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Astrophysicists produce the first age map of the halo of the Milky Way
Astrophysicists first age map Milky Way
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2015/11/12
University of Notre Dame astronomer Timothy Beers and his Galactic Archaeology group, which includes Notre Dame astronomers Daniela Carollo and Vinicius Placco, have led an international team of resea...
The Halo and Rings of the Planetary Nebula NGC 40 in the Mid-Infrared
the Planetary Nebula NGC 40 the Mid-Infrared
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2011/1/10
We present imaging and spectroscopy of NGC 40 acquired using the Spitzer Space Telescope (Spitzer), and the Infrared Space observatory (ISO). These are used to investigate the nature of emission from ...
The Spatial Clustering of ROSAT All-Sky Survey AGNs II. Halo Occupation Distribution Modeling of the Cross Correlation Function
The Spatial Clustering ROSAT All-Sky Survey AGNs II
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2011/1/11
This is the second paper of a series that reports on our investigation of the clustering properties of AGNs in the ROSAT All-Sky Survey (RASS) through cross-correlation functions (CCFs) with Sloan Dig...
A Halo Model of Local IRAS Galaxies Selected at 60 Micron Using Conditional Luminosity Functions
Local IRAS Galaxies Selected 60 Micron
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2011/1/11
Using conditional luminosity functions (CLFs) which encode the luminosity distribution of galaxies as a function of halo mass, we construct a halo model of IRAS galaxies selected at 60 micron. An abun...
Anyone out there? Galactic Halo Post-AGB stars
Galactic Halo Post-AGB stars
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2011/1/11
We present results of a survey of post-asymptotic giant branch stars (post-AGBs) at high galactic latitude. To date, few post-AGB stars are known throughout the Galaxy and the number of known members ...
Primordial non-Gaussianity in the Bispectrum of the Halo Density Field
Inflation Large Scale Structure Primordial non-Gaussianity
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2010/11/11
The bispectrum vanishes for linear Gaussian elds and is thus a sensitive probe of non-
linearities and non-Gaussianities in the cosmic density eld. Hence, a detection of the bispectrum in the halo ...
Large scale anisotropies on halo infall
large scale structures overdensities infall statistical haloes
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2010/11/15
We perform a statistical analysis of the peculiar velocity field around dark mat-
ter haloes in numerical simulations. We examine different properties of the infall of
material onto haloes and its r...
Physical Properties of Complex C Halo Clouds
rgalactic medium − ISM structure − ISM
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2010/11/9
Observations from the Galactic Arecibo L-Band Feed Array HI (GALFA-HI)Survey of the tail of Complex C are presented and the halo clouds associated with this complex cataloged. The properties of the Co...
Linking haloes to galaxies: how many halo properties are needed?
galaxies formation
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2010/11/15
Recent studies emphasize that an empirical relation between the stellar mass of galaxies and
the mass of their host dark matter subhaloes can predict the clustering of galaxies and its
evolution wit...
A Two-Point Correlation Function For Galactic Halo Stars
galaxies – Milky Way formation
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2010/11/12
We describe a correlation function statistic that quantifies the amount of spatial and kinematic substructure in the stellar halo.We test this statistic using model stellar halo realizations construct...
Quantifying Kinematic Substructure in the Milky Way's Stellar Halo
Cosmology stellar halo galaxies individual(Milky Way) Galaxy halo Galaxy
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2010/11/12
We present and analyze the positions, distances, and radial velocities for over 4000 blue horizontal-branch (BHB) stars in the Milky Way's halo, drawn from SDSS DR8. We search for position-velocity su...
The Galactic halo magnetic field revisited
The Galactic halo magnetic field
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2011/1/10
Recently, Sun et al. (2008) published new Galactic 3D-models of magnetic fields in the disk and halo of the Milky Way and the distribution of cosmic-ray electron density by taking into account the the...
Modelling the HI halo of the Milky Way
Galaxy Astrophysics (astro-ph.GA)
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2011/1/7
We studied the global distribution and kinematics of the extra-planar neutral gas in the Milky Way.
The Origin of Dark Matter Halo Profiles
Cosmology and Extragalactic Astrophysics (astro-ph.CO) Galaxy Astrophysics (astro-ph.GA)
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2010/12/29
A longstanding puzzle of fundamental importance in modern cosmology has been the origin of the nearly universal density profiles of dark matter halos found in N-body simulations -- the so-called NFW p...
Could the Hercules satellite be a stellar stream in the Milky Way halo?
Galaxy Astrophysics (astro-ph.GA)
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2010/12/29
We investigate the possibility that Hercules, a recently discovered Milky Way (MW) satellite, is a stellar stream in the process of formation. This hypothesis is motivated by Hercules' highly elongate...