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Radio imaging observations of PSR J1023+0038 in an LMXB state | | A. T. Deller
; J. Moldón
; J. C. A. Miller-Jones
; A. Patruno
; J. W. T. Hessels
; A. M. Archibald
; Z. Paragi
; G. Heald
; N. Vilchez
; | | Date: |
16 Dec 2014 | | Abstract: | The transitional millisecond pulsar binary system PSR J1023+0038 re-entered
an accreting state in 2013 June, in which it bears many similarities to
low-mass X-ray binaries (LMXBs) in quiescence or near-quiescence. At a distance
of just 1.37 kpc, PSR J1023+0038 offers an unsurpassed ability to study
low-level accretion onto a highly-magnetized compact object. We have monitored
PSR J1023+0038 intensively using radio imaging with the Karl G. Jansky Very
Large Array, the European VLBI Network and LOFAR, seeing rapidly variable, flat
spectrum emission that persists over a period of 6 months. The flat spectrum
and variability is indicative of synchrotron emission originating in an outflow
from the system, most likely in the form of a compact, partially self-absorbed
jet, as is seen in LMXBs at higher accretion rates. The radio brightness,
however, greatly exceeds extrapolations made from observations of more
vigorously accreting neutron star LMXB systems. We postulate that PSR
J1023+0038 is undergoing radiatively inefficient ’propeller-mode’ accretion,
with the jet carrying away a dominant fraction of the liberated accretion
luminosity. We confirm that the enhanced gamma-ray emission seen in PSR
J1023+0038 since it re-entered an accreting state has been maintained; the
increased gamma-ray emission in this state can also potentially be associated
with propeller-mode accretion. Similar accretion modes can be invoked to
explain the radio and X-ray properties of the other two known transitional
millisecond pulsar systems XSS J12270-4859 and PSR J1824-2452I (M28I),
suggesting that radiatively inefficient accretion may be an ubiquitous
phenomenon amongst (at least one class of) neutron star binaries at low
accretion rates. | | Source: | arXiv, 1412.5155 | | Services: | Forum | Review | PDF | Favorites | |
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