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19 April 2024 |
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Article overview
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Two Local Volume Dwarf Galaxies Discovered in 21 cm Emission: Pisces A and B | | Erik J. Tollerud
; Marla C. Geha
; Jana Grcevich
; Mary E. Putman
; Daniel Stern
; | | Date: |
18 Nov 2014 | | Abstract: | We report the discovery of two dwarf galaxies, Pisces A and B, from a blind
21 cm HI search. These were the only two galaxies found via optical imaging and
spectroscopy of 22 HI clouds identified in the GALFA-HI survey as dwarf galaxy
candidates. They have properties consistent with being in the Local Volume
($<10$ Mpc), and one has resolved stellar populations such that it may be on
the outer edge of the Local Group ($sim 1 , {
m Mpc}$ from M31). While the
distance uncertainty makes interpretation ambiguous, these may be among the
faintest starforming galaxies known. Additionally, rough estimates comparing
these galaxies to $Lambda$CDM dark matter simulations suggest consistency in
number density, implying that dark matter halos likely to host these galaxies
are primarily HI-rich. The galaxies may thus be indicative of a large
population of dwarfs at the limit of detectability that are comparable to the
faint satellites of the Local Group. Because they are outside the influence of
a large dark matter halo to alter their evolution, these galaxies can provide
critical anchors to dwarf galaxy formation models. | | Source: | arXiv, 1411.5019 | | Services: | Forum | Review | PDF | Favorites | |
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