The 21 cm signature of shock heated and diffuse cosmic string wakes

Journal Article · Sun Jul 01 00:00:00 EDT 2012 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2012/07/032· OSTI ID:22280041

Hernández, Oscar F. ^[1]

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1. Marianopolis College, 4873 Westmount Ave., Westmount, QC H3Y 1X9 (Canada)

The analysis of the 21 cm signature of cosmic string wakes is extended in several ways. First we consider the constraints on Gμ from the absorption signal of shock heated wakes laid down much later than matter radiation equality. Secondly we analyze the signal of diffuse wake, that is those wakes in which there is a baryon overdensity but which have not shock heated. Finally we compare the size of these signals to the expected thermal noise per pixel which dominates over the background cosmic gas brightness temperature and find that the cosmic string signal will exceed the thermal noise of an individual pixel in the Square Kilometre Array for string tensions Gμ > 2.5 × 10{sup −8}.

• OSTI ID: 22280041
• Journal Information: Journal of Cosmology and Astroparticle Physics, Vol. 2012, Issue 07; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ABSORPTION
ASTROPHYSICS
BARYONS
BRIGHTNESS
COMPARATIVE EVALUATIONS
COSMOLOGY
NOISE
STRING MODELS