<i>γ</i>-ray and <i>ν</i> Searches for Dark-Matter Subhalos in the Milky Way with a Baryonic Potential
The distribution of dark-matter (DM) subhalos in our galaxy remains disputed, leading to varying <inline-formula> <math display="inline"> <semantics> <mi>γ</mi> </semantics> </math> </inline-formula>-ray and <inline-formula> &l...
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| Format: | Article |
| Language: | English |
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MDPI AG
2019-05-01
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| Series: | Galaxies |
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| Online Access: | https://www.mdpi.com/2075-4434/7/2/60 |
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| author | Moritz Hütten Martin Stref Céline Combet Julien Lavalle David Maurin |
| author_facet | Moritz Hütten Martin Stref Céline Combet Julien Lavalle David Maurin |
| author_sort | Moritz Hütten |
| collection | DOAJ |
| description | The distribution of dark-matter (DM) subhalos in our galaxy remains disputed, leading to varying <inline-formula> <math display="inline"> <semantics> <mi>γ</mi> </semantics> </math> </inline-formula>-ray and <inline-formula> <math display="inline"> <semantics> <mi>ν</mi> </semantics> </math> </inline-formula> flux predictions from their annihilation or decay. In this work, we study how, in the inner galaxy, subhalo tidal disruption from the galactic baryonic potential impacts these signals. Based on state-of-the art modeling of this effect from numerical simulations and semi-analytical results, updated subhalo spatial distributions are derived and included in the CLUMPY code. The latter is used to produce a thousand realizations of the <inline-formula> <math display="inline"> <semantics> <mi>γ</mi> </semantics> </math> </inline-formula>-ray and <inline-formula> <math display="inline"> <semantics> <mi>ν</mi> </semantics> </math> </inline-formula> sky. Compared to predictions based on DM only, we conclude a decrease of the flux of the brightest subhalo by a factor of 2 to 7 for annihilating DM and no impact on decaying DM: the discovery prospects or limits subhalos can set on DM candidates are affected by the same factor. This study also provides probability density functions for the distance, mass, and angular distribution of the brightest subhalo, among which the mass may hint at its nature: it is most likely a dwarf spheroidal galaxy in the case of strong tidal effects from the baryonic potential, whereas it is lighter and possibly a dark halo for DM only or less pronounced tidal effects. |
| first_indexed | 2024-12-20T12:35:32Z |
| format | Article |
| id | doaj.art-f795f9a778c34401868b4c0e77fe3ec9 |
| institution | Directory Open Access Journal |
| issn | 2075-4434 |
| language | English |
| last_indexed | 2024-12-20T12:35:32Z |
| publishDate | 2019-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Galaxies |
| spelling | doaj.art-f795f9a778c34401868b4c0e77fe3ec92022-12-21T19:40:38ZengMDPI AGGalaxies2075-44342019-05-01726010.3390/galaxies7020060galaxies7020060<i>γ</i>-ray and <i>ν</i> Searches for Dark-Matter Subhalos in the Milky Way with a Baryonic PotentialMoritz Hütten0Martin Stref1Céline Combet2Julien Lavalle3David Maurin4Max-Planck-Institut für Physik, Föhringer Ring 6, D-80805 München, GermanyLaboratoire Univers & Particules de Montpellier (LUPM), CNRS & Université de Montpellier (UMR-5299), Place Eugène Bataillon, F-34095 Montpellier CEDEX 05, FranceLaboratoire de Physique Subatomique et de Cosmologie, Université Grenoble-Alpes, CNRS/IN2P3, 53 Avenue des Martyrs, 38026 Grenoble, FranceLaboratoire Univers & Particules de Montpellier (LUPM), CNRS & Université de Montpellier (UMR-5299), Place Eugène Bataillon, F-34095 Montpellier CEDEX 05, FranceLaboratoire de Physique Subatomique et de Cosmologie, Université Grenoble-Alpes, CNRS/IN2P3, 53 Avenue des Martyrs, 38026 Grenoble, FranceThe distribution of dark-matter (DM) subhalos in our galaxy remains disputed, leading to varying <inline-formula> <math display="inline"> <semantics> <mi>γ</mi> </semantics> </math> </inline-formula>-ray and <inline-formula> <math display="inline"> <semantics> <mi>ν</mi> </semantics> </math> </inline-formula> flux predictions from their annihilation or decay. In this work, we study how, in the inner galaxy, subhalo tidal disruption from the galactic baryonic potential impacts these signals. Based on state-of-the art modeling of this effect from numerical simulations and semi-analytical results, updated subhalo spatial distributions are derived and included in the CLUMPY code. The latter is used to produce a thousand realizations of the <inline-formula> <math display="inline"> <semantics> <mi>γ</mi> </semantics> </math> </inline-formula>-ray and <inline-formula> <math display="inline"> <semantics> <mi>ν</mi> </semantics> </math> </inline-formula> sky. Compared to predictions based on DM only, we conclude a decrease of the flux of the brightest subhalo by a factor of 2 to 7 for annihilating DM and no impact on decaying DM: the discovery prospects or limits subhalos can set on DM candidates are affected by the same factor. This study also provides probability density functions for the distance, mass, and angular distribution of the brightest subhalo, among which the mass may hint at its nature: it is most likely a dwarf spheroidal galaxy in the case of strong tidal effects from the baryonic potential, whereas it is lighter and possibly a dark halo for DM only or less pronounced tidal effects.https://www.mdpi.com/2075-4434/7/2/60dark mattergalactic subhalossemi-analytic modelinggamma-rays and neutrinos |
| spellingShingle | Moritz Hütten Martin Stref Céline Combet Julien Lavalle David Maurin <i>γ</i>-ray and <i>ν</i> Searches for Dark-Matter Subhalos in the Milky Way with a Baryonic Potential Galaxies dark matter galactic subhalos semi-analytic modeling gamma-rays and neutrinos |
| title | <i>γ</i>-ray and <i>ν</i> Searches for Dark-Matter Subhalos in the Milky Way with a Baryonic Potential |
| title_full | <i>γ</i>-ray and <i>ν</i> Searches for Dark-Matter Subhalos in the Milky Way with a Baryonic Potential |
| title_fullStr | <i>γ</i>-ray and <i>ν</i> Searches for Dark-Matter Subhalos in the Milky Way with a Baryonic Potential |
| title_full_unstemmed | <i>γ</i>-ray and <i>ν</i> Searches for Dark-Matter Subhalos in the Milky Way with a Baryonic Potential |
| title_short | <i>γ</i>-ray and <i>ν</i> Searches for Dark-Matter Subhalos in the Milky Way with a Baryonic Potential |
| title_sort | i γ i ray and i ν i searches for dark matter subhalos in the milky way with a baryonic potential |
| topic | dark matter galactic subhalos semi-analytic modeling gamma-rays and neutrinos |
| url | https://www.mdpi.com/2075-4434/7/2/60 |
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