@article{BaushevBarkov2018,
  author    = {Baushev, Anton N. and Barkov, M. V.},
  title     = {Why does Einasto profile index n similar to 6 occur so frequently?},
  series = {Journal of cosmology and astroparticle physics},
  journal   = {Journal of cosmology and astroparticle physics},
  number    = {3},
  publisher = {IOP Publ. Ltd.},
  address   = {Bristol},
  issn      = {1475-7516},
  doi       = {10.1088/1475-7516/2018/03/034},
  pages     = {15},
  year      = {2018},
  abstract  = {We consider the behavior of spherically symmetric Einasto halos composed of gravitating particles in the Fokker-Planck approximation. This approach allows us to consider the undesirable influence of close encounters in the N-body simulations more adequately than the generally accepted criteria. The Einasto profile with index n approximate to 6 is a stationary solution of the Fokker-Planck equation in the halo center. There are some reasons to believe that the solution is an attractor. Then the Fokker-Planck diffusion tends to transform a density profile to the equilibrium one with the Einasto index n approximate to 6. We suggest this effect as a possible reason why the Einasto index n approximate to 6 occurs so frequently in the interpretation of N-body simulation results. The results obtained cast doubt on generally accepted criteria of N-body simulation convergence.},
  language  = {en}
}
@article{Baushev2013,
  author    = {Baushev, Anton N.},
  title     = {Extragalactic dark matter and direct detection experiments},
  series = {The astrophysical journal : an international review of spectroscopy and astronomical physics},
  volume    = {771},
  journal   = {The astrophysical journal : an international review of spectroscopy and astronomical physics},
  number    = {2},
  publisher = {IOP Publ. Ltd.},
  address   = {Bristol},
  issn      = {0004-637X},
  doi       = {10.1088/0004-637X/771/2/117},
  pages     = {7},
  year      = {2013},
  abstract  = {Recent astronomical data strongly suggest that a significant part of the dark matter content of the Local Group and Virgo Supercluster is not incorporated into the galaxy halos and forms diffuse components of these galaxy clusters. A portion of the particles from these components may penetrate the Milky Way and make an extragalactic contribution to the total dark matter containment of our Galaxy. We find that the particles of the diffuse component of the Local Group are apt to contribute similar to 12\% to the total dark matter density near Earth. The particles of the extragalactic dark matter stand out because of their high speed (similar to 600 km s(-1)), i.e., they are much faster than the galactic dark matter. In addition, their speed distribution is very narrow (similar to 20 km s(-1)). The particles have an isotropic velocity distribution (perhaps, in contrast to the galactic dark matter). The extragalactic dark matter should provide a significant contribution to the direct detection signal. If the detector is sensitive only to the fast particles (v > 450 km s(-1)), then the signal may even dominate. The density of other possible types of the extragalactic dark matter (for instance, of the diffuse component of the Virgo Supercluster) should be relatively small and comparable with the average dark matter density of the universe. However, these particles can generate anomaly high-energy collisions in direct dark matter detectors.},
  language  = {en}
}
@article{Baushev2012,
  author    = {Baushev, Anton N.},
  title     = {Interaction of clumpy dark matter with interstellar medium in astrophysical systems},
  series = {Monthly notices of the Royal Astronomical Society},
  volume    = {420},
  journal   = {Monthly notices of the Royal Astronomical Society},
  number    = {1},
  publisher = {Wiley-Blackwell},
  address   = {Malden},
  issn      = {0035-8711},
  doi       = {10.1111/j.1365-2966.2011.20067.x},
  pages     = {590 -- 595},
  year      = {2012},
