Not Just Winds: Why Models Find That Binary Black Hole Formation Is Metallicity-dependent, while Binary Neutron Star Formation Is Not by L. A. C. van Son, S. K. Roy, I. Mandel, W. M. Farr, A. Lam, J. Merritt, F. S. Broekgaarden, A. A. C. Sander, J. J. Andrews

“…Both detailed and rapid population studies alike predict that binary black hole (BHBH) formation is orders of magnitude more efficient at low metallicity than high metallicity, while binary neutron star (NSNS) formation remains mostly flat with metallicity, and black hole–neutron star mergers show intermediate behavior. …”
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Are There Black Hole Symbiotic X-Ray Binaries? by Zhu-Ling Deng, Xiang-Dong Li

“…While there are over a dozen known neutron star (NS) symbiotic X-ray binaries (SyXBs) in the Galaxy, no SyXBs containing a black hole (BH) have been detected. …”
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X-Ray Reflection Signatures of Supermassive Black Hole Binaries by Julie Malewicz, David R. Ballantyne, Tamara Bogdanović, Laura Brenneman, Thomas Dauser

“…We investigate the presence of supermassive black hole (SMBH) binary signatures and the feasibility of identifying them through X-ray reflection spectra. …”
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Deep Neural Emulation of the Supermassive Black Hole Binary Population by Nima Laal, Stephen R. Taylor, Luke Zoltan Kelley, Joseph Simon, Kayhan Gültekin, David Wright, Bence Bécsy, J. Andrew Casey-Clyde, Siyuan Chen, Alexander Cingoranelli, Daniel J. D’Orazio, Emiko C. Gardiner, William G. Lamb, Cayenne Matt, Magdalena S. Siwek, Jeremy M. Wachter

“…While supermassive black hole (SMBH) binaries are not the only viable source for the low-frequency gravitational wave background (GWB) signal evidenced by the most recent pulsar timing array (PTA) data sets, they are expected to be the most likely. …”
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Exploring Field-evolution and Dynamical-capture Coalescing Binary Black Holes in GWTC-3 by Yin-Jie Li, Shao-Peng Tang, Shi-Jie Gao, Dao-Cheng Wu, Yuan-Zhu Wang

“…We investigate formation channels for merging binary black holes (BBHs) in GWTC-3, with a dedicated semiparametric population model. …”
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Multimessenger Emission by Magnetically Arrested Disks and Relativistic Jets of Black Hole X-Ray Binaries by Riku Kuze, Shigeo S. Kimura, Ke Fang

“…Black hole X-ray binaries (BHXBs) are observed in various wavelengths from radio to GeV gamma rays. …”
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Formation and Evolution of Compact Binaries Containing Intermediate-mass Black Holes in Dense Star Clusters by Seungjae Lee, Hyung Mok Lee, Ji-hoon Kim, Rainer Spurzem, Jongsuk Hong, Eunwoo Chung

“…We investigate the evolution of star clusters containing intermediate-mass black holes (IMBHs) of 300–5000 M _⊙ , focusing on the formation and evolution of IMBH–stellar-mass black hole (M _BH ≲ 10 ^2 M _⊙ ) binaries. …”
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Frequency and Abundance of Binary Supermassive Black Holes from Optical Variability Surveys (Fabulovs): Hubble Space Telescope Imaging of Radial-velocity-selected Binary Candidates by Liam Nolan, Ming-Yang Zhuang, Xin Liu, Yu-Ching Chen, Shreya Majumdar, Junyao Li, Yue Shen

“…Subparsec binary supermassive black holes (BSBHs) should be common from galaxy mergers, yet direct evidence has been elusive. …”
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The Role of High-mass Stellar Binaries in the Formation of High-mass Black Holes in Dense Star Clusters by Ambreesh Khurana, Sourav Chatterjee

“…Recent detections of gravitational waves from mergers of binary black holes (BBHs) with premerger source-frame individual masses in the so-called upper mass gap, expected due to (pulsational) pair instability supernovae ((P)PISNe), have created immense interest in the astrophysical production of high-mass black holes (BHs). …”
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Where Have All the Little Red Dots Gone? Supermassive Black Hole Binary Dynamics and Its Impact on Galaxy Properties by Fazeel Mahmood Khan, Benjamin L. Davis, Andrea Valerio Macciò, Kelly Holley-Bockelmann

