منابع مشابه
Hi in the galactic halo
We find solid evidence for diffuse Hi gas at substantial z heights in our Galaxy, with a velocity dispersion of σ = 60 km s −1 and a vertical projected column density of N Hi = 1.4 · 10 19 cm −2. This pervasive component of the emission spectrum could be identified in the Leiden/Dwingeloo 21-cm Survey (LDS) after increasing the accuracy further by correcting the observations for reflections fro...
متن کاملThe HI halo of NGC 2403
The position-velocity diagram along the major axis of the Sc galaxy NGC 2403 shows the presence of gas with anomalous velocities (see Fig. 3 of the paper by Sancisi et al., this conference). This is the signature of an extended, slower rotating HI halo surrounding the thin disk (Schaap et al., 2000) We have isolated the ‘anomalous gas’ in NGC 2403 by fitting a Gaussian line profile to the thin ...
متن کاملThe Halo Occupation Distribution of HI Galaxies
We perform an analysis of the spatial clustering properties of HI selected galaxies from the HI Parkes All Sky Survey (HIPASS) using the formalism of the halo occupation distribution (HOD). The resulting parameter constraints show that the fraction of satellite galaxies (i.e. galaxies which are not the central member of their host dark matter halo) among HIPASS galaxies is < 20%, and that satel...
متن کاملThe Galactic X-ray halo
Weanalyzed the intensity distribution of the 3/4 keV and 1/4 keV diffuse soft X-ray background by correlating the ROSAT all-sky survey with the Leiden/Dwingeloo H i survey. We found that the 3/4 keV and 1/4 keV intensity distributions can be modelled by a contribution from an isothermal (kT = 0.135 keV) flattened X-ray halo superposed on the radiation from an extragalactic X-ray background. The...
متن کاملIs the Galactic Halo Baryonic ?
Recent observations of microlensing events in the Large Magel-lanic Cloud suggest that a sizeable fraction of the galactic halo is in the form of Massive Astrophysical Compact Halo Objects (MACHOs) with mass less than about 0.1M ⊙. Here we argue that molecular clouds (mainly of H 2) located in the galactic halo can contribute substantially to its total mass. We outline a scenario in which dark ...
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ژورنال
عنوان ژورنال: International Astronomical Union Colloquium
سال: 1997
ISSN: 0252-9211
DOI: 10.1017/s0252921100071475