Search for Infrared Emission from the Leo Extragalactic HI Cloud

Details Search for Infrared Emission from the Leo Extragalactic HI Cloud Search for Infrared Emission from the Leo Extragalactic HI Cloud

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20626h&link_type=abstract

Spitzer Proposal ID #20626

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Scientific paper

We propose to map at 8, 24, 70 and 160um the one intergalactic HI cloud that has remained undetected at any wavelength other than the 21-cm HI line. The Leo Cloud was discovered serendipitously, and mapped subsequently in detail at both Arecibo and the VLA. The radio data reveal kinematic and spatial structure that rules out an origin as a recent tidal tail, leaving most likely the scenario that this is primordial, relatively pristine material. A detection of the dust emission from the Cloud would provide the only radiative manifestation other than HI, and would allow us to estimate the dust content of the Cloud, and therefore its metallicity. Even an upper limit would help constrain its origin and history.

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