• by Budgieye moderator

  Dashboard / tools not useful for finding lensed quasars.

  Quasars don't have a u band? Blue quasars already have their UV light ( Lyman alpha radiation) redshifted to blue, so they don't have any UV light left to make a u band.

  Here is a sim

  

  http://talk.spacewarps.org/#/subjects/ASW0000sbg posted by surhudm

  Here is the u band (violet light) http://tools.zooniverse.org/#/dashboards/spacewarp/527519b1fe16d95efd000047 , quasars are not visible.

  Here is the g band (blue light) http://tools.zooniverse.org/#/dashboards/spacewarp/52751a0572c109248d000049, can see the quasars, but it also could be small blue galaxies or blue stars.

  Here is the r band (green light) http://tools.zooniverse.org/#/dashboards/spacewarp/52751a8d72c109248d00004c, can see the quasars, but it also could small green galaxies, or white stars.

  Posted November 2, 2013 10:28 PM

• by Budgieye moderator

  A sim but not a #dimsim, it is totally amazing in Tools / Dashboard / u band http://tools.zooniverse.org/#/dashboards/spacewarp/5274452672c1090333000046

  To save the settings on dashboard /tools , click on the copy button, then copy the address bar to your post. Anyone know how to post the dashboard image?

  

  http://talk.spacewarps.org/#/subjects/ASW0007mmh posted by HelPer2

  Posted November 2, 2013 10:29 PM

• by Budgieye moderator

  Finding detail in blobs of white light. Separate the g band (blue) from the red (i band) dust

  

  http://talk.spacewarps.org/#/subjects/ASW000085w posted by dtrucken

  #dust_lane visible in the g band in dashboard http://tools.zooniverse.org/#/dashboards/spacewarp/52743713fe16d9399c000020

  Posted November 2, 2013 10:30 PM

• by Budgieye moderator

  bright blob

  

  http://talk.spacewarps.org/#/subjects/ASW0000a2d posted by TED91

  double nucleus, seem in g band http://tools.zooniverse.org/#/dashboards/spacewarp/52743893fe16d939a900001e

  Posted November 2, 2013 10:30 PM

• by Budgieye moderator

  Illustrating that blue quasars do not have UV light.

  Training image/sim quasar points easily visible in blue light

  

  http://talk.spacewarps.org/#/subjects/ASW0008c4h posted by fermor332002

  quasar points barely visible in u band, lensing galaxy not visible in u band dashboard http://tools.zooniverse.org/#/dashboards/spacewarp/52759278fe16d9039f00015a

  Posted November 3, 2013 12:05 AM

• by Budgieye moderator

  Why click on Tools / Dashboard.? To look for ultraviolet light

  blue arcs have UV light

  blue galaxies "near" to us don't have much UV light

  so we can tell if an blue arc is a lensed galaxy, or just something nearby.

  ---

  There are 5 bands of light at various wavelengths that are recorded by the ccd camera.
  u violet (nearly ultraviolet)
  b blue
  g green
  r red
  i far red (nearly Infrared)

  Only 3 of these bands are used to make images. Our computer screens can only deal with 3 colour channels, so it uses only g, r and i bands.

  green (g) light from the star, and turns it into blue

  red (r) light from the star, and turns it into green

  far red (i) light from the star, and turns it into red

  u (violet light ) and b(blue light) aren't used for the images.

  Using Tools / Dashboard, we can look for violet light. Energetic light from distant lensed galaxies has a lot of ultraviolet (UV) light and hopefully we can detect that by looking for violet light, which is also high energy.

  Posted November 4, 2013 1:51 AM

• by Budgieye moderator

  X marks the spot in violet light, u

  Exploring aprajita's blog

  http://blog.spacewarps.org/2013/08/15/x-marks-the-spot-new-gravitational-lens-candidates-from-space-warps/

  ---

  

  http://talk.spacewarps.org/#/subjects/ASW0004dv8 posted by rotex

  can see complete ring in u, but it is faint

  http://tools.zooniverse.org/#/dashboards/spacewarp/5279ea6072c1095eb1000027

  ---

  

  http://talk.spacewarps.org/#/subjects/ASW0003wsu posted by bernmeister

  violet light http://tools.zooniverse.org/#/dashboards/spacewarp/5279e8ce72c10947e2000334

  ---

  

  http://talk.spacewarps.org/#/subjects/ASW00047ae posted by FBloggs

  violet is quite bright http://tools.zooniverse.org/#/dashboards/spacewarp/5279eac5fe16d92fd1000009

  ---

  

  http://talk.spacewarps.org/#/subjects/ASW0005mp6 posted by ElisabethB

  nothing much in u http://tools.zooniverse.org/#/dashboards/spacewarp/5279ec0572c1095eb100002b

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  http://talk.spacewarps.org/#/subjects/ASW0004q9e posted by tashipoo

  http://tools.zooniverse.org/#/dashboards/spacewarp/5279ecd2fe16d9139600004d

  ---

  

  http://talk.spacewarps.org/#/subjects/ASW0001yqb posted by mitch

  looks almost like a quasar double, though not bright

  http://tools.zooniverse.org/#/dashboards/spacewarp/5279edc972c109491d0000a1

  Posted November 6, 2013 7:00 AM

• by HelPer2

  So, just so I understand, for a possible arc it's worth using Tools and looking in u band, where a true arc should be visible? And for possible quasar, it perhaps wouldn't be?

  Also, is it possible that if seeing a possible arc, but with no visible lensing object, looking in Tools might reveal there was something massive enough there? (BTW if so, I might have to go back through all my images to check them!)
  Thanks

  Posted November 10, 2013 9:01 PM

• by Budgieye moderator

  It is possible to have an invisible lensing galaxy, just not likely. It would be an elliptical galaxy, with no star formation, hence no UV light. The galaxy would have to be very far away, z=1.0 for all it its blue light to be redshifted into the infrared, which our telescope doesn't see.

  I suppose it is always possible to have dark matter without an accompanying galaxy. I don't think one has been found yet, but we in SpaceWarps are pushing back the frontiers of science.

  There was a quad quasar published z=3 I think, with an invisible galaxy, I keep intending to re-post it when I find the reference again.

  I don't think that it would be necessary to go back and look up old images. The arc would still be there in the other colours, but there is more contrast in violet, since there isn't much violet in galaxies.

  Most distant lensed galaxies are star-forming. Distant galaxies are younger, and so produce lots of blue, violet and ultraviolet light. But since no two galaxies are alike, I suppose there could still be smaller and dimmer ones which would make dimmer arcs.

  Any closer elliptical galaxies z=0.6 that get lensed ,will be red galaxies, and they would be lensed into a red arc, with no other colours.

  Posted November 12, 2013 2:36 PM