A Catalog of Stellar and Dust Properties for 500,000 Stars in the Southwest Bar of the Small Magellanic Cloud
We present a catalog of individual stellar and dust extinction properties along close to 500,000 sight lines in the southwest bar of the Small Magellanic Cloud (SMC). The catalog is based on multiband Hubble Space Telescope photometric data spanning near-ultraviolet to near-infrared wavelengths from...
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IOP Publishing
2025-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/ad8eb7 |
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| author | Petia Yanchulova Merica-Jones Karl Gordon Karin Sandstrom Claire E. Murray L. Clifton Johnson Julianne J. Dalcanton Julia Roman-Duval Jeremy Chastenet Benjamin F. Williams Daniel R. Weisz Andrew E. Dolphin |
| author_facet | Petia Yanchulova Merica-Jones Karl Gordon Karin Sandstrom Claire E. Murray L. Clifton Johnson Julianne J. Dalcanton Julia Roman-Duval Jeremy Chastenet Benjamin F. Williams Daniel R. Weisz Andrew E. Dolphin |
| author_sort | Petia Yanchulova Merica-Jones |
| collection | DOAJ |
| description | We present a catalog of individual stellar and dust extinction properties along close to 500,000 sight lines in the southwest bar of the Small Magellanic Cloud (SMC). The catalog is based on multiband Hubble Space Telescope photometric data spanning near-ultraviolet to near-infrared wavelengths from the Small Magellanic Cloud Investigation of Dust and Gas Evolution survey (SMIDGE) covering a 100 × 200 pc area. We use the probabilistic technique of the Bayesian Extinction And Stellar Tool (BEAST) to model the spectral energy distributions of individual stars in SMIDGE and include the effects of observational uncertainties in the data. We compare BEAST-derived dust extinction properties with tracers of the interstellar medium, such as the emission from the ^12 CO (2–1) transition ( I (CO)), the dust mass surface density (Σ _dust ) from far-IR emission, the H i column density ( N (H i )) from the 21 cm transition, and the mass fraction of polycyclic aromatic hydrocarbons (PAHs; q _PAH , derived from IR emission). We find that the dust extinction ( A ( V )) in the SMIDGE field is strongly correlated with Σ _dust and I (CO), and less so with N (H i ) and q _PAH , and suggest potential explanations. Our extinction measurements are also sensitive to the presence of the 2175 Å bump in the extinction curve toward UV bright stars. While most do not show evidence for the bump, we identify ∼200 lines of sight that are 2175 Å bump candidates. Furthermore, we find distinct structures in the dust extinction–distance distributions that provide insights into the 3D geometry of the SMC. |
| format | Article |
| id | doaj-art-8b662ccba6c74a878ea51277d865a23b |
| institution | Kabale University |
| issn | 1538-4357 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj-art-8b662ccba6c74a878ea51277d865a23b2025-01-07T06:49:04ZengIOP PublishingThe Astrophysical Journal1538-43572025-01-01978214410.3847/1538-4357/ad8eb7A Catalog of Stellar and Dust Properties for 500,000 Stars in the Southwest Bar of the Small Magellanic CloudPetia Yanchulova Merica-Jones0https://orcid.org/0000-0002-9912-6046Karl Gordon1https://orcid.org/0000-0001-5340-6774Karin Sandstrom2https://orcid.org/0000-0002-4378-8534Claire E. Murray3https://orcid.org/0000-0002-7743-8129L. Clifton Johnson4https://orcid.org/0000-0001-6421-0953Julianne J. Dalcanton5https://orcid.org/0000-0002-1264-2006Julia Roman-Duval6https://orcid.org/0000-0001-6326-7069Jeremy Chastenet7https://orcid.org/0000-0002-5235-5589Benjamin F. Williams8https://orcid.org/0000-0002-7502-0597Daniel R. Weisz9https://orcid.org/0000-0002-6442-6030Andrew E. Dolphin10https://orcid.org/0000-0001-8416-4093Space Telescope Science Institute , 3700 San Martin Drive, Baltimore, MD 21218, USASpace Telescope Science Institute , 3700 San Martin Drive, Baltimore, MD 21218, USA; Sterrenkundig Observatorium, Universiteit Gent , Gent, BelgiumDepartment of Astronomy & Astrophysics, University of California San Diego , 9500 Gilman Drive, La Jolla, San Diego, CA 92093, USASpace Telescope Science Institute , 3700 San Martin Drive, Baltimore, MD 