Welcome to the Universe by unknow

Author:unknow
Language: eng
Format: epub
Publisher: Princeton University Press
Published: 2016-08-26T16:00:00+00:00

FIGURE 16.5. Spectrum of the quasar SDSS J1148+5251 at redshift 6.42. This quasar was discovered by Michael Strauss, Xiaohui Fan, and their colleagues in 2001, the highest-redshift quasar known from the time of its discovery until 2011. The light we are seeing from this quasar was emitted when the universe was less than 900 million years old. The strongest peak (emission line) in this quasar is due to emission from hydrogen atoms (the n = 2 to n = 1 transition; see figure 6.2), which has been greatly redshifted from its rest wavelength of 1,216 Ångstroms to 9,000 Ångstroms. The sharp drop in the spectrum below 9,000 Ångstroms is due to absorption from hydrogen gas between the quasar and us. Credit: Image by Michael A. Strauss using data in R. L. White, et al. 2003, Astrophysical Journal 126: 1, and A. J. Barth et al. 2003, Astrophysical Journal Letters 594: L95

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