~17000 runaways stars from the Orion Nebula Cluster J/ApJ/900/14 ivo://CDS.VizieR/J/ApJ/900/14 doi:10.26093/cds/vizier.19000014 CDS Farias J.P. Tan J.C. Eyer L. 2022-03-14T08:53:06Z 2021-11-12T07:10:38Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr open-star-clusters astrometry radial-velocity We use Gaia DR2 to hunt for runaway stars from the Orion Nebula Cluster (ONC). We search a region extending 45{deg} around the ONC and out to 1 kpc to find sources that have overlapped in angular position with the cluster in the last ~10Myr. We find ~17000 runaway/walkaway candidates that satisfy this 2D traceback condition. Most of these are expected to be contaminants, e.g., caused by Galactic streaming motions of stars at different distances. We thus examine six further tests to help identify real runaways, namely: (1) possessing young stellar object (YSO) colors and magnitudes based on Gaia optical photometry; (2) having IR excess consistent with YSOs based on 2MASS and Wide-field Infrared Survey Explorer photometry; (3) having a high degree of optical variability; (4) having closest approach distances well-constrained to within the cluster half-mass radius; (5) having ejection directions that avoid the main Galactic streaming contamination zone; and (6) having a required radial velocity (RV) for 3D overlap of reasonable magnitude (or, for the 7% of candidates with measured RVs, satisfying 3D traceback). Thirteen sources, not previously noted as Orion members, pass all these tests, while another twelve are similarly promising, except they are in the main Galactic streaming contamination zone. Among these 25 ejection candidates, ten with measured RVs pass the most restrictive 3D traceback condition. We present full lists of runaway/walkaway candidates, estimate the high-velocity population ejected from the ONC, and discuss its implications for cluster formation theories via comparison with numerical simulations. 2020ApJ...900...14F https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/900/14 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to II/332 : c2d Spitzer final data release (DR4) (Evans+, 2003) I/337 : Gaia DR1 (Gaia Collaboration, 2016) I/345 : Gaia DR2 (Gaia Collaboration, 2018) I/347 : Distances to 1.33 billion stars in Gaia DR2 (Bailer-Jones+, 2018) II/360 : Gaia DR2 x AllWISE catalogue (Marton+, 2019) J/AcA/48/35 : All Sky Automated Survey variable stars (Pojmamski 1998) J/AJ/119/3026 : Circumstellar disk candidates in Orion (Rebull+, 2000) J/A+A/502/883 : photometry very low mass ONC stars (Rodriguez-Ledesma+, 2009) J/ApJ/722/1092 : Optical photometry of the ONC. II. (Da Rio+, 2010) J/AJ/144/192 : Spitzer survey of Orion A & B. I. YSO catalog (Megeath+, 2012) J/ApJS/209/32 : Probable young stars in the MYStIX project (Broos+, 2013) J/ApJ/818/59 : IN-SYNC. IV. YSOs in Orion A (Da Rio+, 2016) J/ApJS/229/28 : SFiNCs: X-ray, IR and membership catalogs (Getman+, 2017) J/AJ/156/84 : APOGEE-2 survey of Orion Complex. II. (Kounkel+, 2018) J/AJ/156/271 : The stellar membership of the Taurus SFR (Luhman, 2018) J/A+A/620/A172 : Solar neighbourhood young stars 3D mapping (Zari+, 2018) J/A+A/627/A57 : ONC binary and triple stars (Jerabkova+, 2019) J/AJ/157/109 : Stellar proper motions in the Orion Nebula Cluster (Kim+,2019) J/ApJ/870/32 : Kinematics in young star clusters & associations (Kuhn+, 2019) J/ApJ/884/6 : Known members of Orion A with Gaia DR2 data (McBride+, 2019) https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/900/14 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/900/14 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/900/14 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/900/14 https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/900/14 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/900/14 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/ApJ/900/14/table4 (Full ONC's runaway candidates traced back in 2D) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/900/14/table4? https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/900/14/table4? