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18 April 2024 |
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First results from the MADCASH Survey: A Faint Dwarf Galaxy Companion to the Low Mass Spiral Galaxy NGC 2403 at 3.2 Mpc | | Jeffrey L. Carlin
; David J. Sand
; Paul Price
; Beth Willman
; Ananthan Karunakaran
; Kristine Spekkens
; Eric F. Bell
; Jean P. Brodie
; Denija Crnojević
; Duncan A. Forbes
; Jonathan Hargis
; Evan Kirby
; Robert Lupton
; Annika H. G. Peter
; Aaron J. Romanowsky
; Jay Strader
; | | Date: |
8 Aug 2016 | | Abstract: | We report the discovery of the faintest known dwarf galaxy satellite of an
LMC stellar-mass host beyond the Local Group, based on deep imaging with
Subaru/Hyper Suprime-Cam. MADCASH J074238+652501-dw lies $sim$35 kpc in
projection from NGC 2403, a dwarf spiral galaxy at $D$$approx$3.2 Mpc. This
new dwarf has $M_{g} = -7.4pm0.4$ and a half-light radius of $168pm70$ pc, at
the calculated distance of $3.39pm0.41$ Mpc. The color-magnitude diagram
reveals no evidence of young stellar populations, suggesting that MADCASH
J074238+652501-dw is an old, metal-poor dwarf similar to low luminosity dwarfs
in the Local Group. The lack of either detected HI gas ($M_{
m HI}/L_{V} <
0.69 M_odot/L_odot$, based on Green Bank Telescope observations) or $GALEX$
NUV/FUV flux enhancement is consistent with a lack of young stars. This is the
first result from the MADCASH (Magellanic Analog Dwarf Companions And Stellar
Halos) survey, which is conducting a census of the stellar substructure and
faint satellites in the halos of Local Volume LMC analogs via resolved stellar
populations. Models predict a total of $sim$4-10 satellites at least as
massive as MADCASH J074238+652501-dw around a host with the mass of NGC 2403,
with 2-3 within our field of view, slightly more than the one such satellite
observed in our footprint. | | Source: | arXiv, 1608.2591 | | Services: | Forum | Review | PDF | Favorites | |
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