Improved constraints on Galactic Centre ejection of hypervelocity stars based on novel search method

ABSTRACT Hypervelocity stars (HVSs) are stars which have been ejected from the Galactic Centre (GC) at velocities of up to a few thousand $\text{km}\, \text{s}^{-1}$. They are tracers of the Galactic potential and can be used to infer properties of the GC, such as the initial mass function and assem...

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Veröffentlicht in:Monthly notices of the Royal Astronomical Society 2024-09, Vol.533 (3), p.2747-2761
Hauptverfasser: Verberne, Sill, Rossi, Elena Maria, Koposov, Sergey E, Marchetti, Tommaso, Kuijken, Konrad, Penoyre, Zephyr, Evans, Fraser A, Souropanis, Dimitris, Tohill, Clár-Bríd
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container_end_page 2761
container_issue 3
container_start_page 2747
container_title Monthly notices of the Royal Astronomical Society
container_volume 533
creator Verberne, Sill
Rossi, Elena Maria
Koposov, Sergey E
Marchetti, Tommaso
Kuijken, Konrad
Penoyre, Zephyr
Evans, Fraser A
Souropanis, Dimitris
Tohill, Clár-Bríd
description ABSTRACT Hypervelocity stars (HVSs) are stars which have been ejected from the Galactic Centre (GC) at velocities of up to a few thousand $\text{km}\, \text{s}^{-1}$. They are tracers of the Galactic potential and can be used to infer properties of the GC, such as the initial mass function and assembly history. HVSs are rare, however, with only about a dozen promising candidates discovered so far. In this work, we make use of a novel, highly efficient method to identify new HVS candidates in Gaia. This method uses the nearly radial trajectories of HVSs to infer their distances and velocities based on their position and Gaia proper motion alone. Through comparison of inferred distances with Gaia parallaxes and photometry, we identified 600 HVS candidates with G < 20 including the previously discovered S5-HVS1, out of which we obtained ground-based follow-up observations for 196 stars. As we found no new HVSs based on their radial velocity, we used detailed HVS ejection simulations to significantly improve previous HVS ejection rate constraints. In particular, the ejection rate of HVSs more massive than 1 $\mathrm{M_\odot }$ cannot be higher than $10^{-5}$ yr$^{-1}$ at $2\sigma$ significance. Additionally, we predict that there are 5–45 unbound HVSs in the complete Gaia catalogue ($1\sigma$ interval), most of which will be main-sequence stars of a few M$_\odot$ at heliocentric distances of tens to hundreds of kpc. By comparing our results to literature HVS candidates, we find an indication of either a time-dependent ejection rate of HVSs or a non-GC origin of previously identified HVS candidates.
doi_str_mv 10.1093/mnras/stae1888
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subjects Constraints
Ejection
Hypervelocity
Identification methods
Initial mass function
Main sequence stars
Radial velocity
title Improved constraints on Galactic Centre ejection of hypervelocity stars based on novel search method
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