A multiwavelength study on the high-energy behaviour of Fermi/LAT pulsars

Abstract

Using archival as well as freshly acquired data, we assess the X-ray behaviour of the Fermi/LAT gamma-ray pulsars listed in the First Fermi source catalog. After revisiting the relationships between the pulsars' rotational energy losses and their X and gamma-ray luminosities, we focus on the distance-indipendent gamma to X-ray flux ratios. When plotting our Fgamma/Fx values as a function of the pulsars' rotational energy losses, one immediately sees that pulsars with similar energetics have Fgamma/Fx spanning 3 decades. Such spread, most probably stemming from vastly different geometrical configurations of the X and gamma-ray emitting regions, defies any straightforward interpretation of the plot. Indeed, while energetic pulsars do have low Fgamma/Fx values, little can be said for the bulk of the Fermi neutron stars. Dividing our pulsar sample into radio-loud and radio-quiet subsamples, we find that, on average, radio-quiet pulsars do have higher values of Fgamma/Fx, implying an intrinsec faintness of their X-ray emission and/or a different geometrical configuration. Moreover, despite the large spread mentioned above, statistical tests show a lower scatter in the radio-quiet dataset with respect to the radio-loud one, pointing to a somewhat more constrained geometry for the radio-quiet objects with respect to the radio-loud ones.

39 pages, 5 figures, 3 tables. To be published in Astrophysical Journal

References in corpus (12)

• The ATNF Pulsar Catalogue
• Detection of 16 Gamma-Ray Pulsars Through Blind Frequency Searches Using the Fermi LAT
• Precise Gamma-Ray Timing and Radio Observations of 17 Fermi Gamma-Ray Pulsars
• Gamma ray astrophysics: the EGRET results
• The Expansion and Radio Spectral Index of G21.5-0.9: Is PSR J1833-1034 the Youngest Pulsar?
• A Shell of Thermal X-ray Emission Associated with the Young Crab-like Remnant 3C58
• Discovery of a Highly Energetic X-ray Pulsar Powering HESS J1813-178 in the Young Supernova Remnant G12.82-0.02
• UV emission from young and middle-aged pulsars: Connecting X-rays with the optical
• The Next Geminga: Search for Radio and X-ray Pulsations from the Neutron Star Identified with 3EG J1835+5918
• X-ray observations of the Large Magellanic Cloud pulsar PSR B0540-69 and its PWN
• The Crab Nebula's Dynamical Age as Measured from its Northern Filamentary Jet
• Discovery of a New X-ray Filled Radio Supernova Remnant Around the Pulsar Wind Nebula in 3EG J1809-2328

Cited by in corpus (53)

• The Second Fermi Large Area Telescope Catalog of Gamma-ray Pulsars
• The Correlation between Dispersion Measure and X-ray Column Density from Radio Pulsars
• Classification and Ranking of Fermi LAT Gamma-ray Sources from the 3FGL Catalog using Machine Learning Techniques
• Discovery of Nine Gamma-Ray Pulsars in Fermi-LAT Data Using a New Blind Search Method
• The soft gamma-ray pulsar population: an high-energy overview
• Gamma-ray Pulsar Revolution
• NICER X-ray Observations of Seven Nearby Rotation-Powered Millisecond Pulsars
• NuSTAR Hard X-ray Survey of the Galactic Center Region II: X-ray Point Sources
• Five New Millisecond Pulsars From a Radio Survey of 14 Unidentified Fermi-LAT Gamma-ray Sources
• Chandra pulsar survey (ChaPS)
• Einstein@Home discovers a radio-quiet gamma-ray millisecond pulsar
• X-ray Census of Millisecond Pulsars in the Galactic field
• PSR J1838-0537: Discovery of a young, energetic gamma-ray pulsar
• Neutron stars - thermal emitters
• Magnetic energy dissipation and gamma-ray emission in energetic pulsars
• PSR J0357+3205: the tail of the turtle
• Radio-quiet and radio-loud pulsars: similar in Gamma-rays but different in X-rays
• X-ray and Gamma-ray Emissions from Different Evolutionary Stage of Rotation Powered Millisecond Pulsars
• The TRAPUM L-band survey for pulsars in Fermi-LAT gamma-ray sources
• Detection and timing of gamma-ray pulsations from the $707$ Hz pulsar J0952$-$0607
• The NuSTAR view of the non-thermal emission from PSR J0437-4715
• Chandra X-ray Observations of the Two Brightest Unidentified High Galactic Latitude Fermi-LAT gamma-ray Sources
• PSR J2030+3641: radio discovery and gamma-ray study of a middle-aged pulsar in the now identified Fermi-LAT source 1FGL J2030.0+3641
• Toward Identifying the Unassociated Gamma-ray Source 1FGL J1311.7-3429 with X-ray and Optical Observations
• PSR J1906+0722: An Elusive Gamma-ray Pulsar
• Classification of New X-ray Counterparts for Fermi Unassociated Gamma Ray Sources Using the Swift X-Ray Telescope
• Suzaku X-ray Follow-up Observations of Seven Unassociated Fermi-LAT Gamma-ray Sources at High Galactic Latitudes
• On the puzzling high-energy pulsations of the energetic radio-quiet $\gamma$-ray pulsar J1813$-$1246
• X-ray and Rotational Luminosity Correlation and Magnetic Heating of the Radio Pulsars
• Chandra observations of the old pulsar PSR B1451-68
• Spectral characterization of the non-thermal X-ray emission of gamma-ray pulsars
• X-ray bounds on the r-mode amplitude in millisecond pulsars
• Searches for millisecond pulsar candidates among the unidentified Fermi objects
• The Galactic bulge millisecond pulsars shining in X rays: A gamma-ray perspective
• Time evolution of the X-ray and gamma-ray fluxes of the Crab pulsar
• VLT observations of the two Fermi pulsars PSR J1357-6429 and PSR J1048-5832
• Observations of three young gamma-ray pulsars with the Gran Telescopio Canarias
• High-energy pulsations and phase-resolved spectroscopy of PSR J1741-2054
• PSR J1840-1419: A very cool neutron star
• Multiwavelength constraints on the unidentified Galactic TeV sources HESS J1427$-$608, HESS J1458$-$608, and new VHE $\gamma$-ray source candidates
• Proper motion, spectra, and timing of PSR J1813-1749 using Chandra and NICER
• VLT Suzaku observations of the Fermi pulsar PSR J1028-5819
• Classification of pulsars with Dirichlet process Gaussian mixture model
• Optical Observations of PSR J0205+6449 - the next optical pulsar?
• Differences between radio-loud and radio-quiet gamma-ray pulsars as revealed by Fermi
• A 350-MHz Green Bank Telescope Survey of Unassociated Fermi LAT Sources: Discovery and Timing of Ten Millisecond Pulsars
• New VLT observations of the Fermi pulsar PSR J1048-5832
• Thermal X-ray emission identified from the millisecond pulsar PSR J1909-3744
• Multi-wavelength emission region of gamma-ray emitting pulsars
• Searching for the optical counterparts of two young gamma-ray pulsars
• Observations of one young and three middle-aged $\gamma$-ray pulsars with the Gran Telescopio Canarias
• X-ray observations and the search for Fermi-LAT gamma-ray pulsars
• Classifying Unidentified Gamma-ray Sources