Probing the Local Bubble with Diffuse Interstellar Bands. II. The DIB properties in the Northern hemisphere

Abstract

We present a new high signal to noise ratio spectroscopic survey of the Northern hemisphere to probe the Local Bubble and its surroundings using the $\lambda 5780$ Å and $\lambda 5797$ Å Diffuse Interstellar Bands (DIBs). We observed 432 sightlines to a distance of 200 pc over a duration of 3 years. In this study, we establish the $\lambda 5780$ and $\lambda 5797$ correlations with Na I, Ca II and E(B-V), for both inside and outside the Local Bubble. The correlations show that among all neutral and ionized atoms, the correlation between Ca II and $\lambda 5780$ is stronger than its correlation with $\lambda 5797$, suggesting that $\lambda 5780$ is more associated with regions where Ca${}^{+}$ is more abundant. We study the $\lambda 5780$ correlation with $\lambda 5797$, which shows a tight correlation within and outside the Local Bubble. In addition we investigate the DIB properties in UV irradiated and UV shielded regions. We find that, within and beyond the Local Bubble, $\lambda 5797$ is located in denser parts of clouds, protected from UV irradiation, while $\lambda 5780$ is located in the low density regions of clouds.

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