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Title: Radio Detection of LAT PSRs J1741-2054 and J2032+4127: No Longer Just Gamma-Ray Pulsars

Abstract

We present that sixteen pulsars have been discovered so far in blind searches of photons collected with the Large Area Telescope on the Fermi Gamma-ray Space Telescope. We here report the discovery of radio pulsations from two of them. PSR J1741-2054, with period P = 413 ms, was detected in archival Parkes telescope data and subsequently has been detected at the Green Bank Telescope (GBT). Its received flux varies greatly due to interstellar scintillation and it has a very small dispersion measure of DM = 4.7 pc cm –3, implying a distance of ≈0.4 kpc and possibly the smallest luminosity of any known radio pulsar. At this distance, for isotropic emission, its gamma-ray luminosity above 0.1 GeV corresponds to 28% of the spin-down luminosity of $$\dot{E} = 9.4\times 10^{33}$$ erg s–1. The gamma-ray profile occupies 1/3 of pulse phase and has three closely spaced peaks with the first peak lagging the radio pulse by δ = 0.29 P. We have also identified a soft Swift source that is the likely X-ray counterpart. In many respects PSR J1741-2054 resembles the Geminga pulsar. The second source, PSR J2032+4127, was detected at the GBT. It has P = 143 ms, and its DM = 115 pc cm –3 suggests a distance of ≈3.6 kpc, but we consider it likely that it is located within the Cyg OB2 stellar association at half that distance. The radio emission is nearly 100% linearly polarized, and the main radio peak precedes by δ = 0.15 P the first of two narrow gamma-ray peaks that are separated by Δ = 0.50 P. The second peak has a harder spectrum than the first one, following a trend observed in young gamma-ray pulsars. Faint, diffuse X-ray emission in a Chandra image is possibly its pulsar wind nebula. Finally, the wind of PSR J2032+4127 is responsible for the formerly unidentified HEGRA source TeV J2032+4130. PSR J2032+4127 is coincident in projection with MT91 213, a Be star in Cyg OB2, although apparently not a binary companion of it.

Authors:
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Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
Contributing Org.:
Fermi-LAT Collaboration
OSTI Identifier:
1357430
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 705; Journal Issue: 1; Journal ID: ISSN 0004-637X
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; gamma rays: observations; ISM: individual (TeV J2032+4130); open clusters and associations: individual (Cyg OB2); pulsars: individual (PSR J1741-2054, PSR J2032+4127); X-rays: individual (Swift J174157.6-205411)