“…We track the complete evolution of SMBH binaries into the three-body hardening and gravitational-wave (GW) emission phase. …”
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Gravitational Waves from Black Hole Emission by Tousif Islam, Gaurav Khanna, Steven L. Liebling

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The Host Galaxies of Pulsar Timing Array Sources: Converting Supermassive Black Hole Binary Parameters into Electromagnetic Observables by Niccolò Veronesi, Maria Charisi, Stephen R. Taylor, Jessie Runnoe, Daniel J. D’Orazio

“…Pulsar timing arrays (PTAs) are approaching the sensitivity required to resolve gravitational waves (GWs) from individual supermassive black hole (SMBH) binaries. However, the large uncertainty in source localization will make the identification of its host environment challenging. …”
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A Parameter Study of the Electromagnetic Signatures of an Analytical Mini-disk Model for Supermassive Black Hole Binary Systems by Kaitlyn Porter, Scott C. Noble, Eduardo M. Gutiérrez, Joaquín Pelle, Manuela Campanelli, Jeremy Schnittman, Bernard J. Kelly

“…We have developed an analytical accretion-disk model for the mini-disks of an SMBHB system and produced images and light curves using a general-relativistic ray-tracing code and a superimposed harmonic binary BH metric. This analytical model greatly reduces the time and computational resources needed to explore these systems, while incorporating some key information from simulations. …”
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Fine-tuned Supernova or Failed Explosion? Decoding the Origins of the G3425 Binary by Zsolt Regály, Viktória Fröhlich, József Vinkó

“…A binary system (G3425) consisting of a massive unseen component and a red giant star on a nearly circular orbit was recently discovered. …”
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Detection Rate of Galaxy Cluster-lensed Stellar Binary Black Hole Mergers by the Third-generation Gravitational-wave Detectors by Zhiwei Chen, Yushan Xie, Youjun Lu, Huanyuan Shan, Nan Li, Yuchao Luo, Xiao Guo

“…Gravitational waves (GWs) from stellar binary black hole (sBBH) mergers can be strongly gravitational lensed by intervening galaxies/galaxy clusters. …”
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Features of adsorption of binary mixtures of cationic and non-ionic surfactants by non-porous carbon sorbent by O. D. Kochkodan, V. I. Maksin, R. S. Boiko

“…The areas per hexadecylpyridinium bromide and the oxyethylated octylphenols molecules in the adsorption layer while adsorbing from their binary solutions are lesser than ones for the surfactants adsorption from their individual solutions, and smaller than the corresponding areas at the solution-air interface. …”
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Tidal Disruptions of Stars by Supermassive and Intermediate-mass Black Hole Binaries: The Effects of the First-order Post-Newtonian Cross Terms by Xiao-Jun Wu, Yan Luo, Jie Li, Ye-Fei Yuan, Wenbin Lin

“…In this study, we employ N -body simulations to investigate the impact of the 1PN cross terms on the orbits of stars around an intermediate-mass black hole (IMBH) perturbed by an outer SMBH. Our findings indicate that while the 1PN cross terms do not substantially affect the fractions of stellar outcomes, they can cause considerable variations in the orbits of stars around IMBH–SMBH binaries. …”
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Magnetic Accretion Flow Explains the Hysteresis Q-diagram Seen in Outbursts of Black Hole Low-mass X-Ray Binaries by Jiahui Huang, Hua Feng, Lian Tao

“…Black hole low-mass X-ray binaries undergo quiescence-outburst cycles. …”
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A Systematic Search for Candidate Supermassive Black Hole Binaries Using Periodic Mid-infrared Light Curves of Active Galactic Nuclei by Di Luo, Ning Jiang, Xin Liu

“…Periodic variability in active galactic nuclei (AGNs) is a promising method for studying subparsec supermassive black hole binaries (SMBHBs), which are a challenging detection target. …”
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Geometry of the Comptonization Region of MAXI J1348−630 through Type-C Quasiperiodic Oscillations with NICER by Kevin Alabarta, Mariano Méndez, Federico García, Diego Altamirano, Yuexin Zhang, Liang Zhang, David M. Russell, Ole König

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