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For refcode 1994ApJ...432..518T:
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1994ApJ...432..518T INFRARED IMAGING OF SPIRAL GALAXIES: COLORS AND LUMINOSITY PROFILES DONALD M. TERNDRUP, ROGER L. DAVIES, JAY A. FROGEL, D. L. DEPOY, AND LISA A. WELLS Received 1993 December 29; accepted 1994 March 17 ABSTRACT We present surface photometry of 43 S0 and spiral galaxies in the K band with a subset also observed in J. Most of the data are photometrically calibrated. We combine our data with published optical major-axis profiles to construct a set of galaxies with rJK colors, divide the major-axis profiles into bulge-dominated and disk-dominated regions, and compute mean colors and color gradients separately for bulges and disks. Typically the disk colors are measured from 0.8 to 1.8 scale lengths. The colors of the bulge and disk components are strongly correlated, indicating that both components have a red stellar content that is similar in both age and metallicity. In the mean the disks are 0.1 mag bluer in r -K than bulges; this color difference would arise if the disks are 2-4 x 10^9^ yr younger or have lower metallicities by {DELTA}[Fe/H] ~ -0.1 to -0.2. Many of the bulges exhibit negative color gradients (bluer outward), which indicate that metallicity gradients of order {DELTA}[Fe/H]~ -0.2 may be common in bulges. Bulges of late-type galaxies are bluer on average than those of early types, probably a consequence of lower metallicity. About 25% of the galaxies have especially red bulge and disk colors, which we interpret as arising from large internal extinction rather than from an enhanced star-formation rate. Subject headings: galaxies: photometry - galaxies: spiral - galaxies: stellar content - galaxies: structure - infrared: galaxies ========================================================================== 1995ApJ...454..945T ERRATUM In the paper Infrared Imaging of Spiral Galaxies: Colors and Luminosity Profiles" by Donald M. Terndrup, Roger L. Davies, Jay A. Frogel, D. L. DePoy, & Lisa A. Wells (ApJ, 432,518 [1994]), there is a calibration error in the surface brightness profiles {mu}(K) and in the calculated r - K colors. The source of the error was an incorrect transformation from mag pixel^-1^ to mag arcsec^-1^. That transformation was applied twice, which made the reported {mu}(K) profiles too faint, and the r - K colors too blue, by 0.65 mag. The J - K colors are unaffected by this error. The error also applies to the determination of the surface brightness of the sky in Section 2.3. This error does not change the main conclusions of the paper. There is an additional error in that the transformation between r - K and (Cousins) R_c_ - K was assumed to be small; in fact, the transformation is R_C_ = r - 0.34, as calculated by R. A. Bell and D. A. VandenBerg (ApJS, 63,335 [1987]). This error affects only the comparison of observed colors to theoretical models (Section 4.1); the match between theory and observation is improved by the use of the correct transformation. Corrected figures and tables are available on request. The authors thank F. Simien and H.-W. Rix for bringing these errors to their attention.
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