Halfway to the Peak: Ice Absorption Bands at z ≈ 0.5 with JWST MIRI/MRS
This paper presents the first combined detections of CO _2 , CO, XCN, and water ices beyond the local Universe. We find gas-phase CO in addition to the solid phase CO. Our source, SSTXFLS J172458.3+591545, is a z = 0.494 star-forming galaxy that also hosts a deeply obscured AGN. The profiles of its...
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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/adc44a |
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| author | Anna Sajina Alexandra Pope Henrik Spoon Lee Armus Miriam Eleazer Duncan Farrah Mark Lacy Thomas Lai Jed McKinney Sylvain Veilleux Lin Yan Jason Young |
| author_facet | Anna Sajina Alexandra Pope Henrik Spoon Lee Armus Miriam Eleazer Duncan Farrah Mark Lacy Thomas Lai Jed McKinney Sylvain Veilleux Lin Yan Jason Young |
| author_sort | Anna Sajina |
| collection | DOAJ |
| description | This paper presents the first combined detections of CO _2 , CO, XCN, and water ices beyond the local Universe. We find gas-phase CO in addition to the solid phase CO. Our source, SSTXFLS J172458.3+591545, is a z = 0.494 star-forming galaxy that also hosts a deeply obscured AGN. The profiles of its ice features are consistent with those of other Galactic and local galaxy sources, and the implied ice mantle composition is similar to that of even more obscured sources. The ice features indicate the presence of a compact nucleus in our Galaxy and allow us to place constraints on its density and temperature ( n > 10 ^5 cm ^−3 and T = 20–90 K). We infer the visual extinction towards this nucleus to be A _V ≈ 6–7. An observed plot of τ _Si versus τ _CO2 / τ _Si can be viewed as a probe for both the total dustiness of a system as well as the clumpiness of the dust along the line of sight. This paper highlights the potential of using JWST MIRI spectra to study the dust composition and geometric distribution of sources beyond the local Universe. |
| format | Article |
| id | doaj-art-7524f67645d34041a604d2bf62d54c79 |
| institution | OA Journals |
| issn | 1538-4357 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj-art-7524f67645d34041a604d2bf62d54c792025-08-20T01:53:30ZengIOP PublishingThe Astrophysical Journal1538-43572025-01-01985220110.3847/1538-4357/adc44aHalfway to the Peak: Ice Absorption Bands at z ≈ 0.5 with JWST MIRI/MRSAnna Sajina0https://orcid.org/0000-0002-1917-1200Alexandra Pope1https://orcid.org/0000-0001-8592-2706Henrik Spoon2https://orcid.org/0000-0002-8712-369XLee Armus3https://orcid.org/0000-0003-3498-2973Miriam Eleazer4https://orcid.org/0000-0002-4690-4502Duncan Farrah5https://orcid.org/0000-0003-1748-2010Mark Lacy6https://orcid.org/0000-0002-3032-1783Thomas Lai7https://orcid.org/0000-0001-8490-6632Jed McKinney8https://orcid.org/0000-0002-6149-8178Sylvain Veilleux9https://orcid.org/0000-0002-3158-6820Lin Yan10https://orcid.org/0000-0003-1710-9339Jason Young11https://orcid.org/0000-0002-5830-9233Department of Physics and Astronomy, Tufts University , Medford, MA 02155, USADepartment of Astronomy , UMass Amherst, Amherst, MA 01003, USACornell University , Ithaca, NY, USACalifornia Institute of Technology , 1200 E. California Blvd., Pasadena, CA 91125, USADepartment of Astronomy , UMass Amherst, Amherst, MA 01003, USAUniversity of Hawaii , Manoa, HI, USANRAO , Charlottesville, VA, USACalifornia Institute of Technology , 1200 E. California Blvd., Pasadena, CA 91125, USAUniversity of Texas at Austin , Austin, TX, USADepartment of Astronomy and Joint Space-Science Institute, University of Maryland , College Park, MD 20742, USACalifornia Institute of Technology , 1200 E. California Blvd., Pasadena, CA 91125, USAWilliams College & SETI Institute , USAThis paper presents the first combined detections of CO _2 , CO, XCN, and water ices beyond the local Universe. We find gas-phase CO in addition to the solid phase CO. Our source, SSTXFLS J172458.3+591545, is a z = 0.494 star-forming galaxy that also hosts a deeply obscured AGN. The profiles of its ice features are consistent with those of other Galactic and local galaxy sources, and the implied ice mantle composition is similar to that of even more obscured sources. The ice features indicate the presence of a compact nucleus in our Galaxy and allow us to place constraints on its density and temperature ( n > 10 ^5 cm ^−3 and T = 20–90 K). We infer the visual extinction towards this nucleus to be A _V ≈ 6–7. An observed plot of τ _Si versus τ _CO2 / τ _Si can be viewed as a probe for both the total dustiness of a system as well as the clumpiness of the dust along the line of sight. This paper highlights the potential of using JWST MIRI spectra to study the dust composition and geometric distribution of sources beyond the local Universe.https://doi.org/10.3847/1538-4357/adc44aActive galaxiesDust composition |
| spellingShingle | Anna Sajina Alexandra Pope Henrik Spoon Lee Armus Miriam Eleazer Duncan Farrah Mark Lacy Thomas Lai Jed McKinney Sylvain Veilleux Lin Yan Jason Young Halfway to the Peak: Ice Absorption Bands at z ≈ 0.5 with JWST MIRI/MRS The Astrophysical Journal Active galaxies Dust composition |
| title | Halfway to the Peak: Ice Absorption Bands at z ≈ 0.5 with JWST MIRI/MRS |
| title_full | Halfway to the Peak: Ice Absorption Bands at z ≈ 0.5 with JWST MIRI/MRS |
| title_fullStr | Halfway to the Peak: Ice Absorption Bands at z ≈ 0.5 with JWST MIRI/MRS |
| title_full_unstemmed | Halfway to the Peak: Ice Absorption Bands at z ≈ 0.5 with JWST MIRI/MRS |
| title_short | Halfway to the Peak: Ice Absorption Bands at z ≈ 0.5 with JWST MIRI/MRS |
| title_sort | halfway to the peak ice absorption bands at z ≈ 0 5 with jwst miri mrs |
| topic | Active galaxies Dust composition |
| url | https://doi.org/10.3847/1538-4357/adc44a |
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