342 datasets found

Keywords: h i line emission

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  • A search for Compact High-Velocity Clouds

    An automated search is applied to the Leiden/Dwingeloo HI Survey (LDS) for high-velocity clouds north of Dec.=-28{deg}. From the general catalog we extract a sample of...
  • Bell Laboratories H I Survey

    The sky north of declination -40{deg} was observed in the 21cm line of atomic hydrogen with the FWHM=2{deg} beam of the 20 foot horn reflector at AT&T Bell Laboratories,...
  • High galactic latitude HI absorption survey

    We have used the Giant Meterwave Radio Telescope (GMRT) to measure the Galactic HI 21-cm line absorption towards 102 extragalactic radio continuum sources, located at high...
  • HAPLESS galaxies sample

    We present the properties of the first 250 {mu}m blind sample of nearby galaxies (15
  • Choirs, HI galaxy groups

    H{alpha} observations centred on galaxies selected from the Hi Parkes All-Sky Survey (HiPASS) typically show one and sometimes two star-forming galaxies within the ~15arcmin...
  • Millennium Arecibo 21-cm Survey

    We review the theory of measuring spectral lines in emission/ absorption observations and apply it to a new survey of the 21-cm line against 79 continuum sources. We develop an...
  • HI and CO observations of M33 interstellar medium

    We utilize the multi-wavelength data of M33 to study the origin of turbulence in its interstellar medium. We find that the HI turbulent energy surface density inside 8kpc is...
  • Detected sources in the region of Magellanic Stream

    We present a study of the discrete clouds and filaments in the Magellanic Stream using a new high-resolution survey of neutral hydrogen (H I) conducted with the H75 array of the...
  • Kinematic distance ambiguity in HII regions

    Using H I absorption spectra from the International Galactic Plane Survey, a new method is implemented to resolve the kinematic distance ambiguity for 75 H II regions with known...
  • Compact H I clouds from the GALFA-H I survey

    The Galactic Arecibo L-band Feed Array H I (GALFA-H I) survey is mapping the entire Arecibo sky at 21 cm, over a velocity range of -700 to +700 km/s (LSR), at a velocity...
  • GASS HI survey of the lower halo

    We have detected over 400 HI clouds in the lower halo of the Galaxy within the pilot region of the Galactic All-Sky Survey (GASS), a region of the fourth quadrant that spans...
  • HI self-absorption (HISA) survey in the CGPS

    We present a 21cm line HI self-absorption (HISA) survey of cold atomic gas within Galactic longitudes l=75{deg} to 146{deg} and latitudes b=-3{deg} to +5{deg}. We identify HISA...
  • The Arecibo Legacy Fast ALFA survey. II

    In preparation for the full Arecibo Legacy Fast ALFA (ALFALFA) extragalactic HI survey, precursor observations were carried out in 2004 August-September with the seven-beam...
  • HIPASS high-velocity clouds

    A catalog of southern anomalous-velocity HI clouds at {delta}<+2{deg} is presented. This catalog is based on data from the HI Parkes All-Sky Survey (HIPASS) reprocessed with...
  • CHEX-MATE clusters hydrogen column densities

    The X-ray spectrum of extragalactic sources, such as galaxy clusters, is affected by the photo-absorption of various components of the Galactic interstellar medium (ISM). The...
  • Low-Redshift Lyman Continuum Survey

    Combining 66 ultraviolet (UV) spectra and ancillary data from the recent Low-Redshift Lyman Continuum Survey (LzLCS) and 23 LyC observations by earlier studies, we form a...
  • Galactic HI supershells kinetic energies

    We estimate the Galactic supershell (GS) masses and energies. We developed and used an automatic algorithm. The study was carried out making use of the Leiden-Argentine-Bonn...
  • HI4PI spectra and column density maps

    Measurement of the Galactic neutral atomic hydrogen (HI) column density, NHI, and brightness temperatures, Tb, is of high scientific value for a broad range of astrophysical...
  • THOR. The HI, OH, Recombination Line Survey

    To study the atomic, molecular and ionized emission of Giant Molecular Clouds (GMCs), we have initiated a Large Program with the VLA: 'THOR - The HI, OH, Recombination Line...
  • HI synthesis observations in UMa cluster

    In this data paper we present the results of an extensive 21 cm-line synthesis imaging survey of 43 spiral galaxies in the nearby Ursa Major cluster using the Westerbork...
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