  abstract  = {Contemporary cosmological conceptions suggest that the dark matter in haloes of galaxies and galaxy clusters has most likely a clumpy structure. If a stream of gas penetrates through it, a small-scale gravitational field created by the clumps disturbs the flow resulting in momentum exchange between the stream and the dark matter. In this article, we perform an analysis of this effect, based on the hierarchical halo model of the dark matter structure and Navarro-Frenk-White density profiles. We consider the clumps of various masses, from the smallest up to the highest ones M = 10(9) M circle dot. It has been found that in any event the effect grows with the mass of the clump: not only the drag force F acting on the clump but also its acceleration w = F/M increases. We discuss various astrophysical systems. The mechanism proved to be ineffective in the case of galaxy or galaxy cluster collisions. On the other hand, it played an important role during the process of galaxy formation. As a result, the dark matter should have formed a more compact, oblate and faster rotating substructure in the halo of our Galaxy. We have shown that this thick disc should be more clumpy than the halo. This fact is very important for the indirect detection experiments since it is the clumps that give the main contribution to the annihilation signal. Our calculations show that the mechanism of momentum exchange between the dark and baryon matter is ineffective on the outskirts of the galactic halo. It means that the clumps from there were not transported to the thick disc, and this region should be more clumpy than the halo on the average.},
  language  = {en}
}
@article{Baushev2014,
  author    = {Baushev, Anton N.},
  title     = {Relaxation of dark matter halos: how to match observational data?},
  series = {Astronomy and astrophysics : an international weekly journal},
  volume    = {569},
  journal   = {Astronomy and astrophysics : an international weekly journal},
  publisher = {EDP Sciences},
  address   = {Les Ulis},
  issn      = {0004-6361},
  doi       = {10.1051/0004-6361/201322730},
  pages     = {8},
  year      = {2014},
  abstract  = {We show that moderate energy relaxation in the formation of dark matter halos invariably leads to profiles that match those observed in the central regions of galaxies. The density profile of the central region is universal and insensitive to either the seed perturbation shape or the details of the relaxation process. The profile has a central core; the multiplication of the central density by the core radius is almost independent of the halo mass, in accordance with observations. In the core area the density distribution behaves as an Einasto profile with low index (n similar to 0.5); it has an extensive region with rho proportional to r(-2) at larger distances. This is exactly the shape that observations suggest for the central region of galaxies. On the other hand, this shape does not fit the galaxy cluster profiles. A possible explanation of this fact is that the relaxation is violent in the case of galaxy clusters; however, it is not violent enough when galaxies or smaller dark matter structures are considered. We discuss the reasons for this.},
  language  = {en}
}
@article{BaushevFedericiPohl2012,
  author    = {Baushev, Anton N. and Federici, S. and Pohl, M.},
  title     = {Spectral analysis of the gamma-ray background near the dwarf MilkyWay satellite Segue 1: Improved limits on the cross section of neutralino dark matter annihilation},
  series = {Physical review : D, Particles, fields, gravitation, and cosmology},
  volume    = {86},
  journal   = {Physical review : D, Particles, fields, gravitation, and cosmology},
  number    = {6},
  publisher = {American Physical Society},
  address   = {College Park},
  issn      = {1550-7998},
  doi       = {10.1103/PhysRevD.86.063521},
  pages     = {7},
  year      = {2012},
  abstract  = {The indirect detection of dark matter requires that dark matter annihilation products be discriminated from conventional astrophysical backgrounds. Here, we re-analyze GeV-band gamma-ray observations of the prominent Milky Way dwarf satellite galaxy Segue 1, for which the expected astrophysical background is minimal. We explicitly account for the angular extent of the conservatively expected gamma-ray signal and keep the uncertainty in the dark-matter profile external to the likelihood analysis of the gamma-ray data.},
  language  = {en}
}
@article{Baushev2011,
  author    = {Baushev, Anton N.},
  title     = {Principal properties of the velocity distribution of dark matter particles on the outskirts of the Solar system},
  series = {Monthly notices of the Royal Astronomical Society},
  volume    = {417},
