- #1
- 24,775
- 792
http://www.physicsweb.org/articles/news/9/3/2/1
title: "Galaxies break new records"
Last year Roser Pello's team at the Pyrennees Observatory thought they had found a 10 billion year old galaxy IIRC, but this was later challenged [CORRECTION: hellfire reminded me that Roser thought she had found one at z=10, it wasnt 10 billion LY but z=10 which is much more remarkable]
now according to a news item some people at European Southern say they'v found one 9 billion years old. I am not sure this makes sense or that I understand correctly. It looks to me that they are claiming redshift 1.4, which would not be record-breaking. Am I missing something?
"Christopher Mullis of the University of Michigan and co-workers at the European Southern Observatory (ESO) discovered the distant cluster by sifting through old images from the XMM-Newton satellite. They looked for large X-ray sources that had not been studied before and then took a series of follow-up images of 30 candidate galaxies at optical wavelengths with ESO's Very Large Telescope (VLT) in Chile. One of these galaxies - now named XMMU J2235.3-2557 - had a redshift of 1.4, which means that it is nine billion light years away and must have formed when the universe was less than a third of its present age. Moreover, the spherical shape of the cluster implies that it has a well-organised and mature structure (Astrophysical Journal to be published)."
Here is the technical article mentioned in the article
http://arxiv.org/abs/astro-ph/0503004
here is a webpage with more info and some pictures
http://www.astro.lsa.umich.edu/~cmullis/research/xmmuj2235/
title: "Galaxies break new records"
Last year Roser Pello's team at the Pyrennees Observatory thought they had found a 10 billion year old galaxy IIRC, but this was later challenged [CORRECTION: hellfire reminded me that Roser thought she had found one at z=10, it wasnt 10 billion LY but z=10 which is much more remarkable]
now according to a news item some people at European Southern say they'v found one 9 billion years old. I am not sure this makes sense or that I understand correctly. It looks to me that they are claiming redshift 1.4, which would not be record-breaking. Am I missing something?
"Christopher Mullis of the University of Michigan and co-workers at the European Southern Observatory (ESO) discovered the distant cluster by sifting through old images from the XMM-Newton satellite. They looked for large X-ray sources that had not been studied before and then took a series of follow-up images of 30 candidate galaxies at optical wavelengths with ESO's Very Large Telescope (VLT) in Chile. One of these galaxies - now named XMMU J2235.3-2557 - had a redshift of 1.4, which means that it is nine billion light years away and must have formed when the universe was less than a third of its present age. Moreover, the spherical shape of the cluster implies that it has a well-organised and mature structure (Astrophysical Journal to be published)."
Here is the technical article mentioned in the article
http://arxiv.org/abs/astro-ph/0503004
here is a webpage with more info and some pictures
http://www.astro.lsa.umich.edu/~cmullis/research/xmmuj2235/
Last edited by a moderator: