Characterization of subhalo structural properties and implications for dark matter annihilation signals

被引：136

作者：

Moline, Angeles ^{[1
,3
]}

Sanchez-Conde, Miguel A. ^{[2
]}

Palomares-Ruiz, Sergio ^{[3
]}

Prada, Francisco ^{[4
,5
,6
]}

机构：

[1] Univ Tecn Lisboa, CFTP, Inst Super Tecn, Av Rovisco Pais 1, P-1049001 Lisbon, Portugal

[2] Stockholm Univ, Dept Phys, Oskar Klein Ctr Cosmoparticle Phys, SE-10691 Stockholm, Sweden

[3] Univ Valencia, CSIC, Inst Fis Corpuscular IFIC, Apartado Correos 22085, E-46071 Valencia, Spain

[4] Campus Int Excellence UAM CSIC, E-28049 Madrid, Spain

[5] Univ Autonoma Madrid, CSIC, Inst Fis Teor, E-28049 Madrid, Spain

[6] CSIC, IAA, Glorieta Astron, E-18008 Granada, Spain

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2017年 / 466卷 / 04期

关键词：

galaxies: haloes; cosmology: theory; dark matter; DENSITY PROFILE; COSMOLOGICAL PARAMETERS; DYNAMICAL EVOLUTION; HALO CONCENTRATIONS; SATELLITE GALAXIES; DWARF GALAXIES; CLUSTER HALOES; MASS FUNCTIONS; IMPROVED MODEL; PHASE-SPACE;

D O I：

10.1093/mnras/stx026

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A prediction of the standard Lambda cold dark matter cosmology is that dark matter (DM) haloes are teeming with numerous self-bound substructure or subhaloes. The precise properties of these subhaloes represent important probes of the underlying cosmological model. We use data from Via Lactea II and Exploring the Local Volume in Simulations N-body simulations to learn about the structure of subhaloes with masses 10(6)-10(11) h(-1) M circle dot. Thanks to a superb subhalo statistics, we study subhalo properties as a function of distance to host halo centre and subhalo mass, and provide a set of fits that accurately describe the subhalo structure. We also investigate the role of subhaloes on the search for DM annihilation. Previous work has shown that subhaloes are expected to boost the DM signal of their host haloes significantly. Yet, these works traditionally assumed that subhaloes exhibit similar structural properties than those of field haloes, while it is known that subhaloes are more concentrated. Building upon our N-body data analysis, we refine the substructure boost model of Sanchez-Conde & Prada (2014), and find boosts that are a factor 2-3 higher. We further refine the model to include unavoidable tidal stripping effects on the subhalo population. For field haloes, this introduces a moderate (similar to 20-30 per cent) suppression. Yet, for subhaloes like those hosting dwarf galaxy satellites, tidal stripping plays a critical role, the boost being at the level of a few tens of percent at most. We provide a parametrization of the boost for field haloes that can be safely applied over a wide halo mass range.

引用

页码：4974 / 4990

页数：17

共 154 条

[1] Searching for Dark Matter Annihilation from Milky Way Dwarf Spheroidal Galaxies with Six Years of Fermi Large Area Telescope Data [J].

Ackermann, M. ;

Albert, A. ;

Anderson, B. ;

Atwood, W. B. ;

Baldini, L. ;

Barbiellini, G. ;

Bastieri, D. ;

Bechtol, K. ;

Bellazzini, R. ;

Bissaldi, E. ;

Blandford, R. D. ;

Bloom, E. D. ;

Bonino, R. ;

Bottacini, E. ;

Brandt, T. J. ;

Bregeon, J. ;

Bruel, P. ;

Buehler, R. ;

Caliandro, G. A. ;

Cameron, R. A. ;

Caputo, R. ;

Caragiulo, M. ;

Caraveo, P. A. ;

Cecchi, C. ;

Charles, E. ;

Chekhtman, A. ;

Chiang, J. ;

Chiaro, G. ;

Ciprini, S. ;

Claus, R. ;

Cohen-Tanugi, J. ;

Conrad, J. ;

Cuoco, A. ;

Cutini, S. ;

D'Ammando, F. ;

de Angelis, A. ;

de Palma, F. ;

Desiante, R. ;

Digel, S. W. ;

Di Venere, L. ;

Drell, P. S. ;

Drlica-Wagner, A. ;

Essig, R. ;

Favuzzi, C. ;

Fegan, S. J. ;

Ferrara, E. C. ;

Focke, W. B. ;

Franckowiak, A. ;

Fukazawa, Y. ;

Funk, S. .

