PRIMORDIAL HELIUM ABUNDANCE BY RRL: NEW RESULT

PRIMORDIAL HELIUM ABUNDANCE BY RRL: NEW RESULT

New results of the Primordial Helium abundance (Yp) measurement by radio recombination lines (RRL) observations from galactic HII regions are presented. The RRL observations were carried out with two Parabolas: RT32(λ = 13.5 mm and 3.5 cm, Medicina, Italy) and RT22 (λ = 8 and 13.5 mm, Pushchino, Rus...

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Main Authors: A. P. Tsivilev, R. L. Sorochenko, St. Cortiglioni, S. Poppi, St. Montebugnoli
Format: Article
Language:English
Published: Odessa I. I. Mechnykov National University 2017-03-01
Series:Odessa Astronomical Publications
Online Access:http://oap.onu.edu.ua/article/view/93269
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spelling doaj-dd8d0742b41147339eaa2db673103ce02020-11-25T03:16:59ZengOdessa I. I. Mechnykov National UniversityOdessa Astronomical Publications1810-42152017-03-0117010310510.18524/1810-4215.2004.17.9326993269PRIMORDIAL HELIUM ABUNDANCE BY RRL: NEW RESULTA. P. Tsivilev0R. L. SorochenkoSt. CortiglioniS. PoppiSt. MontebugnoliPushchino Observatory of P.N. Lebedev Physical Institute, Pushchino Moscow reg., RussiaNew results of the Primordial Helium abundance (Yp) measurement by radio recombination lines (RRL) observations from galactic HII regions are presented. The RRL observations were carried out with two Parabolas: RT32(λ = 13.5 mm and 3.5 cm, Medicina, Italy) and RT22 (λ = 8 and 13.5 mm, Pushchino, Russia). The current value was obtained on the base of five source observations with the accurate correction for both the ionization structure and dust influence. At present, the obtained Yp = 25.74(±1.0)value seems to be higher than that suggested by optical data, allowing the presence of unknown light particles, and is in agreement with the result from cosmic microwave background asymmetry.http://oap.onu.edu.ua/article/view/93269
collection DOAJ
language English
format Article
sources DOAJ
author A. P. Tsivilev
R. L. Sorochenko
St. Cortiglioni
S. Poppi
St. Montebugnoli
spellingShingle A. P. Tsivilev
R. L. Sorochenko
St. Cortiglioni
S. Poppi
St. Montebugnoli
PRIMORDIAL HELIUM ABUNDANCE BY RRL: NEW RESULT
Odessa Astronomical Publications
author_facet A. P. Tsivilev
R. L. Sorochenko
St. Cortiglioni
S. Poppi
St. Montebugnoli
author_sort A. P. Tsivilev
title PRIMORDIAL HELIUM ABUNDANCE BY RRL: NEW RESULT
title_short PRIMORDIAL HELIUM ABUNDANCE BY RRL: NEW RESULT
title_full PRIMORDIAL HELIUM ABUNDANCE BY RRL: NEW RESULT
title_fullStr PRIMORDIAL HELIUM ABUNDANCE BY RRL: NEW RESULT
title_full_unstemmed PRIMORDIAL HELIUM ABUNDANCE BY RRL: NEW RESULT
title_sort primordial helium abundance by rrl: new result
publisher Odessa I. I. Mechnykov National University
series Odessa Astronomical Publications
issn 1810-4215
publishDate 2017-03-01
description New results of the Primordial Helium abundance (Yp) measurement by radio recombination lines (RRL) observations from galactic HII regions are presented. The RRL observations were carried out with two Parabolas: RT32(λ = 13.5 mm and 3.5 cm, Medicina, Italy) and RT22 (λ = 8 and 13.5 mm, Pushchino, Russia). The current value was obtained on the base of five source observations with the accurate correction for both the ionization structure and dust influence. At present, the obtained Yp = 25.74(±1.0)value seems to be higher than that suggested by optical data, allowing the presence of unknown light particles, and is in agreement with the result from cosmic microwave background asymmetry.
url http://oap.onu.edu.ua/article/view/93269
work_keys_str_mv AT aptsivilev primordialheliumabundancebyrrlnewresult
AT rlsorochenko primordialheliumabundancebyrrlnewresult
AT stcortiglioni primordialheliumabundancebyrrlnewresult
AT spoppi primordialheliumabundancebyrrlnewresult
AT stmontebugnoli primordialheliumabundancebyrrlnewresult
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