GA-NIFS & EIGER: A merging quasar host at z=7 with an overmassive black hole
| Autor: | Marshall, Madeline A., Yue, Minghao, Eilers, Anna-Christina, Scholtz, Jan, Perna, Michele, Willott, Chris J., Maiolino, Roberto, Übler, Hannah, Arribas, Santiago, Bunker, Andrew J., Charlot, Stephane, Del Pino, Bruno Rodríguez, Böker, Torsten, Carniani, Stefano, Cresci, Giovanni, D'Eugenio, Francesco, Jones, Gareth C., Venturi, Giacomo, Bordoloi, Rongmon, Kashino, Daichi, Mackenzie, Ruari, Matthee, Jorryt, Naidu, Rohan, Simcoe, Robert A. |
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| Rok vydání: | 2024 |
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| Druh dokumentu: | Working Paper |
| Popis: | The James Webb Space Telescope is revolutionising our ability to understand the host galaxies and local environments of high-z quasars. Here we obtain a comprehensive understanding of the host galaxy of the z=7.08 quasar J1120+0641 by combining NIRSpec integral field spectroscopy with NIRCam photometry of the host continuum emission. Our emission line maps reveal that this quasar host is undergoing a merger with a bright companion galaxy. The quasar host and the companion have similar dynamical masses of $\sim10^{10}M_\odot$, suggesting that this is a major galaxy interaction. Through detailed quasar subtraction and SED fitting using the NIRCam data, we obtain an estimate of the host stellar mass of $M_{\ast}\simeq2.6\times10^9M_\odot$, with $M_{*}\simeq5.0\times10^9M_\odot$ for the companion galaxy. Using the H$\beta$ Balmer line we estimate a virial black hole mass of $M_{\rm{BH}}\simeq1.4\times10^9 M_\odot$. Thus, J1120+0641 has an extreme black hole - stellar mass ratio of $M_{\rm{BH}}/M_\ast\simeq0.54$, which is ~3 dex larger than expected by the local scaling relations between black hole and stellar mass. J1120+0641 is powered by an overmassive black hole with the highest reported black hole - stellar mass ratio, in a quasar host that is currently undergoing a major merger -- these new insights highlight the power of JWST for measuring and understanding these extreme first quasars. Comment: Submitted to A&A, comments welcome |
| Databáze: | arXiv |
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