Lil help

• by GoldenRule

  This galaxy can be seen in uv but not inferred or allwise. What does that mean? If I didn't ask that correctly I apologise.

  Posted June 8, 2017 3:19 AM

• by Budgieye moderator

  Infrared cameras collect light poorly, so dim galaxies fade away. Fancy detectors are used to collect the IR light. I think the larger wavelength of light makes the images blurry.
  I can see it in ALLWISE

  http://irsa.ipac.caltech.edu/applications/finderchart/#&id=Hydra_finderchart_finder_chart&projectId=finderchart&UserTargetWorldPt=327.2659;-7.2710;EQ_J2000&subsize=0.195556&sources=DSS,SDSS,2MASS,IRIS,WISE&DoSearch=true

  Here it is in UNWISE NEO

  

  http://legacysurvey.org/viewer/jpeg-cutout/?ra=327.2671&dec=-7.2698&zoom=12&layer=unwise-neo1

  http://legacysurvey.org/viewer/jpeg-cutout/?ra=327.2671&dec=-7.2698&zoom=12&layer=unwise-neo1

  http://legacysurvey.org/viewer?ra=327.2659&dec=-7.2710&zoom=14&layer=unwise-neo1

  Posted June 8, 2017 1:00 PM

• by Budgieye moderator

  Terms are Infrared and ALLWISE

  http://wise2.ipac.caltech.edu/docs/release/allwise/expsup/sec1_1.html

  Posted June 8, 2017 1:17 PM

• by Budgieye moderator in response to zoob1172's comment.

  zoob1172, can you please stop editing your posts after people have commented. They don't make sense when people try to read through a discussion. Or add EDIT: in front of the edited part.

  Posted June 8, 2017 6:59 PM

• by Budgieye moderator

  I had thought that was a reasonable request.

  Posted June 8, 2017 7:19 PM

• by GoldenRule

  Thank you. It just had me curious bc many galaxies don't show in the UV n I couldn't find a definite answer.

  Posted June 9, 2017 3:24 AM

• by Budgieye moderator

  zoob1172, since you have deleted your comments, this discussion no longer makes sense.

  Posted June 9, 2017 6:01 AM

• by Budgieye moderator

  zoob1172, I have sent you a personal message, which you can access by clicking on the envelope picture at the top right of this page.

  Posted June 9, 2017 6:59 AM

• by Budgieye moderator

  For a galaxy to be visible in UV, it has to be very hot, about 50,000 to a million degrees. Most stars only get to 5000 degrees at their surface.

  have either

  many hot blue stars, supervnovae, white dwarfs

  or

  seeing into the center of a AGN, so the view is not shielded by dust.

  or

  colliding galaxies.

  see

  PAGE 3 Spectra guide for SDSS images in Galaxy Zoo Talk https://talk.galaxyzoo.org/#/boards/BGZ0000001/discussions/DGZ0000ulp?page=3&comment_id=53fef2ee3d5a77490c0001b6

  Posted June 9, 2017 8:10 AM

• by GoldenRule

  Thank you for the link. I'm going to read it shortly. I've noticed for awhile that some galaxies don't show in uv n some do. Always wondered why. Thanks again!

  Posted June 10, 2017 11:30 PM

• by GoldenRule

  I'm a little confused still I thought the center of a galaxy with an AGN was the hottest part. Yet most galaxies I can see in the UV the AGN isn't dominant or even visible but the rest/shape of the galaxy is.

  Posted June 11, 2017 12:08 AM

• by Budgieye moderator

  Many galaxies don't have an active nucleus, for example our own Milky Way Galaxy. Others have an AGN but the bright bit is totally obscured by dust.

  Posted June 11, 2017 3:44 PM