GA-NIFS and EIGER: A merging quasar host at z = 7 with an overmassive black hole

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Volume 702 (October 2025)

A&A, 702 (2025) A50

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Table 4.

Extracted NIRCam magnitudes for the quasar host and companion galaxy, and their stellar mass (M_*), fraction of stars formed in the recent starburst (f_starburst), and metallicity (Z) measured from the subsequent SED fitting.

	m_F115W	m_F200W	m_F356W	M_*	f_starburst	log(Z/Z_⊙)
	(mag)			(10⁹ M_⊙)
Region 1 (Host)	25.94 ± 0.20	25.48 ± 0.37*	25.72 ± 0.47*	$3 . 0_{- 1.4}^{+ 2.5}$ $3.0^{+2.5}_{-1.4}$	$0 . 57_{- 0.29}^{+ 0.21}$ $0.57^{+0.21}_{-0.29}$	$- 0 . 50_{- 0.24}^{+ 0.24}$ $-0.50^{+0.24}_{-0.24}$
Region 2 (Companion)	25.32 ± 0.12	24.95 ± 0.11	25.11 ± 0.18	$2 . 7_{- 0.5}^{+ 0.5}$ $2.7^{+0.5}_{-0.5}$	$0 . 99_{- 0.01}^{+ 0.01}$ $0.99^{+0.01}_{-0.01}$	$0 . 09_{- 0.69}^{+ 0.08}$ $0.09^{+0.08}_{-0.69}$

Notes. Magnitudes marked with a ‘*’ denote unsuccessful detections, with a successful detection classified as one where the magnitude error is < 0.3 mag.

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