New constraints on light axion-like particles using Chandra transmission grating spectroscopy of the powerful cluster-hosted quasar H1821+643

Autor: Matthews, James H, Reynolds, Christopher S, Russell, Helen R, Smith, Robyn N, Marsh, M. C.David
Jazyk: angličtina
Rok vydání: 2022
Předmět:
ISSN: 0035-8711
1365-2966
Popis: Axion-like particles (ALPs) are predicted by several Beyond the Standard Model theories, in particular, string theory. In the presence of an external magnetic field perpendicular to the direction of propagation, ALPs can couple to photons. Therefore, if an X-ray source is viewed through a magnetized plasma, such as a luminous quasar in a galaxy cluster, we may expect spectral distortions that are well described by photon–ALP oscillations. We present a 571 ks combined high- and low-energy transmission grating Chandra observation of the powerful radio-quiet quasar H1821+643, hosted by a cool-core cluster at redshift 0.3. The spectrum is well described by a double power-law continuum and broad+narrow iron line emission typical of type-1 active galactic nuclei (AGNs), with remaining spectral features 6.3 × 10−13 GeV−1 for most ALP masses
Databáze: OpenAIRE