THE 1st LHAASO SYMPOSIUM

TeV emission surrounding the high galactic latitude pulsar J1740+1000: a possible pulsar halo or a TeV source from the tail of bow shock

Not scheduled

35m

Tianfu Cosmic Ray Research Centre

oral

Speaker

Renfeng Xu (Institute of High Energy Physics, CAS)

Description

We report the discovery of an unidentified point-like very-high-energy (VHE) gamma-ray source around the PSR J1740+1000 named LHAASO J1740+0948.
Its significance is $12 \sigma$ ($5.4 \sigma$) above $25 \rm{TeV}$ ($100 \rm{TeV}$) and the best-fit position is $\rm{(R.A., decl)}=(265.01 \pm 0.03, 9.79 \pm 0.04)$. The energy spectrum can be described by a single power-law function with an index of $-3.15 \pm 0.17$. PSR J1740+1000 is a middle-aged (114 kyr) pulsar with a long X-ray tail. This means that TeV radiation may come from (1) high energy electrons escaping from the pulsar/PWN and scattering the interstellar radiation field, i.e, pulsar halo. But the TeV source and PSR J1740+1000 position offsets are difficult to interpret; (2) upscattering of CMB photons by the ultrarelativistic particles from the PWN tail. We speculate the particles were re-accelerated at the tail of the bow shock.