Large scale 21 CM H I observations of the CYG OB1/OB3 supershell

Details Large scale 21 CM H I observations of the CYG OB1/OB3 supershell Large scale 21 CM H I observations of the CYG OB1/OB3 supershell

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aj....108.2212d&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 108, no. 6, p. 2212-2219

Astronomy and Astrophysics

Astronomy

19

Bubbles, Hydrogen, Interstellar Gas, Radio Astronomy, Velocity Distribution, Infrared Astronomy Satellite, Infrared Spectra, Morphology, Radio Spectra, Visible Spectrum

Scientific paper

We present new large-scale 21 cm H I observations of the Cyg OB1/OB3 supershell, which is visible with varying degrees of prominence in the IR, radio, and optical ranges. Our data reveal a 4.6x6.1 deg H I feature, larger than the IR and optical supershell. A shell-like structure of neutral gas is seen over a wide velocity range (+30 to -70 km/s) with a possible expansion velocity up to about 30 to 50 km/s. The H I morphology varies substantially in different velocity ranges, implying a very irregular shape of the shell. The mass of the H I supershell is estimated to be 5400 to 13,000 solar masses. The H I supershell that we have detected most likely represents the huge superbubble hypothesized by Nichols-Bohlin & Fesen (1993) from observations along individual lines of sight to stars in Cygnus region.

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