21218, USA; Department of Physics & Astronomy, Johns Hopkins University , 3400 N. Charles Street, Baltimore, MD 21218, USACenter for Interdisciplinary Exploration and Research in Astrophysics (CIERA) and Department of Physics and Astronomy, Northwestern University , 1800 Sherman Avenue, Evanston, IL 60201, USAAstronomy Department, University of Washington , Seattle, WA 98195, USA; Center for Computational Astrophysics, Flatiron Institute , 162 Fifth Avenue, New York, NY 10010, USASpace Telescope Science Institute , 3700 San Martin Drive, Baltimore, MD 21218, USASterrenkundig Observatorium, Universiteit Gent , Gent, BelgiumAstronomy Department, University of Washington , Seattle, WA 98195, USADepartment of Astronomy, University of California , 501 Campbell Hall #3411, Berkeley, CA 94720-3411, USARaytheon; 1151 E. Hermans Road, Tucson, AZ 85756, USA; Steward Observatory, University of Arizona , 933 N. Cherry Avenue, Tucson, AZ 85719, USAWe present a catalog of individual stellar and dust extinction properties along close to 500,000 sight lines in the southwest bar of the Small Magellanic Cloud (SMC). The catalog is based on multiband Hubble Space Telescope photometric data spanning near-ultraviolet to near-infrared wavelengths from the Small Magellanic Cloud Investigation of Dust and Gas Evolution survey (SMIDGE) covering a 100 × 200 pc area. We use the probabilistic technique of the Bayesian Extinction And Stellar Tool (BEAST) to model the spectral energy distributions of individual stars in SMIDGE and include the effects of observational uncertainties in the data. We compare BEAST-derived dust extinction properties with tracers of the interstellar medium, such as the emission from the ^12 CO (2–1) transition ( I (CO)), the dust mass surface density (Σ _dust ) from far-IR emission, the H i column density ( N (H i )) from the 21 cm transition, and the mass fraction of polycyclic aromatic hydrocarbons (PAHs; q _PAH , derived from IR emission). We find that the dust extinction ( A ( V )) in the SMIDGE field is strongly correlated with Σ _dust and I (CO), and less so with N (H i ) and q _PAH , and suggest potential explanations. Our extinction measurements are also sensitive to the presence of the 2175 Å bump in the extinction curve toward UV bright stars. While most do not show evidence for the bump, we identify ∼200 lines of sight that are 2175 Å bump candidates. Furthermore, we find distinct structures in the dust extinction–distance distributions that provide insights into the 3D geometry of the SMC.https://doi.org/10.3847/1538-4357/ad8eb7Interstellar dustInterstellar dust extinctionInterstellar mediumSmall Magellanic CloudHertzsprung Russell diagramMagellanic Clouds |
| spellingShingle | Petia Yanchulova Merica-Jones Karl Gordon Karin Sandstrom Claire E. Murray L. Clifton Johnson Julianne J. Dalcanton Julia Roman-Duval Jeremy Chastenet Benjamin F. Williams Daniel R. Weisz Andrew E. Dolphin A Catalog of Stellar and Dust Properties for 500,000 Stars in the Southwest Bar of the Small Magellanic Cloud The Astrophysical Journal Interstellar dust Interstellar dust extinction Interstellar medium Small Magellanic Cloud Hertzsprung Russell diagram Magellanic Clouds |
| title | A Catalog of Stellar and Dust Properties for 500,000 Stars in the Southwest Bar of the Small Magellanic Cloud |
| title_full | A Catalog of Stellar and Dust Properties for 500,000 Stars in the Southwest Bar of the Small Magellanic Cloud |
| title_fullStr | A Catalog of Stellar and Dust Properties for 500,000 Stars in the Southwest Bar of the Small Magellanic Cloud |
| title_full_unstemmed | A Catalog of Stellar and Dust Properties for 500,000 Stars in the Southwest Bar of the Small Magellanic Cloud |
| title_short | A Catalog of Stellar and Dust Properties for 500,000 Stars in the Southwest Bar of the Small Magellanic Cloud |
| title_sort | catalog of stellar and dust properties for 500 000 stars in the southwest bar of the small magellanic cloud |
| topic | Interstellar dust Interstellar dust extinction Interstellar medium Small Magellanic Cloud Hertzsprung Russell diagram Magellanic Clouds |
| url | https://doi.org/10.3847/1538-4357/ad8eb7 |
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