2016ApJ...828L...5C

Query : 2016ApJ...828L...5C

2016ApJ...828L...5C - Astrophys. J., 828, L5-L5 (2016/September-1)

First results from the MADCASH survey: a faint dwarf galaxy companion to the low-mass spiral galaxy NGC 2403 at 3.2 Mpc.

CARLIN J.L., SAND D.J., PRICE P., WILLMAN B., KARUNAKARAN A., SPEKKENS K., BELL E.F., BRODIE J.P., CRNOJEVIC D., FORBES D.A., HARGIS J., KIRBY E., LUPTON R., PETER A.H.G., ROMANOWSKY A.J. and STRADER J.

Abstract (from CDS):

We report the discovery of the faintest known dwarf galaxy satellite of a Large Magellanic Cloud (LMC) stellar-mass host beyond the Local Group (LG), based on deep imaging with Subaru/Hyper Suprime-Cam. Magellanic Analog Dwarf Companions And Stellar Halos (MADCASH) J074238+652501-dw lies ∼35 kpc in projection from NGC 2403, a dwarf spiral galaxy at D ≃ 3.2 Mpc. This new dwarf has {M}_{g}=-7.4±0.4 and a half-light radius of 168±70 pc, at the calculated distance of 3.39±0.41 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 LG. The lack of either detected HI gas ({M}HI/L{V}\lt 0.69 {M}_☉/L_☉, 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 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 ∼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.

Abstract Copyright: © 2016. The American Astronomical Society. All rights reserved.

Journal keyword(s): dark matter - galaxies: dwarf - galaxies: formation - galaxies: halos - galaxies: halos

Nomenclature: Table 1: MADCASH JHHMMSS+DDMMSS-dw N=1 = [CSP2016] MADCASH J074238+652501-dw N=1.

Simbad objects: 22

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Number of rows : 22
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 NGC 55 GiG 00 14 53.602 -39 11 47.86 8.54 8.58 7.87 7.84   ~ 778 2
2 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 12645 1
3 NGC 247 LSB 00 47 08.554 -20 45 37.44 10.11 9.61 9.10 8.87   ~ 441 2
4 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 3336 2
5 NGC 300 GiG 00 54 53.4465638304 -37 41 03.168402396 8.83 8.69 8.13 7.46   ~ 1502 2
6 NGC 404 LIN 01 09 27.02 +35 43 05.3   12.56 11.73     ~ 473 0
7 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 17431 0
8 NGC 2366 H2G 07 28 52.4529 +69 12 38.859 12.25 11.86 11.39 11.33   ~ 769 0
9 UGCA 133 G 07 34 11.5 +66 52 47 16.40 15.48 14.80 14.76   ~ 84 0
10 NGC 2403 AGN 07 36 51.3381434280 +65 36 09.650825640 9.31 8.84 8.38 8.19   ~ 1789 1
11 MADCASH-1 G 07 42 39.400 +65 25 00.01         23.55 ~ 13 0
12 UGC 4305 IG 08 19 04.9864630512 +70 43 13.086910452 12.06 11.72 11.39 11.11   ~ 769 2
13 NAME M 81 Dwarf A G 08 23 55.1 +71 01 56   16.5       ~ 203 1
14 UGC 4483 GiG 08 37 03.00 +69 46 31.0 15.70 15.46 14.98 14.89   ~ 303 0
15 NAME Leo T G 09 34 53.4 +17 03 05     15.1     ~ 391 0
16 NAME Antlia B G 09 48 56.08 -25 59 24.0           ~ 28 0
17 M 81 Sy2 09 55 33.1726556496 +69 03 55.062505368   7.89 6.94     ~ 4449 3
18 NAME NGC 3109 Group GrG 09 59 35.2 -12 49 52           ~ 38 0
19 NGC 3109 AG? 10 03 06.877 -26 09 34.46 11.10 10.42 10.04 9.91   ~ 769 2
20 NGC 4228 SBG 12 15 39.174 +36 19 36.80 10.63 10.30 9.93 9.74   ~ 965 1
21 NAME Centaurus A Sy2 13 25 27.61521044 -43 01 08.8050291   8.18 6.84 6.66   ~ 4484 3
22 NAME Local Group GrG ~ ~           ~ 8389 0

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