Mapping local interstellar medium with diffuse interstellar
bands

J 2020

Mapping local interstellar medium with diffuse interstellar bands

PIECKA, Martin and Ernst PAUNZEN

Basic information

Original name

Mapping local interstellar medium with diffuse interstellar bands

Authors

PIECKA, Martin (703 Slovakia, belonging to the institution) and Ernst PAUNZEN (40 Austria, guarantor, belonging to the institution)

Edition

Monthly Notices of the Royal Astronomical Society, MALDEN, WILEY, 2020, 0035-8711

Other information

Language

English

Type of outcome

Article in a journal

Field of Study

10308 Astronomy

Country of publisher

United Kingdom of Great Britain and Northern Ireland

Confidentiality degree

is not subject to a state or trade secret

References:

URL

Impact factor

Impact factor: 5.287

RIV identification code

RIV/00216224:14310/20:00116123

Organization unit

Faculty of Science

DOI

https://doi.org/10.1093/mnras/staa1112

UT WoS

000543015800036

EID Scopus

2-s2.0-85096991319

Keywords in English

dust extinction; ISM: lines and bands; ISM: molecules; ISM: structure

Abstract

In the original language

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.

Cite

PIECKA, Martin and Ernst PAUNZEN. Mapping local interstellar medium with diffuse interstellar bands. Monthly Notices of the Royal Astronomical Society. MALDEN: WILEY, 2020, vol. 495, No 2, p. 2035-2052. ISSN 0035-8711. Available from: https://doi.org/10.1093/mnras/staa1112.

@article{1673080,
   author = {Piecka, Martin and Paunzen, Ernst},
   article_location = {MALDEN},
   article_number = {2},
   doi = {https://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://doi.org/10.1093/mnras/staa1112.

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