منابع مشابه
Molecular Gas in the Galactic Halo and Beyond
I review recent observations of molecular gas in the halo of the Milky Way and in the Magellanic Clouds. Far-ultraviolet absorption line studies of molecular hydrogen (H2) with ORFEUS and FUSE have unveiled the presence of a diffuse molecular hydrogen component in intermediateand high-velocity clouds in the Galactic halo. Although the number of measurements is still quite small, the data sugges...
متن کاملHi 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 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 ...
متن کاملThe Hydrogen Clouds in the Galactic Halo
New 21cm observations with the Green Bank Telescope (GBT) show that a significant fraction of the HI in the inner Galaxy’s halo ∼ 1 kpc from the midplane exists in the form of discrete clouds. Some look very much like a Spitzer (1968) “standard” diffuse cloud but with their HI in two phases. They mark the transition between the neutral disk and the highly ionized halo. The dominant motion of th...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2012
ISSN: 0004-637X,1538-4357
DOI: 10.1088/0004-637x/745/2/148