178 citations · 782 across the 16 of their papers we have counts for
13 papers · 1 filter
Are ring galaxies the ancestors of giant low surface brightness galaxies?
M. Mapelli, B. Moore, E. Ripamonti +4
Giant low surface brightness galaxies (GLSBs) have flat discs extending up to ~100 kpc. Their formation is a puzzle for cosmological simulations in the cold dark matter scenario. W…
The origin of lopsidedness in galaxies
M. Mapelli, B. Moore, J. Bland-Hawthorn
It has long been known that a large fraction of disc galaxies are lopsided. We simulate three different mechanisms that can induce lopsidedness: flyby interactions, gas accretion f…
Lopsided galaxies: the case of NGC 891
M. Mapelli, B. Moore, J. Bland-Hawthorn
It has been known for a long time that a large fraction of disc galaxies are lopsided. We simulate three different mechanisms that can induce lopsidedness: flyby interactions, gas…
Radiation from early black holes - I: effects on the neutral inter-galactic medium
E. Ripamonti, M. Mapelli, S. Zaroubi
In the pre-reionization Universe, the regions of the inter-galactic medium (IGM) which are far from luminous sources are the last to undergo reionization. Until then, they should b…
Are ring galaxies the ancestors of giant low surface brightness galaxies?
M. Mapelli, B. Moore, E. Ripamonti +3
We simulate the collisional formation of a ring galaxy and we integrate its evolution up to 1.5 Gyr after the interaction. About 100-200 Myr after the collision, the simulated gala…
Blue straggler stars in dwarf spheroidal galaxies
M. Mapelli, E. Ripamonti, E. Tolstoy +3
Blue straggler star (BSS) candidates have been observed in all old dwarf spheroidal galaxies (dSphs), however whether or not they are authentic BSSs or young stars has been a point…
Primordial gas heating by dark matter and structure formation
M. Mapelli, E. Ripamonti
Dark matter (DM) decays and annihilations might heat and partially reionize the Universe at high redshift. Although this effect is not important for the cosmic reionization, the ga…
Constraining DM through 21 cm observations
M. Valdes, A. Ferrara, M. Mapelli +1
Beyond reionization epoch cosmic hydrogen is neutral and can be directly observed through its 21 cm line signal. If dark matter (DM) decays or annihilates the corresponding energy…
The impact of dark matter decays and annihilations on the formation of the first structures
E. Ripamonti, M. Mapelli, A. Ferrara
We derive the effects of DM decays and annihilations on structure formation. We consider moderately massive DM particles (sterile neutrinos and light DM), as they are expected to g…
Intergalactic medium heating by dark matter
E. Ripamonti, M. Mapelli, A. Ferrara
We derive the evolution of the energy deposition in the intergalactic medium (IGM) by dark matter (DM) decays/annihilations for both sterile neutrinos and light dark matter (LDM) p…
Impact of dark matter decays and annihilations on reionization
M. Mapelli, A. Ferrara, E. Pierpaoli
One of the possible methods to distinguish among various dark matter candidates is to study the effects of dark matter decays. We consider four different dark matter candidates (li…
Background radiation from sterile neutrino decay and reionization
M. Mapelli, A. Ferrara
Sterile neutrinos are one of the most promising Warm Dark Matter candidates. By considering their radiative- and pion-decay channels, we derive the allowed contribution of sterile…
The fingerprint of binary intermediate mass black holes in globular clusters: supra-thermal stars and angular momentum alignment
M. Mapelli, M. Colpi, A. Possenti +1
We explore the signatures that a binary intermediate mass black hole (IMBH) imprints on the velocity and on the angular momentum of globular cluster stars. Simulating 3-body encoun…