Large Binocular Telescope observations of PSR J2043+2740

Abstract

We present the results of deep optical imaging of the radio/$\gamma$-ray pulsar PSR J2043+2740, obtained with the Large Binocular Telescope (LBT). With a characteristic age of 1.2 Myr, PSR J2043+2740 is one of the oldest (non recycled) pulsars detected in $\gamma$-rays, although with still a quite high rotational energy reservoir (${\dot{E}}_{\mathrm{rot}}=5.6\times 10^{34}$ erg s${}^{-1}$). The presumably close distance (a few hundred pc), suggested by the hydrogen column density ($N_{\mathrm{H}}\lesssim 3.6\times 10^{20}$ cm${}^{-2}$), would make it a viable target for deep optical observations, never attempted until now. We observed the pulsar with the Large Binocular Camera of the LBT. The only object (V=25.44$\pm$0.05) detected within ~3" from the pulsar radio coordinates is unrelated to it. PSR J2043+2740 is, thus, undetected down to V~26.6 (3-$\sigma$), the deepest limit on its optical emission. We discuss the implications of this result on the pulsar emission properties.

arXiv comment4 pages, 3 figures, accepted for publication on MNRAS

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Cited by in corpus (2)

• Thermal luminosities of cooling neutron stars
• Observations of one young and three middle-aged $\gamma$-ray pulsars with the Gran Telescopio Canarias