On the Gravitational Wave Counterpart to a Gamma-ray Galactic Center Signal from Millisecond Pulsars
arXiv:2409.12271 · doi:10.1103/PhysRevD.110.123036
Abstract
The new tools of gravitational wave and multi-messenger astronomy allow for the study of astrophysical phenomenon in new ways and enables light to be shed on some of the longest-enduring mysteries of high-energy astrophysics. Among the latter stands the Galactic center gamma-ray excess, associated with a source whose nature could be annihilating dark matter or a yet-unresolved population of millisecond pulsars (MSPs). MSPs are most likely asymmetric about their axis of rotation, and are thus thought to also source quasi-monochromatic gravitational waves, that dark matter processes would not emit. Using statistical methods, we simulate realistic MSP population samples with differing morphology and moment of inertia, that could give rise to the gamma-ray excess, and we compute the corresponding gravitational wave signal amplitude and frequency. We find that the gravitational wave signal frequency likely ranges between 200 and 1400 Hz, and that the collective dimensionless strain from the center of the Galaxy has an amplitude between and , thus most likely beyond current and near-term detectors, unless the unresolved MSPs are extraordinarily gamma-ray dim.
19 pages, 11 figures
References in corpus (13)
- GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral
- Sensitivity and Performance of the Advanced LIGO Detectors in the Third Observing Run
- Review of the Advanced LIGO gravitational wave observatories leading to observing run four
- Millisecond pulsar interpretation of the Galactic center gamma-ray excess
- Millisecond Pulsars from Accretion Induced Collapse as the Origin of the Galactic Centre Gamma-ray Excess Signal
- Les Houches Lectures on Indirect Detection of Dark Matter
- Comparing the Galactic Bulge and Galactic Disk Millisecond Pulsars
- Prospects for improving the sensitivity of the cryogenic gravitational wave detector KAGRA
- A strange star scenario for the formation of isolated millisecond pulsars
- 8 in 10 Stars in the Milky Way Bulge Experience Stellar Encounters Within 1000 AU in a Gigayear
- Probing the Fermi-LAT GeV excess with gravitational waves
- Probing the pulsar explanation of the Galactic-Center GeV excess using continuous gravitational-wave searches
- Constraining the ellipticity of millisecond pulsars with observed spin-down rates