Citation Formats

Camilo, F., Ray, P. S., Ransom, S. M., Burgay, M., Johnson, T. J., Kerr, M., Gotthelf, E. V., Halpern, J. P., Reynolds, J., Romani, R. W., Demorest, P., Johnston, S., van Straten, W., Parkinson, P. M. Saz, Ziegler, M., Dormody, M., Thompson, D. J., Smith, D. A., Harding, A. K., Abdo, A. A., Crawford, F., Freire, P. C. C., Keith, M., Kramer, M., Roberts, M. S. E., Weltevrede, P., and Wood, K. S. Radio Detection of LAT PSRs J1741-2054 and J2032+4127: No Longer Just Gamma-Ray Pulsars. United States: N. p., 2009. Web. doi:10.1088/0004-637X/705/1/1.
Camilo, F., Ray, P. S., Ransom, S. M., Burgay, M., Johnson, T. J., Kerr, M., Gotthelf, E. V., Halpern, J. P., Reynolds, J., Romani, R. W., Demorest, P., Johnston, S., van Straten, W., Parkinson, P. M. Saz, Ziegler, M., Dormody, M., Thompson, D. J., Smith, D. A., Harding, A. K., Abdo, A. A., Crawford, F., Freire, P. C. C., Keith, M., Kramer, M., Roberts, M. S. E., Weltevrede, P., & Wood, K. S. Radio Detection of LAT PSRs J1741-2054 and J2032+4127: No Longer Just Gamma-Ray Pulsars. United States. doi:10.1088/0004-637X/705/1/1.
Camilo, F., Ray, P. S., Ransom, S. M., Burgay, M., Johnson, T. J., Kerr, M., Gotthelf, E. V., Halpern, J. P., Reynolds, J., Romani, R. W., Demorest, P., Johnston, S., van Straten, W., Parkinson, P. M. Saz, Ziegler, M., Dormody, M., Thompson, D. J., Smith, D. A., Harding, A. K., Abdo, A. A., Crawford, F., Freire, P. C. C., Keith, M., Kramer, M., Roberts, M. S. E., Weltevrede, P., and Wood, K. S. Wed . "Radio Detection of LAT PSRs J1741-2054 and J2032+4127: No Longer Just Gamma-Ray Pulsars". United States. doi:10.1088/0004-637X/705/1/1. https://www.osti.gov/servlets/purl/1357430.
@article{osti_1357430,
title = {Radio Detection of LAT PSRs J1741-2054 and J2032+4127: No Longer Just Gamma-Ray Pulsars},
author = {Camilo, F. and Ray, P. S. and Ransom, S. M. and Burgay, M. and Johnson, T. J. and Kerr, M. and Gotthelf, E. V. and Halpern, J. P. and Reynolds, J. and Romani, R. W. and Demorest, P. and Johnston, S. and van Straten, W. and Parkinson, P. M. Saz and Ziegler, M. and Dormody, M. and Thompson, D. J. and Smith, D. A. and Harding, A. K. and Abdo, A. A. and Crawford, F. and Freire, P. C. C. and Keith, M. and Kramer, M. and Roberts, M. S. E. and Weltevrede, P. and Wood, K. S.},
abstractNote = {We present that sixteen pulsars have been discovered so far in blind searches of photons collected with the Large Area Telescope on the Fermi Gamma-ray Space Telescope. We here report the discovery of radio pulsations from two of them. PSR J1741-2054, with period P = 413 ms, was detected in archival Parkes telescope data and subsequently has been detected at the Green Bank Telescope (GBT). Its received flux varies greatly due to interstellar scintillation and it has a very small dispersion measure of DM = 4.7 pc cm–3, implying a distance of ≈0.4 kpc and possibly the smallest luminosity of any known radio pulsar. At this distance, for isotropic emission, its gamma-ray luminosity above 0.1 GeV corresponds to 28% of the spin-down luminosity of $\dot{E} = 9.4\times 10^{33}$ erg s–1. The gamma-ray profile occupies 1/3 of pulse phase and has three closely spaced peaks with the first peak lagging the radio pulse by δ = 0.29 P. We have also identified a soft Swift source that is the likely X-ray counterpart. In many respects PSR J1741-2054 resembles the Geminga pulsar. The second source, PSR J2032+4127, was detected at the GBT. It has P = 143 ms, and its DM = 115 pc cm–3 suggests a distance of ≈3.6 kpc, but we consider it likely that it is located within the Cyg OB2 stellar association at half that distance. The radio emission is nearly 100% linearly polarized, and the main radio peak precedes by δ = 0.15 P the first of two narrow gamma-ray peaks that are separated by Δ = 0.50 P. The second peak has a harder spectrum than the first one, following a trend observed in young gamma-ray pulsars. Faint, diffuse X-ray emission in a Chandra image is possibly its pulsar wind nebula. Finally, the wind of PSR J2032+4127 is responsible for the formerly unidentified HEGRA source TeV J2032+4130. PSR J2032+4127 is coincident in projection with MT91 213, a Be star in Cyg OB2, although apparently not a binary companion of it.},
doi = {10.1088/0004-637X/705/1/1},
journal = {Astrophysical Journal},
number = 1,
volume = 705,
place = {United States},
year = {2009},
month = {10}
}

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