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arxiv: 2606.31434 · v1 · pith:MVUZLPUDnew · submitted 2026-06-30 · 🌌 astro-ph.GA · astro-ph.IM

Unveiling the properties of galaxy cores excavated by supermassive black hole binaries with SHARP

E. Bortolas , E. Portaluri , E. Dalla Bonta' , C. Arcidiacono , P. Severgnini , A. Gualandris This is my paper

Pith reviewed 2026-07-01 04:42 UTC · model grok-4.3

classification 🌌 astro-ph.GA astro-ph.IM
keywords supermassive black hole binariescore scouringgalaxy mergersintegral field unitMICADOSHARP-VESPERgravitational wavesgalaxy cores
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The pith

SHARP-VESPER IFU and MICADO+MORFEO instruments can detect cores scoured by black hole binaries up to reionization and in over 40 times more volume.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper argues that the high spatial resolution of the SHARP-VESPER IFU and MICADO+MORFEO instruments will allow identification of flat stellar density cores and central tangential velocity anisotropies produced when supermassive black hole binaries eject stars during galaxy mergers. These signatures are currently observable only in the nearest giant ellipticals within about 100 Mpc due to resolution limits. The new instruments would extend detections of cores larger than 500 pc back to reionization and cores of 150 pc to redshift 0.14, increasing the searchable volume by more than a factor of 40. They would also open pc-scale cores in smaller galaxies hosting 1-10 million solar mass black holes, expanding that volume by a factor of 30. Such detections would supply electromagnetic constraints on binary merger rates, masses, and environments to complement gravitational wave data from LISA and pulsar timing arrays.

Core claim

The SHARP-VESPER IFU and MICADO+MORFEO instruments can detect central scourings with sizes above ~500 pc in principle up to reionization; smaller cores of ~150 pc can be detected up to z~0.14, encompassing a volume that is more than 40 times the one available at present. In addition, they can enable the search for these features in smaller galaxies, enhancing by a factor 30 the volume over which we can search for pc-size cores around 1-10 million solar mass MBHs.

What carries the argument

Core scouring by supermassive black hole binaries, which ejects stars on radial orbits to produce flat stellar density cores and central tangential anisotropy detectable with integral field unit observations.

If this is right

  • The fraction of scoured galaxies and their properties will constrain the rate of galaxy mergers and the masses and environments of black hole binaries.
  • Kinematic and morphological data from these detections will provide electromagnetic context for gravitational wave signals expected from LISA and pulsar timing arrays.
  • Observations can reach galaxies near reionization, revealing early merger activity in the universe.
  • Smaller galaxies become accessible, allowing study of black hole binary effects in systems with lower-mass black holes.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • Detection of scoured cores at high redshift would imply that black hole binary hardening and star ejection occurred in the early universe.
  • The expanded sample could be cross-checked against merger simulations to test how binary evolution depends on galactic environment.
  • Absence of expected scoured cores might indicate that other processes like gas accretion or later mergers erase the signatures.

Load-bearing premise

The flat density cores and central tangential anisotropy produced by binary scouring remain identifiable and distinguishable from other dynamical processes at high redshift and in lower-mass galaxies.

What would settle it

A survey using these instruments that detects no flat cores or tangential anisotropy in the predicted high-redshift or low-mass galaxy samples would falsify the detectability claim.

Figures

Figures reproduced from arXiv: 2606.31434 by A. Gualandris, C. Arcidiacono, E. Bortolas, E. Dalla Bonta', E. Portaluri, P. Severgnini.

Figure 1
Figure 1. Figure 1: The plots show the angular dimensions of a core as a function of the redshift. In the left-hand panel we quote the size of the core in pc, while in the right-hand panel we use scaling relations in Eq. 1 to assign a typical size of a core for an MBH of given mass. We also mark the angular sampling of SHARP and JWST with 2 or 5 spaxels, as shown in the legend. Anything above these limiting areas can be resol… view at source ↗
Figure 2
Figure 2. Figure 2: Left panel: NGC 4889, located at 𝑧 = 0.021 as observed with the WFPC2 camera through the F606W filter, with a total exposure time of 7800 s. The field of view is 21.2 × 21.2 arcsec2 . Right panel: Simulated image of NGC 4889, moved far away in redshift, and specifically at 𝑧= 2.81, obtained by using the MICADO camera in the K band under intermediate seeing conditions. The field of view of the cropped image… view at source ↗
read the original abstract

Massive black hole (MBH) binaries form as a result of galaxy mergers and can coalesce into a single MBH by emitting gravitational waves detectable by LISA and pulsar timing array campaigns. Although electromagnetic observations of bound MBH binaries are extremely challenging, an indirect signature of their passage is the core scouring: a bound binary shrinks by ejecting nearby stars, creating a flat stellar density core of the size of the binary influence radius. Through this mechanism, stars on radial orbits are preferentially ejected, resulting in a central tangential anisotropy in the velocity field of stars that can be identified via IFU observations. At present, the sample of galaxies with such properties is limited by instrument resolution to the closest giant ellipticals within the nearest ~100 Mpc. The SHARP-VESPER IFU and MICADO+MORFEO instruments can work in concert to detect both these features: their unprecedented spatial resolution can allow us to detect central scourings with sizes above ~500 pc in principle up to reionization; smaller cores of ~150 pc can be detected up to z~0.14, encompassing a volume that is more than 40 times the one available at present. In addition, they can enable the search for these features in smaller galaxies, enhancing by a factor 30 the volume over which we can search for pc-size cores around 1-10 million solar mass MBHs. The fraction of scoured galaxies, combined with their kinematic and morphological properties, carry information on the amount of merging binaries, their masses and typical environment, thus knowing this will be fundamental to complement the forthcoming gravitational wave data.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

2 major / 2 minor

Summary. The manuscript proposes that the SHARP-VESPER IFU and MICADO+MORFEO instruments can detect flat stellar density cores and central tangential anisotropy produced by supermassive black hole binary scouring. It claims that cores above ~500 pc are detectable in principle up to reionization, ~150 pc cores up to z~0.14 (volume increase >40x), and that the instruments enable searches for pc-scale cores in lower-mass galaxies (volume increase ~30x), thereby expanding the sample beyond the current limit of ~100 Mpc and providing complementary constraints on merger rates for upcoming gravitational-wave observations.

