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Probing the local bubble with diffuse interstellar abnds. II. The Dib properties in the northern hemisphere

Van Loon

Probing the local bubble with diffuse interstellar abnds. II. The Dib properties in the northern hemisphere Thumbnail


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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 ?5780 Å and ?5797 Å diffuse interstellar bands (DIBs). We observed 432 sightlines to a distance of 200 pc over a duration of three years. In this study, we establish the ?5780 and ?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 ?5780 is stronger than its correlation with ?5797, suggesting that ?5780 is more associated with regions where Ca+ is more abundant. We study the ?5780 correlation with ?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, ?5797 is located in denser parts of clouds, protected from UV irradiation, while ?5780 is located in the low-density regions of clouds.

Citation

Van Loon. (2015). Probing the local bubble with diffuse interstellar abnds. II. The Dib properties in the northern hemisphere. Astrophysical Journal, https://doi.org/10.1088/0004-637X/800/1/64

Acceptance Date Nov 25, 2014
Publication Date Feb 10, 2015
Journal Astrophysical Journal
Print ISSN 0004-637X
Publisher American Astronomical Society
DOI https://doi.org/10.1088/0004-637X/800/1/64
Keywords ISM: abundances, ISM: bubbles, ISM: clouds, ISM: lines and bands, stars: atmosphere
Publisher URL https://doi.org/10.1088/0004-637X/800/1/64

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