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| == Discovery == | == Discovery == | ||
| Discovery of the galaxy, hiding behind a relatively fast-moving foreground star, became apparent when the star moved aside, clearing the view to the obscured galaxy. Detailed studies of the galaxy were reported in November 2022, and were based on work using the ].<ref name="NASA-20221206" /> In the words of ], astronomer at ] in Australia, original discoverer of the galaxy 20 years ago,<ref name="UT-20221207">{{cite news |last=Gough |first=Evan |title=A Star was Blocking a Galaxy, but Now it’s Moved Enough That Astronomers can Finally Examine What it Was Hiding |url=https://www.universetoday.com/159045/a-star-was-blocking-a-galaxy-but-now-its-moved-enough-that-astronomers-can-finally-examine-what-it-was-hiding/ |date=7 December 2022 |work=] |accessdate=18 December 2022 }}</ref> and coauthor of the recent study of the galaxy, "At first we did not realize how special this little galaxy is ... Now with combined data from the Hubble Space Telescope, the ] (SALT), and others, we know that the Peekaboo Galaxy is one of the most metal-poor galaxies ever detected."<ref name="SA-20221216" /> In addition, astronomer Gagandeep Anand of the ] and coauthor of the recently published studies, "Uncovering the Peekaboo Galaxy is like discovering a direct window into the past, allowing us to study its extreme environment and stars at a level of detail that is inaccessible in the distant, early universe ... Due to Peekaboo’s proximity to us, we can conduct detailed observations, opening up possibilities of seeing an environment resembling the ] in unprecedented detail.” <ref name="SA-20221216" /> | Discovery of the galaxy, hiding behind a relatively fast-moving foreground star, became apparent when the star moved aside, clearing the view to the obscured galaxy. Detailed studies of the galaxy were reported in November 2022, and were based on work using the ].<ref name="NASA-20221206" /> In the words of ], astronomer at ] in Australia, original discoverer of the galaxy 20 years ago,<ref name="UT-20221207">{{cite news |last=Gough |first=Evan |title=A Star was Blocking a Galaxy, but Now it’s Moved Enough That Astronomers can Finally Examine What it Was Hiding |url=https://www.universetoday.com/159045/a-star-was-blocking-a-galaxy-but-now-its-moved-enough-that-astronomers-can-finally-examine-what-it-was-hiding/ |date=7 December 2022 |work=] |accessdate=18 December 2022 }}</ref> and coauthor of the recent study of the galaxy, "At first we did not realize how special this little galaxy is ... Now with combined data from the Hubble Space Telescope, the ] (SALT), and others, we know that the Peekaboo Galaxy is one of the most metal-poor galaxies ever detected."<ref name="SA-20221216" /> In addition, astronomer Gagandeep Anand of the ] and coauthor of the recently published studies, "Uncovering the Peekaboo Galaxy is like discovering a direct window into the past, allowing us to study its extreme environment and stars at a level of detail that is inaccessible in the distant, early universe ... Due to Peekaboo’s proximity to us, we can conduct detailed observations, opening up possibilities of seeing an environment resembling the ] in unprecedented detail.” <ref name="SA-20221216" /> The astronomers pose a concern that may have to await further studies of the Peekaboo Galaxy for clarification: “The situation with Peekaboo is decidedly ambiguous ... How can it have such low metallicity when 13 billion years have passed in the Local Universe?"<ref name="UT-20221207"/> | ||
| == See also == | == See also == | ||
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| Pedekaboo Galaxy | |
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 | |
| Observation data (J2000 epoch) |
The Peekaboo Galaxy (officially known as HIPASS J1131-31) is an irregular compact blue (suggesting hot young stars) dwarf galaxy, about 1,200 light-years across, that is nearby, at a distance of about 20 million light-years (6.8 ± 0.7 Mpc) away, and is considered one of the most metal-poor ("extremely metal-poor" (XMP)), least chemically enriched, and seemingly primordial galaxies known.
Discovery
Discovery of the galaxy, hiding behind a relatively fast-moving foreground star, became apparent when the star moved aside, clearing the view to the obscured galaxy. Detailed studies of the galaxy were reported in November 2022, and were based on work using the Hubble Space Telescope. In the words of Bärbel Koribalski, astronomer at CSIRO in Australia, original discoverer of the galaxy 20 years ago, and coauthor of the recent study of the galaxy, "At first we did not realize how special this little galaxy is ... Now with combined data from the Hubble Space Telescope, the Southern African Large Telescope (SALT), and others, we know that the Peekaboo Galaxy is one of the most metal-poor galaxies ever detected." In addition, astronomer Gagandeep Anand of the Space Telescope Science Institute and coauthor of the recently published studies, "Uncovering the Peekaboo Galaxy is like discovering a direct window into the past, allowing us to study its extreme environment and stars at a level of detail that is inaccessible in the distant, early universe ... Due to Peekaboo’s proximity to us, we can conduct detailed observations, opening up possibilities of seeing an environment resembling the early universe in unprecedented detail.” The astronomers pose a concern that may have to await further studies of the Peekaboo Galaxy for clarification: “The situation with Peekaboo is decidedly ambiguous ... How can it have such low metallicity when 13 billion years have passed in the Local Universe?"
See also
- Galaxy formation and evolution
- I Zwicky 18
- List of galaxies
- Metallicity distribution function
- Metallicity#Galaxies
- Stellar classification
- Stellar evolution
- Stellar population
Reference s
- Karachentsev, J.D.; et al. (12 November 2022). "Peekaboo: the extremely metal poor dwarf galaxy HIPASS J1131-31". Monthly Notices of the Royal Astronomical Society. 518 (4): 5893–5903. doi:10.1093/mnras/stac3284. Retrieved 18 December 2022.
{{cite journal}}: CS1 maint: unflagged free DOI (link) - ^ Villard, Ray (6 December 2022). "Peekaboo! A Tiny, Hidden Galaxy Provides A Peek Into The Past - Tucked Away In A Local Pocket Of Dark Matter, A Late-Blooming Dwarf Galaxy Looks Like iI Belongs In The Early Universe". NASA. Retrieved 18 December 2022.
- ^ Parks, Jake (16 December 2022). "Hubble spots a nearby galaxy that looks like it belongs in the early universe - The extremely metal-poor galaxy, nicknamed Peekaboo, relatively recently emerged from behind a fast-moving star". Scientific American. Retrieved 18 December 2022.
- ^ Gough, Evan (7 December 2022). "A Star was Blocking a Galaxy, but Now it's Moved Enough That Astronomers can Finally Examine What it Was Hiding". Universe Today. Retrieved 18 December 2022.
External links
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| Location | Milky Way → Milky Way subgroup → Local Group → Local Sheet → Virgo Supercluster → Laniakea Supercluster → Local Hole → Observable universe → Universe Each arrow (→) may be read as "within" or "part of". |  | |||||
| Structure |
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| Satellite galaxies | |||||||
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