J/MNRAS/532/322ivo://CDS.VizieR/J/MNRAS/532/322CDSHota S.Subramaniam A.Dhanush S.R.Cioni M.-R.L.Subramanian S.2025-09-02T11:47:38Z2025-09-01T14:58:49ZCDS support team

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

cds-question@unistra.frultraviolet-astronomygalaxiesphotometryvisible-astronomydwarf-galaxiesmagellanic-cloudsThe interactions between the Magellanic Clouds significantly affect the shape and distribution of the young stellar population, particularly in the periphery of the Small Magellanic Cloud (SMC). We present the first far-UV (FUV) map of the north-east SMC-Shell region using the Ultra Violet Imaging Telescope (UVIT) onboard AstroSat. The detected FUV stars are combined with Gaia Early Data Release 3 data to create a FUV-optical catalogue of ~14400 stars. FUV-optical colour-magnitude diagrams are used along with isochrones to estimate the stellar ages. The detected stars are formed in multiple episodes. We identified two episodes of star formation (~60 and ~260Myr ago), where the episode at ~260Myr is linked to the recent interaction with the Large Magellanic Cloud (LMC) and the episode at ~60Myr is linked to the pericentric passage of the SMC around our Galaxy. The median proper motion (PM) and velocity dispersion are found to be similar to the SMC main body, indicating that this region has not experienced significant tidal effects. The FUV stellar surface density and the dispersion in PM suggest that the extent of the inner SMC in the north-east direction to be around 2.2{deg}. We detect arm-like and arc-like structures in the FUV stellar density map, and their kinematics appear to be similar to the SMC main body. These extended outer features are the spatial stellar overdensities formed over multiple episodes of star formation, but without apparent kinematic distinction.2024MNRAS.532..322Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/532/322CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/375 : VISTA Magellanic Survey (VMC) cat. (YJKs) DR6 (Cioni+, 2011)I/350 : Gaia EDR3 (Gaia Collaboration, 2020)I/357 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)J/AJ/113/1011 : UV Observations of the SMC (Cornett+ 1997)J/AJ/127/1531 : Star formation history of SMC (Harris+, 2004)J/AJ/140/416 : IR photometry of massive stars in the SMC (Bonanos+, 2010)J/A+A/517/A50 : Ages & lum. of young SMC/LMC star clusters (Glatt+, 2010)J/other/Sci/337.444 : RV curves of Galactic massive O stars (Sana+, 2012)J/ApJS/213/34 : Veloc. of Cygnus OB2 massive binaries (Kobulnicky+, 2014)J/ApJS/215/15 : SMaSH+: observations and companion detection (Sana+, 2014)J/MNRAS/449/639 : VMC survey. XIV. SFR in SMC (Rubele+, 2015)J/A+A/591/A11 : SMC BV photometry of 9 star cluster fields (Dias+, 2016)J/ApJ/816/49 : Spitzer/IRAC observations of SMC Cepheids (Scowcroft+, 2016)J/AJ/154/199 : SMASH: Survey of MAgellanic Stellar History (Nidever+, 2017)J/MNRAS/472/808 : YJKs light curves of SMC Classical Cepheids (Ripepi+, 2017)J/A+A/616/A187 : SMC clusters age-dating & classification (Nayak+, 2018)J/A+A/628/A51 : Magellanic Clouds reddening map (Joshi+, 2019)J/ApJ/887/267 : OB stars embedded in the HI gas of SMC (Murray+, 2019)J/MNRAS/495/98 : Tidal scars of the Small Magellanic Cloud (De Leo+, 2020)J/ApJ/904/13 : RVel for 10 giant eclipsing binaries (Graczyk+, 2020)J/ApJS/247/47 : UV survey of M31 with UVIT on AstroSat (Leahy+, 2020)J/A+A/649/A7 : MC structure and properties (Gaia Collaboration+, 2021)J/AJ/161/74 : SMASH DR2. 197 SMASH fields (Nidever+, 2021)J/MNRAS/502/2859 : The VMC survey XLI - PMs within the SMC (Niederhofer+, 2021)J/MNRAS/504/2983 : Reddening of SMC red clump stars (Tatton+, 2021)J/MNRAS/513/5847 : Red supergiants in binary systems. I. SMC (Patrick+, 2022)J/ApJ/946/65 : AstroSat/UVIT obs. SMC: point-source cat. (Devaraj+, 2023)J/A+A/672/A65 : Clean SMC stellar samples (Jimenez-Arranz+, 2023)J/A+A/690/A289 : Binarity at LOw Metallicity (BLOeM). I. (Shenar+, 2024)J/ApJS/275/34 : UVIT DR1, comprehensive catalog of UVIT obs. (Piridi+, 2024)http://astrobrowse.issdc.gov.in/astro_archive/archive/Home.jsp : ISRO Sciencehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/532/322https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/532/322http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/532/322https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/532/322https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/532/322http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/532/322GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/532/322/table2 (UV catalogue of the SMC-Shell region)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/532/322/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/532/322/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/532/322/table2?GETtext/xml+votable180.050000true18.12019792-70.857945560.0055555555555555565/8332 6/33307 333361.1482978565343782e-18 1.5339351055263043e-18https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/532/322?format=asciiUVOpticaldefaultJ/MNRAS/532/322/table2UV catalogue of the SMC-Shell regionrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[0/14439] Running sequence numbermeta.idintGaiaEDR3Gaia EDR3 source identifier (Source_id)meta.id;meta.mainRA_ICRS[13.9/19.8] Right ascension (ICRS)degpos.eq.ra;meta.mainindexedDE_ICRS[-72/-70.2] Declination (ICRS)degpos.eq.dec;meta.mainindexedFUVmag[13.9/22.6]? FUV (148nm) AB magnitudemagphot.mag;em.UV.100-200nmfloatnullablee_FUVmag[0.01/0.2] Uncertainty in FUVmagmagstat.error;phot.mag;em.UV.100-200nmfloat