The Stellar Mass-Black Hole Mass Relation at z ～ 2 down to MBH ～ 107 M⊙ Determined by HETDEX

作者：Zhang, Yechi^*; Ouchi, Masami; Gebhardt, Karl; Liu, Chenxu; Harikane, Yuichi; Cooper, Erin Mentuch; Davis, Dustin; Farrow, Daniel J.; Gawiser, Eric; Hill, Gary J.; Kollatschny, Wolfram; Ono, Yoshiaki; Schneider, Donald P.; Finkelstein, Steven L.; Gronwall, Caryl; Jogee, Shardha; Krumpe, Mirko

来源：Astrophysical Journal, 2023, 948(2): 103.

DOI：10.3847/1538-4357/acc2c2

• ACTIVE GALACTIC NUCLEI
• SPECTRAL ENERGY-DISTRIBUTIONS
• HOST GALAXIES
• COSMIC EVOLUTION
• STAR-FORMATION
• LUMINOSITY FUNCTIONS
• QUIESCENT GALAXIES
• SCALING RELATIONS
• BILLION YEARS
• GROWTH

We investigate the stellar mass-black hole mass (M-*-M-BH) relation with type 1 active galactic nuclei (AGNs) down to M-BH = 10(7) M-circle dot, corresponding to a similar or equal to -21 absolute magnitude in rest-frame ultraviolet, at z = 2-2.5. Exploiting the deep and large-area spectroscopic survey of the Hobby-Eberly Telescope Dark Energy Experiment (HETDEX), we identify 66 type 1 AGNs with M-BH ranging from 10(7)-10(10) M-circle dot that are measured with single-epoch virial method using C IV emission lines detected in the HETDEX spectra. M-* of the host galaxies are estimated from optical to near-infrared photometric data taken with Spitzer, the Wide-field Infrared Survey Explorer, and ground-based 4-8 m class telescopes by CIGALE spectral energy distribution (SED) fitting. We further assess the validity of SED fitting in two cases by host-nuclear decomposition performed through surface brightness profile fitting on spatially resolved host galaxies with the James Webb Space Telescope/NIRCam CEERS data. We obtain the M-*-M-BH relation covering the unexplored low-mass ranges of M-BH similar to 10(7)-10(8) M-circle dot, and conduct forward modeling to fully account for the selection biases and observational uncertainties. The intrinsic M-*-M-BH relation at z similar to 2 has a moderate positive offset of 0.52 +/- 0.14 dex from the local relation, suggestive of more efficient black hole growth at higher redshift even in the low-mass regime of M-BH similar to 10(7)-10(8) M-circle dot. Our M-*-M-BH relation is inconsistent with the M-BH suppression at the low-M-* regime predicted by recent hydrodynamic simulations at a 98% confidence level, suggesting that feedback in the low-mass systems may be weaker than those produced in hydrodynamic simulations.

• 单位
  云南大学; 中国科学院国家天文台