Advanced search
1 file | 1.30 MB

A magnified young galaxy from about 500 million years after the Big Bang

(2012) NATURE. 489(7416). p.406-408
Author
Organization
Abstract
Re-ionization of the intergalactic medium occurred in the early Universe at redshift z approximate to 6-11, following the formation of the first generation of stars(1). Those young galaxies (where the bulk of stars formed) at a cosmic age of less than about 500 million years (z less than or similar to 10) remain largely unexplored because they are at or beyond the sensitivity limits of existing large telescopes. Understanding the properties of these galaxies is critical to identifying the source of the radiation that re-ionized the intergalactic medium. Gravitational lensing by galaxy clusters allows the detection of high-redshift galaxies fainter than what otherwise could be found in the deepest images of the sky(2). Here we report multiband observations of the cluster MACS J1149+2223 that have revealed (with high probability) a gravitationally magnified galaxy from the early Universe, at a redshift of z = 9.6 +/- 0.2 (that is, a cosmic age of 490 +/- 15 million years, or 3.6 per cent of the age of the Universe). We estimate that it formed less than 200 million years after the Big Bang (at the 95 per cent confidence level), implying a formation redshift of less than or similar to 14. Given the small sky area that our observations cover, faint galaxies seem to be abundant at such a young cosmic age, suggesting that they may be the dominant source for the early re-ionization of the intergalactic medium.
Keywords
SIMILAR-TO 7, STELLAR POPULATION SYNTHESIS, DEEP SURVEY, CLUSTER, BRIGHT, DISCOVERY, HUBBLE, MACS, REIONIZATION, CALIBRATION

Downloads

  • (...).pdf
    • full text
    • |
    • UGent only
    • |
    • PDF
    • |
    • 1.30 MB

Citation

Please use this url to cite or link to this publication:

Chicago
Zheng, Wei, Marc Postman, Adi Zitrin, John Moustakas, Xinwen Shu, Stephanie Jouvel, Ole Host, et al. 2012. “A Magnified Young Galaxy from About 500 Million Years After the Big Bang.” Nature 489 (7416): 406–408.
APA
Zheng, W., Postman, M., Zitrin, A., Moustakas, J., Shu, X., Jouvel, S., Host, O., et al. (2012). A magnified young galaxy from about 500 million years after the Big Bang. NATURE, 489(7416), 406–408.
Vancouver
1.
Zheng W, Postman M, Zitrin A, Moustakas J, Shu X, Jouvel S, et al. A magnified young galaxy from about 500 million years after the Big Bang. NATURE. 2012;489(7416):406–8.
MLA
Zheng, Wei, Marc Postman, Adi Zitrin, et al. “A Magnified Young Galaxy from About 500 Million Years After the Big Bang.” NATURE 489.7416 (2012): 406–408. Print.
@article{8573766,
  abstract     = {Re-ionization of the intergalactic medium occurred in the early Universe at redshift z approximate to 6-11, following the formation of the first generation of stars(1). Those young galaxies (where the bulk of stars formed) at a cosmic age of less than about 500 million years (z less than or similar to 10) remain largely unexplored because they are at or beyond the sensitivity limits of existing large telescopes. Understanding the properties of these galaxies is critical to identifying the source of the radiation that re-ionized the intergalactic medium. Gravitational lensing by galaxy clusters allows the detection of high-redshift galaxies fainter than what otherwise could be found in the deepest images of the sky(2). Here we report multiband observations of the cluster MACS J1149+2223 that have revealed (with high probability) a gravitationally magnified galaxy from the early Universe, at a redshift of z = 9.6 +/- 0.2 (that is, a cosmic age of 490 +/- 15 million years, or 3.6 per cent of the age of the Universe). We estimate that it formed less than 200 million years after the Big Bang (at the 95 per cent confidence level), implying a formation redshift of less than or similar to 14. Given the small sky area that our observations cover, faint galaxies seem to be abundant at such a young cosmic age, suggesting that they may be the dominant source for the early re-ionization of the intergalactic medium.},
  author       = {Zheng, Wei and Postman, Marc and Zitrin, Adi and Moustakas, John and Shu, Xinwen and Jouvel, Stephanie and Host, Ole and Molino, Alberto and Bradley, Larry and Coe, Dan and Moustakas, Leonidas A and Carrasco, Mauricio and Ford, Holland and Benitez, Narciso and Lauer, Tod R and Seitz, Stella and Bouwens, Rychard and Koekemoer, Anton and Medezinski, Elinor and Bartelmann, Matthias and Broadhurst, Tom and Donahue, Megan and Grillo, Claudio and Infante, Leopoldo and Jha, Saurabh W and Kelson, Daniel D and Lahav, Ofer and Lemze, Doron and Melchior, Peter and Meneghetti, Massimo and Merten, Julian and Nonino, Mario and Ogaz, Sara and Rosati, Piero and Umetsu, Keiichi and van der Wel, Arjen},
  issn         = {0028-0836},
  journal      = {NATURE},
  language     = {eng},
  number       = {7416},
  pages        = {406--408},
  title        = {A magnified young galaxy from about 500 million years after the Big Bang},
  url          = {http://dx.doi.org/10.1038/nature11446},
  volume       = {489},
  year         = {2012},
}

Altmetric
View in Altmetric
Web of Science
Times cited: