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Title:
Search for radio pulsations in AMXPs
Authors:
Iacolina, M. N.; Burgay, M.; Burderi, L.; Possenti, A.; di Salvo, T.
Affiliation:
AA(Università di Cagliari, Dipartimento di Fisica, SP Monserrato-Sestu km 0.7, 09042 Monserrato (CA), Italy), AB(INAF-Osservatorio Astronomico di Cagliari, Loc. Poggio dei Pini, Strada 54, 09012 Capoterra (CA), Italy), AC(Università di Cagliari, Dipartimento di Fisica, SP Monserrato-Sestu km 0.7, 09042 Monserrato (CA), Italy), AD(INAF-Osservatorio Astronomico di Cagliari, Loc. Poggio dei Pini, Strada 54, 09012 Capoterra (CA), Italy), AE(Università di Palermo, Dipartimento di Scienze Fisiche ed Astronomiche, via Archirafi 36, 90123 Palermo, Italy)
Publication:
A DECADE OF ACCRETING MILLISECOND X-RAY PULSARS. AIP Conference Proceedings, Volume 1068, pp. 125-129 (2008). (AIPC Homepage)
Publication Date:
10/2008
Origin:
AIP
PACS Keywords:
Pulsars, Accretion and accretion disks, X-ray binaries
DOI:
10.1063/1.3031182
Bibliographic Code:
2008AIPC.1068..125I

Abstract

We have carried out a search for radio pulsed emission from the Accreting Millisecond X-ray pulsars (AMXPs) XTE J0929-314, XTE J1751-305 and XTE J1814-338 at 6.5 and 8.5 GHz, observed during their X-Ray quiescent phase. The detection of radio signals, in the quiescent phase of this kind of transient systems, would give a ultimate proof of the recycling model, unambiguously establishing that the AMXPs are the progenitors of the Radio millisecond pulsars. For the first source we can conclude that no radio pulsation is present in the analyzed data down to a limit of 68 μJy at 6.4 GHz and 26 μJy at 8.5 GHz. We discuss several mechanisms that could prevent the detection and suggest that the free-free absorption cannot be responsible for the lack of a detection, given the relatively high used radio frequencies, while the beaming factor and the intrinsic low luminosity are viable explanations for the non detection of radio pulsation. For the other two sources the work is now in progress.
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