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| Autores principales: | , , , , , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2026
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| Materias: | |
| Acceso en línea: | https://arxiv.org/abs/2604.13178 |
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| _version_ | 1866911594015883264 |
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| author | Mkrtchyan, T. Mazzucchelli, C. Assef, R. J. Temple, M. J. Rojas-Lilayú, A. Bauer, F. E. Toptun, V. Barroso, J. A. Acevedo Belladitta, S. Farina, E. P. Martínez-Ramírez, L. N. Papini, G. Satheesh-Sheeba, S. Stern, D. Upadhyayula, A. |
| author_facet | Mkrtchyan, T. Mazzucchelli, C. Assef, R. J. Temple, M. J. Rojas-Lilayú, A. Bauer, F. E. Toptun, V. Barroso, J. A. Acevedo Belladitta, S. Farina, E. P. Martínez-Ramírez, L. N. Papini, G. Satheesh-Sheeba, S. Stern, D. Upadhyayula, A. |
| contents | The identification of high-redshift quasars ($z > 4.5$) is critical for studying the early Universe, supermassive black hole growth, and cosmic reionization. Most known high-redshift quasars are located in the northern hemisphere, leaving the southern sky largely unexplored. As part of the 4-meter Multi-Object Spectroscopic Telescope (4MOST) and Chilean AGN/Galaxy Extragalactic Survey (ChANGES) S1604 survey, we aim to create a large catalog of high-redshift quasar candidates in the southern hemisphere using multiwavelength photometry and Spectral Energy Distribution (SED) fitting, with the goal of spectroscopic follow-up with 4MOST. We construct a multi-band photometric catalog by combining optical data from DELVE DR2 and DECaLS DR10, near-infrared data from VHS DR5 with an additional field of VIKING, mid-infrared data from AllWISE, and optical astrometry from Gaia DR3. After applying morphological and color-based cuts, we perform SED fitting using quasar and brown dwarf templates. Statistical outputs, including $χ^2$, BIC, and F-test are used to rank and select candidates. Our final catalog contains 6104 high-redshift quasar candidates within $4.5 < z < 7$, with detections in 7 or more photometric bands satisfying our SED-based selection criteria (BIC > 0 and F-test > 10). Spectroscopic validation using NTT/EFOSC2 and Palomar/NGPS confirmed 3 high-redshift quasars at $z > 5$ out of 6 observed candidates. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_13178 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | 4MOST ChANGES: Catalog of high-redshift quasar candidates (4.5 < $z$ < 7) selected with SED fitting Mkrtchyan, T. Mazzucchelli, C. Assef, R. J. Temple, M. J. Rojas-Lilayú, A. Bauer, F. E. Toptun, V. Barroso, J. A. Acevedo Belladitta, S. Farina, E. P. Martínez-Ramírez, L. N. Papini, G. Satheesh-Sheeba, S. Stern, D. Upadhyayula, A. Astrophysics of Galaxies The identification of high-redshift quasars ($z > 4.5$) is critical for studying the early Universe, supermassive black hole growth, and cosmic reionization. Most known high-redshift quasars are located in the northern hemisphere, leaving the southern sky largely unexplored. As part of the 4-meter Multi-Object Spectroscopic Telescope (4MOST) and Chilean AGN/Galaxy Extragalactic Survey (ChANGES) S1604 survey, we aim to create a large catalog of high-redshift quasar candidates in the southern hemisphere using multiwavelength photometry and Spectral Energy Distribution (SED) fitting, with the goal of spectroscopic follow-up with 4MOST. We construct a multi-band photometric catalog by combining optical data from DELVE DR2 and DECaLS DR10, near-infrared data from VHS DR5 with an additional field of VIKING, mid-infrared data from AllWISE, and optical astrometry from Gaia DR3. After applying morphological and color-based cuts, we perform SED fitting using quasar and brown dwarf templates. Statistical outputs, including $χ^2$, BIC, and F-test are used to rank and select candidates. Our final catalog contains 6104 high-redshift quasar candidates within $4.5 < z < 7$, with detections in 7 or more photometric bands satisfying our SED-based selection criteria (BIC > 0 and F-test > 10). Spectroscopic validation using NTT/EFOSC2 and Palomar/NGPS confirmed 3 high-redshift quasars at $z > 5$ out of 6 observed candidates. |
| title | 4MOST ChANGES: Catalog of high-redshift quasar candidates (4.5 < $z$ < 7) selected with SED fitting |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2604.13178 |