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23 April 2024 |
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The imprint of dark subhaloes on the circumgalactic medium | | Ian G. McCarthy
; Andreea S. Font
; | | Date: |
11 Jun 2020 | | Abstract: | The standard model of cosmology, the LCDM model, robustly predicts the
existence of a multitude of dark matter ’subhaloes’ around galaxies like the
Milky Way. A wide variety of observations have been proposed to look for the
gravitational effects such subhaloes would induce in observable matter. Most of
these approaches pertain to the stellar or cool gaseous phases of matter. Here
we propose a new approach, which is to search for the perturbations that such
dark subhaloes would source in the warm/hot circumgalactic medium (CGM) around
normal galaxies. With a combination of analytic theory, carefully-controlled
high-resolution idealised simulations, and full cosmological hydrodynamical
simulations, we calculate the expected signal and how it depends on important
physical parameters (subhalo mass, CGM temperature, and relative velocity). We
find that dark subhaloes enhance the local CGM pressure, density, and
temperature, in order of decreasing magnitude of the effect. For the pressure,
the fluctuations can vary in magnitude from tens of percent (for subhaloes with
M_sub=10^10 Msun) to a few percent (for subhaloes with M_sub=10^8 Msun),
although this depends strongly on the CGM temperature. The subhaloes also
induce fluctuations in the velocity field ranging in magnitude from a few km/s
up to 25 km/s. We propose that X-ray, Sunyaev-Zel’dovich effect, radio
dispersion measure, and quasar absorption line observations can be used to
measure these fluctuations and place constraints on the abundance and
distribution of dark subhaloes, thereby placing constraints on the nature of
dark matter. | | Source: | arXiv, 2006.6741 | | Services: | Forum | Review | PDF | Favorites | |
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