J/A+A/705/A139ivo://CDS.VizieR/J/A+A/705/A139CDSSun M.Le H.Epinat B.Boselli A.Luo R.Hosogi K.Pichette N.,Forman W.Sarazin C.Fossati M.Chen H.Hensler G.Sarpa E.,Amram P.Braine J.Cuillandre J.C.Gwyn S.Martocchia S.,Vollmer B.2026-03-02T06:25:50Z2026-01-13T08:22:08ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frgalaxiesastrometryspectroscopyvisible-astronomyradial-velocityGalaxies fly inside galaxy clusters and ram pressure by the intracluster medium (ICM) can remove a large amount of the interstellar medium (ISM) from the galaxy, and deposit the gas in the ICM. The ISM decoupled from the host galaxy leaves a long trail following the moving galaxy. Such long trails track the galaxy motion and can be detected with sensitive data in H{alpha}. We study the H{alpha} tail trailing NGC 4569 in the Virgo cluster. Methods. The initial discovery was made with the deep H{alpha} imaging data with CFHT, from the VESTIGE project. The follow-up spectroscopic observations were made with APO/DIS, MMT/Binospec and CFHT/SITELLE. Besides the known 80kpc H{alpha} tail downstream of NGC 4569, the deep H{alpha} imaging data allow the H{alpha} tail detected to at least 230 kpc from the galaxy. More importantly, the H{alpha} clumps implied from the imaging data are confirmed with the spectroscopic data. The H{alpha} clumps show a smooth radial velocity gradient across ~1300km/s, eventually reaching the velocity of the cluster. This discovery, for the first time, demonstrates the full deceleration process of the stripped ISM. This discovery also showcases the potential with wide-field H{alpha} survey on galaxy clusters to discover intracluster optical emission-line clouds originated from cluster galaxies. These clouds provide kinematic tracers to the infall history of cluster galaxies and the turbulence in the ICM. They are also excellent multi-phase objects to study the classical cloud crushing problem and other relevant important physical processes.2026A&A...705A.139Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/705/A139CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/635/A135 : Galaxies around M87 (Kashibadze+, 2020)J/A+A/587/A68 : Ionised gas images of NGC 4569 (Boselli+, 2016)J/A+A/570/A69 : GALEX Ultraviolet Virgo Cluster Survey. IV. (Boselli+, 2014)J/MNRAS/413/813 : ATLAS3D project. I. (Cappellari+, 2011)J/ApJ/655/144 : ACS Virgo Cluster Survey. XIII. (Mei+, 2007)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/705/A139https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/705/A139http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/705/A139https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/705/A139https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/705/A139http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/705/A139GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/705/A139/binospec (Velocity values and line ratios for 94 Halpha clumps from the Binospec data)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/705/A139/binospec?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/705/A139/binospec?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/705/A139/binospec?GETtext/xml+votable180.050000true189.129460413.23878280.005555555555555556Cone search capability for table J/A+A/705/A139/sitelle (Velocity values from the SITELLE data)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/705/A139/sitelle?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/705/A139/sitelle?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/705/A139/sitelle?GETtext/xml+votable180.050000true189.1161813.10110.0055555555555555566/27936-27937https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/705/A139?format=asciiOpticaldefaultJ/A+A/705/A139/binospecVelocity values and line ratios for 94 Halpha clumps from the Binospec datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension (J2000) (RA)degpos.eq.ra;meta.mainDEJ2000Declination (J2000) (DEC)degpos.eq.dec;meta.mainRVBarycentric velocity (VEL)km/sspect.dopplerVeloc;obsinte_RVBarycentric velocity 1-sigma error (VEL_E)km/sstat.errorintNII/Ha? The NII at 6584{AA} to H{alpha} emission line ratio (Ratio1)spect.line.intensity;arith.ratio;obsfloatnullablee_NII/Ha? The 1-{sigma} error of NII/Ha (Ratio1_E)stat.errorfloatnullableSII/Ha? The SII at 6717{AA} and 6731{AA} to Halpha emission line ratio (Ratio2)spect.line.intensity;arith.ratio;obsfloatnullablee_SII/Ha? The 1-{sigma} error of SII/Ha (Ratio2_E)stat.errorfloatnullableJ/A+A/705/A139/sitelleVelocity values from the SITELLE datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension (J2000) (RA)degpos.eq.ra;meta.mainDEJ2000Declination (J2000) (DEC)degpos.eq.dec;meta.mainRVBarycentric velocity (VEL)km/sspect.dopplerVeloc;obsfloatSNRSignal-to-Noise ratio of the H{alpha} line (SNR)stat.snr;spect.linefloat