Settling accretion on to isolated neutron stars from interstellar mediumстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 9 июня 2015 г.
Аннотация:We apply the model of subsonic settling accretion on to isolated neutron stars accreting from the interstellar medium (AINS). We show that in this regime the expected mean X-ray luminosity from AINS turns out to be two to three orders of magnitude as small as the maximum possible Bondi value, i.e. 1027-1028 erg s-1. The intrinsically unstable character of settling accretion due to long plasma cooling time leads to regular appearance of X-ray flares with a duration of about 1 h and a maximum luminosity of about the Bondi value, ˜1031 erg s-1. This feature can be used to distinguish AINS from other dim X-ray sources. With the sensitivity of the forthcoming all-sky X-ray surveys the expected number of the potentially detectable AINS can be from a few to 10.