X-ray counterpart candidates for six new γ-ray pulsars

Abstract

Using archival X-ray data we have found point-like X-ray counterpart candidates positionally coincident with six γ-ray pulsars discovered recently in the Fermi Gammaray Space Telescope data by the Einstein@Home project. The candidates for PSRs J0002+6216, J0554+3107, J1844−0346 and J1105−6037 are detected with Swift, and those for PSRs J0359+5414 and J2017+3625 are detected with Chandra. Despite a low count statistics for some candidates, assuming plausible constraints on the absorbing column density towards the pulsars, we show that X-ray spectral properties for all of them are consistent with those observed for other pulsars. J0359+5414 is the most reliably identified object. We detect a nebula around it, whose spectrum and extent suggest that this is a pulsar wind nebula powered by the pulsar. Associations of J0002+6216 and J1844−0346 with supernova remnants CTB 1 and G28.6−0.1 are proposed.

The Tail of PSR J0002+6216 and the Supernova Remnant CTB 1

“…We also looked for evidence of the tail-like feature at other wavelengths. There is an X-ray point source whose position is consistent with PSR J0002+6216 (Wu et al 2018;Zyuzin et al 2018). The cometary feature is not visible in ROSAT images (Craig et al 1997), but it lies outside of the field-of-view of deeper pointings made by the narrow-field instruments of ASCA, Chandra and Suzaku (Lazendic & Slane 2006;Pannuti et al 2010;Katsuragawa et al 2018).…”

“…The two models for the Galactic distribution of ionized gas give d=7.9 kpc (Cordes & Lazio 2002) and d=6.4 kpc (Yao et al 2017), respectively, leading to a suspiciously large V P SR =3500-4300 km s −1 . Both Wu et al (2018) and Zyuzin et al (2018) have also noted that the DM distance would also require that the γ-ray efficiency of PSR J0002+6216 exceed unity. They derive a pulsar distance from an empirical relationship between the γray luminosity and Ė of 2.0 kpc and 2.3 kpc, respectively.…”

Observations of three young γ-ray pulsars with the Gran Telescopio Canarias

“…The situation is slowly improving (see, e.g. Marelli et al 2015;Zyuzin et al 2018), especially for the ≈100 more γ-ray pulsars detected since the publication of the 2PC (Abdo et al 2013). This is due to the fact that the latest γ-ray pulsars to be detected are, usually, the faintest ones and, presumably, also the faintest at other wavelengths, which limits the success of follow-up attempts.…”

A Multi-wavelength search for Black Widows and Redbacks counterparts of candidate $γ$-ray millisecond pulsars

“…Incidentally, we note that source 3XMM J035925.2+541455 lies at only 7 (slightly larger than our assumed matching radius, Sect. 3.3) from the position of 2CXO J035926.0+541455 (Table 1), which is the candidate X-ray counterpart to PSR J0359+5414 detected by Zyuzin et al (2018) in a ∼460 ks Chandra observation. The source is at the centre of a 30 -long extended X-ray emission which might have not been fully resolved by XMM-Newton, affecting its accuracy on the source position determination and the match with the Chandra one.…”