Exploring the Wolf Approach to Constraining NIR Extinction Laws in the Corona Australis Molecular Cloud
The viability of the star count (Wolf) method is assessed as a means of constraining the near-infrared (NIR) extinction law toward the Corona Australis molecular cloud. Using deep JHK _S photometry from the VISIONS survey, extinction maps with 1′ spatial resolution are constructed. The derived extin...
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IOP Publishing
2025-01-01
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| Online Access: | https://doi.org/10.3847/1538-3881/adea6f |
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| author | Botao Jiang Jun Li Xi Chen |
| author_facet | Botao Jiang Jun Li Xi Chen |
| author_sort | Botao Jiang |
| collection | DOAJ |
| description | The viability of the star count (Wolf) method is assessed as a means of constraining the near-infrared (NIR) extinction law toward the Corona Australis molecular cloud. Using deep JHK _S photometry from the VISIONS survey, extinction maps with 1′ spatial resolution are constructed. The derived extinction ratios are A _J / A _H = 1.73 ± 0.07, ${A}_{H}/{A}_{{K}_{S}}=1.70\pm 0.11$ , and ${A}_{J}/{A}_{{K}_{S}}=3.02\pm 0.22$ , which are consistent with Galactic literature means. Assuming a power-law form ( A _λ ∝ λ ^− ^α ) for the NIR extinction law, we derive indices of α ≈ 2.0 across all wavelength combinations, with no statistically significant wavelength dependence throughout the NIR wavelength range. While spatial variations in extinction properties are tentatively observed across the cloud, concerns persist regarding the impact of photometric completeness, and the role of reference field selection. Continued research is required to refine the approach, and scrutinize the veracity of potential extinction law variations over a more expansive region of sky. |
| format | Article |
| id | doaj-art-59566e421e8b4b338fc7810d59602802 |
| institution | DOAJ |
| issn | 1538-3881 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astronomical Journal |
| spelling | doaj-art-59566e421e8b4b338fc7810d596028022025-08-20T03:09:16ZengIOP PublishingThe Astronomical Journal1538-38812025-01-01170211810.3847/1538-3881/adea6fExploring the Wolf Approach to Constraining NIR Extinction Laws in the Corona Australis Molecular CloudBotao Jiang0https://orcid.org/0009-0007-2880-849XJun Li1https://orcid.org/0000-0001-9328-4302Xi Chen2https://orcid.org/0000-0002-5435-925XCenter for Astrophysics, Guangzhou University , Guangzhou 510006, People’s Republic of China ; lijun@gzhu.edu.cn, chenxi@gzhu.edu.cnCenter for Astrophysics, Guangzhou University , Guangzhou 510006, People’s Republic of China ; lijun@gzhu.edu.cn, chenxi@gzhu.edu.cnCenter for Astrophysics, Guangzhou University , Guangzhou 510006, People’s Republic of China ; lijun@gzhu.edu.cn, chenxi@gzhu.edu.cnThe viability of the star count (Wolf) method is assessed as a means of constraining the near-infrared (NIR) extinction law toward the Corona Australis molecular cloud. Using deep JHK _S photometry from the VISIONS survey, extinction maps with 1′ spatial resolution are constructed. The derived extinction ratios are A _J / A _H = 1.73 ± 0.07, ${A}_{H}/{A}_{{K}_{S}}=1.70\pm 0.11$ , and ${A}_{J}/{A}_{{K}_{S}}=3.02\pm 0.22$ , which are consistent with Galactic literature means. Assuming a power-law form ( A _λ ∝ λ ^− ^α ) for the NIR extinction law, we derive indices of α ≈ 2.0 across all wavelength combinations, with no statistically significant wavelength dependence throughout the NIR wavelength range. While spatial variations in extinction properties are tentatively observed across the cloud, concerns persist regarding the impact of photometric completeness, and the role of reference field selection. Continued research is required to refine the approach, and scrutinize the veracity of potential extinction law variations over a more expansive region of sky.https://doi.org/10.3847/1538-3881/adea6fReddening lawInterstellar extinctionInterstellar dustDense interstellar clouds |
| spellingShingle | Botao Jiang Jun Li Xi Chen Exploring the Wolf Approach to Constraining NIR Extinction Laws in the Corona Australis Molecular Cloud The Astronomical Journal Reddening law Interstellar extinction Interstellar dust Dense interstellar clouds |
| title | Exploring the Wolf Approach to Constraining NIR Extinction Laws in the Corona Australis Molecular Cloud |
| title_full | Exploring the Wolf Approach to Constraining NIR Extinction Laws in the Corona Australis Molecular Cloud |
| title_fullStr | Exploring the Wolf Approach to Constraining NIR Extinction Laws in the Corona Australis Molecular Cloud |
| title_full_unstemmed | Exploring the Wolf Approach to Constraining NIR Extinction Laws in the Corona Australis Molecular Cloud |
| title_short | Exploring the Wolf Approach to Constraining NIR Extinction Laws in the Corona Australis Molecular Cloud |
| title_sort | exploring the wolf approach to constraining nir extinction laws in the corona australis molecular cloud |
| topic | Reddening law Interstellar extinction Interstellar dust Dense interstellar clouds |
| url | https://doi.org/10.3847/1538-3881/adea6f |
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