Cosmos Redshift 7
{{Short description|Galaxy in the constellation Sextans}}
{{use dmy dates|date=June 2015}}
{{use British English|date=October 2018}}
{{Infobox galaxy
| name = Cosmos Redshift 7
| image = File:Eso1524aArtist’s impression of CR7 the brightest galaxy in the early Universe.jpg
| caption = Artist's impression of CR7
| pronounce =
| constellation name = Sextans
| epoch = Reionization
| h_radial_v =
| gal_v =
| dist_ly = 12.9 billion light-years
| group_cluster =
| type = Lyman-alpha emitter
| mass =
| mass_light_ratio =
| size =
| stars =
| appmag_v =
| appmag_b =
| absmag_v =
| size_v =
| notes = Galaxy Cosmos Redshift 7 is reported to be three times brighter than the brightest distant galaxy known up to the time of its discovery and to contain some of the earliest first stars that produced the chemical elements needed for the later formation of planets and life as it is known.
| names = COSMOS Redshift 7; Galaxy Cosmos Redshift 7; Galaxy CR7; CR7, SMD2015 CR7
| references =
}}
Cosmos Redshift 7 (also known as COSMOS Redshift 7, Galaxy Cosmos Redshift 7, Galaxy CR7 or CR7) is a high-redshift Lyman-alpha emitter galaxy. At a redshift z = 6.6, the galaxy is observed as it was about 800 million years after the Big Bang, during the epoch of reionisation. With a light travel time of 12.9 billion years, it is one of the oldest, most distant galaxies known. The name was also inspired by the Portuguese footballer Cristiano Ronaldo.
CR7 shows some of the expected signatures of Population III stars i.e. the first generation of stars produced during early galaxy formation. These signatures were detected in a bright pocket of blue stars; the rest of the galaxy contains redder Population II stars. However, recent studies show no evidence for population III stars in CR7.
Description
Galaxy Cosmos Redshift 7 contains old Population II (metal-poor) and possibly Population III (stars with extremely poor metallicity), according to astronomers, and is three times brighter than the brightest distant galaxies (redshift, z > 6) detected up to the time of its discovery.
Discovery
Astronomers led by David Sobral, a Reader in Astrophysics at the University of Lancaster, used the Very Large Telescope (VLT) at the European Southern Observatory—with help from the W. M. Keck Observatory, Subaru Telescope and the NASA/ESA Hubble Space Telescope—made the discovery. The research team included members of the University of California, Riverside, University of Geneva, University of Leiden and University of Lisbon. The name of the galaxy (Cosmos Redshift 7 Galaxy) was inspired by football player Cristiano Ronaldo, also popularly known as CR7.
See also
References
{{reflist|refs=
{{cite journal |last1=Sobral |first1=David |last2=Matthee |first2=Jorryt |last3=Darvish |first3=Behnam |last4=Schaerer |first4=Daniel |last5=Mobasher |first5=Bahram |last6=Röttgering |first6=Huub J. A. |last7=Santos |first7=Sérgio |last8=Hemmati |first8=Shoubaneh |title=Evidence For POPIII-Like Stellar Populations In The Most Luminous LYMAN-α Emitters At The Epoch Of Re-Ionisation: Spectroscopic Confirmation |date=4 June 2015 |journal=The Astrophysical Journal |doi=10.1088/0004-637x/808/2/139 |bibcode=2015ApJ...808..139S |volume=808 |issue=2 |pages=139|arxiv = 1504.01734|s2cid=18471887 }}
{{cite news |last=Overbye |first=Dennis |author-link=Dennis Overbye |title=Astronomers Report Finding Earliest Stars That Enriched Cosmos |url=https://www.nytimes.com/2015/06/18/science/space/astronomers-report-finding-earliest-stars-that-enriched-cosmos.html |date=17 June 2015 |work=The New York Times |accessdate=17 June 2015}}
{{cite web |author=Staff |title=Brightest galaxy and first-generation stars |url=https://earthsky.org/space/brightest-galaxy-and-first-generation-stars |date=17 June 2015 |work=Earth & Sky |accessdate=17 June 2015}}
{{cite web |last=Pittalwala |first=Iqbal |title=Astronomers Find Best Observational Evidence of First Generation Stars in the Universe |url=http://ucrtoday.ucr.edu/29947 |date=17 June 2015 |work=University of California, Riverside |accessdate=17 June 2015}}
{{cite press release|url=https://www.eso.org/public/news/eso1524/|title=Best Observational Evidence of First Generation Stars in the Universe|publisher=European Southern Observatory|date=17 June 2015}}
{{cite journal |last1=Matthee |first1=Jorryt |last2=Sobral |first2=David |journal=MNRAS |date=21 July 2015 |volume=451 |issue=1 |pages=4919–4936 |doi=10.1093/mnras/stv947 |title=Identification of the brightest Lyalpha emitters at z=6.6: implications for the evolution of the luminosity function in the re-ionisation era |doi-access=free |arxiv=1502.07355|bibcode = 2015MNRAS.451..400M |display-authors=etal}}
{{Cite news |author=Staff |title=Cristiano Ronaldo: CR7 name given to discovered galaxy |url=https://www.bbc.com/sport/0/football/33185760 |date=18 June 2015 |accessdate=18 June 2015 |work=BBC}}
{{cite web |author=Staff |title=Cristiano Ronaldo: CR7 gets his own galaxy |url=https://edition.cnn.com/2015/06/18/football/cristiano-ronaldo-galaxy-football/ |date=18 June 2015 |access-date=18 June 2015 |work=CNN}}
{{cite journal |author1=R. A. A. Bowler |author2=R. J. McLure |author3=J. S. Dunlop |author4=D. J. McLeod |author5=E. R. Stanway |author6=J. J. Eldridge |author7=M. J. Jarvis |title=No evidence for Population III stars or a direct collapse black hole in the z = 6.6 Lyman α emitter 'CR7' |volume=469 |issue=1 |pages=448–458 |date=3 April 2017 |journal=Monthly Notices of the Royal Astronomical Society |doi=10.1093/mnras/stx839 |doi-access=free |arxiv=1609.00727 |url=https://academic.oup.com/mnras/article/469/1/448/3103051}}
}}
External links
- {{YouTube|yLO8QJQ-emQ|COSMOS Redshift 7 (CR7) - the brightest galaxy in the early Universe}}
- [http://deepspacemap.com/#?l=1.8488,29.076,13 Cosmos Redshift 7 galaxy] on Deep Space Map
{{Galaxy}}
{{Stars of Sextans}}
{{European Southern Observatory}}
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