J/PASP/119/994ivo://CDS.VizieR/J/PASP/119/994doi:10.26093/cds/vizier.61190994CDSEngelbracht C.W.Blaylock M.Su K.Y.L.Rho J.Rieke G.H.Muzerolle J.,Padgett D.L.Hines D.C.Gordon K.D.Fadda D.Noriega-Crespo A.,Kelly D.M.Latter W.B.Hinz J.L.Misselt K.A.Morrison J.E.,Stansberry J.A.Shupe D.L.Stolovy S.Wheaton W.A.Young E.T.,Neugebauer G.Wachter S.Perez-Gonzalez P.G.Frayer D.T.Marleau F.R.2025-09-09T14:13:19Z2014-09-03T13:19:04ZCDS support team

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

cds-question@unistra.frinfrared-photometrystandard-starsWe present the stellar calibrator sample and the conversion from instrumental to physical units for the 24{mu}m channel of the Multiband Imaging Photometer for Spitzer (MIPS). The primary calibrators are A stars, and the calibration factor based on those stars is 4.54x10^-2^MJy/sr/(DN/s), with a nominal uncertainty of 2%. We discuss the data reduction procedures required to attain this accuracy; without these procedures, the calibration factor obtained using the automated pipeline at the Spitzer Science Center is 1.6%+/-0.6% lower. We extend this work to predict 24{mu}m flux densities for a sample of 238 stars that covers a larger range of flux densities and spectral types. We present a total of 348 measurements of 141 stars at 24{mu}m. This sample covers a factor of ~460 in 24{mu}m flux density, from 8.6mJy up to 4.0Jy. We show that the calibration is linear over that range with respect to target flux and background level. The calibration is based on observations made using 3s exposures; a preliminary analysis shows that the calibration factor may be 1% and 2% lower for 10 and 30s exposures, respectively. We also demonstrate that the calibration is very stable: over the course of the mission, repeated measurements of our routine calibrator, HD 159330, show a rms scatter of only 0.4%. Finally, we show that the point-spread function (PSF) is well measured and allows us to calibrate extended sources accurately; Infrared Astronomy Satellite (IRAS) and MIPS measurements of a sample of nearby galaxies are identical within the uncertainties.2007PASP..119..994Ehttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/PASP/119/994CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/PASP/119/994https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/PASP/119/994http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/PASP/119/994https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/PASP/119/994https://vizier.iucaa.in/viz-bin/votable?-source=J/PASP/119/994http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/PASP/119/994GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/PASP/119/994/table5 (MIPS stellar flux calibrator sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/PASP/119/994/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/PASP/119/994/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/PASP/119/994/table5?GETtext/xml+votable180.050000true280.468300662.96144080.005555555555555556Cone search capability for table J/PASP/119/994/table6 (Combined measurements and calibration factors)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/PASP/119/994/table6?https://vizier.iucaa.in/viz-bin/conesearch/J/PASP/119/994/table6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/PASP/119/994/table6?GETtext/xml+votable180.050000true280.468300662.96144080.0055555555555555566/15 49 737 846 998 1143 1504 2282 2460 2837 2973 3138 4444 4578 4687 4698 4990 5377 5382 5476 5535 5718 6082 6126 6196 6219 6269 6340 6510 6940 7239 7545 7804 8509 8767 8834 8845 9127 9327 9406 9492 9520 9717 10101 10192 10194 10197 10202 10217 10224 10276 10334 10367 11128 11294 11416 11473 11479 11627 11772 12082 12146 12676 12922 13106 13282 13333 13392 14115 14140 