2022
DOI: 10.48550/arxiv.2207.02229
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The Tucana dwarf spheroidal: a distant backsplash galaxy of M31?

Abstract: We use the APOSTLE suite of Local Group (LG) cosmological hydrodynamical simulations to examine the properties of "backsplash" galaxies, i.e, dwarfs outside the virial radius, r 200 , of the Milky Way (MW) or M31 which may have been within their virial boundaries in the past. More than half of all dwarfs at distances between one and two virial radii of each primary are backsplash galaxies. More distant backsplash systems, i.e., those that reach distances well beyond 2 r 200 , are typically systems close to apo… Show more

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“…The right panel of Figure 6 shows the implications of the measured SBF distance for Blobby's local environment. The uncertainties on the distances to both Blobby and M81 suggest that Blobby is likely between 1 − 2.7𝑅 𝑣𝑖𝑟 with a central measured value of approximately 590 kpc from M81 (compared to the M81-M82 system virial radius of 𝑅 𝑣𝑖𝑟 ∼ 353 kpc), meaning Blobby lies in a region where simulations predict that the abundance of backsplash galaxies around similar mass hosts is roughly 50% (Gill et al 2005;Garrison-Kimmel et al 2014;Simpson et al 2018;Buck et al 2019;Haggar et al 2020;Applebaum et al 2021;Bakels et al 2021;Santos-Santos et al 2022).…”
Section: Resultsmentioning
confidence: 97%
“…The right panel of Figure 6 shows the implications of the measured SBF distance for Blobby's local environment. The uncertainties on the distances to both Blobby and M81 suggest that Blobby is likely between 1 − 2.7𝑅 𝑣𝑖𝑟 with a central measured value of approximately 590 kpc from M81 (compared to the M81-M82 system virial radius of 𝑅 𝑣𝑖𝑟 ∼ 353 kpc), meaning Blobby lies in a region where simulations predict that the abundance of backsplash galaxies around similar mass hosts is roughly 50% (Gill et al 2005;Garrison-Kimmel et al 2014;Simpson et al 2018;Buck et al 2019;Haggar et al 2020;Applebaum et al 2021;Bakels et al 2021;Santos-Santos et al 2022).…”
Section: Resultsmentioning
confidence: 97%