The first identification of Lyman $α$ Changing-look Quasars at high-redshift in DESI
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2024
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| author | Guo, Wei-Jian Pan, Zhiwei Siudek, Małgorzata Aguilar, Jessica Nicole Ahlen, Steven Bianchi, Davide Brooks, David Claybaugh, Todd Dawson, Kyle de la Macorra, Axel Doel, Peter Fanning, Kevin Forero-Romero, Jaime E. Gaztañaga, Enrique Gontcho, Satya Gontcho A Honscheid, Klaus Kehoe, Robert Kisner, Theodore Lambert, Andrew Landriau, Martin Guillou, Laurent Le Manera, Marc Meisner, Aaron Moustakas, John Muñoz-Gutiérrez, Andrea Myers, Adam Nie, Jundan Palanque-Delabrouille, Nathalie Poppett, Claire Prada, Francisco Rezaie, Mehdi Rossi, Graziano Sanchez, Eusebio Schubnelll, Michael Seo, Hee-Jong Silber, Joseph Harry Sprayberry, David Tarlé, Gregory Weaver, Benjamin Alan Zhou, Zhimin Zou, Hu |
| author_facet | Guo, Wei-Jian Pan, Zhiwei Siudek, Małgorzata Aguilar, Jessica Nicole Ahlen, Steven Bianchi, Davide Brooks, David Claybaugh, Todd Dawson, Kyle de la Macorra, Axel Doel, Peter Fanning, Kevin Forero-Romero, Jaime E. Gaztañaga, Enrique Gontcho, Satya Gontcho A Honscheid, Klaus Kehoe, Robert Kisner, Theodore Lambert, Andrew Landriau, Martin Guillou, Laurent Le Manera, Marc Meisner, Aaron Moustakas, John Muñoz-Gutiérrez, Andrea Myers, Adam Nie, Jundan Palanque-Delabrouille, Nathalie Poppett, Claire Prada, Francisco Rezaie, Mehdi Rossi, Graziano Sanchez, Eusebio Schubnelll, Michael Seo, Hee-Jong Silber, Joseph Harry Sprayberry, David Tarlé, Gregory Weaver, Benjamin Alan Zhou, Zhimin Zou, Hu |
| contents | We present two cases of Ly$α$ changing-look (CL) quasars (J1306 and J1512) along with two additional candidates (J1511 and J1602), all discovered serendipitously at $z >2$ through the Dark Energy Spectroscopic Instrument (DESI) and the Sloan Digital Sky Survey (SDSS). It is the first time to capture CL events in Ly$α$ at high redshift, which is crucial for understanding underlying mechanisms driving the CL phenomenon and the evolution of high-redshift quasars and galaxies. The variability of all four sources is confirmed by the significant change of amplitude in the $r$ band ($|r_{\rm DESI}-r_{\rm SDSS}| >0.5 \ \rm mag$). We find that the accretion rate in the dim state for these CL objects corresponds to a relatively low value ($\mathscr{\dot M} \approx 2\times10^{-3}$), which suggests that the inner region of the accretion disk might be in transition between the Advection Dominated Accretion Flow ($\mathscr{\dot M}<10^{-3}\sim 10^{-2}$) and the canonical accretion disk (optically thick, geometrically thin). However, unlike in C {\sc iv} CL quasars in which broad Ly$α$ remained, the broad C {\sc iv} may still persist after a CL event occurs in Ly$α$, making the physical origin of the CL and ionization mechanism event more puzzling and interesting. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_01949 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | The first identification of Lyman $α$ Changing-look Quasars at high-redshift in DESI Guo, Wei-Jian Pan, Zhiwei Siudek, Małgorzata Aguilar, Jessica Nicole Ahlen, Steven Bianchi, Davide Brooks, David Claybaugh, Todd Dawson, Kyle de la Macorra, Axel Doel, Peter Fanning, Kevin Forero-Romero, Jaime E. Gaztañaga, Enrique Gontcho, Satya Gontcho A Honscheid, Klaus Kehoe, Robert Kisner, Theodore Lambert, Andrew Landriau, Martin Guillou, Laurent Le Manera, Marc Meisner, Aaron Moustakas, John Muñoz-Gutiérrez, Andrea Myers, Adam Nie, Jundan Palanque-Delabrouille, Nathalie Poppett, Claire Prada, Francisco Rezaie, Mehdi Rossi, Graziano Sanchez, Eusebio Schubnelll, Michael Seo, Hee-Jong Silber, Joseph Harry Sprayberry, David Tarlé, Gregory Weaver, Benjamin Alan Zhou, Zhimin Zou, Hu Astrophysics of Galaxies We present two cases of Ly$α$ changing-look (CL) quasars (J1306 and J1512) along with two additional candidates (J1511 and J1602), all discovered serendipitously at $z >2$ through the Dark Energy Spectroscopic Instrument (DESI) and the Sloan Digital Sky Survey (SDSS). It is the first time to capture CL events in Ly$α$ at high redshift, which is crucial for understanding underlying mechanisms driving the CL phenomenon and the evolution of high-redshift quasars and galaxies. The variability of all four sources is confirmed by the significant change of amplitude in the $r$ band ($|r_{\rm DESI}-r_{\rm SDSS}| >0.5 \ \rm mag$). We find that the accretion rate in the dim state for these CL objects corresponds to a relatively low value ($\mathscr{\dot M} \approx 2\times10^{-3}$), which suggests that the inner region of the accretion disk might be in transition between the Advection Dominated Accretion Flow ($\mathscr{\dot M}<10^{-3}\sim 10^{-2}$) and the canonical accretion disk (optically thick, geometrically thin). However, unlike in C {\sc iv} CL quasars in which broad Ly$α$ remained, the broad C {\sc iv} may still persist after a CL event occurs in Ly$α$, making the physical origin of the CL and ionization mechanism event more puzzling and interesting. |
| title | The first identification of Lyman $α$ Changing-look Quasars at high-redshift in DESI |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2411.01949 |