Science News
from research organizations

Stars are younger than previously thought

Date:
February 5, 2015
Source:
Sissa Medialab
Summary:
New research reveals a surprise: star formation in the Universe may be more recent than previously indicated by the analysis of Planck's predecessor, the NASA WMAP satellite.
Share:
FULL STORY

The latest data release from the ESA satellite Planck consortium reveals a surprise: star formation in the Universe may be more recent than previously indicated by the analysis of Planck's predecessor, the NASA WMAP satellite.
Credit: ESA/Planck collaboration

The latest data release from the ESA satellite Planck consortium -- just published in Astronomy and Astrophysics -- reveals a surprise: star formation in the Universe may be more recent than previously indicated by the analysis of Planck's predecessor, the NASA WMAP satellite. The observation was made possible by the new maps of Planck's low-frequency instrument (LFI), produced by the Trieste Data Processing Centre run by INAF-OATS in collaboration with the International School for Advanced Studies (SISSA) and the LFI Consortium.

The highly anticipated update of the analysis of data from the European Space Agency's Planck satellite starts with a first paper published in Astronomy and Astrophysics, which already holds in store a few major surprises. The first article in fact "rejuvenates" the stars of our Universe. Thanks to new maps of cosmic background radiation (in particular, those containing "polarization anisotropies" of radiation) scientists have found that the "reionization" process could be more recent than estimated until now.

Reionization is one of the most important processes in cosmology as it is associated with star formation, which cosmologists data back to after the "dark ages" of the Universe, when there was still no starlight. The NASA WMAP satellite, launched in 2001, had given an initial estimate of the period when the process may have taken place.

The discovery, which still requires validation by the measurements that Planck is still able to provide that will be published in about a year's time, is associated with the publication of maps of "polarized" cosmic background radiation (the first light in the Universe produced by the Big Bang). WMAP was the first satellite to attempt to provide this map, but today new Planck data suggest that reionization may have occurred approximately 550 million years after the Big Bang, i.e., 100 million years later than WMAP had estimated.

"According to Planck's observations, stars may be younger than believed, in bearing with other independent astrophysical indicators, and this finding may have major consequences on our attempts to understand the dark components of the Universe," explains Carlo Baccigalupi, SISSA cosmologist and coordinator of the SISSA group involved in the Planck experiment. "The contribution of the Trieste team involved in producing maps for the LFI on board Planck -- consisting of SISSA and INAF-OATS scientists coordinated by Andrea Zacchei -- was to generate new maps of the polarized light seen by the LFI which cover the whole sky. Now we're awaiting data from the high-frequency instrument (HFI), whose maps are mostly constructed by the French team. These additional maps should provide confirmation and a clearer picture of the evidence we detected."


Story Source:

Materials provided by Sissa Medialab. Note: Content may be edited for style and length.


Journal Reference:

  1. A. Bernui, M. J. Rebouças. Mapping possible non-Gaussianity in thePlanckmaps. Astronomy & Astrophysics, 2015; 573: A114 DOI: 10.1051/0004-6361/201424654

Cite This Page:

Sissa Medialab. "Stars are younger than previously thought." ScienceDaily. ScienceDaily, 5 February 2015. <www.sciencedaily.com/releases/2015/02/150205095157.htm>.
Sissa Medialab. (2015, February 5). Stars are younger than previously thought. ScienceDaily. Retrieved May 24, 2017 from www.sciencedaily.com/releases/2015/02/150205095157.htm
Sissa Medialab. "Stars are younger than previously thought." ScienceDaily. www.sciencedaily.com/releases/2015/02/150205095157.htm (accessed May 24, 2017).

MORE COVERAGE

RELATED STORIES