2024PASJ...76..733H

Query : 2024PASJ...76..733H

2024PASJ...76..733H - Publ. Astron. Soc. Jap., 76, 733-752 (2024/August-0)

Final results of the search for new Milky Way satellites in the Hyper Suprime-Cam Subaru Strategic Program survey: Discovery of two more candidates.

HOMMA D., CHIBA M., KOMIYAMA Y., TANAKA M., OKAMOTO S., TANAKA M., ISHIGAKI M.N., HAYASHI K., ARIMOTO N., LUPTON R.H., STRAUSS M.A., MIYAZAKI S., WANG S.-Y. and MURAYAMA H.

Abstract (from CDS):

We present the final results of our search for new Milky Way (MW) satellites using the data from the Hyper Suprime-Cam (HSC) Subaru Strategic Program (SSP) survey over ∼1140 deg2. In addition to three candidates that we have already reported, we have identified two new MW satellite candidates in the constellations of Sextans, at a heliocentric distance of D⊙ ≃ 126 kpc, and Virgo, at D⊙ ≃ 151 kpc, named Sextans II and Virgo III, respectively. Their luminosities (Sext II: MV ≃ -3.9 mag; Vir III: MV ≃ -2.7 mag) and half-light radii (Sext II: rh ≃ 154 pc; Vir III: rh ≃ 44 pc) place them in the region of size-luminosity space of ultra-faint dwarf galaxies (UFDs). Including four previously known satellites, there are a total of nine satellites in the HSC-SSP footprint. This discovery rate of UFDs is much higher than that predicted from the recent models for the expected population of MW satellites in the framework of cold dark matter models, thereby suggesting that we encounter a too many satellites problem. Possible solutions to settle this tension are also discussed.

Abstract Copyright: © The Author(s) 2024. Published by Oxford University Press on behalf of the Astronomical Society of Japan.

Journal keyword(s): galaxies: dwarf - galaxies: individual (Sextans II, Virgo III) - Local Group

Simbad objects: 21

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Number of rows : 21
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 IC 1613 GiC 01 04 48.4071 +02 07 10.185   10.42 10.01 9.77   ~ 1316 2
2 NAME Whiting 1 GlC 02 02 56.8 -03 15 10           ~ 177 0
3 NAME Cetus III Dwarf Galaxy LSB 02 05 19.40 -04 16 12.0           ~ 32 0
4 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
5 Cl Pismis 2 OpC 08 17 54.4 -41 40 27           ~ 50 0
6 Z 36-12 H2G 10 00 00.8217342072 +05 20 09.533389560 12.77 12.25 11.89 11.71   ~ 569 0
7 NAME COSMOS Field reg 10 00 28.60 +02 12 21.0           ~ 3639 0
8 NAME Sextans C GlC 10 05 30.96 +00 04 15.4   15.5 13.9     ~ 354 1
9 NAME Sextans dSph LSB 10 13 02.9 -01 36 53   12 10.4     ~ 921 0
10 NAME Sextans II LSB 10 25 45 -00 37.9           ~ 5 0
11 NAME Leo V LSB 11 31 09.60 +02 13 12.0     16.0     ~ 234 0
12 NAME Leo IV LSB 11 32 57.0 -00 32 00     15.1     ~ 419 1
13 NAME Vir I Dwarf Galaxy LSB 12 00 09.6 -00 40 48           ~ 40 0
14 NAME Virgo III Dwarf Galaxy LSB 12 25 24 +04 27.0           ~ 6 0
15 NAME Virgo dSph G 12 28 15.4068 +12 33 37.152     20.99   19.82 ~ 23 0
16 Z 247-26 AG? 14 24 43.21 +44 31 41.8 14.24 13.54 13.17 13.07   ~ 217 0
17 NAME Bootes IV LSB 15 34 45 +43 43.6           ~ 24 0
18 NAME HSC 1 Cl* 22 17 14 +03 28.8           ~ 6 0
19 NAME Pegasus III LSB 22 24 22.6 +05 25 12           ~ 69 0
20 NAME Pisces II G 22 58 31.0 +05 57 09     16.3     ~ 283 0
21 NAME Local Group GrG ~ ~           ~ 9325 0

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