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Title: The gamma-ray millisecond pulsar deathline, revisited: New velocity and distance measurements

Abstract

Context. Millisecond pulsars (MSPs) represent nearly half of the more than 160 currently known γ-ray pulsars detected by the Large Area Telescope on the Fermi satellite, and a third of all known MSPs are seen in rays. The least energetic γ-ray MSPs enable us to probe the so-called deathline for high-energy emission, i.e., the spin-down luminosity limit under which pulsars (PSRs) cease to produce detectable high-energy radiation. Characterizing the MSP luminosity distribution helps to determine their contribution to the Galactic diffuse γ-ray emission. Aims. Because of the Shklovskii effect, precise proper motion and distance measurements are key ingredients for determining the spindown luminosities of MSPs accurately. Our aim is to obtain new measurements of these parameters for γ-ray MSPs when possible, and clarify the relationship between the γ-ray luminosity of pulsars and their spin-down luminosity. Detecting low spin-down luminosity pulsars in rays and characterizing their spin properties is also particularly interesting for constraining the deathline for high-energy emission. Methods. We made use of the high-quality pulsar timing data recorded at the Nançay Radio Telescope over several years to characterize the properties of a selection of MSPs. For one of the pulsars, the dataset was complemented with Westerbork Synthesis Radio Telescopemore » observations. The rotation ephemerides derived from this analysis were also used to search the LAT data for new γ-ray MSPs. Results. For the MSPs considered in this study, we obtained new transverse proper motion measurements or updated the existing ones, and placed new distance constraints for some of them, with four new timing parallax measurements. We discovered significant GeV γ-ray signals from four MSPs, i.e., PSRs J0740+6620, J0931-1902, J1455-3330, and J1730-2304. The latter is now the least energetic γ-ray pulsar found to date. Despite the improved ˙E and L estimates, the relationship between these two quantities remains unclear, especially at low ˙E values.« less

Authors:
 [1];  [2];  [2];  [3];  [1];  [4];  [5];  [6];  [7]
  1. Centre National de la Recherche Scientifique (CNRS), Univ. d'Orlean (France); CNRS/IN2P3. Univ. Paris (France). Observatoire de Paris
  2. Univ. Bordeaux (France)
  3. The Netherlands Inst. for Radio Astronomy (The Netherlands)
  4. Centre National de la Recherche Scientifique (CNRS), Univ. d'Orlean (France); CNRS/IN2P3. Univ. Paris (France). Observatoire de Paris.
  5. Max Planck Inst. for for Radio Astronomy, Bonn (Germany)
  6. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
  7. Naval Research Lab. (NRL), Washington, DC (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1355686
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Astronomy and Astrophysics
Additional Journal Information:
Journal Volume: 587; Journal ID: ISSN 0004-6361
Publisher:
EDP Sciences
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; Gamma rays; Pulsars; Parallaxes

Citation Formats

Guillemot, L., Smith, D. A., Laffon, H., Janssen, G. H., Cognard, I., Theureau, G., Desvignes, G., Ferrara, E. C., and Ray, P. S. The gamma-ray millisecond pulsar deathline, revisited: New velocity and distance measurements. United States: N. p., 2016. Web. doi:10.1051/0004-6361/201527847.
Guillemot, L., Smith, D. A., Laffon, H., Janssen, G. H., Cognard, I., Theureau, G., Desvignes, G., Ferrara, E. C., & Ray, P. S. The gamma-ray millisecond pulsar deathline, revisited: New velocity and distance measurements. United States. doi:10.1051/0004-6361/201527847.
Guillemot, L., Smith, D. A., Laffon, H., Janssen, G. H., Cognard, I., Theureau, G., Desvignes, G., Ferrara, E. C., and Ray, P. S. Fri . "The gamma-ray millisecond pulsar deathline, revisited: New velocity and distance measurements". United States. doi:10.1051/0004-6361/201527847. https://www.osti.gov/servlets/purl/1355686.
@article{osti_1355686,
title = {The gamma-ray millisecond pulsar deathline, revisited: New velocity and distance measurements},
author = {Guillemot, L. and Smith, D. A. and Laffon, H. and Janssen, G. H. and Cognard, I. and Theureau, G. and Desvignes, G. and Ferrara, E. C. and Ray, P. S.},
abstractNote = {Context. Millisecond pulsars (MSPs) represent nearly half of the more than 160 currently known γ-ray pulsars detected by the Large Area Telescope on the Fermi satellite, and a third of all known MSPs are seen in rays. The least energetic γ-ray MSPs enable us to probe the so-called deathline for high-energy emission, i.e., the spin-down luminosity limit under which pulsars (PSRs) cease to produce detectable high-energy radiation. Characterizing the MSP luminosity distribution helps to determine their contribution to the Galactic diffuse γ-ray emission. Aims. Because of the Shklovskii effect, precise proper motion and distance measurements are key ingredients for determining the spindown luminosities of MSPs accurately. Our aim is to obtain new measurements of these parameters for γ-ray MSPs when possible, and clarify the relationship between the γ-ray luminosity of pulsars and their spin-down luminosity. Detecting low spin-down luminosity pulsars in rays and characterizing their spin properties is also particularly interesting for constraining the deathline for high-energy emission. Methods. We made use of the high-quality pulsar timing data recorded at the Nançay Radio Telescope over several years to characterize the properties of a selection of MSPs. For one of the pulsars, the dataset was complemented with Westerbork Synthesis Radio Telescope observations. The rotation ephemerides derived from this analysis were also used to search the LAT data for new γ-ray MSPs. Results. For the MSPs considered in this study, we obtained new transverse proper motion measurements or updated the existing ones, and placed new distance constraints for some of them, with four new timing parallax measurements. We discovered significant GeV γ-ray signals from four MSPs, i.e., PSRs J0740+6620, J0931-1902, J1455-3330, and J1730-2304. The latter is now the least energetic γ-ray pulsar found to date. Despite the improved ˙E and L estimates, the relationship between these two quantities remains unclear, especially at low ˙E values.},
doi = {10.1051/0004-6361/201527847},
journal = {Astronomy and Astrophysics},
number = ,
volume = 587,
place = {United States},
year = {2016},
month = {2}
}

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