2024ApJ...960...98Y

Query : 2024ApJ...960...98Y

2024ApJ...960...98Y - Astrophys. J., 960, 98 (2024/January-2)

Indirect Detection of Decaying Dark Matter with High Angular Resolution: The Case for Axion Search by IRCS on the Subaru Telescope.

YIN W. and HAYASHI K.

Abstract (from CDS):

Recent advances in photon detectors have provided exceptional sensitivities to dark matter with high angular resolution. Motivated by this, we present a detailed study of photon flux from dark matter decay in dwarf spheroidal galaxies (dSphs) by focusing on the detectors with arcsecond-level field of view and/or angular resolution. We propose to use differential D-factors since such detectors are sensitive to their dark matter distributions. We carefully estimate the differential D-factors of 35 dSphs. By using the differential D-factors, it turns out that the resulting signal flux can have a more than ${ \mathcal O }$(1-10) enhancement compared to conventional estimations. Based on this analysis, we find that the Infrared Camera and Spectrograph (IRCS) installed on the 8.2 m Subaru Telescope can be an excellent dark matter detector for the mass in the eV range, particularly axion-like particles (ALPs). Observing the Draco or Ursa Major II dSphs with the IRCS for ${ \mathcal O }(1)$ night will enable us to place the most stringent bound for the ALP dark matter in the mass range of 1 eV ≲ ma ≲ 2 eV.

Abstract Copyright: © 2024. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Cold dark matter - Dark matter distribution - Infrared spectroscopy

Simbad objects: 19

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Number of rows : 19
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 NAME Tuc IV G 00 02.9 -60 51           ~ 90 0
2 NAME Tri II G 02 13 17.40 +36 10 42.4           ~ 164 0
3 NAME Hor I G 02 55 31.7 -54 07 08           ~ 169 0
4 NAME Reticulum II G 03 35 42.1 -54 02 57           ~ 375 0
5 NAME Eridanus II G 03 44 21.1 -43 32 00           ~ 216 0
6 SN 1987A SN* 05 35 27.98840 -69 16 11.1134           SNIIpec 5203 2
7 NAME UMa II Galaxy G 08 51 30.0 +63 07 48     13.3     ~ 410 0
8 NAME Leo T G 09 34 53.4 +17 03 05     15.1     ~ 434 0
9 NAME Antlia II Dwarf Galaxy G 09 35 32.8 -36 46 02           ~ 109 0
10 NAME Crater II Dwarf Galaxy G 11 49 14 -18 24.8           ~ 176 0
11 NAME Hydra II G 12 21 42.1 -31 59 07           ~ 118 0
12 NAME Draco II Gl? 15 52 47.6 +64 33 55           ~ 138 0
13 Z 300-12 G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1428 1
14 ACO 2390 ClG 21 53 37.4 +17 41 46           ~ 732 2
15 NAME Gru II G 22 04.1 -46 26           ~ 110 0
16 NAME Tuc II G 22 51 55.1 -58 34 08           ~ 192 0
17 NAME Grus I G 22 56 42.4 -50 09 48           ~ 126 0
18 ACO 2667 ClG 23 51 39.37 -26 05 02.7           ~ 190 0
19 NAME Tuc III G 23 56.6 -59 36           ~ 229 0

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