We present a multiband search for X-ray, optical, and γ -ray emission of the radio binary millisecond pulsar J1836-2354A, hosted in the globular cluster M22. X-ray emission is significantly detected in two Chandra observations, performed in 2005 and 2014, at a luminosity of ∼2-3 × 1030 erg s−1, in the 0.5-8 keV energy range. The radio and the X-ray source positions are found consistent within 1σ error box. No detection is found in archival XMM-Newton and Swift/XRT observations, compatible with the Chandra flux level. The low statistics prevents us to assess if the X-ray source varied between the two observations. The X-ray spectrum is consistent with a power-law of photon index ∼1.5. We favour as the most probable origin of the X-ray emission an intrabinary shock scenario. We searched for optical and γ -ray counterparts to the radio source using data from Hubble Space Telescope and Fermi-LAT catalogues, respectively. No optical counterpart down to V = 25.9 and I = 24.7 (3σ ) is detected, which suggests a companion mass of 0.1-0.2 M. Combined with the low X-ray luminosity, this is consistent with a black widow nature of PSR J1636-2354A. Inspecting the 8-year Fermi-LAT catalogue, we found a γ -ray source, 4FGL J1836.8-2354, with a positional uncertainty consistent with the globular cluster, but not with the radio position of the millisecond pulsar.

Amato R., D'Ai A., Del Santo M., De Martino D., Marino A., Di Salvo T., et al. (2019). Search for multiwavelength emission from the binary millisecond pulsar PSR J1836-2354A in the globular cluster M22. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 486(3), 3992-4000 [10.1093/mnras/stz1100].

Search for multiwavelength emission from the binary millisecond pulsar PSR J1836-2354A in the globular cluster M22

Amato R.
;
Marino A.;Di Salvo T.;Iaria R.;
2019-01-01

Abstract

We present a multiband search for X-ray, optical, and γ -ray emission of the radio binary millisecond pulsar J1836-2354A, hosted in the globular cluster M22. X-ray emission is significantly detected in two Chandra observations, performed in 2005 and 2014, at a luminosity of ∼2-3 × 1030 erg s−1, in the 0.5-8 keV energy range. The radio and the X-ray source positions are found consistent within 1σ error box. No detection is found in archival XMM-Newton and Swift/XRT observations, compatible with the Chandra flux level. The low statistics prevents us to assess if the X-ray source varied between the two observations. The X-ray spectrum is consistent with a power-law of photon index ∼1.5. We favour as the most probable origin of the X-ray emission an intrabinary shock scenario. We searched for optical and γ -ray counterparts to the radio source using data from Hubble Space Telescope and Fermi-LAT catalogues, respectively. No optical counterpart down to V = 25.9 and I = 24.7 (3σ ) is detected, which suggests a companion mass of 0.1-0.2 M. Combined with the low X-ray luminosity, this is consistent with a black widow nature of PSR J1636-2354A. Inspecting the 8-year Fermi-LAT catalogue, we found a γ -ray source, 4FGL J1836.8-2354, with a positional uncertainty consistent with the globular cluster, but not with the radio position of the millisecond pulsar.
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Amato R., D'Ai A., Del Santo M., De Martino D., Marino A., Di Salvo T., et al. (2019). Search for multiwavelength emission from the binary millisecond pulsar PSR J1836-2354A in the globular cluster M22. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 486(3), 3992-4000 [10.1093/mnras/stz1100].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10447/387768
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