Results 21 to 30 of about 73,052 (295)

MODIFIED GRAVITY SPINS UP GALACTIC HALOS [PDF]

The Astrophysical Journal, 2012
Accepted for publication in ApJ, a result of the KS test added, discussion ...
Lee, J., Zhao, G., Li, B., Koyama, K.
openaire   +4 more sources

Substructure Boosts to Dark Matter Annihilation from Sommerfeld Enhancement [PDF]

, 2009
The recently introduced Sommerfeld enhancement of the dark matter annihilation cross section has important implications for the detection of dark matter annihilation in subhalos in the Galactic halo.
F. A. Aharonian, G. Tormen, J. Binney, J. Diemand, J. Einasto, J. Einasto, J. March-Russell, J. F. Navarro, Jo Bovy, M. Kuhlen, S. Cole, V. R. Eke   +11 more
core   +2 more sources

Low Frequency Gravitational Waves from White Dwarf MACHO Binaries [PDF]

, 2000
The possibility that Galactic halo MACHOs are white dwarfs has recently attracted much attention. Using the known properties of white dwarf binaries in the Galactic disk as a model, we estimate the possible contribution of halo white dwarf binaries to ...
Ben Kulick, Giampieri G., Joshua R. Routzahn, Shane L. Larson, William A. Hiscock   +4 more
core   +2 more sources

CMB as a possible new tool to study the dark baryons in galaxies [PDF]

, 2012
Baryons constitute about 4% of our universe, but most of them are missing and we do not know where and in what form they are hidden. This constitute the so-called missing baryon problem.
A A Nucita, A L Kashin, A Qadir, Ade P A R (Planck Collaboration), Alcock C, Anderson M E, Ansari R, Ashman K M, Aurière M, Bennett C L, Binney J, Binney J, Bregman J N, Calchi Novati, Calchi Novati S, Ceccarelli C, Cen R, Cen R, Chemin L, Chiappini C, Cooray A, Courteau S, D Vetrugno, Dai X, De Paolis F, De Paolis F, De Paolis F, De Paolis F, Draine B, Drake A J, F De Paolis, G Ingrosso, Gerhard O, Grenacher L, Gurzadyan V G, H G Khachatryan, Hoekstra H, Jarosik N, Larson R B, Lin C Y, Oort J H, Pfenniger D, Pfenniger D, Pfenniger D Combes F, Ph Jetzer, Richter P, Riffeser A, S Mirzoyan, Sommer-Larsen J, V G Gurzadyan, Wakker B P, Walker M   +51 more
core   +1 more source

The Chemical Evolution of the Draco Dwarf Spheroidal Galaxy [PDF]

, 2009
We present an abundance analysis based on high resolution spectra of 8 stars selected to span the full range in metallicity in the Draco dwarf spheroidal galaxy. We find [Fe/H] for the sample stars ranges from -1.5 to -3.0 dex.
Cohen, Judith G., Huang, Wenjin
core   +2 more sources

The Disk-Halo Distinction of Galaxies Using Faraday Tomography

Galaxies, 2018
Faraday tomography allows us to study the distribution and properties of the magnetoionic medium of galaxies through the Faraday effect. However, this can be achieved only after the Faraday spectrum is interpreted.
Shinsuke Ideguchi
doaj   +1 more source

A simple multistage closed-(box+reservoir) model of chemical evolution [PDF]

Serbian Astronomical Journal, 2011
Simple closed-box (CB) models of chemical evolution are extended on two respects, namely (i) simple closed-(box+reservoir) (CBR) models allowing gas outflow from the box into the reservoir (Hartwick 1976) or gas inflow into the box from the ...
Caimmi R.
doaj   +1 more source

Vacuum Polarization Instead of “Dark Matter” in a Galaxy

Universe, 2022
We considered a vacuum polarization inside a galaxy in the eikonal approximation and found that two possible types of polarization exist. The first type is described by the equation of state p=ρ/3, similar to radiation.
Sergey L. Cherkas, Vladimir L. Kalashnikov   +1 more
doaj   +1 more source

Estimation of Galactic Model Parameters and Metalicity Distribution in Intermediate Latitudes with SDSS [PDF]

, 2009
We estimated the galactic model parameters for a set of 20 intermediate-latitude fields with galactic longitudes ...
Adelman-McCarthy, Ak, Ak, Alves, Belokurov, Bertin, Bilir, Bilir, Bilir, Bilir, Bilir, Bilir, Brosche, Buser, Buser, Cabrera-Lavers, Carollo, Chen, de Vaucouleurs, Debattista, Drimmel, Du, Du, E. Yaz, Fan, Fukugita, Gilmore, Gilmore, Griffin, Halbwachs, Helmi, Hernquist, Jurić, Karaali, Karaali, Karaali, Kent, Kroupa, Kroupa, Kroupa, López-Corredoira, López-Corredoira, Malmquist, Marshall, Momany, Narayan, Newberg, Odenkirchen, Phleps, Phleps, Reid, Reid, S. Karaali, Schlegel, Siegel, Xu, Young   +56 more
core   +2 more sources

Galactic halos of fluid dark matter [PDF]

Physical Review D, 2003
Dwarf spiral galaxies - and in particular the prototypical DDO 154 - are known to be completely dominated by an unseen component. The putative neutralinos - so far the favored explanation for the astronomical dark matter - fail to reproduce the well measured rotation curves of those systems because these species tend to form a central cusp whose ...
Arbey, Alexandre, Lesgourgues, Julien, Salati, Pierre   +2 more
openaire   +2 more sources