Define Z mag

• by onetimegolfer

  This object has a Z mag = 15.7634 does this mean this that this object is 157+ billion light years away?

  Posted May 23, 2015 11:25 AM

• by anoxie

  I think you're mistaking the zmag for z refering to the redshift of an onject.

  Here, as all the stars you can see in DD, it is relatively nearby with no significant redshift.

  Posted May 23, 2015 4:24 PM

• by onetimegolfer

  Refer to http://skyserver.sdss3.org/dr9/en/tools/quicklook/quickobj.asp?id=1237673705567094838 ;hit explore;notice column z; explain or clarify. Im still confused on this.

  Posted May 23, 2015 6:53 PM

• by anoxie

  hi,

  the Z band is one of several filters (u, g, r, i, z) used on the SDSS camera.
  zmag is the magnitude of the star in the z band (purple), centered on 8932Å:

  

  this zmag shoud not be mistaken for z, refering to the redshift for distant objects.

  Posted May 23, 2015 8:12 PM

• by onetimegolfer

  Great explanation ; thank-you for the info. now I still have to recognize the z redshift: Thank-you Anoxie

  Posted May 23, 2015 9:12 PM