  journal   = {Monthly notices of the Royal Astronomical Society},
  number    = {1},
  publisher = {Wiley-Blackwell},
  address   = {Malden},
  issn      = {0035-8711},
  doi       = {10.1111/j.1745-3933.2011.01125.x},
  pages     = {L83 -- L87},
  year      = {2011},
  abstract  = {The velocity distribution of the dark matter particles on the outskirts of the Solar system remains unclear. We suggest to determine it using experimentally found properties of the oldest halo objects. Indeed, the oldest halo stars and globular clusters form a collisionless system, as well as dark matter particles do, and they evolved in the same gravitational field. If we accept this analogy, we can show that the velocity distribution of the dark matter particles should be highly anisotropic and have a sharp maximum near upsilon similar to 500 km s(-1). The distribution is totally different from the Maxwell one. We analyse the influence of the distribution function on the results of dark matter detection experiments. It is found that the direct detection signal should differ noticeably from the one calculated from the Maxwell distribution with <upsilon > similar or equal to 220 km s(-1), which is conventional for direct detection experiments (the ratio depends on the detector properties and typically falls within the range between 6 and 0.2). Moreover, the sharp distinction from the Maxwell distribution can be very essential to the observations of dark matter annihilation.},
  language  = {en}
}
@article{Baushev2014,
  author    = {Baushev, Anton N.},
  title     = {Galaxy halo formation in the absence of violent relaxation and a universal density profile of the halo center},
  series = {The astrophysical journal : an international review of spectroscopy and astronomical physics},
  volume    = {786},
  journal   = {The astrophysical journal : an international review of spectroscopy and astronomical physics},
  number    = {1},
  publisher = {IOP Publ. Ltd.},
  address   = {Bristol},
  issn      = {0004-637X},
  doi       = {10.1088/0004-637X/786/1/65},
  pages     = {8},
  year      = {2014},
  abstract  = {While N-body simulations testify to a cuspy profile of the central region of dark matter halos, observations favor a shallow, cored density profile of the central region of at least some spiral galaxies and dwarf spheroidals. We show that a central profile, very close to the observed one, inevitably forms in the center of dark matter halos if we make a supposition about a moderate energy relaxation of the system during the halo formation. If we assume the energy exchange between dark matter particles during the halo collapse is not too intensive, the profile is universal: it depends almost not at all on the properties of the initial perturbation and is very akin, but not identical, to the Einasto profile with a small Einasto index n similar to 0.5. We estimate the size of the "central core" of the distribution, i.e., the extent of the very central region with a respectively gentle profile, and show that the cusp formation is unlikely, even if the dark matter is cold. The obtained profile is in good agreement with observational data for at least some types of galaxies but clearly disagrees with N-body simulations.},
  language  = {en}
}
@article{Baushev2016,
  author    = {Baushev, Anton N.},
  title     = {Can the dark matter annihilation signal be significantly boosted by substructures?},
  series = {Journal of cosmology and astroparticle physics},
  volume    = {30},
  journal   = {Journal of cosmology and astroparticle physics},
  publisher = {IOP Publ. Ltd.},
  address   = {Bristol},
  issn      = {1475-7516},
  doi       = {10.1088/1475-7516/2016/01/018},
  pages     = {12 -- 18},
  year      = {2016},
