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Title: Spin-down Evolution and Radio Disappearance of the Magnetar PSR J1622–4950

Abstract

We report on 2.4 yr of radio timing measurements of the magnetar PSR J1622−4950 using the Parkes Observatory, between 2011 November and 2014 March. During this period the torque on the neutron star (inferred from the rotational frequency derivative) varied greatly, though much less erratically than during the 2 yr following its discovery in 2009. During the last year of our measurements the frequency derivative decreased in magnitude monotonically by 20%, to a value of −1.3 × 10{sup −13} s{sup −2}, a factor of 8 smaller than when it was discovered. The flux density continued to vary greatly during our monitoring through 2014 March, reaching a relatively steady low level after late 2012. The pulse profile varied secularly on a similar timescale as the flux density and torque. A relatively rapid transition in all three properties was evident in early 2013. After PSR J1622−4950 was detected in all of our 87 observations up to 2014 March, we did not detect the magnetar in our resumed monitoring starting in 2015 January and have not detected it in any of the 30 observations conducted through 2016 September.

Authors:
 [1];  [2];  [3]; ;  [4]; ;  [5];  [6]; ;  [7]
  1. National Research Council of Canada, Herzberg Astronomy and Astrophysics, Dominion Radio Astrophysical Observatory, P. O. Box 248, Penticton, BC V2A 6J9 (Canada)
  2. SKA South Africa, Pinelands, 7405 (South Africa)
  3. CSIRO Parkes Observatory, Parkes, NSW 2870 (Australia)
  4. CSIRO Astronomy and Space Science, Australia Telescope National Facility, Epping, NSW 1710 (Australia)
  5. Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, Manchester M13 9PL (United Kingdom)
  6. Centre for Astrophysics and Supercomputing, Swinburne University of Technology, Mail H30, P. O. Box 218, Hawthorn, VIC 3122 (Australia)
  7. INAF—Osservatorio Astronomico di Cagliari, Via della Scienza 5, I-09047 Selargius (Italy)
Publication Date:
OSTI Identifier:
22663538
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 841; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; EVOLUTION; FLUX DENSITY; NEUTRON STARS; PULSARS; PULSES; RECREATIONAL AREAS; SPIN; TORQUE

Citation Formats

Scholz, P., Camilo, F., Sarkissian, J., Reynolds, J. E., Johnston, S., Levin, L., Kramer, M., Bailes, M., Burgay, M., and Possenti, A., E-mail: paul.scholz@nrc-cnrc.gc.ca. Spin-down Evolution and Radio Disappearance of the Magnetar PSR J1622–4950. United States: N. p., 2017. Web. doi:10.3847/1538-4357/AA73DE.
Scholz, P., Camilo, F., Sarkissian, J., Reynolds, J. E., Johnston, S., Levin, L., Kramer, M., Bailes, M., Burgay, M., & Possenti, A., E-mail: paul.scholz@nrc-cnrc.gc.ca. Spin-down Evolution and Radio Disappearance of the Magnetar PSR J1622–4950. United States. doi:10.3847/1538-4357/AA73DE.
Scholz, P., Camilo, F., Sarkissian, J., Reynolds, J. E., Johnston, S., Levin, L., Kramer, M., Bailes, M., Burgay, M., and Possenti, A., E-mail: paul.scholz@nrc-cnrc.gc.ca. Thu . "Spin-down Evolution and Radio Disappearance of the Magnetar PSR J1622–4950". United States. doi:10.3847/1538-4357/AA73DE.
@article{osti_22663538,
title = {Spin-down Evolution and Radio Disappearance of the Magnetar PSR J1622–4950},
author = {Scholz, P. and Camilo, F. and Sarkissian, J. and Reynolds, J. E. and Johnston, S. and Levin, L. and Kramer, M. and Bailes, M. and Burgay, M. and Possenti, A., E-mail: paul.scholz@nrc-cnrc.gc.ca},
abstractNote = {We report on 2.4 yr of radio timing measurements of the magnetar PSR J1622−4950 using the Parkes Observatory, between 2011 November and 2014 March. During this period the torque on the neutron star (inferred from the rotational frequency derivative) varied greatly, though much less erratically than during the 2 yr following its discovery in 2009. During the last year of our measurements the frequency derivative decreased in magnitude monotonically by 20%, to a value of −1.3 × 10{sup −13} s{sup −2}, a factor of 8 smaller than when it was discovered. The flux density continued to vary greatly during our monitoring through 2014 March, reaching a relatively steady low level after late 2012. The pulse profile varied secularly on a similar timescale as the flux density and torque. A relatively rapid transition in all three properties was evident in early 2013. After PSR J1622−4950 was detected in all of our 87 observations up to 2014 March, we did not detect the magnetar in our resumed monitoring starting in 2015 January and have not detected it in any of the 30 observations conducted through 2016 September.},
doi = {10.3847/1538-4357/AA73DE},
journal = {Astrophysical Journal},
number = 2,
volume = 841,
place = {United States},
year = {Thu Jun 01 00:00:00 EDT 2017},
month = {Thu Jun 01 00:00:00 EDT 2017}
}