TY  - JOUR
A1  - Damle, Mitali
A1  - Sparre, Martin
A1  - Richter, Philipp
A1  - Hani, Maan H.
A1  - Nuza, Sebastian
A1  - Pfrommer, Christoph
A1  - Grand, Robert J. J.
A1  - Hoffman, Yehuda
A1  - Libeskind, Noam
A1  - Sorce, Jenny
A1  - Steinmetz, Mathias
A1  - Tempel, Elmo
A1  - Vogelsberger, Mark
A1  - Wang, Peng
T1  - Cold and hot gas distribution around the Milky-Way – M31 system in the HESTIA simulations
JF  - Monthly notices of the royal astronomical society
N2  - Recent observations have revealed remarkable insights into the gas reservoir in the circumgalactic medium (CGM) of galaxy haloes. In this paper, we characterise the gas in the vicinity of Milky Way and Andromeda analogues in the hestia (High resolution Environmental Simulations of The Immediate Area) suite of constrained Local Group (LG) simulations. The hestia suite comprise of a set of three high-resolution arepo-based simulations of the LG, run using the Auriga galaxy formation model.
For this paper, we focus only on the 𝑧 = 0 simulation datasets and generate mock skymaps along with a power spectrum analysis to show that the distributions of ions tracing low-temperature gas (H i and Si iii) are more clumpy in comparison to warmer gas tracers (O vi, O vii and O viii). We compare to the spectroscopic CGM observations of M31 and low-redshift galaxies.
hestia under-produces the column densities of the M31 observations, but the simulations are consistent with the observations of low-redshift galaxies. A possible explanation for these findings is that the spectroscopic observations of M31 are contaminated by gas residing in the CGM of the Milky Way.
KW  - software: data analysis
KW  - software: simulations
KW  - Galaxy: evolution
KW  - galaxies: evolution
KW  - galaxies: Local Group
Y1  - 2022
U6  - https://doi.org/10.1093/mnras/stac663
SN  - 0035-8711
SN  - 1365-2966
VL  - 512
SP  - 3717
EP  - 3737
PB  - Oxford Univ. Press
CY  - Oxford
ER  -