Galactic worms. I - Catalog of worm candidates
B. C. Koo, C. Heiles, W. T. Reach;
ApJ, 1992, 390, 108
ABSTRACT:A catalog of candidates for the Galactic worms that are possibly the walls surrounding the superbubbles is compiled; 118 isolated
structures that appear both in H I and in IR (60 and 100 microns).
Fifty-two are
possibly associated with H II regions.
It is found that the 100-micron
emissivity increases systematically toward the Galactic interior, which is
consistent with the increase of the general interstellar radiation field.
The
100-micron emissivity of the structures associated with the H II regions is larger
than that of the structures without associated H II regions.
The
60-100-micron ratio is large, 0.28 +/- 0.03, which may indicate that the grains
associated with the atomic gas have a relatively large population of small
grains.
Thirty-five structures appear in the 408-MHz continuum.
The IR and the radio
continuum properties suggest that the 408-MHz continuum emission in those
structures is very likely thermal.
The implications of these results on the
ionization of gas far from the Galactic plane are discussed.
KEYWORDS: bubbles, h i regions, h ii regions, infrared astronomy, milky way galaxy, radio astronomy, astronomical catalogs, astronomical maps, continuous radiation, galactic nuclei, line spectra, statistical analysis
PERSOKEY:21 cm, h_i, h+, supershell, ,
CODE: koo92