Signatures of Massive Black Hole Merger Host Galaxies from Cosmological Simulations II: Unique Stellar Kinematics in Integral Field Unit Spectroscopy

Abstract

Secure methods for identifying the host galaxies of individual massive black hole (MBH) binaries and mergers detected by gravitational wave experiments such as LISA and Pulsar Timing Arrays are currently lacking, but will be critical to a variety of science goals. Recently in Bardati et al. (2024, Paper I), we used the Romulus25 cosmological simulation to show that MBH merger host galaxies have unique morphologies in imaging, due to their stronger bulges. Here, we use the same sample of simulated MBH merger host galaxies to investigate their stellar kinematics, as probed by optical integral field unit (IFU) spectroscopy. We perform stellar population synthesis and dust radiative transfer to generate synthetic 3D optical spectral datacubes of each simulated galaxy, and produce mock stellar kinematic maps. Based on a linear discriminant analysis of a combination of kinematic parameters derived from these maps, we show that this approach can identify MBH binary and merger host galaxies with accuracies that increase with chirp mass and mass ratio. For mergers with high chirp masses (>10^8.2 Msun) and high mass ratios (>0.5), the accuracies reach >85%, and their host galaxies are uniquely characterized by slower rotation and stronger stellar kinematic misalignments. These kinematic properties are commonly associated with massive early-type galaxies that have experienced major mergers, and naturally act as signposts for MBH binaries and mergers with high chirp masses and mass ratios. These results suggest that IFU spectroscopy should also play a role in telescope follow-up of future MBH binaries and mergers detected in gravitational waves.

18 pages, 7 figures. ApJ accepted version

References in corpus (45)

• Overview of the SDSS-IV MaNGA Survey: Mapping Nearby Galaxies at Apache Point Observatory
• The NANOGrav 15-year Data Set: Evidence for a Gravitational-Wave Background
• Improving the full spectrum fitting method: accurate convolution with Gauss-Hermite functions
• Search for an isotropic gravitational-wave background with the Parkes Pulsar Timing Array
• Searching for the nano-Hertz stochastic gravitational wave background with the Chinese Pulsar Timing Array Data Release I
• The second data release from the European Pulsar Timing Array III. Search for gravitational wave signals
• The MUSE second-generation VLT instrument
• Evolutionary Stellar Population Synthesis with MILES. Part I: The Base Models and a New Line Index System
• The SAURON project -- IX. A kinematic classification for early-type galaxies
• The SAMI Galaxy Survey: instrument specification and target selection
• Massive black hole binary mergers within sub-pc scale gas discs
• The NANOGrav 15-year Data Set: Constraints on Supermassive Black Hole Binaries from the Gravitational Wave Background
• A possible close supermassive black-hole binary in a quasar with optical periodicity
• Rapid Formation of Supermassive Black Hole Binaries in Galaxy Mergers with Gas
• SKIRT: an Advanced Dust Radiative Transfer Code with a User-Friendly Architecture
• Gravitational waves from resolvable massive black hole binary systems and observations with Pulsar Timing Arrays
• Full spectrum fitting with photometry in pPXF: stellar population versus dynamical masses, non-parametric star formation history and metallicity for 3200 LEGA-C galaxies at redshift z~0.8
• Supermassive black hole binaries in gaseous and stellar circumnuclear discs: orbital dynamics and gas accretion
• The MASSIVE Survey - I. A Volume-Limited Integral-Field Spectroscopic Study of the Most Massive Early-Type Galaxies within 108 Mpc
• Off the Beaten Path: A New Approach to Realistically Model The Orbital Decay of Supermassive Black Holes in Galaxy Formation Simulations
• The Local Nanohertz Gravitational-Wave Landscape From Supermassive Black Hole Binaries
• The SAMI Galaxy Survey: the link between angular momentum and optical morphology
• The gravitational-wave background null hypothesis: Characterizing noise in millisecond pulsar arrival times with the Parkes Pulsar Timing Array
• The NANOGrav 15-year Data Set: Bayesian Limits on Gravitational Waves from Individual Supermassive Black Hole Binaries
• Black hole mergers from dwarf to massive galaxies with the NewHorizon and Horizon-AGN simulations
• Electromagnetic Counterparts to Massive Black Hole Mergers
• Prospects for gravitational-wave detection and supermassive black hole astrophysics with pulsar timing arrays
• The second data release from the European Pulsar Timing Array V. Search for continuous gravitational wave signals
• Reaction of Accretion Disks to Abrupt Mass Loss During Binary Black Hole Merger
• Perturbed disks get shocked. Binary black hole merger effects on accretion disks
• The CALIFA view on stellar angular momentum across the Hubble sequence
• The birth of a supermassive black hole binary
• Multi-messenger Time-domain Signatures Of Supermassive Black Hole Binaries
• Massive Black Hole Binaries from the TNG50-3 Simulation: I. Coalescence and LISA Detection Rates
• Massive central galaxies of galaxy groups in the Romulus simulations: an overview of galaxy properties at z=0
• Galaxy fields of LISA massive black hole mergers in a simulated Universe
• Accurate Identification of Galaxy Mergers with Stellar Kinematics
• Multimessenger study of merging massive black holes in the OBELISK simulation: gravitational waves, electromagnetic counterparts, and their link to galaxy and black hole populations
• The MASSIVE Survey XIV -- Stellar Velocity Profiles and Kinematic Misalignments from 200 pc to 20 kpc in Massive Early-type Galaxies
• Properties and merger signatures of galaxies hosting LISA coalescing massive black hole binaries
• Identifying Host Galaxies of Supermassive Black Hole Binaries Found by PTAs
• Morphological evolution of supermassive black hole merger hosts and multimessenger signatures
• Unveiling the hosts of parsec-scale massive black hole binaries: morphology and electromagnetic signatures
• Signatures of Massive Black Hole Merger Host Galaxies from Cosmological Simulations I: Unique Galaxy Morphologies in Imaging
• On the detectability of massive black hole merger eventsby LISA

Cited by in corpus (3)

• Gravitational Waves from Massive Black Hole Mergers in ASTRID: Predictions for LISA
• The multi-wavelength Tully-Fisher relation in the TNG50 cosmological simulation
• The Host Galaxies of PTA Sources: Converting Supermassive BH Binary Parameters into EM Observables