@Article{FortesMiraStecWuen:2021:DaMaAn,
author = "Fortes, Elaine C. F. S. and Miranda, Oswaldo Duarte and Stecker,
Floyd W. and Wuensche, Carlos Alexandre",
affiliation = "{Universidade Federal do Pampa (UNIPAMPA)} and {Instituto Nacional
de Pesquisas Espaciais (INPE)} and {NASA Goddard Space Flight
Center} and {Instituto Nacional de Pesquisas Espaciais (INPE)}",
title = "Dark matter annihilation in the most luminous and the most massive
ultra-compact dwarf galaxies (UCD)",
journal = "Journal of Cosmology and Astroparticle Physics",
year = "2021",
volume = "3",
pages = "e003",
month = "Mar.",
keywords = "dark matter simulations, dark matter theory, dwarfs galaxies,
massive black holes.",
abstract = "In this paper, we explore the potential astrophysical signatures
of dark matter (DM) annihilations in ultra-compact dwarf galaxies
(UCDs) considering two of the richest known galaxy clusters within
100 million light-years, nominally, Virgo and Fornax. Fornax UCD3
is the most luminous known UCD and M59 UCD3 is the most massive
known UCD. With the detection of a 3.5 million solar mass black
hole (BH) in Fornax UCD3, we carefully model several dark matter
(DM) enhanced profile scenarios, considering the presence of both
a supermassive black hole (SMBH) and DM. For Fornax UCD3, the
comparison of the stellar and dynamical masses suggests that there
is little content of DM in UCDs. M59 UCD3 did not receive the same
attention in simulations as Fornax UCD3, however deep radio
imaging and X-ray observations were performed for M59 UCD3 and can
be used to place limits in DM content of these UCDs. We take an
average estimate of dark matter content and used the Salpeter and
Kroupa mass functions. We model Fornax UCD3 and M59 UCD3 to have a
DM content that is the average of these mass functions. We then
analyze the constraints for Fornax and M59 UCD3 coming from
gamma-ray and radio sources, considering a dark matter particle
with a mass between 10 and 34 GeV in our simulations. In the
absence of a strong gamma-ray signature, we show that the
synchrotron emission from electrons and positrons produced by DM
annihilations can be very sensitive to indirect DM search. We find
that DM parameters can be significantly constrained at radio
frequencies and that the spike profiles play an interesting role
in the deep study of the enhancements of DM \& BH interactions in
ultra-compact galaxies.",
doi = "10.1088/1475-7516/2021/03/003",
url = "http://dx.doi.org/10.1088/1475-7516/2021/03/003",
issn = "1475-7516",
language = "en",
targetfile = "fortes_dark.pdf",
urlaccessdate = "23 maio 2024"
}