NOIRLab: Ultra-Faint Fossil Galaxy Discovered on Outskirts of Andromeda

[bystander]

Gemini North Spies Ultra-Faint Fossil Galaxy
Discovered on Outskirts of Andromeda
Gemini North | NOIRLab | NSF | 2022 Jun 30

Click to view full size image 1 or image 2

Ultra-Faint Dwarf Galaxy Pegasus V ~ Gemini Observatory/NOIRLab/NSF/AURA
Processing: T.A. Rector (Univ of Alaska Anchorage/NSF’s NOIRLab),
M. Zamani (NSF’s NOIRLab) & D. de Martin (NSF’s NOIRLab)

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NSF’s NOIRLab facilities reveal a relict of the earliest galaxies

An unusual ultra-faint dwarf galaxy has been discovered on the outer fringes of the Andromeda Galaxy thanks to the sharp eyes of an amateur astronomer examining archival data processed by NSF’s NOIRLab’s Community Science and Data Center. Follow-up by professional astronomers using the International Gemini Observatory, a Program of NSF’s NOIRLab, revealed that the dwarf galaxy — Pegasus V — contains very few heavier elements and is likely to be a fossil of the first galaxies. ...

The observations with Gemini revealed that the galaxy appears to be extremely deficient in heavier elements compared to similar dwarf galaxies, meaning that it is very old and likely to be a fossil of the first galaxies in the Universe. ...

Pegasus V -- A Newly Discovered Ultra-Faint Dwarf Galaxy
on the Outskirts of Andromeda ~ Michelle L. M. Collins et al

• arXiv > astro-ph > arXiv:2204.09068 > 19 Apr 2022

[Fred the Cat]

Gemini North Spies Ultra-Faint Fossil Galaxy
Discovered on Outskirts of Andromeda
Gemini North | NOIRLab | NSF | 2022 Jun 30

Click to view full size image 1 or image 2

Ultra-Faint Dwarf Galaxy Pegasus V ~ Gemini Observatory/NOIRLab/NSF/AURA
Processing: T.A. Rector (Univ of Alaska Anchorage/NSF’s NOIRLab),
M. Zamani (NSF’s NOIRLab) & D. de Martin (NSF’s NOIRLab)

---

NSF’s NOIRLab facilities reveal a relict of the earliest galaxies

An unusual ultra-faint dwarf galaxy has been discovered on the outer fringes of the Andromeda Galaxy thanks to the sharp eyes of an amateur astronomer examining archival data processed by NSF’s NOIRLab’s Community Science and Data Center. Follow-up by professional astronomers using the International Gemini Observatory, a Program of NSF’s NOIRLab, revealed that the dwarf galaxy — Pegasus V — contains very few heavier elements and is likely to be a fossil of the first galaxies. ...

The observations with Gemini revealed that the galaxy appears to be extremely deficient in heavier elements compared to similar dwarf galaxies, meaning that it is very old and likely to be a fossil of the first galaxies in the Universe. ...

Pegasus V -- A Newly Discovered Ultra-Faint Dwarf Galaxy
on the Outskirts of Andromeda ~ Michelle L. M. Collins et al

• arXiv > astro-ph > arXiv:2204.09068 > 19 Apr 2022

Galaxy or cluster? How can something we can't define make the difference?