SEARCH FOR GRAVITATIONALLY REDSHIFTED 2.2 MEV LINE FROM 4U 1820-30

Calışkan, Şirin and Kalemci, Emrah and Boggs, Steven E. (2007) SEARCH FOR GRAVITATIONALLY REDSHIFTED 2.2 MEV LINE FROM 4U 1820-30. In: The 6th INTEGRAL Workshop, the Obscured Universe, Moscow, Russia (Accepted/In Press)

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Abstract

We have analyzed 1.7 Ms of the INTEGRAL data of the Low Mass X-Ray Binary (LMXB) 4U 1820-30 and searched for the redshifted 2.2 MeV neutron capture gamma-ray line. This source is unique in that it is thought to be accreting pure Helium and might be a powerful 2.2 MeV line source. If detected, this line would strongly constrain the neutron star equation of state, motivating this search. The line is expected to be redshifted to 1.30-1.72 MeV so we scanned the 1-2 MeV region. Although we failed to detect the redshifted 2.2 MeV line, mainly due to the intense background noise to which INTEGRAL is exposed, we placed upper limits on the source’s flux for different line widths. We plan to do analysis on the rest of the data (over 8 Ms) in the future.
Item Type: Papers in Conference Proceedings
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Faculty of Engineering and Natural Sciences
Depositing User: Emrah Kalemci
Date Deposited: 31 Oct 2007 14:44
Last Modified: 26 Apr 2022 08:43
URI: https://research.sabanciuniv.edu/id/eprint/6820

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