Improving constraints on the extended mass distribution in the Galactic Center with stellar orbits

Abstract

Studying the orbital motion of stars around Sagittarius A* in the Galactic Center provides a unique opportunity to probe the gravitational potential near the supermassive black hole at the heart of our Galaxy. Interferometric data obtained with the GRAVITY instrument at the Very Large Telescope Interferometer (VLTI) since 2016 has allowed us to achieve unprecedented precision in tracking the orbits of these stars. GRAVITY data have been key to detecting the in-plane, prograde Schwarzschild precession of the orbit of the star S2, as predicted by General Relativity. By combining astrometric and spectroscopic data from multiple stars, including S2, S29, S38, and S55 - for which we have data around their time of pericenter passage with GRAVITY - we can now strengthen the significance of this detection to an approximately $10\sigma$ confidence level. The prograde precession of S2's orbit provides valuable insights into the potential presence of an extended mass distribution surrounding Sagittarius A*, which could consist of a dynamically relaxed stellar cusp comprised of old stars and stellar remnants, along with a possible dark matter spike. Our analysis, based on two plausible density profiles - a power-law and a Plummer profile - constrains the enclosed mass within the orbit of S2 to be consistent with zero, establishing an upper limit of approximately $1200M_{\odot }$ with a $1\sigma$ confidence level. This significantly improves our constraints on the mass distribution in the Galactic Center. Our upper limit is very close to the expected value from numerical simulations for a stellar cusp in the Galactic Center, leaving little room for a significant enhancement of dark matter density near Sagittarius A*.

Submitted to A&A on September 17, 2024

References in corpus (43)

• First Sagittarius A* Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole in the Center of the Milky Way
• Measuring Distance and Properties of the Milky Way's Central Supermassive Black Hole with Stellar Orbits
• The Galactic Center Massive Black Hole and Nuclear Star Cluster
• Closest Star Seen Orbiting the Supermassive Black Hole at the Centre of the Milky Way
• Detection of the gravitational redshift in the orbit of the star S2 near the Galactic centre massive black hole
• A geometric distance measurement to the Galactic Center black hole with 0.3% uncertainty
• Dark matter annihilation at the galactic center
• The First Measurement of Spectral Lines in a Short-Period Star Bound to the Galaxy's Central Black Hole: A Paradox of Youth
• SINFONI in the Galactic Center: young stars and IR flares in the central light month
• First Light for GRAVITY: Phase Referencing Optical Interferometry for the Very Large Telescope Interferometer
• Intermediate and Extreme Mass-Ratio Inspirals -- Astrophysics, Science Applications and Detection using LISA
• Detection of the Schwarzschild precession in the orbit of the star S2 near the Galactic centre massive black hole
• Relativistic redshift of the star S0-2 orbiting the Galactic center supermassive black hole
• An Update on Monitoring Stellar Orbits in the Galactic Center
• Detection of orbital motions near the last stable circular orbit of the massive black hole SgrA*
• An Extremely Top-Heavy IMF in the Galactic Center Stellar Disks
• The mass distribution in the Galactic Centre from interferometric astrometry of multiple stellar orbits
• Testing General Relativity with stellar orbits around the supermassive black hole in our Galactic center
• Strong mass segregation around a massive black hole
• The old nuclear star cluster in the Milky Way: dynamics, mass, statistical parallax, and black hole mass
• Testing Properties of the Galactic Center Black Hole Using Stellar Orbits
• High angular resolution integral-field spectroscopy of the Galaxy's nuclear cluster: a missing stellar cusp?
• Stellar Dynamics and Stellar Phenomena Near A Massive Black Hole
• Twelve years of spectroscopic monitoring in the Galactic Center: the closest look at S-stars near the black hole
• On strong mass segregation around a massive black hole: Implications for lower-frequency gravitational-wave astrophysics
• The distribution of old stars around the Milky Way's central black hole I: Star counts
• Polarimetry and Astrometry of NIR Flares as Event Horizon Scale, Dynamical Probes for the Mass of Sgr A*
• The distribution of stars around the Milky Way's black hole III: Comparison with simulations
• Pinpointing the near-infrared location of Sgr A* by correcting optical distortion in the NACO imager
• $f(R)$-gravity after the detection of the orbital precession of the S2 star around the Galactic centre massive black hole
• The geodesic motion of S2 and G2 as a test of the fermionic dark matter nature of our galactic core
• The dark mass signature in the orbit of S2
• Exploring dark matter spike distribution around the Galactic centre with stellar orbits
• The Enhanced Resolution Imager and Spectrograph for the VLT
• What stellar orbit is needed to measure the spin of the Galactic center black hole from astrometric data?
• Using the motion of S2 to constrain scalar clouds around SgrA*
• Stellar Distributions Around a Supermassive Black Hole: Strong Segregation Regime Revisited
• The fragmenting past of the disk at the Galactic Center : The culprit for the missing red giants
• Where intermediate-mass black holes could hide in the Galactic Centre: A full parameter study with the S2 orbit
• Clocks around Sgr A*
• Constraining a companion of the galactic center black hole, Sgr A*
• Can fermionic dark matter mimic supermassive black holes?
• Orbital precession of stars in the Galactic center

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• On Equation of State of Dark Matter around Massive Black Holes
• SgrA* spin and mass estimates through the detection of multiple extremely large mass-ratio inspirals
• The effects of the spin and quadrupole moment of SgrA* on the orbits of S stars
• Impact of a granular mass distribution on the orbit of S2 in the Galactic center
• Co-evolution of Nuclear Star Clusters and Massive Black Holes: Extreme Mass-Ratio Inspirals
• Observations of the Fermi bubbles and the Galactic center excess with the DArk Matter Particle Explorer
• Constraints on a fifth force from the stellar orbits around the central supermassive black hole of the Milky Way
• The gas streamer G1-2-3 in the Galactic Center
• Mass and spin coevolution of black holes inspiralling through dark matter
• PPN--spin degeneracies in mock S62-like stellar-orbit inference
• How to Build an Empirical Speed Distribution for Dark Matter in the Solar Neighborhood
• Timing Gravity with Pulsars in the Strong Field
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