PEARLS: Discovery of Point-Source Features Within Galaxies in the North Ecliptic Pole Time Domain Field
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2024
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| author | Ortiz III, Rafael Windhorst, Rogier A. Cohen, Seth H. Willner, S. P. Jansen, Rolf A. Carleton, Timothy Kamieneski, Patrick S. Rutkowski, Michael J. Smith, Brent Summers, Jake McCabe, Tyler J. O'Brien, Rosalia Diego, Jose M. Yun, Min S. D'Silva, Jordan C. J. Li, Juno Gim, Hansung B. Hathi, Nimish P. Holwerda, Benne W. Zitrin, Adi Cheng, Cheng McLeod, Noah J. Conselice, Christopher J. Driver, Simon P. Yan, Haojing Coe, Dan Frye, Brenda Grogin, Norman Koekemoer, Anton Marshall, Madeline A. Pirzkal, Nor Robotham, Aaron Ryan, Jr., Russell E. Willmer, Christopher N. A. Keel, William Hammel, H. B. Hyun, M. Im, M. Milam, S. N. |
| author_facet | Ortiz III, Rafael Windhorst, Rogier A. Cohen, Seth H. Willner, S. P. Jansen, Rolf A. Carleton, Timothy Kamieneski, Patrick S. Rutkowski, Michael J. Smith, Brent Summers, Jake McCabe, Tyler J. O'Brien, Rosalia Diego, Jose M. Yun, Min S. D'Silva, Jordan C. J. Li, Juno Gim, Hansung B. Hathi, Nimish P. Holwerda, Benne W. Zitrin, Adi Cheng, Cheng McLeod, Noah J. Conselice, Christopher J. Driver, Simon P. Yan, Haojing Coe, Dan Frye, Brenda Grogin, Norman Koekemoer, Anton Marshall, Madeline A. Pirzkal, Nor Robotham, Aaron Ryan, Jr., Russell E. Willmer, Christopher N. A. Keel, William Hammel, H. B. Hyun, M. Im, M. Milam, S. N. |
| contents | The first public 0.9-4.4μm NIRCam images of the North Ecliptic Pole (NEP) Time Domain Field (TDF) uncovered galaxies displaying point-source features in their cores as seen in the longer wavelength filters. We visually identified a sample of 66 galaxies (~1 galaxy per arcmin2) with point-like cores and have modeled their two-dimensional light profiles with GalFit, identifying 16 galactic nuclei with measurable point-source components. GalFit suggests the visual sample is a mix of both compact stellar bulge and point-source galaxy cores. This core classification is complemented by spectral energy distribution (SED) modeling to infer the sample's active galactic nucleus (AGN) and host-galaxy parameters. For galaxies with measurable point-source components, the median fractional AGN contribution to their 0.1-30.0μm flux is 0.44, and 14/16 are color-classified AGN. We conclude that near-infrared point-source galaxy cores are signatures of AGN. In addition, we define an automated sample-selection criterion to identify these point-source features. These criteria can be used in other extant and future NIRCam images to streamline the search for galaxies with unresolved IR-luminous AGN. The James Webb Space Telescope's superb angular resolution and sensitivity at infrared wavelengths is resurrecting the morphological identification of AGN. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_10709 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | PEARLS: Discovery of Point-Source Features Within Galaxies in the North Ecliptic Pole Time Domain Field Ortiz III, Rafael Windhorst, Rogier A. Cohen, Seth H. Willner, S. P. Jansen, Rolf A. Carleton, Timothy Kamieneski, Patrick S. Rutkowski, Michael J. Smith, Brent Summers, Jake McCabe, Tyler J. O'Brien, Rosalia Diego, Jose M. Yun, Min S. D'Silva, Jordan C. J. Li, Juno Gim, Hansung B. Hathi, Nimish P. Holwerda, Benne W. Zitrin, Adi Cheng, Cheng McLeod, Noah J. Conselice, Christopher J. Driver, Simon P. Yan, Haojing Coe, Dan Frye, Brenda Grogin, Norman Koekemoer, Anton Marshall, Madeline A. Pirzkal, Nor Robotham, Aaron Ryan, Jr., Russell E. Willmer, Christopher N. A. Keel, William Hammel, H. B. Hyun, M. Im, M. Milam, S. N. Astrophysics of Galaxies The first public 0.9-4.4μm NIRCam images of the North Ecliptic Pole (NEP) Time Domain Field (TDF) uncovered galaxies displaying point-source features in their cores as seen in the longer wavelength filters. We visually identified a sample of 66 galaxies (~1 galaxy per arcmin2) with point-like cores and have modeled their two-dimensional light profiles with GalFit, identifying 16 galactic nuclei with measurable point-source components. GalFit suggests the visual sample is a mix of both compact stellar bulge and point-source galaxy cores. This core classification is complemented by spectral energy distribution (SED) modeling to infer the sample's active galactic nucleus (AGN) and host-galaxy parameters. For galaxies with measurable point-source components, the median fractional AGN contribution to their 0.1-30.0μm flux is 0.44, and 14/16 are color-classified AGN. We conclude that near-infrared point-source galaxy cores are signatures of AGN. In addition, we define an automated sample-selection criterion to identify these point-source features. These criteria can be used in other extant and future NIRCam images to streamline the search for galaxies with unresolved IR-luminous AGN. The James Webb Space Telescope's superb angular resolution and sensitivity at infrared wavelengths is resurrecting the morphological identification of AGN. |
| title | PEARLS: Discovery of Point-Source Features Within Galaxies in the North Ecliptic Pole Time Domain Field |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2404.10709 |