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/900/14/table4? 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39859-39861 39863 39872-39873 39888 39890-39891 39893-39895 39897-39899 39903 39920 39923-39925 39927-39929 39931 39933 40449-40451 40454 40456-40458 40462 40472-40473 40479-40480 40482 40485-40488 40491 40493 40495-40497 40499-40500 40502-40503 40507 40510-40511 40544 40547 40550-40551 40553 40555 40559 40568 40570-40571 40578 40583-40586 40590 40592 40598 40610-40611 40614 40616-40618 40622-40624 40626 40629 40631 40634-40636 40638 40642 40644-40645 40647 40650 40652-40653 40657 40659 40680 40683 40687 40690-40692 40696 40699 40701-40702 40843 40871 40875 40888 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/900/14?format=ascii default J/ApJ/900/14/table4 Full ONC's runaway candidates traced back in 2D e_dmin3D [0.5/91]? Uncertainty in dmin3D pc stat.error double nullable recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int Gaia Gaia DR2 source identifier meta.id;meta.main Label Source label and score; see Sec. 5.1 meta.code char GLON [160/258] Gaia DR2 Galactic longitude (J2015.5) deg pos.galactic.lon indexed GLAT [-64.3/24.6] Gaia DR2 Galactic latitude (J2015.5) deg pos.galactic.lat indexed dONC [0.36/738] 3D distance to the ONC pc pos.distance double theta [0.002/45.2] Angular distance to the ONC deg pos.angDistance double vt0 [0.06/605] Transverse velocity in the ONC frame km/s phys.veloc.transverse double tback [0.001/40.7] 2D traceback time Myr time.epoch double vrOpt [-160584/53149] Median optimal radial velocity km/s phys.veloc;pos.heliocentric double b_vrOpt [-161544/30219] The 16th percentile uncertainty in vrOpt km/s stat.error double B_vrOpt [-159682/118973] The 84th percentile uncertainty in vrOpt km/s stat.error double RVel [-133/296]? Gaia DR2 radial velocity km/s phys.veloc;pos.heliocentric double nullable e_RVel [0.1/18]? Uncertainty in RVel km/s stat.error;spect.dopplerVeloc double nullable Vi [-0.91/5.45]? Intrinsic variability; see Sec. 4.3 meta.code;src.var double nullable Dmin [0.001/68.2] Closest approach ONC; 2D traceback arcmin phys.angSize;src double e_Dmin [0.01/852] Uncertainty in Dmin arcmin stat.error double PA [0.08/360] Position Angle from the ONC deg pos.posAng double R [0.114/0.95]? Probability being real source (1) stat.fit.goodness double nullable SY [0/1]? YSO proba. using 2 AllWISE bands (1) stat.fit.goodness double nullable LY [0/1]? YSO proba. using 4 AllWISE bands (1) stat.fit.goodness double nullable d [6.42/1000] Gaia DR2 parallax distance pc pos.distance double E_d [6.42/1245] Upper uncertainty in d pc stat.error;stat.max double e_d [6.41/982] Lower uncertainty in d pc stat.error double v3DONC [2.57/410]? Space velocity in ONC frame of reference km/s phys.veloc double nullable tback3D [-26.9/19.4]? 3D traceback time Myr time.epoch double nullable e_tback3D [0.003/11]? Uncertainty in tback3D Myr stat.error double nullable dmin3D [0.2/641]? Closest approach to ONC 3D traceback pc pos.distance double nullable YSOFlag [-1/1] YSO flag: +1 pass, -1 fail meta.code int WYSOFlag [-1/1] WYSO flag: +1 pass, -1 fail, 0 not evaluated meta.code int VARFlag [-1/1] VAR flag: +1 pass, -1 fail, 0 not evaluated meta.code int CAFlag [-1/1] CA flag: +1 pass, -1 fail meta.code int PAFlag [-1/1] PA flag: +1 pass, -1 fail meta.code int RVFlag [-1/1] RV flag: +1 pass, -1 fail meta.code int _RA.icrs Right ascension (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) deg pos.eq.ra nullable indexed _DE.icrs Declination (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) deg pos.eq.dec nullable indexed