This diagram shows a 4x upscaled crop of my
Fornax Ultra Deep Field image with a selection of distant galaxies detected within the boundaries of the famous
Hubble Ultra Deep Field (HUDF)
Cross-checking against the available Hubble Ultra Deep Field catalogues using
VizieR, approximately 190 galaxies were identified within the HUDF catalogued area. These galaxies range in magnitude from ~20 to 25, with the most distant ones being almost 12 billion light years away!
I have selected some of the detected galaxies and shown them with a detail crop from the
Hubble Ultra Deep Field, each labelled with HUDF catalog number, redshift and distance.
The crop boundaries are overlaid on my image, including official magnitudes of detected galaxies, and to the right is the
Hubble Legacy Field and
Hubble Ultra Deep Field at the same image scale.
Assuming the HUDF to be representative of the entire image, and indeed the entire sky, this can be extrapolated to over 23,000 galaxies in my
Fornax Ultra Deep Field alone, and over 2.5 billion galaxies visible in the entire sky at this depth!
Resolution ............... 0.765 arcsec/px
Rotation ................. 178.892 deg
Reference system ......... ICRS
Geodetic coordinates ..... 174 45 00 E 36 51 00 N 240 m
Focal distance ........... 1456.58 mm
Pixel size ............... 5.40 um
Image center ............. RA: 3 32 39.046 Dec: -27 47 28.96Image Acquisition:Date: Nov 2021 - Feb 2022
Exposure: LRGB: 2850:250:225:225 mins, total 59 hours 10 mins @ -25C
Telescope: Homebuilt 12.5" f/4 Serrurier Truss Newtonian
Camera: QSI 683wsg with Lodestar guider
Filters: Astrodon LRGB E-Series Gen 2
Taken from my observatory in Auckland, New Zealand
Comments