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

Journal Article · · The Astrophysical Journal

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.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE
Contributing Organization:
Fermi-LAT Collaboration
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1357430
Journal Information:
The Astrophysical Journal, Vol. 705, Issue 1; ISSN 0004-637X
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 97 works
Citation information provided by
Web of Science

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Cited By (27)

Predicted gamma-ray line emission from the Cygnus complex journal February 2010
Identification of HESS J1303−631 as a pulsar wind nebula through γ -ray, X-ray, and radio observations journal November 2012
The Massive Star-Forming Region Cygnus ob2. ii. Integrated Stellar Properties and the star Formation History journal March 2010
DISCOVERY OF NINE GAMMA-RAY PULSARS IN FERMI LARGE AREA TELESCOPE DATA USING A NEW BLIND SEARCH METHOD journal December 2011
FERMI LARGE AREA TELESCOPE FIRST SOURCE CATALOG journal May 2010
THE SECOND FERMI LARGE AREA TELESCOPE CATALOG OF GAMMA-RAY PULSARS journal September 2013
Examining The Fermi-LAT Third Source Catalog in search of dark matter subhalos journal December 2015
The binary nature of PSR J2032+4127 journal May 2015
The massive star population of Cygnus OB2 journal March 2015
Multiwavelength monitoring and X-ray brightening of Be X-ray binary PSR J2032+4127/MT91 213 on its approach to periastron journal September 2016
Pulsed radio emission from the Fermi -LAT pulsar J1732−3131: search and a possible detection at 34.5 MHz : Periodic radio pulses from J1732−3131 journal August 2012
Modulated High-Energy Gamma-Ray Emission from the Microquasar Cygnus X-3 journal November 2009
A Cocoon of Freshly Accelerated Cosmic Rays Detected by Fermi in the Cygnus Superbubble journal November 2011
Pulsar Searching and Timing journal January 2013
The Einstein@Home Gamma-ray Pulsar Survey. II. Source Selection, Spectral Analysis, and Multiwavelength Follow-up journal February 2018
The X-Ray Modulation of PSR J2032+4127/MT91 213 during the Periastron Passage in 2017 journal April 2018
A Very High Energy γ -Ray Survey toward the Cygnus Region of the Galaxy journal July 2018
X-Ray and Radio Variabilities of PSR J2032+4127 near Periastron journal August 2019
X-Ray Spectral Evolution of PSR J2032+4127 during the 2017 Periastron Passage journal August 2019
Optical Spectral Evolution of the Gamma-Ray Binary PSR J2032+4127/MT91 213 Toward Its 2017 Periastron Passage journal February 2019
The Second Fermi Large area Telescope Catalog of Gamma-Ray Pulsars text January 2013
A Very High Energy γ -Ray Survey toward the Cygnus Region of the Galaxy text January 2018
Predicted gamma-ray line emission from the Cygnus complex text January 2010
The Binary Nature of PSR J2032+4127 preprint January 2015
Multiwavelength monitoring and X-ray brightening of Be X-ray binary PSR J2032+4127/MT91 213 on its approach to periastron text January 2016
The Einstein@Home Gamma-Ray Pulsar Survey II. Source Selection, Spectral Analysis and Multi-wavelength Follow-up text January 2017
The X-ray modulation of PSR J2032+4127/MT91 213 during the Periastron Passage in 2017 text January 2018