J/AJ/167/76 Catalog of 519 high velocity stars (HiVels) (Liao+, 2024)
The Origin of High-velocity Stars Considering the Impact of the Large Magellanic
Cloud.
Liao J., Du C., Deng M., Ye D., Li H., Huang Y., Shi J., Ma J.
<Astron. J., 167, 76 (2024)>
=2024AJ....167...76L 2024AJ....167...76L
ADC_Keywords: Stars, high-velocity; Cross identifications; Proper motions;
Parallaxes, trigonometric; Radial velocities; Abundances, [Fe/H]
Keywords: High-velocity stars ; Stellar kinematics ; Stellar dynamics ;
Sagittarius dwarf spheroidal galaxy ; Large Magellanic Cloud
Abstract:
Utilizing astrometric parameters sourced from Gaia Data Release 3 and
radial velocities obtained from various spectroscopic surveys, we
identify 519 high-velocity stars (HiVels) with a total velocity in the
Galactocentric rest frame greater than 70% of their local escape
velocity under the Gala MilkyWayPotential. Our analysis reveals that
the majority of these HiVels are metal-poor late-type giants, and we
show nine HiVels that are unbound candidates to the Galaxy with escape
probabilities of 50%. To investigate the origins of these HiVels, we
classify them into four categories and consider the impact of the
Large Magellanic Cloud (LMC) potential on their backward- integration
trajectories. Specifically, we find that one of the HiVels can track
back to the Galactic center, and three HiVels may originate from the
Sagittarius dwarf spheroidal galaxy (Sgr dSph). Furthermore, some
HiVels appear to be ejected from the Galactic disk, while others
formed within the Milky Way or have an extragalactic origin. Given
that the LMC has a significant impact on the orbits of Sgr dSph, we
examine the reported HiVels that originate from the Sgr dSph, with a
few of them passing within the half-light radius of the Sgr dSph.
Description:
In this study, we identify a total of 519 HiVels through a
cross-matching process between the Gaia DR3 and other large-scale
Galactic surveys.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table6.dat 807 519 Catalog of 519 HiVels considering the impact of the
Large Magellanic Cloud
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See also:
I/352 : Distances to 1.47 billion stars in Gaia EDR3 (Bailer-Jones+, 2021)
I/354 : StarHorse2, Gaia EDR3 photo-astrometric distances (Anders+, 2022)
J/AJ/144/4 : Props of dwarf galaxies in Local Group (McConnachie+, 2012)
J/MNRAS/490/3508 : The Southern Stellar Stream Sp. Survey (S5) (Li+, 2019)
J/MNRAS/484/2832 : Proper motions of Milky Way glob clusters (Vasiliev, 2019)
J/ApJ/886/154 : Sgr stream K- & M-giants and BHB stars (Yang+, 2019)
J/MNRAS/506/150 : The GALAH+ Survey DR3 (Buder+, 2021)
J/ApJS/252/3 : High-veloc * in the Gal. halo from LAMOST & Gaia (Li+, 2021)
J/MNRAS/505/5978 : Gaia EDR3 view Galactic globular clusters (Vasiliev+, 2021)
J/MNRAS/501/2279 : Stars in the Sagittarius stream (Vasiliev+, 2021)
J/AJ/166/12 : Velocity data for 88 very high velocity stars (Li+, 2023)
Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 28 A28 --- Gaia Unique source designation, Gaia DR3
30- 48 F19.15 deg RAdeg [0/360] Gaia DR3 Right ascension,
(ICRS at Epoch=2016.0)
50- 68 F19.15 deg DEdeg [-80/79] Gaia DR3 Declination
(ICRS at Epoch=2016.0)
70- 86 F17.15 mas plx [0.03/3.4] Parallax, Gaia DR3
88- 99 F12.10 mas e_plx [0.009/0.04] Error on plx
101-109 F9.6 mas plx-zp [-0.07/-0.001] Parallax zero-point
correction, after