14373 14573 14786 15014 15289 15291 15322-15323 15327 15348 15885 16023 16031 16035 16051 16053 16116 16342 16629 16834 18110 18425 18498 19045 19130 19350 19476 20145 20512 20518 20621 20716 20940 20998 21050 22764 22881 23243 23511 23513 23540 23545 23555 24557 24731 24799 25070 25192 25278 25521 25925 26296 26975 27013 27018 27574 27750 27884 28101 28469 28510 28704 28968 29978 30567 30837 30958 31475 31576 31784 32789 32891 33036 33193 33219 33281 33351 33396 33449 33694 33722 33814 33831-33832 33872 34284 34332 34347 34471 35069 35104 35473 35480 36317 36911 36943 37006 37035 37108 37164 37316 37327 37480 37497 37522 37536 37542 37544 37546 37557 37565 37708 37760 38262 38730 38920 38924 38950 39085 39095 39137 39144 39165 39263 39443 39461 39714 40795 40957 41022 41270 41676 41698 41724 41763 41776-41777 41779 41817 42113 42171 42225 42325 42687 42779 42818 43015 43026 43141 43494 43540 44125 44398 44554 45530 46615 46743 47298 47919 48051 48330 48344 483947.945783976041678e-21 1.0188844282367877e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/PASP/119/994?format=asciiInfrareddefaultJ/PASP/119/994/table5MIPS stellar flux calibrator samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCmeta.ref.urlcharSimbadNameSimbad column added by the CDSmeta.idcharnullableF25um? Flux density at 25um (2)Jyphot.flux.density;em.IR.15-30umfloatnullablee_F25um? rms uncertainty on F25umJystat.errorfloatnullableNameNamemeta.id;meta.maincharprimarySpTypeMK spectral typesrc.spTypecharSKmagSUPER-Ks magnitude (1)magphot.mag;em.IR.Kfloate_SKmagrms uncertainty on SUPER-Ks magnitudemagstat.error;phot.magfloatF12um? Flux density at 12um (2)Jyphot.flux.density;em.IR.8-15umfloatnullablee_F12um? rms uncertainty on F12umJystat.errorfloatnullableF24umPredicted flux density at 24um (3)Jyphot.flux.density;em.IR.15-30umdoublee_F24umrms uncertainty on F14umJystat.errorfloatbg24Predicted background level at 24um (sec. 4.3)MJy/srinstr.backgroundfloate_bg24rms uncertainty on bg24MJy/srstat.errorfloat_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainJ/PASP/119/994/table6Combined measurements and calibration factorsfmeta.noteintnullableRmeta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameNamemeta.id;meta.mainchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainSimbadSimbad column added by the CDSmeta.ref.urlcharNm[1/102] Number of measurements (in table2)meta.numberintCR2424um count rate (in DN/s) (1)s**-1phot.countfloate_CR24rms uncertainty on 24um count rate (in DN/s)s**-1stat.errorfloatCFCalibration factor (in MJy/sr/(DN/s))MJy.sr**-1.sarith.factordoublee_CFrms uncertainty on CF (in MJy/sr/(DN/s))MJy.sr**-1.sstat.errordoubleJ/PASP/119/994/table224um measurements of MIPS flux calibratorse_CRrms uncertainty on CR (in DN/s)s**-1stat.errordoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameNamemeta.id;meta.maincharTime[34/11367] Days Since Mission Startdtime.epochfloatAORAOR key (1)meta.id;obsintDCET[3/30] Data collection event time (in this case an individual image)stime.epochintCRCount rate (in DN/s)s**-1phot.countdoublefmeta.noteintnullableJ/PASP/119/994/table3Data used to compute the 24um calibration factorrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameNamemeta.id;meta.maincharKsmagKs or [24] magnitude (1)magphot.mag;em.IR.KfloatCR2424um count rate (in DN/s)s**-1phot.countdoublee_CR24rms uncertainty on 24um count rate (in DN/s)s**-1stat.errordoubleCFCalibration factor (in MJy/sr/(DN/s)) (2)MJy.sr**-1.sarith.factordoublee_CFCalibration factor (in MJy/sr/(DN/s))MJy.sr**-1.sstat.errordoubleJ/PASP/119/994/table7Stars rejected as 24um calibratorsComReason for rejectionmeta.notecharn_Name[abcd] Note (1)meta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameNamemeta.id;meta.mainchar