Cross-correlation of the DIRBE 100 mu m survey with previously published Hα maps tests correlations between far-infrared dust and the warm ionized interstellar medium in different regions of the sky. A 10arcdeg x 12arcdeg patch at Galactic latitude b = -21arcdeg shows a correlation slope a_0 = 0.85 +/- 0.44 Rayleighs MJy(-1) sr significant at 97% confidence. A set of Hα images over the north celestial polar cap yields a weaker correlation slope a_0 = 0.34 +/- 0.33 Rayleighs MJy(-1) sr. Combined with observations from microwave anisotropy experiments, the data show roughly similar correlations on angular scales 0\fdg7 to 90\arcdeg. Microwave experiments may observe more emission per unit dust emission than are traced by the same structures observed in Hα .
The Astronomical Journal
- Pub Date:
- September 1997
- INFRARED: ISM: CONTINUUM;
- ISM: STRUCTURE;
- RADIATION MECHANISMS: NON-THERMAL;
- LaTeX with 5 PostScript figures, 11 pages total. Accepted for publication in The Astronomical Journal, September 1997 issue