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A unified binary neutron star merger magnetar model for the Chandra X-ray transients CDF-S XT1 and XT2 | Hui Sun
; Ye Li
; Binbin Zhang
; Bing Zhang
; Franz E. Bauer
; Yongquan Xue
; Weimin Yuan
; | Date: |
3 Aug 2019 | Abstract: | Two bright X-ray transients were reported from the Chandra Deep Field South
archival data, namely CDF-S XT1 and XT2. Whereas the nature of the former is
not identified, the latter was suggested as an excellent candidate for a
rapidly spinning magnetar born from a binary neutron star (BNS) merger. Here we
propose a unified model to interpret both transients within the framework of
the BNS merger magnetar model. According to our picture, CDF-S XT2 is observed
from the ’’free zone’’ where the magnetar spindown powered X-ray emission
escapes freely, whereas CDF-S XT1 originates from the ’’trapped zone’’ where
the X-ray emission is initially blocked by the dynamical ejecta and becomes
transparent after the ejecta is pushed to a distance where Thomson optical
depth drops below unity. We fit the magnetar model to the light curves of both
transients and derived consistent parameters for the two events, with magnetic
field, initial spin period and X-ray emission efficiency being
($B_p=10^{16},G$, $P=1.2,
m ms$, $eta = 0.001$) and ($B_p=10^{15.8},G$,
$P=4.4,
m ms$, $eta = 0.001$) for XT1 and XT2, respectively. The ejecta
mass of XT1 is fitted to be $M_{
m ej} = 10^{-3}$ $M_{odot}$, while it is not
constrained for XT2. Our results suggest that more extreme magnetar parameters
are required to have XT1 detected in the trapped zone. These values are
consistent with those derived from SGRB X-ray plateau observations. The host
galaxy properties of both transients are also consistent with those of SGRBs.
The event rate densities of both XT1 and XT2 are consistent with that of BNS
mergers. | Source: | arXiv, 1908.1107 | Services: | Forum | Review | PDF | Favorites |
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