Distribution and Evolution of Interstellar Dust

A special issue of Universe (ISSN 2218-1997). This special issue belongs to the section "Solar and Stellar Physics".

Deadline for manuscript submissions: closed (30 November 2023) | Viewed by 1610

Special Issue Editor


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Guest Editor
South-Western Institute for Astronomy Research, Yunnan University, Kunming 650500, China
Interests: three-dimensional extinction maps; dust; ISM; structure of the milky way; pulsators; photometric/spectroscopic surveys

Special Issue Information

Dear Colleagues,

The extinction and reddening caused by interstellar dust grains pose a serious obstacle for the study of the structure and stellar populations of the Milky Way galaxy. In order to obtain the intrinsic luminosities or colors of the observed objects, it is necessary to correct for the dust extinction and reddening. For this purpose, we need to know the distribution of the dust. On the other hand, based on the knowledge of the dust distribution, we are able to further explore the properties as well as the structure of the interstellar dust of the Milky Way.

Over the last few decades, based on data from large-scale astrometric, photometric and spectroscopic surveys, we are able to obtain the extinction and distance values of hundreds of millions of individual stars, which has allowed us to make great progress in the study of the distribution of interstellar dust. This Special Issue will focus on the latest work on interstellar dust distribution, including but not limited to the measurement of stellar extinction or reddening values, the construction of 3D extinction maps, the dust structure in the Milky Way and other galaxies, the relationship between dust and gas, the molecular clouds traced by interstellar dust, etc.

Dr. Bingqiu Chen
Guest Editor

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Keywords

  • dust
  • extinction
  • galaxy structure
  • ISM structure

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Published Papers (1 paper)

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Research

16 pages, 2963 KiB  
Article
The Infrared Extinction Law in the Ophiuchus Molecular Cloud Based on the UKIDSS and Spitzer c2d Surveys
by Jun Li and Xi Chen
Universe 2023, 9(8), 364; https://doi.org/10.3390/universe9080364 - 4 Aug 2023
Cited by 3 | Viewed by 1131
Abstract
Investigating the extinction properties in dense molecular clouds is of significant importance for understanding the behavior of interstellar dust and its impact on observations. In this study, we comprehensively examined the extinction law in the Ophiuchus cloud across a wavelength range from 0.8 [...] Read more.
Investigating the extinction properties in dense molecular clouds is of significant importance for understanding the behavior of interstellar dust and its impact on observations. In this study, we comprehensively examined the extinction law in the Ophiuchus cloud across a wavelength range from 0.8 μm to 8 μm. To achieve this, we analyzed NIR and MIR data obtained from the UKIDSS GCS and the Spitzer c2d survey, respectively. By fitting a series of color–color diagrams, we determined color-excess ratios EJλ/EJK for seven passbands. These ratios were then directly converted to derive the relative extinction law Aλ/AK. Our findings demonstrate that the Ophiuchus cloud exhibits a characteristic of flat MIR extinction, consistent with previous studies. Additionally, our results reveal variations in the extinction law with extinction depth, indicating a flatter trend from the NIR to MIR bands as extinction increases. Notably, our analysis reveals no significant difference in the MIR extinction law among the four dark clouds: L1712, L1689, L1709, and L1688. However, distinct variations were observed in the extinction law for regions outside the dark clouds, specifically L1688N and L1688W. These regions displayed lower color-excess ratios EJλ/EJK in the Spitzer/IRAC bands. This observation lends support to the dust growth occurring in the dense regions of the Ophiuchus cloud. Full article
(This article belongs to the Special Issue Distribution and Evolution of Interstellar Dust)
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