Regular rotating black holes

Aida Kirichenko1,2

1Peter the Great Saint Petersburg Polytechnic University, Politekhnicheskaya 29, Saint Petersburg 195251, Russia; 2Ioffe Institute, Politekhnicheskaya 26, Saint Petersburg 194021, Russia

We present multiwavelength observations of four pulsars recently detected in the gamma-range with the Fermi orbital observatory: J1357-6429, J1048-5832, J0357+3205 and J2021+3651. Deep optical imaging of the last two with the 10m GTC telescope and reanalysis of Chandra and XMM-Newton archival X-ray data allowed us to put upper limits on their optical brightness and constrain their multiwavelength spectra in the optical and X-ray domains. The optical imaging obtained with the 8m VLT telescope revealed a point sourcewhich is considered as a candidate to the optical counterpart of the J1048-5832 pulsar wind nebula structure visible in X-rays. For the pulsar J1357-6429, a near infrared counterpart candidate was found in the high-spatial resolution imaging obtained with the VLT adaptive-optic system. Its brightness is consistent with the long wavelength extrapolation of the pulsar X-ray spectrum. The J1357-6429 proper motion, polarisation and spectrum were studied in the new radio-interferometric observations obtained with the ATCA interferometer in the 1-3 GHz band. We discuss the observational properties of all the pulsars and compare them with those for other pulsars detected in the respective ranges.

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