@Article{FortesMiraStecWuen:2020:WhCoOb,
               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 = "What could be the observational signature of dark matter in 
                         globular clusters?",
              journal = "Journal of Cosmology and Astroparticle Physics",
                 year = "2020",
               volume = "8",
                pages = "e010",
                month = "10.1088/1475-7516/2020/08/010",
             keywords = "astrophysical black holes, massive black holes, dark matter 
                         theory, particle physics - cosmology connection.",
             abstract = "Here we investigate the possibility that some globular clusters 
                         (GCs) harbor intermediate mass black holes (BH) in their centers 
                         and are also embedded in a low-mass dark matter (DM) halo. Up to 
                         date, there is no evidence on whether or not GCs have DM in their 
                         constitution. For standard cold DM cosmology, it is expected that 
                         GCs form with their own DM halos. Other studies investigate the 
                         possibility that GCs were initially embedded in massive DM halos 
                         that evolved during the cluster lifetime. An additional intriguing 
                         question is related to the existence of intermediate mass black 
                         holes (IMBH) in the GCs. The determination of whether GCs hold 
                         IMBHs would be able to answer important questions about GCs 
                         formation and the circumstances that gave rise to the IMBHs. DM 
                         \& IMBH in the context of GCs are interesting subjects to be 
                         studied and we will perform such studies here, assuming the 
                         coexistence of both of them in some GCs. Having such information, 
                         we perform the study possible DM signals from GCs. One important 
                         subject to be studied is the DM density profile. In the inner 
                         regions of GCs, the DM density profile is still an open question 
                         of fundamental importance to DM studies, specially for the study 
                         of radio and -y-ray emission from DM annihilation in such regions. 
                         Here we consider the case of IMBHs in the inner regions of three 
                         GCs: 47 Tuc, NGC 6266 and omega Cen. The existence of a black hole 
                         (BH) directly affects the matter distribution in its vicinity. 
                         These effects are significant for IMBHs as well as supermassive 
                         black holes (SMBHs) and can lead to large DM overdensities called 
                         spikes. In this paper, we direct our studies to the radio 
                         synchrotron emission from DM annihilation with spike profiles 
                         around possible IMBHs in GCs. We present our results for 
                         synchrotron emission produced by DM annihilation via b (b) over 
                         bar channel. We use the best-fit DM mass of 34 GeV and 
                         annihilation channel in b (b) over bar used to explain the 
                         Galactic center {"}excess{"} and perform our analysis for the 
                         estimated radio flux. We direct our attention specially to the 
                         gamma-ray emission from 47 Tuc. When considering a scenario wich 
                         includes a BH and the combined analysis of multi-wavelength 
                         studies, we conclude that some parameter choice as the 
                         annihilation cross section <sigma v > used to fit the gamma-ray 
                         excess differs by many orders of magnitude from the one necessary 
                         to fit the radio observations for this globular cluster if we 
                         consider the BH scenario.",
                  doi = "10.1088/1475-7516/2020/08/010",
                  url = "http://dx.doi.org/10.1088/1475-7516/2020/08/010",
                 issn = "1475-7516",
             language = "en",
           targetfile = "fortes_what.pdf",
        urlaccessdate = "28 abr. 2024"
}