  abstract  = {A very general cosmological consideration suggests that, along with galactic dark matter halos, much smaller dark matter structures may exist. These structures are usually called `clumps', and their mass extends to 10\&\#8722;6 M \&\#8857; or even lower. The clumps should give the main contribution into the signal of dark matter annihilation, provided that they have survived until the present time. Recent observations favor a cored profile for low-mass astrophysical halos. We consider cored clumps and show that they are significantly less firm than the standard NFW ones. In contrast to the standard scenario, the cored clumps should have been completely destroyed inside ~ 20 kpc from the Milky Way center. The dwarf spheroidals should not contain any dark matter clumps. On the other hand, even under the most pessimistic assumption about the clump structure, the clumps should have survived in the Milky Way at a distance exceeding 50 kpc from the center, as well as in low-density cosmic structures. There they significantly boost the dark matter annihilation. We show that at least 70\% of the clumps endured the primordial structure formation should still exist untouched in the present-day Universe.},
  language  = {en}
}
@article{Baushev2015,
  author    = {Baushev, Anton N.},
  title     = {The real and apparent convergence of N-body simulations of the dark matter structures: Is the Navarro-Frenk-White profile real?},
  series = {Astroparticle physics},
  volume    = {62},
  journal   = {Astroparticle physics},
  publisher = {Elsevier},
  address   = {Amsterdam},
  issn      = {0927-6505},
  doi       = {10.1016/j.astropartphys.2014.07.012},
  pages     = {47 -- 53},
  year      = {2015},
  abstract  = {While N-body simulations suggest a cuspy profile in the centra of the dark matter halos of galaxies, the majority of astronomical observations favor a relatively soft cored density distribution of these regions. The routine method of testing the convergence of N-body simulations (in particular, the negligibility of two-body scattering effect) is to find the conditions under which formed structures is insensitive to numerical parameters. The results obtained with this approach suggest a surprisingly minor role of the particle collisions: the central density profile remains untouched and close to the Navarro-Frenk-White shape, even if the simulation time significantly exceeds the collisional relaxation time tau(r). In order to check the influence of the unphysical test body collisions we use the Fokker-Planck equation. It turns out that a profile rho proportional to r(-beta) where beta similar or equal to 1 is an attractor: the Fokker-Planck diffusion transforms any reasonable initial distribution into it in a time shorter than tau(r), and then the cuspy profile should survive much longer than tau(r), since the Fokker-Planck diffusion is self-compensated if beta similar or equal to 1. Thus the purely numerical effect of test body scattering may create a stable NFW-like pseudosolution. Moreover, its stability may be mistaken for the simulation convergence. We present analytical estimations for this potential bias effect and call for numerical tests. For that purpose, we suggest a simple test that can be performed as the simulation progresses and would indicate the magnitude of the collisional influence and the veracity of the simulation results. (C) 2014 Elsevier B.V. All rights reserved.},
  language  = {en}
}
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  title     = {Introducing the CTA concept},
  series = {Astroparticle physics},
  volume    = {43},
  journal   = {Astroparticle physics},
  number    = {2},
  publisher = {Elsevier},
  address   = {Amsterdam},
  organization    = {CTA Consortium},
  issn      = {0927-6505},
  doi       = {10.1016/j.astropartphys.2013.01.007},
  pages     = {3 -- 18},
  year      = {2013},
  abstract  = {The Cherenkov Telescope Array (CTA) is a new observatory for very high-energy (VHE) gamma rays. CTA has ambitions science goals, for which it is necessary to achieve full-sky coverage, to improve the sensitivity by about an order of magnitude, to span about four decades of energy, from a few tens of GeV to above 100 TeV with enhanced angular and energy resolutions over existing VHE gamma-ray observatories. An international collaboration has formed with more than 1000 members from 27 countries in Europe, Asia, Africa and North and South America. In 2010 the CTA Consortium completed a Design Study and started a three-year Preparatory Phase which leads to production readiness of CTA in 2014. In this paper we introduce the science goals and the concept of CTA, and provide an overview of the project.},
  language  = {en}
}
@misc{AcharyaAramoBabicetal.2015,
