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Polarized image of a rotating black hole surrounded by a cold dark matter halo | Xin Qin
; Songbai Chen
; Zelin Zhang
; Jiliang Jing
; | Date: |
4 Jan 2023 | Abstract: | We have studied the polarized image of an equatorial emitting ring around a
rotating black hole surrounded by a cold dark matter (CDM) halo. Results show
that the CDM halo density has the similar effects of the halo’s characteristic
radius on the polarized image for the black hole. The effects of the CDM halo
on the polarized image depend on the magnetic field configuration, the fluid
velocity and the observed inclination. With the increase of the CDM halo
parameters, the observed polarization intensity decreases when the magnetic
field lies in equatorial plane, but in the case where the magnetic field is
perpendicular to the equatorial plane, the change of the observed polarization
intensity with CDM halo also depends on the position of the emitting point in
the ring. The change of the electric vector position angle (EVPA) with the CDM
halo becomes more complicated. Our results also show that the influence of the
CDM halo on the polarized image is generally small, which are consistent with
the effects of dark matter halo on black hole shadows. These results could help
to further understand dark matter from black hole images. | Source: | arXiv, 2301.01551 | Services: | Forum | Review | PDF | Favorites |
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