Wang, H;
Eisenstein, DJ;
Aguilar, JN;
Ahlen, S;
Bailey, S;
Brooks, D;
Claybaugh, T;
... Zhou, Z; + view all
(2024)
Spectroscopic search for optical emission lines from dark matter decay.
Physical Review D
, 110
(10)
, Article 103007. 10.1103/PhysRevD.110.103007.
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Abstract
We search for narrow-line optical emission from dark matter decay by stacking dark-sky spectra from the Dark Energy Spectroscopic Instrument (DESI) at the redshift of nearby galaxies from DESI's Bright Galaxy and Luminous Red Galaxy samples. Our search uses regions separated by 5 to 20 arcsec from the centers of the galaxies, corresponding to an impact parameter of approximately 50 kpc. No unidentified spectral line shows up in the search, and we place a line flux limit of 10-19 ergs/s/cm2/arcsec2 on emissions in the wavelength range of 2000-9000A∘. This places the tightest constraints yet on the two-photon decay of dark matter in the mass range of 5 to 12 eV, with a particle lifetime exceeding 3×1025 s. This detection limit also implies that the line surface brightness contributed from all dark matter along the line of sight is at least 2 orders of magnitude lower than the measured extragalactic background light (EBL), ruling out the possibility that narrow optical-line emission from dark matter decay is a major source of the EBL.
| Type: | Article |
|---|---|
| Title: | Spectroscopic search for optical emission lines from dark matter decay |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevD.110.103007 |
| Publisher version: | https://doi.org/10.1103/physrevd.110.103007 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10202851 |
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