PHYSICAL REVIEW LETTERS, 2015, 115 (23)

[2] SEARCH FOR DARK MATTER SATELLITES USING FERMI-LAT [J].

Ackermann, M. ;

Albert, A. ;

Baldini, L. ;

Ballet, J. ;

Barbiellini, G. ;

Bastieri, D. ;

Bechtol, K. ;

Bellazzini, R. ;

Blandford, R. D. ;

Bloom, E. D. ;

Bonamente, E. ;

Borgland, A. W. ;

Bottacini, E. ;

Brandt, T. J. ;

Bregeon, J. ;

Brigida, M. ;

Bruel, P. ;

Buehler, R. ;

Burnett, T. H. ;

Caliandro, G. A. ;

Cameron, R. A. ;

Caraveo, P. A. ;

Casandjian, J. M. ;

Cecchi, C. ;

Charles, E. ;

Chiang, J. ;

Ciprini, S. ;

Claus, R. ;

Cohen-Tanugi, J. ;

Conrad, J. ;

Cutini, S. ;

de Palma, F. ;

Dermer, C. D. ;

Digel, S. W. ;

do Couto e Silva, E. ;

Drell, P. S. ;

Drlica-Wagner, A. ;

Essig, R. ;

Falletti, L. ;

Favuzzi, C. ;

Fegan, S. J. ;

Focke, W. B. ;

Fukazawa, Y. ;

Funk, S. ;

Fusco, P. ;

Gargano, F. ;

Germani, S. ;

Giglietto, N. ;

Giordano, F. ;

Giroletti, M. .

ASTROPHYSICAL JOURNAL, 2012, 747 (02)

[3] Planck 2015 results XIII. Cosmological parameters [J].

Ade, P. A. R. ;

Aghanim, N. ;

Arnaud, M. ;

Ashdown, M. ;

Aumont, J. ;

Baccigalupi, C. ;

Banday, A. J. ;

Barreiro, R. B. ;

Bartlett, J. G. ;

Bartolo, N. ;

Battaner, E. ;

Battye, R. ;

Benabed, K. ;

Benoit, A. ;

Benoit-Levy, A. ;

Bernard, J. -P. ;

Bersanelli, M. ;

Bielewicz, P. ;

Bock, J. J. ;

Bonaldi, A. ;

Bonavera, L. ;

Bond, J. R. ;

Borrill, J. ;

Bouchet, F. R. ;

Boulanger, F. ;

Bucher, M. ;

Burigana, C. ;

Butler, R. C. ;

Calabrese, E. ;

Cardoso, J. -F. ;

Catalano, A. ;

Challinor, A. ;

Chamballu, A. ;

Chary, R. -R. ;

Chiang, H. C. ;

Chluba, J. ;

Christensen, P. R. ;

Church, S. ;

Clements, D. L. ;

Colombi, S. ;

Colombo, L. P. L. ;

Combet, C. ;

Coulais, A. ;

Crill, B. P. ;

Curto, A. ;

Cuttaia, F. ;

Danese, L. ;

Davies, R. D. ;

Davis, R. J. ;

de Bernardis, P. .

ASTRONOMY & ASTROPHYSICS, 2016, 594

[4] Gamma-ray constraints on neutralino dark matter clumps in the galactic halo [J].

Aloisio, R ;

Blasi, P ;

Olinto, AV .

ASTROPHYSICAL JOURNAL, 2004, 601 (01) :47-53

[5]

Anderhalden D., 2013, JCAP, V04, P009

[6]

[Anonymous], 2013, JCAP

[7] Detection of neutralino annihilation photons from external galaxies [J].

Baltz, EA ;

Briot, C ;

Salati, P ;

Taillet, R ;

Silk, J .

PHYSICAL REVIEW D, 2000, 61 (02)

[8] Can astrophysical gamma-ray sources mimic dark matter annihilation in galactic satellites? [J].

Baltz, Edward A. ;

Taylor, James E. ;

Wai, Lawrence L. .

ASTROPHYSICAL JOURNAL, 2007, 659 (02) :L125-L128

[9] Boosting the annihilation boost: Tidal effects on dark matter subhalos and consistent luminosity modeling [J].

Bartels, Richard ;

Ando, Shin'ichiro .

PHYSICAL REVIEW D, 2015, 92 (12)

[10] THE ROCKSTAR PHASE-SPACE TEMPORAL HALO FINDER AND THE VELOCITY OFFSETS OF CLUSTER CORES [J].

Behroozi, Peter S. ;

Wechsler, Risa H. ;

Wu, Hao-Yi .

ASTROPHYSICAL JOURNAL, 2013, 762 (02)

← 1 2 3 4 5 6 7 8 9 10 →