Studies of rest-frame optical emission in quasars at z > 6 have historically been limited by the wavelengths accessible by ground-based telescopes. The James Webb Space Telescope (JWST) now offers the opportunity to probe this emission deep into the reionization epoch. We report the observations of eight quasars at z > 6.5 using the JWST/NIRCam Wide Field Slitless Spectroscopy as a part of the “A SPectroscopic survey of biased halos In the Reionization Era (ASPIRE)” program. Our JWST spectra cover the quasars’ emission between rest frame ∼4100 and 5100 Å. The profiles of these quasars’ broad Hβ emission lines span a full width at half maximum from 3000 to 6000 km s−1. The Hβ-based virial black hole (BH) masses, ranging from 0.6 to 2.1 billion solar masses, are generally consistent with their Mg II-based BH masses. The new measurements based on the more reliable Hβ tracer thus confirm the existence of a billion solar-mass BHs in the reionization epoch. In the observed [O III] λλ 4960,5008 doublets of these luminous quasars, broad components are more common than narrow core components ( 1200 km s−1), and only one quasar shows stronger narrow components than broad. Two quasars exhibit significantly broad and blueshifted [O III] emission, thought to trace galactic-scale outflows, with median velocities of −610 and −1430 km s−1 relative to the [C II] 158 μm line. All eight quasars show strong optical Fe II emission and follow the eigenvector 1 relations defined by low-redshift quasars. The entire ASPIRE program will eventually cover 25 quasars and provide a statistical sample for the studies of the BHs and quasar spectral properties.

A SPectroscopic Survey of Biased Halos in the Reionization Era (ASPIRE): A First Look at the Rest-frame Optical Spectra of z > 6.5 Quasars Using JWST

Lupi A.;
2023-01-01

Abstract

Studies of rest-frame optical emission in quasars at z > 6 have historically been limited by the wavelengths accessible by ground-based telescopes. The James Webb Space Telescope (JWST) now offers the opportunity to probe this emission deep into the reionization epoch. We report the observations of eight quasars at z > 6.5 using the JWST/NIRCam Wide Field Slitless Spectroscopy as a part of the “A SPectroscopic survey of biased halos In the Reionization Era (ASPIRE)” program. Our JWST spectra cover the quasars’ emission between rest frame ∼4100 and 5100 Å. The profiles of these quasars’ broad Hβ emission lines span a full width at half maximum from 3000 to 6000 km s−1. The Hβ-based virial black hole (BH) masses, ranging from 0.6 to 2.1 billion solar masses, are generally consistent with their Mg II-based BH masses. The new measurements based on the more reliable Hβ tracer thus confirm the existence of a billion solar-mass BHs in the reionization epoch. In the observed [O III] λλ 4960,5008 doublets of these luminous quasars, broad components are more common than narrow core components ( 1200 km s−1), and only one quasar shows stronger narrow components than broad. Two quasars exhibit significantly broad and blueshifted [O III] emission, thought to trace galactic-scale outflows, with median velocities of −610 and −1430 km s−1 relative to the [C II] 158 μm line. All eight quasars show strong optical Fe II emission and follow the eigenvector 1 relations defined by low-redshift quasars. The entire ASPIRE program will eventually cover 25 quasars and provide a statistical sample for the studies of the BHs and quasar spectral properties.
2023
Yang, J.; Wang, F.; Fan, X.; Hennawi, J. F.; Barth, A. J.; Banados, E.; Sun, F.; Liu, W.; Cai, Z.; Jiang, L.; Li, Z.; Onoue, M.; Schindler, J. -T.; Shen, Y.; Wu, Y.; Bhowmick, A. K.; Bieri, R.; Blecha, L.; Bosman, S.; Champagne, J. B.; Colina, L.; Connor, T.; Costa, T.; Davies, F. B.; Decarli, R.; De Rosa, G.; Drake, A. B.; Egami, E.; Eilers, A. -C.; Evans, A. E.; Farina, E. P.; Habouzit, M.; Haiman, Z.; Jin, X.; Jun, H. D.; Kakiichi, K.; Khusanova, Y.; Kulkarni, G.; Loiacono, F.; Lupi, A.; Mazzucchelli, C.; Pan, Z.; Rojas-Ruiz, S.; Strauss, M. A.; Tee, W. L.; Trakhtenbrot, B.; Trebitsch, M.; Venemans, B.; Vestergaard, M.; Volonteri, M.; Walter, F.; Xie, Z. -L.; Yue, M.; Zhang, H.; Zhang, H.; Zou, S.
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11383/2165854
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 7
  • ???jsp.display-item.citation.isi??? 9
social impact