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Evaluate the reliability of high radial velocity detections in the Gaia DR3 catalog and determine the orbital dynamics and origins of validated fast-moving stars.

November 6, 2025Astronomy and AstrophysicsOpen Access

Gaia DR3 high radial velocity stars: Genuine fast-moving objects or outliers?

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Authors

DKD. Katz AGA. E. Gómez ECE. Caffau

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Overview

Spectroscopic analysis reveals an 83% outlier rate among low-signal high radial velocity stars in Gaia DR3, indicating most genuine fast-moving stars originated from past galactic mergers.

Key Points

Evaluate the reliability of high radial velocity detections in the Gaia DR3 catalog and determine the orbital dynamics and origins of validated fast-moving stars.
Observed 134 Gaia DR3 stars with extreme radial velocities (|v_rad| > 500 km s⁻¹) using the SOPHIE and UVES high-resolution spectrographs.
Combined observational results with archival data from APOGEE, GALAH, GES, LAMOST, and RAVE to calculate spurious velocity rates across signal-to-noise and velocity intervals.
Modeled the orbits of a confirmed, high-confidence sample within an axisymmetric Galactic gravitational potential.
Confirmed the radial velocities of 104 stars and refuted 30 out of 134 observed targets.
Identified an outlier rate reaching up to 83% in the lowest signal-to-noise bin (S/N 2–3) for velocities between 400 and 1000 km s⁻¹, with error rates falling rapidly at higher S/N and lower speeds.
Found that the majority of confirmed high radial velocity stars travel on retrograde orbits dynamically linked to ancient merger remnants, confirming an accreted origin.

Cite This Study

Katz et al. (2025) studied this question.

synapsesocial.com/papers/6a6f236bac440176ef27da2f https://doi.org/10.1051/0004-6361/202556602

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November 6, 2025Astronomy and AstrophysicsOpen Access

Gaia DR3 high radial velocity stars: Genuine fast-moving objects or outliers?

View Full Paper

Ask AI

Bookmark

Authors

DKD. Katz AGA. E. Gómez ECE. Caffau

Discussion

Member takes

Overview

Spectroscopic analysis reveals an 83% outlier rate among low-signal high radial velocity stars in Gaia DR3, indicating most genuine fast-moving stars originated from past galactic mergers.

Key Points

Evaluate the reliability of high radial velocity detections in the Gaia DR3 catalog and determine the orbital dynamics and origins of validated fast-moving stars.
Observed 134 Gaia DR3 stars with extreme radial velocities (|v_rad| > 500 km s⁻¹) using the SOPHIE and UVES high-resolution spectrographs.
Combined observational results with archival data from APOGEE, GALAH, GES, LAMOST, and RAVE to calculate spurious velocity rates across signal-to-noise and velocity intervals.
Modeled the orbits of a confirmed, high-confidence sample within an axisymmetric Galactic gravitational potential.
Confirmed the radial velocities of 104 stars and refuted 30 out of 134 observed targets.
Identified an outlier rate reaching up to 83% in the lowest signal-to-noise bin (S/N 2–3) for velocities between 400 and 1000 km s⁻¹, with error rates falling rapidly at higher S/N and lower speeds.
Found that the majority of confirmed high radial velocity stars travel on retrograde orbits dynamically linked to ancient merger remnants, confirming an accreted origin.

Cite This Study

Katz et al. (2025) studied this question.

synapsesocial.com/papers/6a6f236bac440176ef27da2f https://doi.org/10.1051/0004-6361/202556602

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