Spatial Correlation Between Dust and Diffuse Ionized Gas

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

Cross-correlation between the COBE full sky surveys shows spatial correlations between microwave emission from the warm ionized interstellar medium and far-infrared emission from high-latitude (|b| > 20(deg) ) dust cirrus on angular scales larger than 7(deg) . The amplitude of the correlated component agrees well with estimates of the total emission from the warm ionized medium, suggesting that the correlated component forms a significant fraction of the warm ionized interstellar medium on large angular scales. Cross-correlations of Hα maps with the DIRBE 100 mu m survey show statistically significant correlations on angular scales from 0.7 to 7 degrees. I discuss possible variation of the correlation as a function of angular scale.

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