683 citations · 3.8k across the 26 of their papers we have counts for
10 papers · 1 filter
Hints against the cold and collisionless nature of dark matter from the galaxy velocity function
Aurel Schneider, Sebastian Trujillo-Gomez, Emmanouil Papastergis +2
The observed number of dwarf galaxies as a function of rotation velocity is significantly smaller than predicted by the standard model of cosmology. This discrepancy cannot be simp…
Another baryon miracle? Testing solutions to the "missing dwarfs" problem
Sebastian Trujillo-Gomez, Aurel Schneider, Emmanouil Papastergis +2
The dearth of dwarf galaxies in the local universe is hard to reconcile with the large number of low mass haloes expected within the concordance CDM paradigm. In this paper we p…
Galaxy luminosity function and Tully-Fisher relation: reconciled through rotation-curve studies
Andrea Cattaneo, Paolo Salucci, Emmanouil Papastergis
The relation between galaxy luminosity L and halo virial velocity v_vir required to fit the galaxy luminosity function differs from the observed Tully-Fisher relation between L and…
The clustering of ALFALFA galaxies: dependence on HI mass, relationship to optical samples & clues on host halo properties
Emmanouil Papastergis, Riccardo Giovanelli, Martha P. Haynes +2
We use a sample of ~6000 galaxies detected by the Arecibo Legacy Fast ALFA (ALFALFA) 21cm survey, to measure the clustering properties of HI-selected galaxies. We find no convincin…
A direct measurement of the baryonic mass function of galaxies & implications for the galactic baryon fraction
Emmanouil Papastergis, Andrea Cattaneo, Shan Huang +2
We use both an HI-selected and an optically-selected galaxy sample to directly measure the abundance of galaxies as a function of their "baryonic" mass (stars + atomic gas). Stella…
Gas-Bearing Early-Type Dwarf Galaxies in Virgo: Evidence for Recent Accretion
Gregory Hallenbeck, Emmanouil Papastergis, Shan Huang +7
We investigate the dwarf (M_B> -16) galaxies in the Virgo cluster in the radio, optical, and ultraviolet regimes. Of the 365 galaxies in this sample, 80 have been detected in HI by…