Lindegren+, 2021A&A...649A...4L 2021A&A...649A...4L
111-130 F20.15 mas.yr-1 pmRA [-152/224] Proper motion in right
ascension direction, Gaia DR3
132-143 F12.10 mas.yr-1 e_pmRA [0.006/0.04] Error of pmRA
145-164 F20.15 mas.yr-1 pmDE [-290/175] Proper motion in
declination direction, Gaia DR3
166-177 F12.10 mas.yr-1 e_pmDE [0.007/0.04] Error of pmDE
179-192 F14.11 --- plx-pmra-corr [-0.53/0.66] Correlation between
parallax and proper motion in
right ascension , Gaia DR3
194-207 F14.11 --- plx-pmdec-corr [-0.59/0.61] Correlation between
parallax and proper motion in
declination , Gaia DR3
209-222 F14.11 --- pmra_pmdec-corr [-0.7/0.7] Correlation between
proper motion in right ascension
and in declination , Gaia DR3
224-233 F10.8 --- ruwe [0.77/1.4] Renormalised unit
weight error, Gaia DR3
235-244 F10.7 mag Gmag [8.58/15] G-band mean magnitude,
Gaia DR3
246-257 F12.9 mag BP-RP [-0.08/2.71] BP-RP color, Gaia DR3
259-279 A21 --- crossmatch-survey Cross-match the name of survey id
281-300 A20 --- surveyid Unique ID in the survey
302-318 F17.11 K Teff [3743/18453]? Effective temperature
the cross-match survey
320-337 F18.13 K e_Teff [8/1028]? Error of Teff
339-348 F10.8 [cm/s2] logg [0.44/4.86]? Surface gravity, log,
the cross-match survey
350-366 F17.15 [cm/s2] e_logg [0.01/0.6]? Error of logg
368-378 F11.8 [-] [Fe/H] [-2.54/0.16]? Metallicity,
the cross-match survey
380-396 F17.15 [-] e_[Fe/H] [0.009/0.5]? Error on metallicity
398-415 F18.15 [-] a/FeH [-0.49/0.57]? Alpha abundance, the
cross-match survey
417-433 F17.15 [-] e_a/FeH [0.001/0.2]? Error of a/FeH
435-454 F20.15 km.s-1 RVel [-487/605] Weighted mean radial
velocity, Equation 1
456-472 F17.15 km.s-1 e_RVel [0.03/8] Error of radial velocity
474-493 A20 --- GGDrlen Corresponding to L in equation 2,
after Bailer-Jones+, 2021, I/352
495-511 F17.15 --- GGDalpha [0.17/2.8] Corresponding to alpha
in equation 2, after
Bailer-Jones+, 2021, I/352
513-529 F17.15 --- GGDbeta [0.12/7.41] Corresponding to beta
in equation 2, after
Bailer-Jones+, 2021, I/352
531-548 F18.15 kpc Dist [0.29/16.5] Heliocentric distance
(1)
550-567 F18.15 kpc e_Dist [0.2/15] Lower uncertainty on Dist
569-586 F18.15 kpc E_Dist [0.2/20] Upper uncertainty on Dist
588-604 F17.14 kpc RGC [2.06/19.6] Galactocentric
distance (1)
606-622 F17.14 kpc e_RGC [1/18] Lower uncertainty on RGC
624-640 F17.14 kpc E_RGC [2.59/21.7] Upper uncertainty on
RGC
642-657 F16.12 km.s-1 VGC [334/685] Galactocentric total
velocity (1)
659-674 F16.12 km.s-1 e_VGC [280/608] Lower uncertainty on VGC
676-691 F16.12 km.s-1 E_VGC [343/836] Upper uncertainty on VGC
693-712 F20.15 km.s-1 Vphi [-498/593] Rotation velocity,
this work
714-719 F6.4 --- P-ub [0/0.97] Unbound possibility,
this work
721-737 F17.15 --- P-disk [0/1] Probablity of the star
tracking back to the disk,
this work
739-755 F17.15 --- P-sgr [0/1] Probablity of the star
tracking back to the Sgr,
this work
757-769 A13 --- var-flag Flag indicating if variability was
identified in the photometric data
771-780 F10.8 --- Pstar [0.99/1] Probability from
DSC-Combmod of being a single star
782-795 F14.9 km.s-1 RVel-DR3 [-487/606] Gaia DR3 radial velocity
797-807 F11.8 km.s-1 e_RVel-DR3 [0.1/34] Error of RVel-DR3
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Note (1): Derived adopting the same method as Du+, 2019ApJS..244....4D 2019ApJS..244....4D.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 29-Apr-2024