The Third Fermi Large Area Telescope Catalog of Gamma-Ray Pulsars

Abstract

We present 294 pulsars found in GeV data from the Large Area Telescope (LAT) on the Fermi Gamma-ray Space Telescope. Another 33 millisecond pulsars (MSPs) discovered in deep radio searches of LAT sources will likely reveal pulsations once phase-connected rotation ephemerides are achieved. A further dozen optical and/or X-ray binary systems colocated with LAT sources also likely harbor gamma-ray MSPs. This catalog thus reports roughly 340 gamma-ray pulsars and candidates, 10% of all known pulsars, compared to ≤11 known before Fermi. Half of the gamma-ray pulsars are young. Of these, the half that are undetected in radio have a broader Galactic latitude distribution than the young radio-loud pulsars. The others are MSPs, with six undetected in radio. Overall, ≥236 are bright enough above 50 MeV to fit the pulse profile, the energy spectrum, or both. For the common two-peaked profiles, the gamma-ray peak closest to the magnetic pole crossing generally has a softer spectrum. The spectral energy distributions tend to narrow as the spindown power E ̇ decreases to its observed minimum near 1033 erg s−1, approaching the shape for synchrotron radiation from monoenergetic electrons. We calculate gamma-ray luminosities when distances are available. Our all-sky gamma-ray sensitivity map is useful for population syntheses. The electronic catalog version provides gamma-ray pulsar ephemerides, properties, and fit results to guide and be compared with modeling results.

Chandra X-Ray Observatory Observations of 13 Fermi LAT Sources

“…In the 13 4FGL fields, eight LAT sources have been associated with γ-ray pulsars (discovered after our CXO programs were approved) that were detected in the third Fermi LAT catalog of γ-ray pulsars (3PC; see Table 4; Clark et al 2015Clark et al , 2017Smith et al 2023). Two of the γ-ray pulsars, PSR J1906+0722 and PSR J1105-6037, have been relatively well studied, and their positions are known very precisely (Clark et al 2015(Clark et al , 2017.…”

“…4.1.3. 4FGL J1104.9-6037 4FGL J1104.9-6037 has been associated with the γ-ray pulsar PSR J1105-6037, identified by the 3PC (Clark et al 2017;Smith et al 2023). A potential X-ray counterpart, 1SXPS J110500.3-603713, was reported in Wu et al (2018), with an observed flux of 2.5 10…”

“…4.1.4. 4FGL J1736.1-3422 4FGL J1736.1-3422 has been associated with the γ-ray pulsar PSR J1736-3422, identified by the 3PC (Smith et al 2023). No X-ray source is seen in the ACIS-I image within 10¢¢ from the position of the γ-ray pulsar.…”

“…4.1.6. 4FGL J1203.9-6242 4FGL J1203.9-6242 has been associated with the γ-ray pulsar PSR J1203-6242, discovered by the 3PC (Smith et al 2023). The pulsar is not significantly detected by wavdetect at the preliminary localization from the 4FGL-DR4 catalog within an assumed PU of 10¢¢, with only a slight hint of enhanced emission seen in the ACIS-I image.…”

“…4.1.8. 4FGL J2035.0+3632 4FGL J2035.0+3632 has been associated with the γ-ray pulsar PSR J2034+3632, discovered by the 3PC (Smith et al 2023). This is an MSP with a rather low spin-down power E 10 33  » erg s −1 .…”