Search for redshifted 2.2 MeV neutron capture line from A0535+262 in outburst

Çalışkan, Şirin and Kalemci, Emrah and Baring, Matthew G. and Boggs, Steven E. and Kretschmar, Peter (2008) Search for redshifted 2.2 MeV neutron capture line from A0535+262 in outburst. (Accepted/In Press)

WarningThere is a more recent version of this item available.

PDF - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader


June 2005, followed by a dimmer outburst in August-September 2005. This increased intensity provided an opportunity to search for redshifted neutroncapture lines from the surface of the neutron star. If discovered, such lines would constrain the neutron star equation of state, providing the motivation of this search. The spectrometer (SPI) on board the INTEGRAL satellite observed the dimmer outburst and provided the data for this research. We have not detected a line with enough significance, with the width-dependent upper limits on the broadened and redshifted neutron capture line in the range of (2 – 11) × 10−4 photons cm−2 s−1. To our knowledge, these are the strongest upper limits on the redshifted 2.2 MeV emission from an accreting neutron star. Our analysis of the transparency of the neutron star surface for 2.2 MeV photons shows that photons have a small but finite chance of leaving the atmosphere unscattered, which diminishes the possibility of detection.

Item Type:Article
Subjects:Q Science > QB Astronomy > QB460-466 Astrophysics
Q Science > QC Physics > QC1 General
ID Code:10804
Deposited By:Emrah Kalemci
Deposited On:01 Dec 2008 13:29
Last Modified:22 Jul 2019 11:41

Available Versions of this Item

Repository Staff Only: item control page