The Draco Nebula, a molecular cloud associated with a high velocity cloud?

Details The Draco Nebula, a molecular cloud associated with a high velocity cloud? The Draco Nebula, a molecular cloud associated with a high velocity cloud?

Nov 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984nascp2345..249m&link_type=abstract

In NASA. Goddard Space Flight Center Local Interstellar Medium, No. 81 p 249-252 (SEE N85-15539 06-90)

Astronomy and Astrophysics

Astronomy

5

Brightness Temperature, Hydrogen, Molecular Clouds, Nebulae, Brightness Distribution, Carbon Monoxide, Emission Spectra, Photometry, Sky Surveys (Astronomy), Telescopes, Virial Theorem

Scientific paper

Extended and very faint bright nebulae are found in high galactic latitudes at the Palomar Observatory Sky Survey. Such a nebula, located in the constellation Draco and called Draco Nebula or Dracula, was found to be in detailed positional coincidence with a 21 cm emission line feature. Estimates of the minimum visual extinction from star counts ON and OFF Dracula and an estimated visual surface brightness indicate that Dracula fits the relation SBV = 24.2 - 2.5 log AV for dust clouds located above the galactic plane and reflecting the integrated starlight of the galactic disk. Hence Dracula is probably a reflection nebula. Indicators of molecular hydrogen in Dracula, molecules such as CO, were searched for by using a 2.5-m mm-telescope. Molecular hydrogen column densities were estimated. The dynamics of CO clumps was studied. Dracula has a close positional and possibly even astrophysical relationship to the high velocity cloud phenomenon.

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