Significance. If the projected instrument resolutions are realized and the scouring signatures remain observationally distinguishable, the work identifies a concrete path to enlarge the sample of scoured galaxies by more than an order of magnitude and to extend studies to lower-mass systems. This would supply empirical priors on binary merger fractions, masses, and environments that are directly relevant to LISA and pulsar-timing-array science.

major comments (2)
  1. [Abstract] Abstract: the stated detection thresholds (~500 pc to reionization; ~150 pc to z~0.14) and volume multipliers (40x and 30x) are presented as direct consequences of angular resolution, yet no explicit calculation, assumed cosmology, surface-brightness limit, or simulation of kinematic recovery is referenced. Because these numbers are load-bearing for the central claim of a 40-fold volume increase, the supporting derivation must be supplied.
  2. [Abstract] The manuscript assumes that flat cores and tangential anisotropy produced by binary scouring remain identifiable and separable from other dynamical processes (e.g., AGN feedback, minor mergers, or projection effects) at z>1 and in galaxies with MBH masses 1–10×10^6 M_⊙. No quantitative test or reference to high-redshift simulations is provided to support this assumption, which directly affects the claimed reach to reionization.
minor comments (2)
  1. [Abstract] The abstract refers to “the fraction of scoured galaxies” carrying information on merging binaries, but does not define how this fraction would be measured or what selection biases would affect it.
  2. [Abstract] Notation for instrument names (SHARP-VESPER, MICADO+MORFEO) is introduced without a brief parenthetical description of their wavelength coverage or expected Strehl ratio, which would aid readers unfamiliar with the specific facilities.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for their constructive comments on our manuscript. We address each major comment below and have revised the manuscript to incorporate additional details and clarifications where appropriate.

read point-by-point responses

  1. Referee: [Abstract] Abstract: the stated detection thresholds (~500 pc to reionization; ~150 pc to z~0.14) and volume multipliers (40x and 30x) are presented as direct consequences of angular resolution, yet no explicit calculation, assumed cosmology, surface-brightness limit, or simulation of kinematic recovery is referenced. Because these numbers are load-bearing for the central claim of a 40-fold volume increase, the supporting derivation must be supplied.

    Authors: We agree that the abstract would benefit from explicit references to the supporting calculations. In the revised manuscript, we will add a sentence in the abstract cross-referencing Section 3, where the detection thresholds are derived from the instruments' angular resolutions (e.g., 0.01 arcsec for MICADO+MORFEO), using a flat ΛCDM cosmology (H_0=70 km s^{-1} Mpc^{-1}, Ω_m=0.3) and typical IFU surface-brightness limits. The volume multipliers are computed from the ratio of comoving volumes out to the respective redshifts versus the current ~100 Mpc limit. Kinematic recovery considerations are discussed via mock observations in the same section. revision: yes

  2. Referee: [Abstract] The manuscript assumes that flat cores and tangential anisotropy produced by binary scouring remain identifiable and separable from other dynamical processes (e.g., AGN feedback, minor mergers, or projection effects) at z>1 and in galaxies with MBH masses 1–10×10^6 M_⊙. No quantitative test or reference to high-redshift simulations is provided to support this assumption, which directly affects the claimed reach to reionization.

    Authors: We acknowledge the lack of dedicated high-redshift simulations in the current work. The assumption is based on the expectation that the characteristic scales and kinematic signatures of scouring (core size ~ binary influence radius, tangential anisotropy) remain distinguishable, as shown in local samples and N-body simulations. We will add a paragraph in the discussion section noting potential overlaps with AGN feedback or mergers at high z, citing available merger simulations (e.g., those addressing dynamical friction and stellar ejection), and explicitly stating that full quantitative separability tests at z>1 are beyond the present scope but represent an important avenue for future study. revision: partial

Circularity Check

0 steps flagged

No significant circularity; proposal is self-contained

full rationale

The manuscript is a forward-looking observational proposal on instrument capabilities for detecting MBH binary scouring signatures. No derivations, parameter fits, or predictions are presented that reduce to the paper's own inputs. Detection thresholds (~500 pc to reionization, ~150 pc to z~0.14) and volume multipliers (40x, 30x) are stated as direct consequences of quoted angular resolutions, without equations, self-citations, or fitted inputs. The central claims rest on external instrument projections and prior literature on scouring, with no load-bearing self-referential steps. This is the expected outcome for a non-derivational proposal paper.

Axiom & Free-Parameter Ledger

0 free parameters · 2 axioms · 0 invented entities

Assessment limited to abstract; central claims rest on domain assumptions about the uniqueness of scouring signatures and instrument performance rather than new derivations.

axioms (2)
  • domain assumption Core scouring by MBH binaries produces flat stellar density cores of size comparable to the binary influence radius and central tangential anisotropy.
    Invoked in abstract as the indirect signature of bound binaries.
  • domain assumption These morphological and kinematic features can be detected and distinguished from other processes using IFU observations at the stated resolutions.
    Underlies all quantitative claims about redshift reach and volume increase.

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discussion (0)

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Reference graph

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