J/ApJS/275/5ivo://CDS.VizieR/J/ApJS/275/5doi:10.26093/cds/vizier/bb-8k-5CDSMurray C.E.Lindberg C.W.Yanchulova Merica-Jones P.Williams B.F.,Cohen R.E.Gordon K.D.McQuinn K.B.W.Choi Y.Burhenne C.,Sandstrom K.M.Bot C.Johnson L.C.Goldman S.R.Clark C.J.R.,Roman-Duval J.C.Gilbert K.M.Peek J.E.G.Hirschauer A.S.Boyer M.L.,Dolphin A.E.2026-08-03T07:25:52Z2025-09-23T08:16:33ZCDS support team

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

cds-question@unistra.frmagellanic-cloudshst-photometrysurveysapparent-magnitudeinterstellar-mediuminfrared-astronomyultraviolet-astronomyvisible-astronomyScylla is a deep Hubble Space Telescope (HST) survey of the stellar populations, interstellar medium, and star formation in the LMC and SMC. As a pure-parallel complement to the Ultraviolet Legacy Library of Young Stars as Essential Standards (ULLYSES) survey, Scylla obtained 342 orbits of ultraviolet (UV) through near-IR imaging of the LMC and SMC with Wide Field Camera 3. In this paper, we describe the science objectives, observing strategy, data reduction procedure, and initial results from our photometric analysis of 96 observed fields. Although our observations were constrained by ULLYSES primary exposures, we imaged all fields in at least two filters (F475W and F814W) and 64% of fields in at least three and as many as seven WFC3 filters spanning the UV to IR. Overall, we reach average 50% completeness of m_F225W_=26.0, m_F275W_=26.2, m_F336W_=26.9, m_F475W_=27.8, m_F814W_=25.5, m_F110W_=24.7, and m_F160W_=24.0 Vega mag in our photometric catalogs, which is faintward of the ancient main-sequence turnoff in all filters. The primary science goals of Scylla include characterizing the structure and properties of dust in the MCs, as well as their spatially resolved star formation and chemical enrichment histories. Our images and photometric catalogs, which represent the widest-area coverage of MCs with HST photometry to date, are available as a high-level science product at the Barbara A. Mikulski Archive for Space Telescopes.2024ApJS..275....5Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/275/5CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/375 : VISTA Magellanic Survey (VMC) catalog (YJKs) DR6 (Cioni+, 2011)II/351 : VISTA Magellanic Survey (VMC) catalog (Cioni+, 2011)J/PASP/110/863 : A Stellar Spectral Flux Library: 1150 - 25000 A (Pickles 1998)J/ApJS/197/16 : CO observations of LMC molecular clouds (MAGMA). (Wong+, 2011)J/ApJS/215/9 : PHAT X. UV-IR photometry of M31 stars (Williams+, 2014)J/ApJS/222/11 : Hubble Tarantula Treasury Project (HTTP). III. (Sabbi+, 2016)J/ApJ/816/49 : Spitzer/IRAC observations of SMC Cepheids (Scowcroft+, 2016)J/AJ/154/199 : SMASH: the MAgellanic Stellar History survey (Nidever+, 2017)J/ApJ/871/151 : METAL Hubble program. I. Initial results (Roman-Duval+, 2019)J/AJ/161/74 : SMASH DR2. 197 SMASH fields (Nidever+, 2021)J/ApJS/253/53 : PHATTER. I. HST obs. of stars in M33 (Williams+, 2021)http://archive.stsci.edu/hlsp/scylla : Scylla homepage on MASThttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/275/5https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/275/5http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/275/5https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/275/5https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/275/5http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/275/5GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/275/5/fields (Number of orbits per field (Table 2) and Completness (Table 8))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/275/5/fields?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/275/5/fields?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/275/5/fields?GETtext/xml+votable180.050000true14.939-72.10320.005555555555555556Cone search capability for table J/ApJS/275/5/table5 (*Observing parameters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/275/5/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/275/5/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/275/5/table5?GETtext/xml+votable180.050000true9.5636155-73.4007650.0055555555555555565/8280 6/33047 33051 33076 33079 33091 33094-33096 33101 33103 33106-33107 33112-33113 33115-33116 33126-33127 33295 33297 33299 33304 33306 33316-33317 33328 33330https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/275/5?format=asciiUVOpticalInfrareddefaultJ/ApJS/275/5/fieldsNumber of orbits per field (Table 2) and Completness (Table 8)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameShort Field Name (G1)meta.id;meta.maincharprimaryFieldLong Field Name (G1)obs.fieldcharRAJ2000[9.5/86.6] Average Right Ascension (J2000)degpos.eq.ra;meta.mainDEJ2000[-73.5/-65.5] Average Declination (J2000)degpos.eq.dec;meta.mainNfilt[2/7] Number of filters used in the field's observationsmeta.numberintNorb[2/5] Number of orbits per fieldmeta.numberintCombFilter Combinations; Table 1 (1)meta.codecharNobsNumber of observing parameters for this field (link to Table 5)meta.numberintnullableF225W[25.3/26.4]? Completeness, F225W Vega magnitude (1)magphot.mag;stat.maxfloatnullableF275W[25.1/26.8]? Completeness, F275W Vega magnitude (1)magphot.mag;stat.maxfloatnullableF336W[25.1/27.9]? Completeness, F336W Vega magnitude (1)magphot.mag;stat.maxfloatnullableF475W[26/28.6] Completeness, F475W Vega magnitude (1)magphot.mag;stat.maxfloatF814W[23.5/26] Completeness, F814W Vega magnitude (1)magphot.mag;stat.maxfloatF110W[23.1/25]? Completeness, F110W Vega magnitude (1)magphot.mag;stat.maxfloatnullableF160W[22.6/29.4]? Completeness, F160W Vega magnitude (1)magphot.mag;stat.maxfloatnullableJ/ApJS/275/5/table5*Observing parametersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameShort Field Name (G1)meta.id;meta.maincharFieldLong Field Name (G1)obs.fieldcharRootExposure identifier in MASTmeta.id;obs.exposurecharRAJ2000[9.5/86.6] Observation Right Ascension (J2000)degpos.eq.ra;meta.mainDEJ2000[-73.5/-65.5] Observation Declination (J2000)degpos.eq.dec;meta.mainPA[24.5/349.5] Position Angledegpos.posAngdoubleDetDetector Namemeta.id;instr.detcharFiltFiltermeta.id;instr.filtercharTexp[3/1720] Exposure timestime.duration;obs.exposurefloatpflash[0/8.3]? Post-flash level for the exposurestimefloatnullableJ/ApJS/275/5/table6Summary of artificial star tests (ASTs) for source density-dominated fieldse_Comp[0.001/0.3]? Uncertainty in Comp (1)stat.error;stat.param;phot.magfloatnullableBias[-3.32/2.8]? Bias, Vega magnitude (1)magphot.mag;arith.difffloatnullablee_Bias[0.001/0.9]? Uncertainty in Bias (1)magstat.error;phot.mag;arith.difffloatnullableUnc[0/2]? Uncertainty, Vega magnitude (1)magstat.error;phot.magfloatnullablee_Unc[0.001/0.7]? Uncertainty in Unc (1)magstat.error;stat.error;phot.magfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintl_DensLimit on Source Densitymeta.code.errorcharb_Dens[0/2] Lower bound on Source densitycount.arcsec**-2phys.density;stat.minfloatB_Dens[0.27/2]? Upper bound on Source densitycount.arcsec**-2phys.density;stat.maxfloatnullableFiltFiltermeta.id;instr.filtercharmag[18.25/28.25] Vega magnitude in Filtermagphot.magfloatComp[0.001/1]? Completeness (1)stat.param;phot.magfloatnullableJ/ApJS/275/5/table7Summary of ASTs for background density-dominated fieldsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFiltFiltermeta.id;instr.filtercharb_Dens[0.006/37.1] Lower bound on Source density, sources per arcsec^2count.arcsec**-2phys.density;stat.minfloatB_Dens[5.38/13555] Upper bound on Source density, sources per arcsec^2count.arcsec**-2phys.density;stat.maxdoublemag[18.25/28.25] Vega magnitude in Filtermagphot.magfloatComp[0.002/1]? Completeness (1)stat.param;phot.magfloatnullablee_Comp[0.001/0.4]? Uncertainty in Comp (1)stat.error;stat.param;phot.magfloatnullableBias[-3.4/2]? Bias, Vega magnitude (1)magphot.mag;arith.difffloatnullablee_Bias[0.001/1.4]? Uncertainty in Bias (1)magstat.error;phot.mag;arith.difffloatnullableUnc[0/2.1]? Uncertainty, Vega magnitude (1)magstat.error;phot.magfloatnullablee_Unc[0.001/1.1]? Uncertainty in Unc (1)magstat.error;stat.error;phot.magfloatnullable