5k citations · 37.1k across the 535 of their papers we have counts for
15 papers · 1 filter
Cosmic rays, lithium abundance and excess entropy in galaxy clusters
Biman B. Nath, Piero Madau, Joseph Silk
We consider the production of Li in spallation reactions by cosmic rays in order to explain the observed abundance in halo metal-poor stars. We show that heating of ambient gas…
AGN Feedback Causes Downsizing
Evan Scannapieco, Joseph Silk, Rychard Bouwens
We study the impact of outflows driven by active galactic nuclei (AGN) on galaxy formation. Outflows move into the surrounding intergalactic medium (IGM) and heat it sufficiently t…
A New Signature of Dark Matter Annihilations: Gamma-Rays from Intermediate-Mass Black Holes
Gianfranco Bertone, Andrew R. Zentner, Joseph Silk
We study the prospects for detecting gamma-rays from Dark Matter (DM) annihilations in enhancements of the DM density (mini-spikes) around intermediate-mass black holes with masses…
Hierarchical Growth and Cosmic Star Formation: Enrichment, Outflows and Supernova Rates
Frederic Daigne, Keith A. Olive, Joe Silk +2
The cosmic star formation histories are evaluated for different minimum masses of the initial halo structures, with allowance for realistic gas outflows. With a minimum halo mass o…
Non-parametric reconstruction of the primordial power spectrum at horizon scales from WMAP data
Domenico Tocchini-Valentini, Yehuda Hoffman, Joseph Silk
We extend to large scales a method proposed in previous work that reconstructs non-parametrically the primordial power spectrum from cosmic microwave background data at high resolu…
Ultraluminous Starbursts from SMBH-induced outflows
Joseph Silk
I argue that there are two modes of global star formation. Disks and smaller spheroids form stars relatively inefficiently as a consequence of supernova-triggered negative feedback…
Observational Evidence for Extra Dimensions from Dark Matter
Bo Qin, Ue-Li Pen, Joseph Silk
Recent astronomical observations of systems of dark matter, which have been cited as providing possible support for self-interacting cold dark matter, may provide evidence for the…
Tidal Destruction of The First Dark Microhalos
HongSheng Zhao, Dan Hooper, Garry W. Angus +2
We point out that the usual self-similarity in cold dark matter models is broken by encounters with individual normal galactic stars on sub-pc scale. Tidal heating and stripping mu…
Did Boomerang hit MOND?
Anze Slosar, Alessandro Melchiorri, Joseph Silk
Purely baryonic dark matter dominated models like MOND based on modification of Newtonian gravity have been successfully in reproducing some dynamical properties of galaxies. More…
New constraints on MOND from galaxy clusters
Etienne Pointecouteau, Joseph Silk
We revisit the application of Modified Newtonian Dynamics (MOND) to galaxy clusters. We confront the high quality X-ray data for eight clusters of galaxies observed by the \xmm sat…
Probing the Origins of Voids in the Distribution of Galaxies
Louise M. Ord, Martin Kunz, Hugues Mathis +1
If the voids that we see today in the distribution of galaxies existed at recombination, they will leave an imprint on the cosmic microwave background (CMB). On the other hand, if…
Earth-mass dark halos are torn into dark mini-streams by stars
HongSheng Zhao, James E. Taylor, Joseph Silk +1
The promising neutralino dark matter particles generically condense into numerous earth-mass dark halos with smaller substructures suppressed by free streaming\cite{berezinsky}. Th…
Probing the origins of voids with the CMB
L. M. Ord, M. Kunz, H. Mathis +1
In this talk presented at the 5th Rencontres du Vietnam 2004, we discuss our preliminary investigations into voids of primordial origin. We show that if voids in the cold dark matt…
Mini-dark halos with intermediate mass black holes
HongSheng Zhao, Joseph Silk
We argue that the Milky Way (MW) contains thousands intermediate mass black holes (IMBHs) and minihalos with a fraction of IMBHs still being enshrouded in extremely dense mini-spik…
Reconstruction of primordial density fields
Roya Mohayaee, Hugues Mathis, Stephane Colombi +1
The Monge-Ampere-Kantorovich (MAK) reconstruction is tested against cosmological N-body simulations. Using only the present mass distribution sampled with particles, and the assump…