72 Previously Unseen Galaxies Discovered in Hubble Ultra Deep Field

Image: View of the Ultra Deep Field survey via ESO/MUSE HUDF Collaboration

 Astronomers using the MUSE instrument on the European Southern Observatory's Very Large Telescope in Chile have discovered 72 potential galaxies hiding in plain sight. The discovery of these galaxies, which were found in a vast patch of sky previously observed by the Hubble Space Telescope, has resulted in the publishing of 10 scientific papers.
 Astronomers discovered the group of galaxies while measuring the distances and properties of 1,600 galaxies captured in Hubble during its Ultra Deep Field survey. This swath of space is located in a tiny region of the sky in the southern constellation Fornax (the Furnace).
 "MUSE can do something that Hubble can't — it splits up the light from every point in the image into its component colours to create a spectrum. This allows us to measure the distance, colours and other properties of all the galaxies we can see — including some that are invisible to Hubble itself," said survey team leader Roland Bacon, astrophysicist at the Centre for Astrophysics Research of Lyon.
"We learn things about these galaxies that [it] is only possible [to learn] with spectroscopy, such as chemical content and internal motions — not galaxy by galaxy, but all at once for all the galaxies," added Jarle Brinchmann, an astronomer at Leiden University in the Netherlands

Read more about this fascinating story at: https://www.space.com/38925-never-before-seen-galaxies-hubble-ultra-deep-field.html
Or read the 10 scientific studies based on this amazing discovery here:

1. Bacon et al. “The MUSE Hubble Ultra Deep Field Survey: I. Survey description, data reduction and source detection”
2. Inami et al. “The MUSE Hubble Ultra Deep Field Survey: II. Spectroscopic Redshift and Line Flux Catalog, and Comparisons to Color Selections of Galaxies at 3 < z < 7”
3. Brinchmann et al. “The MUSE Hubble Ultra Deep Field Survey: III. Testing photometric redshifts to 30th magnitude”
4. V. Maseda et al. “The MUSE Hubble Ultra Deep Field Survey: IV. An Overview of C III] Emitters”
5. Guérou et al. “The MUSE Hubble Ultra Deep Field Survey: V. Spatially resolved stellar kinematics of galaxies at redshift 0.2 ≲ z ≲ 0.8”
6. B. Drake et al. “The MUSE Hubble Ultra Deep Field Survey: VI. The Faint-End of the Lyα Luminosity Function at 2.91 < z < 6.64 and Implications for Reionisation”
7. Finley et al. “The MUSE Hubble Ultra Deep Field Survey:VII. Fe II* Emission in Star-Forming Galaxies”
8. Leclercq et al. “The MUSE Hubble Ultra Deep Field Survey: VIII. Extended Lyman α haloes”
9. Ventou et al. “The MUSE Hubble Ultra Deep Field Survey: IX. evolution of galaxy merger fraction up to z ≈ 6”
10. Hashimoto et al. “The MUSE Hubble Ultra Deep Field Survey: X. Lyα Equivalent Widths at 2.9 < z < 6.6”