The Galactic bulge millisecond pulsars shining in X rays: A gamma-ray perspective. (arXiv:2012.03580v2 [astro-ph.HE] UPDATED)
<a href="http://arxiv.org/find/astro-ph/1/au:+Berteaud_J/0/1/0/all/0/1">Joanna Berteaud</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Calore_F/0/1/0/all/0/1">Francesca Calore</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Clavel_M/0/1/0/all/0/1">Maica Clavel</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Serpico_P/0/1/0/all/0/1">Pasquale Dario Serpico</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Dubus_G/0/1/0/all/0/1">Guillaume Dubus</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Petrucci_P/0/1/0/all/0/1">Pierre-Olivier Petrucci</a>

If the mysterious Fermi-LAT GeV gamma-ray excess is due to an unresolved
population of millisecond pulsars (MSP) in the Galactic bulge, one expects this
very same population to shine in X rays. For the first time, we address the
question of what is the sensitivity of current X-ray telescopes to an MSP
population in the Galactic bulge. To this end, we create a synthetic population
of Galactic MSPs, building on an empirical connection between gamma- and X-ray
MSP emission based on observed source properties. We compare our model with
compact sources in the latest Chandra source catalog, applying selections based
on spectral observables and optical astrometry with Gaia. We find a significant
number of Chandra sources in the region of interest to be consistent with being
bulge MSPs that are as yet unidentified. This motivates dedicated
multi-wavelength searches for bulge MSPs: Some promising directions are briefly
discussed.

If the mysterious Fermi-LAT GeV gamma-ray excess is due to an unresolved
population of millisecond pulsars (MSP) in the Galactic bulge, one expects this
very same population to shine in X rays. For the first time, we address the
question of what is the sensitivity of current X-ray telescopes to an MSP
population in the Galactic bulge. To this end, we create a synthetic population
of Galactic MSPs, building on an empirical connection between gamma- and X-ray
MSP emission based on observed source properties. We compare our model with
compact sources in the latest Chandra source catalog, applying selections based
on spectral observables and optical astrometry with Gaia. We find a significant
number of Chandra sources in the region of interest to be consistent with being
bulge MSPs that are as yet unidentified. This motivates dedicated
multi-wavelength searches for bulge MSPs: Some promising directions are briefly
discussed.

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