JWST's PEARLS: A z=6 quasar in a train-wreck galaxy merger system
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2025
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| author | Marshall, Madeline A. Windhorst, Rogier A. Ferrami, Giovanni Willner, S. P. Polletta, Maria Keel, William C. Fazio, Giovanni G. Cohen, Seth H. Carleton, Timothy Jansen, Rolf A. Honor, Rachel Ortiz III, Rafael Summers, Jake D'Silva, Jordan C. J. Koekemoer, Anton M. Coe, Dan Conselice, Christopher J. Diego, Jose M. Driver, Simon P. Frye, Brenda Grogin, Norman A. Pirzkal, Nor Robotham, Aaron Ryan, Jr., Russell E. Willmer, Christopher N. A. Yan, Haojing Ricotti, Massimo Zitrin, Adi Adams, Nathan J. Cheng, Cheng Wyithe, J. Stuart B. Lim, Jeremy Perna, Michele Übler, Hannah Willott, Chris J. Jones, Gareth Scholtz, Jan Mechtley, Mira |
| author_facet | Marshall, Madeline A. Windhorst, Rogier A. Ferrami, Giovanni Willner, S. P. Polletta, Maria Keel, William C. Fazio, Giovanni G. Cohen, Seth H. Carleton, Timothy Jansen, Rolf A. Honor, Rachel Ortiz III, Rafael Summers, Jake D'Silva, Jordan C. J. Koekemoer, Anton M. Coe, Dan Conselice, Christopher J. Diego, Jose M. Driver, Simon P. Frye, Brenda Grogin, Norman A. Pirzkal, Nor Robotham, Aaron Ryan, Jr., Russell E. Willmer, Christopher N. A. Yan, Haojing Ricotti, Massimo Zitrin, Adi Adams, Nathan J. Cheng, Cheng Wyithe, J. Stuart B. Lim, Jeremy Perna, Michele Übler, Hannah Willott, Chris J. Jones, Gareth Scholtz, Jan Mechtley, Mira |
| contents | We present JWST NIRSpec integral field spectroscopy observations of the z=5.89 quasar NDWFS J1425+3254 from 0.6-5.3 microns, covering the rest-frame ultraviolet and optical at a spectral resolution of R~100. The quasar has a black hole mass of $M_{\rm{BH}}=(1.4\substack{+3.1\\-1.0})\times10^9 M_\odot$ and an Eddington ratio of $L_{\rm{Bol}}/L_{\rm{Edd}}=0.3\substack{+0.6\\-0.2}$, as implied from the broad Balmer H$α$ and H$β$ lines. The quasar host has significant ongoing obscured star formation, as well as a quasar-driven outflow with velocity $6050\substack{+460\\-630}$ km/s and ionised outflow rate of $1650\substack{+130\\-1230}M_\odot$yr$^{-1}$. This is possibly one of the most extreme outflows in the early Universe. The data also reveal that two companion galaxies are merging with the quasar host. The north-eastern companion galaxy is relatively old and very massive, with a luminosity-weighted stellar age of $65\substack{+9\\-4}$ Myr, stellar mass of $(3.6\substack{+0.6\\-0.3})\times10^{11} M_\odot$, and star-formation rate (SFR) of ~15-30 $M_\odot$yr$^{-1}$. A bridge of gas connects this companion galaxy and the host, confirming their ongoing interaction. A second merger is occurring between the quasar host and a much younger companion galaxy to the south, with a stellar age of $6.7\pm1.8$ Myr, stellar mass of $(1.9\pm0.4)\times10^{10} M_\odot$, and SFR of ~40-65 $M_\odot$yr$^{-1}$. There is also another galaxy in the field, likely in the foreground at z=1.135, which could be gravitationally lensing the quasar with magnification $1<μ<2$, and, thus, <0.75 mag. Overall, the system is a 'train-wreck' merger of three galaxies, with star formation and extreme quasar activity that were likely triggered by these ongoing interactions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_20550 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | JWST's PEARLS: A z=6 quasar in a train-wreck galaxy merger system Marshall, Madeline A. Windhorst, Rogier A. Ferrami, Giovanni Willner, S. P. Polletta, Maria Keel, William C. Fazio, Giovanni G. Cohen, Seth H. Carleton, Timothy Jansen, Rolf A. Honor, Rachel Ortiz III, Rafael Summers, Jake D'Silva, Jordan C. J. Koekemoer, Anton M. Coe, Dan Conselice, Christopher J. Diego, Jose M. Driver, Simon P. Frye, Brenda Grogin, Norman A. Pirzkal, Nor Robotham, Aaron Ryan, Jr., Russell E. Willmer, Christopher N. A. Yan, Haojing Ricotti, Massimo Zitrin, Adi Adams, Nathan J. Cheng, Cheng Wyithe, J. Stuart B. Lim, Jeremy Perna, Michele Übler, Hannah Willott, Chris J. Jones, Gareth Scholtz, Jan Mechtley, Mira Astrophysics of Galaxies We present JWST NIRSpec integral field spectroscopy observations of the z=5.89 quasar NDWFS J1425+3254 from 0.6-5.3 microns, covering the rest-frame ultraviolet and optical at a spectral resolution of R~100. The quasar has a black hole mass of $M_{\rm{BH}}=(1.4\substack{+3.1\\-1.0})\times10^9 M_\odot$ and an Eddington ratio of $L_{\rm{Bol}}/L_{\rm{Edd}}=0.3\substack{+0.6\\-0.2}$, as implied from the broad Balmer H$α$ and H$β$ lines. The quasar host has significant ongoing obscured star formation, as well as a quasar-driven outflow with velocity $6050\substack{+460\\-630}$ km/s and ionised outflow rate of $1650\substack{+130\\-1230}M_\odot$yr$^{-1}$. This is possibly one of the most extreme outflows in the early Universe. The data also reveal that two companion galaxies are merging with the quasar host. The north-eastern companion galaxy is relatively old and very massive, with a luminosity-weighted stellar age of $65\substack{+9\\-4}$ Myr, stellar mass of $(3.6\substack{+0.6\\-0.3})\times10^{11} M_\odot$, and star-formation rate (SFR) of ~15-30 $M_\odot$yr$^{-1}$. A bridge of gas connects this companion galaxy and the host, confirming their ongoing interaction. A second merger is occurring between the quasar host and a much younger companion galaxy to the south, with a stellar age of $6.7\pm1.8$ Myr, stellar mass of $(1.9\pm0.4)\times10^{10} M_\odot$, and SFR of ~40-65 $M_\odot$yr$^{-1}$. There is also another galaxy in the field, likely in the foreground at z=1.135, which could be gravitationally lensing the quasar with magnification $1<μ<2$, and, thus, <0.75 mag. Overall, the system is a 'train-wreck' merger of three galaxies, with star formation and extreme quasar activity that were likely triggered by these ongoing interactions. |
| title | JWST's PEARLS: A z=6 quasar in a train-wreck galaxy merger system |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2502.20550 |