A quasar-galaxy merger at $z\sim6.2$: black hole mass and quasar properties from the NIRSpec spectrum
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2024
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| author | Loiacono, Federica Decarli, Roberto Mignoli, Marco Farina, Emanuele Paolo Bañados, Eduardo Bosman, Sarah Eilers, Anna-Christina Schindler, Jan-Torge Strauss, Michael A. Vestergaard, Marianne Wang, Feige Blecha, Laura Carilli, Chris L. Comastri, Andrea Connor, Thomas Costa, Tiago Dotti, Massimo Fan, Xiaohui Gilli, Roberto Jun, Hyunsung D. Liu, Weizhe Lupi, Alessandro Marshall, Madeline A. Mazzucchelli, Chiara Meyer, Romain A. Neeleman, Marcel Overzier, Roderik Pensabene, Antonio Riechers, Dominik A. Trakhtenbrot, Benny Trebitsch, Maxime Venemans, Bram Walter, Fabian Yang, Jinyi |
| author_facet | Loiacono, Federica Decarli, Roberto Mignoli, Marco Farina, Emanuele Paolo Bañados, Eduardo Bosman, Sarah Eilers, Anna-Christina Schindler, Jan-Torge Strauss, Michael A. Vestergaard, Marianne Wang, Feige Blecha, Laura Carilli, Chris L. Comastri, Andrea Connor, Thomas Costa, Tiago Dotti, Massimo Fan, Xiaohui Gilli, Roberto Jun, Hyunsung D. Liu, Weizhe Lupi, Alessandro Marshall, Madeline A. Mazzucchelli, Chiara Meyer, Romain A. Neeleman, Marcel Overzier, Roderik Pensabene, Antonio Riechers, Dominik A. Trakhtenbrot, Benny Trebitsch, Maxime Venemans, Bram Walter, Fabian Yang, Jinyi |
| contents | We present JWST/NIRSpec integral field data of the quasar PJ308-21 at $z=6.2342$. As shown by previous ALMA and HST imaging, the quasar has two companion sources, interacting with the quasar host galaxy. The high-resolution G395H/290LP NIRSpec spectrum covers the $2.87-5.27\ \rm μm$ wavelength range and shows the rest-frame optical emission of the quasar with exquisite quality ($S/N\sim 100-400$ per spectral element). Based on the H$β$ line from the broad line region, we obtain an estimate of the black hole mass $M_{\rm BH,Hβ}\sim 2.7\times 10^{9}\ \rm M_{\odot}$. This value is within a factor $\lesssim 1.5$ of the H$α$-based black hole mass from the same spectrum ($M_{\rm BH, Hα}\sim 1.93\times 10^{9}\ \rm M_{\odot}$) and is consistent with a previous estimate relying on the MgII $λ2799$ ($M_{\rm BH, MgII}\sim 2.65\times 10^{9}\ \rm M_{\odot}$). All these $M_{\rm BH}$ are within the $\sim 0.5$ dex intrinsic scatter of the adopted mass calibrations. The high Eddington ratio of PJ308-21 $λ_{\rm Edd,Hβ}\sim 0.67$ ($λ_{\rm Edd,Hα}\sim 0.96$) is in line with the overall quasar population at $z \gtrsim 6$. The relative strengths of the [OIII], FeII and H$β$ lines are consistent with the empirical "Eigenvector 1" correlations as observed for low redshift quasars. We find evidence for blueshifted [OIII] $λ5007$ emission with a velocity offset $Δv_{\rm [OIII]}=-1922\pm 39$ km s$^{-1}$ from the systemic velocity and a $\rm FWHM([OIII])=2776^{+75}_{-74}$ km s$^{-1}$. This may be the signature of an outflow from the nuclear region, despite the true values of $Δv_{\rm [OIII]}$ and $\rm FWHM([OIII])$ are likely more uncertain due to the blending with H$β$ and FeII lines. Our study demonstrates the unique capabilities of NIRSpec in capturing quasar spectra at cosmic dawn and studying their properties in unprecedented detail. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_13319 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | A quasar-galaxy merger at $z\sim6.2$: black hole mass and quasar properties from the NIRSpec spectrum Loiacono, Federica Decarli, Roberto Mignoli, Marco Farina, Emanuele Paolo Bañados, Eduardo Bosman, Sarah Eilers, Anna-Christina Schindler, Jan-Torge Strauss, Michael A. Vestergaard, Marianne Wang, Feige Blecha, Laura Carilli, Chris L. Comastri, Andrea Connor, Thomas Costa, Tiago Dotti, Massimo Fan, Xiaohui Gilli, Roberto Jun, Hyunsung D. Liu, Weizhe Lupi, Alessandro Marshall, Madeline A. Mazzucchelli, Chiara Meyer, Romain A. Neeleman, Marcel Overzier, Roderik Pensabene, Antonio Riechers, Dominik A. Trakhtenbrot, Benny Trebitsch, Maxime Venemans, Bram Walter, Fabian Yang, Jinyi Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics We present JWST/NIRSpec integral field data of the quasar PJ308-21 at $z=6.2342$. As shown by previous ALMA and HST imaging, the quasar has two companion sources, interacting with the quasar host galaxy. The high-resolution G395H/290LP NIRSpec spectrum covers the $2.87-5.27\ \rm μm$ wavelength range and shows the rest-frame optical emission of the quasar with exquisite quality ($S/N\sim 100-400$ per spectral element). Based on the H$β$ line from the broad line region, we obtain an estimate of the black hole mass $M_{\rm BH,Hβ}\sim 2.7\times 10^{9}\ \rm M_{\odot}$. This value is within a factor $\lesssim 1.5$ of the H$α$-based black hole mass from the same spectrum ($M_{\rm BH, Hα}\sim 1.93\times 10^{9}\ \rm M_{\odot}$) and is consistent with a previous estimate relying on the MgII $λ2799$ ($M_{\rm BH, MgII}\sim 2.65\times 10^{9}\ \rm M_{\odot}$). All these $M_{\rm BH}$ are within the $\sim 0.5$ dex intrinsic scatter of the adopted mass calibrations. The high Eddington ratio of PJ308-21 $λ_{\rm Edd,Hβ}\sim 0.67$ ($λ_{\rm Edd,Hα}\sim 0.96$) is in line with the overall quasar population at $z \gtrsim 6$. The relative strengths of the [OIII], FeII and H$β$ lines are consistent with the empirical "Eigenvector 1" correlations as observed for low redshift quasars. We find evidence for blueshifted [OIII] $λ5007$ emission with a velocity offset $Δv_{\rm [OIII]}=-1922\pm 39$ km s$^{-1}$ from the systemic velocity and a $\rm FWHM([OIII])=2776^{+75}_{-74}$ km s$^{-1}$. This may be the signature of an outflow from the nuclear region, despite the true values of $Δv_{\rm [OIII]}$ and $\rm FWHM([OIII])$ are likely more uncertain due to the blending with H$β$ and FeII lines. Our study demonstrates the unique capabilities of NIRSpec in capturing quasar spectra at cosmic dawn and studying their properties in unprecedented detail. |
| title | A quasar-galaxy merger at $z\sim6.2$: black hole mass and quasar properties from the NIRSpec spectrum |
| topic | Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2402.13319 |