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Broadband pulsations from PSR B1821-24: Implications for emission models and the pulsar population of M28

Journal Article · · The Astrophysical Journal
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  1. National Academy of Sciences, Washington, D.C. (United States); Naval Research Lab., Washington, D.C. (United States)
  2. Max-Planck-Institut fur Radioastronomie, Bonn (Germany)
  3. Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
  4. Lab. de Physique et Chimie de l'Environnement, Orleans Cedex (France); Observatoire de Paris, Nancay (France)
  5. Naval Research Lab., Washington, D.C. (United States)
  6. Univ. Laval, Quebec (Canada)
  7. The Univ. of Manchester, Manchester (United Kingdom)
  8. North-West Univ., Potchefstroom (South Africa)
  9. CEA-IRFU/CNRS/Univ. Paris Diderot, Gif sur Yvette (France)
  10. Univ. of British Columbia, Vancouver, BC (Canada)
  11. Columbia Univ., New York, NY (United States); Arecibo Observatory, Arecibo, Puerto Rico (United States)
  12. The Univ. of Manchester, Manchester (United Kingdom); Pontificia Univ. Catolica de Chile, Santiago (Chile)
  13. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
  14. Australia Telescope National Facility, Epping, NSW (Australia)
  15. Max-Planck-Institut fur Radioastronomie, Bonn (Germany); The Univ. of Manchester, Manchester (United Kingdom)
  16. National Radio Astronomy Observatory (NRAO), Charlottesville, VA (United States)
  17. Univ. Bordeaux, Gradignan Cedex (France)
  18. Lab. de Physique et Chimie de l'Environnement, Orleans Cedex (France)
  19. Willamette Univ., Salem, OR (United States)
+ Show Author Affiliations
Here, we report a 5.4σ detection of pulsed gamma rays from PSR B1821–24 in the globular cluster M28 using ~44 months of Fermi Large Area Telescope (LAT) data that have been reprocessed with improved instrument calibration constants. We constructed a phase-coherent ephemeris, with post-fit residual rms of 3 μs, using radio data spanning ~23.2 yr, enabling measurements of the multi-wavelength light-curve properties of PSR B1821–24 at the milliperiod level. We fold RXTE observations of PSR B1821–24 from 1996 to 2007 and discuss implications on the emission zones. The gamma-ray light curve consists of two peaks separated by 0.41 ± 0.02 in phase, with the first gamma-ray peak lagging behind the first radio peak by 0.05 ± 0.02 in phase, consistent with the phase of giant radio pulses. We observe significant emission in the off-peak interval of PSR B1821–24 with a best-fit LAT position inconsistent with the core of M28. We do not detect significant gamma-ray pulsations at the spin or orbital periods from any other known pulsar in M28, and we place limits on the number of energetic pulsars in the cluster. The derived gamma-ray efficiency, ~2%, is typical of other gamma-ray pulsars with comparable spin-down power, suggesting that the measured spin-down rate (2.2 × 1036 erg s–1) is not appreciably distorted by acceleration in the cluster potential. This confirms PSR B1821–24 as the second very energetic millisecond pulsar in a globular cluster and raises the question of whether these represent a separate class of objects that only form in regions of very high stellar density.
Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1356550
Alternate ID(s):
OSTI ID: 22341948
Journal Information:
The Astrophysical Journal, Journal Name: The Astrophysical Journal Journal Issue: 2 Vol. 778; ISSN 0004-637X
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (14)

FERMI LARGE AREA TELESCOPE THIRD SOURCE CATALOG journal June 2015
Long-term observations of the pulsars in 47 Tucanae – II. Proper motions, accelerations and jerks journal June 2017
Correlated timing noise and high-precision pulsar timing: measuring frequency second derivatives as an example journal July 2019
Upgraded Giant Metrewave Radio Telescope timing of NGC 1851A: a possible millisecond pulsar − neutron star system journal September 2019
Milky Way globular clusters in γ-rays: analysing the dynamical formation of millisecond pulsars journal March 2019
Comment on “Understanding the γ -ray emission from the globular cluster 47 Tuc: Evidence for dark matter?” journal September 2019
First Search for Gravitational Waves from Known Pulsars with Advanced LIGO journal April 2017
High-precision X-Ray Timing of Three Millisecond Pulsars with NICER : Stability Estimates and Comparison with Radio journal April 2019
Searches for Gravitational Waves from Known Pulsars at Two Harmonics in 2015–2017 LIGO Data journal June 2019
First search for gravitational waves from known pulsars with Advanced LIGO text January 2017
Comment on "Understanding the $γ$-ray emission from the globular cluster 47 Tuc: evidence for dark matter?" text January 2018
Searches for Gravitational Waves from Known Pulsars at Two Harmonics in 2015-2017 LIGO Data text January 2019
Correlated timing noise and high precision pulsar timing: Measuring frequency second derivatives as an example text January 2019
Upgraded Giant Metrewave Radio Telescope timing of NGC 1851A: a possible millisecond pulsar-neutron star system text January 2019

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Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
gamma rays: stars
globular clusters: individual (M28)
pulsars: individual (B1821–24)