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@article{1673080, author = {Piecka, Martin and Paunzen, Ernst}, article_location = {MALDEN}, article_number = {2}, doi = {http://dx.doi.org/10.1093/mnras/staa1112}, keywords = {dust extinction; ISM: lines and bands; ISM: molecules; ISM: structure}, language = {eng}, issn = {0035-8711}, journal = {Monthly Notices of the Royal Astronomical Society}, title = {Mapping local interstellar medium with diffuse interstellar bands}, url = {https://academic.oup.com/mnras/article-abstract/495/2/2035/5824657}, volume = {495}, year = {2020} }
TY - JOUR ID - 1673080 AU - Piecka, Martin - Paunzen, Ernst PY - 2020 TI - Mapping local interstellar medium with diffuse interstellar bands JF - Monthly Notices of the Royal Astronomical Society VL - 495 IS - 2 SP - 2035-2052 EP - 2035-2052 PB - WILEY SN - 00358711 KW - dust extinction KW - ISM: lines and bands KW - ISM: molecules KW - ISM: structure UR - https://academic.oup.com/mnras/article-abstract/495/2/2035/5824657 L2 - https://academic.oup.com/mnras/article-abstract/495/2/2035/5824657 N2 - With the use of the data from archives, we studied the correlations between the equivalent widths of four diffuse interstellar bands (4430, 5780, 5797, 6284 A) and properties of the target stars (colour excess values, distances, and Galactic coordinates). Many different plots of the diffuse interstellar bands and their maps were produced and further analysed. There appears to be a structure in the plot of equivalent widths of 5780 angstrom DIB (and 6284 angstrom DIB) against the Galactic x-coordinate. The structure is well defined below similar to 150 m angstrom and within vertical bar x vertical bar < 250 pc, peaking around x = 170 pc. We argue that the origin of this structure is not a statistical fluctuation. Splitting the data in the Galactic longitude into several subregions improve or lower the well-known linear relation between the equivalent widths and the colour excess, which was expected. However, some of the lines of sight display drastically different behaviour. The region within 150 degrees < l < 200 degrees shows scatter in the correlation plots with the colour excess for all of the four bands with correlation coefficients R < 0.58. We suspect that the variation of physical conditions in the nearby molecular clouds could be responsible. Finally, the area 250 degrees < l < 300 degrees displays (from the statistical point of view) significantly lower values of equivalent widths than the other regions - this tells us that there is either a significant underabundance of carriers (when compared with the other regions) or that this has to be a result of an observational bias. ER -
PIECKA, Martin and Ernst PAUNZEN. Mapping local interstellar medium with diffuse interstellar bands. \textit{Monthly Notices of the Royal Astronomical Society}. MALDEN: WILEY, 2020, vol.~495, No~2, p.~2035-2052. ISSN~0035-8711. Available from: https://dx.doi.org/10.1093/mnras/staa1112.
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