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Natural Science Forum / Physics / General Physics / September 2007Redshift 10 Galaxies?
Redshift 10 Galaxies? http://www.astro.ucla.edu/~wright/cosmolog.htm#News 12 Jul 07 - Stark et al. claim to have detected Lyman alpha emission from 6 candidate objects with redshifts between 8.5 and 10.2. These are very faint sources which have been magnified by the gravitational lensing of a foreground cluster of galaxies, and even then barely detected with very long exposures on the Keck telescopes. The negative image at right shows a near infrared image taken with the Hubble Space Telescope, and it is clear that whatever there is in the center of the circle is very faint. But when the light coming from the center of the circle is spread out into a spectrum using the NIRSPEC instrument built at UCLA there is an easily visible clump in the spectral image, shown at left. This is also a negative image, so the dark spot in the center of the circle is an emission line. This spectral line is at a wavelength of 1.355 microns, which is 11.1 times longer than the rest wavelength of Lyman alpha, so if it really is Lyman alpha, the redshift of this source is 10.1. Using my cosmology calculator, one finds that the age of the Universe was 475 million years when this galaxy emitted the light that we see. That light took 13.190 billion years to reach us, and the galaxy is now 31.578 billion light years away from us due to the expansion of the Universe. One note of caution: a previous claimed redshift 10 galaxy based on the same kind of evidence was not confirmed. See: http://arxiv.org/abs/astro-ph/0701279 [...] I have been wondering when folks would start using gravitational lensing for actual magnification and such. > [...] > > I have been wondering when folks would start using gravitational > lensing for actual magnification and such. ---------- Hi disturbed morn pigg !! _----------------------- >Redshift 10 Galaxies? > http://www.astro.ucla.edu/~wright/cosmolog.htm#News [quoted text clipped - 24 lines] > > See: http://arxiv.org/abs/astro-ph/0701279 Would you please show how you derived the above ages, etc.? It sounds like the galaxy was in a heck of a hurry to get 32Blyr away in 13.19Byr. John Polasek >> Redshift 10 Galaxies? >> http://www.astro.ucla.edu/~wright/cosmolog.htm#News [quoted text clipped - 24 lines] >> >> See: http://arxiv.org/abs/astro-ph/0701279 > Would you please show how you derived the above ages, etc.? It sounds > like the galaxy was in a heck of a hurry to get 32Blyr away in > 13.19Byr. > John Polasek On http://www.astro.ucla.edu/~wright/CosmoCalc.html put in z=10.1 click on General >> Redshift 10 Galaxies? >> http://www.astro.ucla.edu/~wright/cosmolog.htm#News [quoted text clipped - 28 lines] > 13.19Byr. > John Polasek Here's what you need, John, the comoving radial distance, http://www.astro.ucla.edu/~wright/cosmo_02.htm#DH >>> Redshift 10 Galaxies? >>> http://www.astro.ucla.edu/~wright/cosmolog.htm#News [quoted text clipped - 31 lines] > Here's what you need, John, the comoving radial distance, > http://www.astro.ucla.edu/~wright/cosmo_02.htm#DH Thanks a lot. I haven't got it all figured out yet. The calculator is nifty; the equations are not so easy. John Polasek Sam It makes more reality to go with my size of the universe in this spacetime. It has the distance from the big bang as 22 billion LY That answers more hard question. When Iwas a kid and read my first astronomer book in the Boston library. the universe was the size of the Milky Way. It has grown in size a lot over the years Bert |
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