Lyman Continuum Leakers in the AstroSat Ultraviolet Deep Field: Extreme-ultraviolet Emitters at the Cosmic Noon
We report the direct detection of Lyman continuum (LyC) emission from nine galaxies and one active galactic nucleus at z ∼ 1.1–1.6 in the GOODS-North field using deep observations from the Ultraviolet Imaging Telescope (UVIT) on board AstroSat. The absolute escape fraction of the sources estimated f...
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| Format: | Article |
| Language: | English |
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IOP Publishing
2024-01-01
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| Series: | The Astrophysical Journal Letters |
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| Online Access: | https://doi.org/10.3847/2041-8213/ad2344 |
| _version_ | 1797294588058140672 |
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| author | Suraj Dhiwar Kanak Saha Soumil Maulick Brent M. Smith Chayan Mondal Harry I. Teplitz Marc Rafelski Rogier A. Windhorst |
| author_facet | Suraj Dhiwar Kanak Saha Soumil Maulick Brent M. Smith Chayan Mondal Harry I. Teplitz Marc Rafelski Rogier A. Windhorst |
| author_sort | Suraj Dhiwar |
| collection | DOAJ |
| description | We report the direct detection of Lyman continuum (LyC) emission from nine galaxies and one active galactic nucleus at z ∼ 1.1–1.6 in the GOODS-North field using deep observations from the Ultraviolet Imaging Telescope (UVIT) on board AstroSat. The absolute escape fraction of the sources estimated from the far-ultraviolet and H α -line luminosities using Monte Carlo analysis of two intergalactic medium models span a range ∼10%–55%. The rest-frame UV wavelength of the sources falls in the extreme-ultraviolet regime ∼550–700 Å, the shortest LyC wavelength range probed so far. This redshift range remains devoid of direct detections of LyC emission due to the instrumental limitations of previously available facilities. With UVIT having very low detector noise, each of these sources is detected with an individual signal-to-noise ratio (S/N) > 3, while for the stack of six sources, we achieve an S/N ∼ 7.4. The LyC emission is seen to be offset from the optical centroids and extended beyond the UVIT point-spread function of 1.″6 in most of the sources. This sample fills an important niche between GALEX and Cosmic Origins Spectrograph at low z and Hubble Space Telescope's Wide Field Camera 3 at high z and is crucial in understanding the evolution of LyC leakers. |
| first_indexed | 2024-03-07T21:32:26Z |
| format | Article |
| id | doaj.art-1903de82de05419387a03fc508a18c11 |
| institution | Directory Open Access Journal |
| issn | 2041-8205 |
| language | English |
| last_indexed | 2024-03-07T21:32:26Z |
| publishDate | 2024-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal Letters |
| spelling | doaj.art-1903de82de05419387a03fc508a18c112024-02-26T14:55:11ZengIOP PublishingThe Astrophysical Journal Letters2041-82052024-01-019631L2310.3847/2041-8213/ad2344Lyman Continuum Leakers in the AstroSat Ultraviolet Deep Field: Extreme-ultraviolet Emitters at the Cosmic NoonSuraj Dhiwar0https://orcid.org/0000-0001-8650-205XKanak Saha1https://orcid.org/0000-0002-8768-9298Soumil Maulick2https://orcid.org/0009-0003-8568-4850Brent M. Smith3https://orcid.org/0000-0002-0648-1699Chayan Mondal4https://orcid.org/0000-0003-4531-0945Harry I. Teplitz5https://orcid.org/0000-0002-7064-5424Marc Rafelski6https://orcid.org/0000-0002-9946-4731Rogier A. Windhorst7https://orcid.org/0000-0001-8156-6281Inter University Center for Astronomy and Astrophysics , Ganeshkhind, Pune 411007, India ; suraj@iucaa.in; Department of Physics, Savitribai Phule Pune University , Pune 411007, IndiaInter University Center for Astronomy and Astrophysics , Ganeshkhind, Pune 411007, India ; suraj@iucaa.inInter University Center for Astronomy and Astrophysics , Ganeshkhind, Pune 411007, India ; suraj@iucaa.inSchool of Earth and Space Exploration, Arizona State University , Tempe, AZ 85287-1404, USAInter University Center for Astronomy and Astrophysics , Ganeshkhind, Pune 411007, India ; suraj@iucaa.inIPAC , Mail Code 314-6, Caltech, 1200 E. California Boulevard, Pasadena, CA 91125, USASpace Telescope Science Institute , 3700 San Martin Drive, Baltimore, MD 21218, USA; Department of Physics and Astronomy, Johns Hopkins University , Baltimore, MD 21218, USASchool of Earth and Space Exploration, Arizona State University , Tempe, AZ 85287-1404, USAWe report the direct detection of Lyman continuum (LyC) emission from nine galaxies and one active galactic nucleus at z ∼ 1.1–1.6 in the GOODS-North field using deep observations from the Ultraviolet Imaging Telescope (UVIT) on board AstroSat. The absolute escape fraction of the sources estimated from the far-ultraviolet and H α -line luminosities using Monte Carlo analysis of two intergalactic medium models span a range ∼10%–55%. The rest-frame UV wavelength of the sources falls in the extreme-ultraviolet regime ∼550–700 Å, the shortest LyC wavelength range probed so far. This redshift range remains devoid of direct detections of LyC emission due to the instrumental limitations of previously available facilities. With UVIT having very low detector noise, each of these sources is detected with an individual signal-to-noise ratio (S/N) > 3, while for the stack of six sources, we achieve an S/N ∼ 7.4. The LyC emission is seen to be offset from the optical centroids and extended beyond the UVIT point-spread function of 1.″6 in most of the sources. This sample fills an important niche between GALEX and Cosmic Origins Spectrograph at low z and Hubble Space Telescope's Wide Field Camera 3 at high z and is crucial in understanding the evolution of LyC leakers.https://doi.org/10.3847/2041-8213/ad2344Emission line galaxiesReionizationUltraviolet astronomy |
| spellingShingle | Suraj Dhiwar Kanak Saha Soumil Maulick Brent M. Smith Chayan Mondal Harry I. Teplitz Marc Rafelski Rogier A. Windhorst Lyman Continuum Leakers in the AstroSat Ultraviolet Deep Field: Extreme-ultraviolet Emitters at the Cosmic Noon The Astrophysical Journal Letters Emission line galaxies Reionization Ultraviolet astronomy |
| title | Lyman Continuum Leakers in the AstroSat Ultraviolet Deep Field: Extreme-ultraviolet Emitters at the Cosmic Noon |
| title_full | Lyman Continuum Leakers in the AstroSat Ultraviolet Deep Field: Extreme-ultraviolet Emitters at the Cosmic Noon |
| title_fullStr | Lyman Continuum Leakers in the AstroSat Ultraviolet Deep Field: Extreme-ultraviolet Emitters at the Cosmic Noon |
| title_full_unstemmed | Lyman Continuum Leakers in the AstroSat Ultraviolet Deep Field: Extreme-ultraviolet Emitters at the Cosmic Noon |
| title_short | Lyman Continuum Leakers in the AstroSat Ultraviolet Deep Field: Extreme-ultraviolet Emitters at the Cosmic Noon |
| title_sort | lyman continuum leakers in the astrosat ultraviolet deep field extreme ultraviolet emitters at the cosmic noon |
| topic | Emission line galaxies Reionization Ultraviolet astronomy |
| url | https://doi.org/10.3847/2041-8213/ad2344 |
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