  author    = {Acharya, B. S. and Aramo, C. and Babic, A. and Barrio, J. A. and Baushev, Anton N. and Tjus, J. Becker and Berge, David and Bohacova, M. and Bonardi, A. and Brown, A. and Bugaev, V. and Bulik, Tomasz and Burton, M. and Busetto, G. and Caraveo, P. A. and Carosi, R. and Carr, John and Chadwick, Paula M. and Chudoba, J. and Conforti, V. and Connaughton, V. and Contreras, J. L. and Cotter, G. and Dazzi, F. and De Franco, A. and de la Calle, I. and Lopez, R. de los Reyes and De Lotto, B. and De Palma, F. and Di Girolamo, T. and Di Giulio, C. and Di Pierro, F. and Dournaux, J. -L. and Dwarkadas, Vikram V. and Ebr, J. and Egberts, Kathrin and Fesquet, M. and Fleischhack, H. and Font, L. and Fontaine, G. and Foerster, A. and F{\"u}ßling, Matthias and Garcia, B. and Lopez, R. Garcia and Garczarczyk, M. and Gargano, F. and Garrido, D. and Gaug, M. and Giglietto, N. and Giordano, F. and Giuliani, A. and Godinovic, N. and Gonzalez, M. M. and Grabarczyk, T. and Hassan, T. and Hoerandel, J. and Hrabovsky, M. and Hrupec, D. and Humensky, T. B. and Huovelin, J. and Jamrozy, M. and Janecek, P. and Kaaret, P. E. and Katz, U. and Kaufmann, S. and Khelifi, B. and Kluzniak, W. and Kocot, J. and Komin, N. and Kubo, H. and Kushida, J. and Lamanna, G. and Lee, W. H. and Lenain, J. -P. and Lohse, T. and Lombardi, S. and Lopez-Coto, R. and Lopez-Oramas, A. and Lucarelli, F. and Maccarone, M. C. and Maier, G. and Majumdar, P. and Malaguti, G. and Mandat, D. and Mazziotta, Mario Nicola and Meagher, K. and Mirabal, N. and Morselli, A. and Moulin, E. and Niemiec, J. and Nievas, M. and Nishijima, K. and Nosek, D. and Nunio, F. and Ohishi, M. and Ohm, S. and Ong, R. A. and Orito, R. and Otte, N. and Palatka, M. and Pareschi, G. and Pech, M. and Persic, M. and Pohl, Manuela and Prouza, M. and Quirrenbach, A. and Raino, S. and Fernandez, G. Rodriguez and Romano, Patrizia and Rovero, A. C. and Rudak, B. and Schovanek, P. and Shayduk, M. and Siejkowski, H. and Sillanpaa, A. and Stefanik, S. and Stolarczyk, T. and Szanecki, M. and Szepieniec, T. and Tejedor, L. A. and Telezhinsky, Igor O. and Teshima, M. and Tibaldo, L. and Tibolla, O. and Tovmassian, G. and Travnicek, P. and Trzeciak, M. and Vallania, P. and van Eldik, C. and Vercellone, S. and Vigorito, C. and Wagner, S. J. and Wakely, S. P. and Weinstein, A. and Wierzcholska, A. and Wilhelm, Alina and Wojcik, P. and Yoshikoshi, T.},
  title     = {The Cherenkov Telescope Array potential for the study of young supernova remnants},
  series = {Astroparticle physics},
  volume    = {62},
  journal   = {Astroparticle physics},
  publisher = {Elsevier},
  address   = {Amsterdam},
  issn      = {0927-6505},
  doi       = {10.1016/j.astropartphys.2014.08.005},
  pages     = {152 -- 164},
  year      = {2015},
  abstract  = {Supernova remnants (SNRs) are among the most important targets for gamma-ray observatories. Being prominent non-thermal sources, they are very likely responsible for the acceleration of the bulk of Galactic cosmic rays (CRS). To firmly establish the SNR paradigm for the origin of cosmic rays, it should be confirmed that protons are indeed accelerated in, and released from, SNRs with the appropriate flux and spectrum. This can be done by detailed theoretical models which account for microphysics of acceleration and various radiation processes of hadrons and leptons. The current generation of Cherenkov telescopes has insufficient sensitivity to constrain theoretical models. A new facility, the Cherenkov Telescope Array (CTA), will have superior capabilities and may finally resolve this long standing issue of high-energy astrophysics. We want to assess the capabilities of CTA to reveal the physics of various types of SNRs in the initial 2000 years of their evolution. During this time, the efficiency to accelerate cosmic rays is highest. We perform time-dependent simulations of the hydrodynamics, the magnetic fields, the cosmic-ray acceleration, and the non-thermal emission for type Ia, Ic and IIP SNRs. We calculate the CTA response to the y-ray emission from these SNRs for various ages and distances, and we perform a realistic analysis of the simulated data. We derive distance limits for the detectability and resolvability of these SNR types at several ages. We test the ability of CTA to reconstruct their morphological and spectral parameters as a function of their distance. Finally, we estimate how well CTA data will constrain the theoretical models. (C) 2014 Elsevier B.V. All rights reserved.},
  language  = {en}
}