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Title: Multiwavelength Observations of the Redback Millisecond Pulsar J1048+2339

In this paper, we report on radio timing and multiwavelength observations of the 4.66 ms redback pulsar J1048+2339, which was discovered in an Arecibo search targeting the Fermi-Large Area Telescope source 3FGL J1048.6+2338. Two years of timing allowed us to derive precise astrometric and orbital parameters for the pulsar. PSR J1048+2339 is in a 6 hr binary and exhibits radio eclipses over half the orbital period and rapid orbital period variations. The companion has a minimum mass of 0.3 M , and we have identified a V ~ 20 variable optical counterpart in data from several surveys. The phasing of its ~1 mag modulation at the orbital period suggests highly efficient and asymmetric heating by the pulsar wind, which may be due to an intrabinary shock that is distorted near the companion, or to the companion's magnetic field channeling the pulsar wind to specific locations on its surface. Finally, we also present gamma-ray spectral analysis of the source and preliminary results from searches for gamma-ray pulsations using the radio ephemeris.
ORCiD logo [1] ; ORCiD logo [2] ; ORCiD logo [3] ; ORCiD logo [4] ;  [2] ; ORCiD logo [5] ;  [6] ; ORCiD logo [7] ; ORCiD logo [8] ; ORCiD logo [2] ;  [9] ;  [9]
  1. National Research Council (NRC), Washington, DC (United States). Naval Research Lab.
  2. Naval Research Lab. (NRL), Washington, DC (United States)
  3. Columbia Univ., New York, NY (United States). Columbia Astrophysics Lab.; SKA South Africa, Pinelands (South Africa)
  4. Columbia Univ., New York, NY (United States). Columbia Astrophysics Lab.
  5. Univ. of Virginia, Charlottesville, VA (United States)
  6. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
  7. Commonwealth Scientific and Industrial Research Organization (CSIRO), Marsfield, NSW (Australia). Astronomy and Space Science
  8. National Radio Astronomy Observatory, Charlottesville, VA (United States)
  9. Univ. of Hawaii, Honolulu, HI (United States). Inst. for Astronomy
Publication Date:
Grant/Contract Number:
AST-1100968; AST-0909182; AST-1238877; NNG05GF22G; NNX08AR22G
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 823; Journal Issue: 2; Journal ID: ISSN 1538-4357
Institute of Physics (IOP)
Research Org:
National Research Council (NRC), Washington, DC (United States)
Sponsoring Org:
USDOE; National Science Foundation (NSF); National Aeronautic and Space Administration (NASA)
Contributing Orgs:
Fermi-LAT Collaboration
Country of Publication:
United States
79 ASTRONOMY AND ASTROPHYSICS; pulsars; J1048+2339 pulsar; neutron stars
OSTI Identifier: