J/ApJS/244/5ivo://CDS.VizieR/J/ApJS/244/5doi:10.26093/cds/vizier.22440005CDSSriram K.Malu S.Choi C.S.2020-04-30T07:57:57Z2020-03-05T08:16:13ZCDS support team

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

cds-question@unistra.frx-ray-binary-starsx-ray-sourcesNeutron star Z-type sources provide a unique platform in order to understand the structure of accretion disk-corona geometry emitting close to the Eddington luminosity. Using RXTE and Nuclear Spectroscopic Telescope Array Mission (NuSTAR) satellite data, we performed crosscorrelation function (CCF) studies in GX 17+2 in order to constrain the size of the corona responsible for hard X-rays. From the RXTE data, we found that during horizontal and normal branches, the CCFs show anticorrelated hard (16-30keV) and soft (2-5keV) X-ray delays of the order of a few tens to hundred seconds with a mean correlation coefficient of 0.42+/-0.11. Few observations shows correlated lags and, on one occasion, coincident with radio emission. We also report an anticorrelated hard X-ray delay of 113+/-51s using the NuSTAR data of GX 17+2. Based on RXTE data, we find that soft and hard X-ray fluxes are varying, indicating the changes in the disk-corona structure during delays. We bridle the size of the corona using relativistic precession, transition layer models, and boundary layer models. Assuming the delays to be a readjustment timescale of the disk-corona structure, the height of the corona was estimated to be ~17-100km. Assuming that the inner region of the truncated disk is occupied by the corona, we constrain the coronal readjustment velocities (v_corona_={beta}v_disk_, where v_disk_ is the radial velocity component of the disk) of the order of {beta}=0.06-0.12. This study indicates that the observed delays are primarily dependent on the varying coronal readjustment velocities.2019ApJS..244....5Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/244/5CatalogResearchIsServedByTAP VizieR generic servicerelated-toB/cb : Cataclysmic Binaries, LMXBs, and related objects (Ritter+, 2004)V/106 : Catalogue of X-ray binaries (Liu+, 2001)J/A+A/281/161 : Radio emission from stars at 250GHz (Altenhoff+, 1994)J/A+A/411/L59 : INTEGRAL reference catalog (Ebisawa+, 2003)J/A+A/458/21 : INTEGRAL burst observations of 4U 1728-34 (Falanga+, 2006)J/ApJS/179/360 : Thermonuclear X-ray bursts observed by RXTE (Galloway+, 2008)J/ApJS/186/1 : The 4th IBIS/ISGRI soft gamma-ray survey catalog (Bird+, 2010)J/A+A/522/A68 : Variable sources detected by INTEGRAL (Telezhinsky+, 2010)J/AJ/141/129 : Chandra Transmission Grating Data Cat. (Huenemoerder+, 2011)J/PAZh/37/651 : Hard X-ray bursts by INTEGRAL in 2003-2009 (Chelovekov+, 2011)J/AJ/146/60 : X-ray variability in 4U 1735-44 (Lei+, 2013)J/ApJS/209/14 : The Swift/BAT hard X-ray transient monitor (Krimm+, 2013)J/BaltA/24/395 : X-ray and radio sources in binaries (Malkov+, 2015)J/other/NewA/47.81 : Distances of X-ray binaries (Islam+, 2016)J/ApJS/223/15 : 8yr INTEGRAL/IBIS soft gamma-ray source obs. (Bird+, 2016)J/A+A/606/A130 : List of 1254 X-ray bursts (in't+, 2017)J/ApJS/235/4 : The 105-month Swift-BAT all-sky hard X-ray survey (Oh+, 2018)J/A+A/625/A122 : CIELO-RGS, soft X-ray ionized emission lines cat. (Mao+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/244/5https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/244/5http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/244/5https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/244/5https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/244/5http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/244/5GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapX-raydefaultJ/ApJS/244/5/table1Cross correlation functions of GX 17+2 using 2-5keV (Soft) and 16-30keV (Hard) background-subtracted 32s bin RXTE PCA light curvesLag[-692/1507]? Lagstime.intervaldoublenullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintObsIDObservation identifiermeta.id;obs.param;obscharSecLight curve section identifiermeta.notecharStartObservation Start, UT datestime.start;obsnullableEndObservation Stop, UT datestime.end;obsnullableTexp[533/42117] Total exposure timestime.duration;obs.exposureintCC[-0.8/1]? Cross-correlation coefficientstat.correlationfloatnullablee_CC[0.008/0.3]? Uncertainty in CCstat.errorfloatnullableHR1[0.01/0.06] Hardness Ratiophot.flux;arith.ratiofloatHR2[0.01/0.09] Hardness Ratiophot.flux;arith.ratiofloatHIDPosition in the hardness intensity diagram (HID)meta.notecharB_Lag[-766/1364]? Upper bound on Lagstime.interval;stat.maxdoublenullableb_Lag[-636/1638]? Lower bound on Lagstime.interval;stat.mindoublenullable