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J/A+A/598/A119      NGC 5523 H-band image                        (Fulmer+, 2017)

NGC 5523: an isolated product of soft galaxy mergers? Fulmer L.M., Gallagher J.S.III, Kotulla R. <Astron. Astrophys. 598, A119 (2017)> =2017A&A...598A.119F (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, photometry ; Photometry, SDSS ; Morphology Keywords: galaxies: individual: NGC 5523 - galaxies: structure - galaxies: evolution - galaxies: photometry Abstract: Multi-band images of the very isolated spiral galaxy NGC 5523 show a number of unusual features consistent with NGC 5523 having experienced a significant merger: (1) Near-infrared (NIR) images from the Spitzer Space Telescope (SST) and the WIYN 3.5-m Multi-band images of the very isolated spiral galaxy NGC 5523 show a number of unusual features consistent with NGC 5523 having experienced a significant merger: (1) Near-infrared (NIR) images from the Spitzer Space Telescope (SST) and the WIYN 3.5-m telescope reveal a nucleated bulge-like structure embedded in a spiral disk. (2) The bulge is offset by ∼1.8kpc from a brightness minimum at the center of the optically bright inner disk. (3) A tidal stream, possibly associated with an ongoing satellite interaction, extends from the nucleated bulge along the disk. We interpret these properties as the results of one or more non-disruptive mergers between NGC 5523 and companion galaxies or satellites, raising the possibility that some galaxies become isolated because they have merged with former companions. Description: ngc5523ellipseanalysis.fits (ellipse.dat): Output file from the Ellipse analysis described in Tables 2 and 3 and shown in Figure 1(c). Contents for each column may be found at http://stsdas.stsci.edu/cgi-bin/gethelp.cgi?ellipse. The input image for this analysis was a sky-subtracted 3.6-micron Spitzer Space Telescope image of NGC 5523 with a sky value of 0.03. Tables 2 and 3 outline the initial parameters of the Ellipse analysis. ngc5523smaobservedmag.fits (smamag.dat): Data used to make Figure 3, "Observed Magnitude vs. SMA for the inner and outer disks of NGC 5523", based on the Ellipse analysis shown in Figure 1(c). The first three columns (row, SMA, MAG) come directly from the Ellipse analysis output, found in ngc5523ellipseanalysis.fits. The fourth column (OBS_MAG) contains the observed magnitude of NGC 5523 at increasingly large sma, calculated by adding 18.89 to column three (MAG). 18.89 is the conversion factor from absolute magnitude to observed magnitude, based on the distance 20.6Mpc to NGC 5523. ngc5523coloranalysis.fits (color.dat): In performing the color analysis, Ellipse fits were obtained for SDSS g and r images, then colors were calculated as the difference between the g and r AB magnitudes from their respective Ellipse fits. The file ngc5523coloranalysis.fits contains both the Ellipse analysis for the SDSS g image, as well as the (g-r) color analysis. Contents for each column may be found at http://stsdas.stsci.edu/cgi-bin/gethelp.cgi?ellipse. The last column, entitled '(g-r)' contains the color analysis data. ngc5523smagrcolor.fits (smacolor.dat): Data used to make Figure 4, "Color analysis of NGC 5523 from SDSS (g-r) images". The first three columns (row, SMAarcsecg, (g-r)) come directly from the Ellipse and color analyses of SDSS g and r images, found in ngc5523coloranalysis.fits. The fourth column (sma_kpc) contains the conversion of the SMA of NGC 5523 from arcsec to kpc, based on the distance 20.6Mpc. Archival images: Sky-subtracted Spitzer Space Telescope 3.6-micron image. Sloane Digital Sky Survey g and r images. ngc5523h.fits: Image of NGC 5523 from the WIYN 3.5-m telescope. Section 2.1 contains observation and reduction information for this image. PI: Ralf Kotulla (original name NGC5523HOPEN.fits. Objects: -------------------------------------------------------------------- RA (2000) DE Designation(s) -------------------------------------------------------------------- 14 14 52.31 +25 19 03.4 NGC 5523 = SDSS J141452.36+251902.6 -------------------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file ellipse.dat 321 88 Output file from the Ellipse analysis (from ngc5523ellipseanalysis.fits file) smamag.dat 31 88 Observed Magnitude vs. SMA for the inner and outer disks of NGC 5523 (from ngc5523smaobservedmag.fits file) color.dat 404 43 Ellipse analysis for the SDSS g image, as well as the (g-r) color analysis (from ngc5523coloranalysis.fits file) smacolor.dat 47 43 Color analysis of NGC 5523 from SDSS (g-r) images (from ngc5523smagrcolor.fits file) list.dat 125 1 Information on fits file ngc5523h.fits 2880 8554 Image of NGC 5523 from the WIYN 3.5-m telescope tables/* 0 4 Individual tables in fits
Byte-by-byte Description of file: ellipse.dat
Bytes Format Units Label Explanations
1- 7 F7.2 pix sma Semi-major axis length (SMA) 9- 18 F10.3 --- Int Mean isophotal intensity (INTENS) 20- 29 F10.3 --- e_Int Error in isophotal intensity (rms/sqrt(Ndata)) (INT_ERR) 31- 39 F9.3 --- PixVar Estimate of pixel variance (rms*sqrt(SArea)) (PIX_VAR) 41- 49 F9.3 --- rms Root-mean-square scatter around isophotal intensity (RMS) 51- 56 F6.4 --- Ellip Ellipticity (ELLIP) 58- 63 F6.4 --- e_Ellip Ellipticity error (ELLIP_ERR) 65- 70 F6.2 deg PA [] Position angle, counterclockwise from +y (PA) 72- 77 F6.2 deg e_PA Position angle error (PA_ERR) 79- 85 F7.2 pix X0 Ellipse center, X0 (X0) 87- 92 F6.2 pix e_X0 Error of ellipse center X0 (X0_ERR) 94-100 F7.2 pix Y0 Ellipse center, Y0 (Y0) 102-107 F6.2 pix e_Y0 Error of ellipse center Y0 (Y0_ERR) 109-116 F8.3 --- Grad Local radial intensity gradient (GRAD) 118-123 F6.3 --- e_Grad Gradient error (GRAD_ERR) 125-130 F6.3 --- erGrad Gradient relative error (GRADRERR) 132-139 F8.6 pix+0.25 rsma (semi-major axis length) ** 1/4 (RSMA) 141-147 F7.3 --- mag Mean isophotal magnitude (MAG) 149-155 F7.3 --- e_mag Error on mag (lower value) (MAG_LERR) 157-163 F7.3 --- E_mag Error on mag (upper value) (MAG_UERR) 165-176 F12.5 --- TfluxE Total flux enclosed by ellipse (TFLUX_E) 178-189 F12.5 --- TfluxC Total flux enclosed by circle (TFLUX_C) 191-199 F9.6 mag TmagE Total flux enclosed by ellipse (TMAG_E) 201-209 F9.6 mag TmagC Total flux enclosed by circle (TMAG_C) 211-215 I5 --- NpixE Total number of valid pixels inside ellipse (NPIX_E) 217-222 I6 --- NpixC Total number of valid pixels inside circle (NPIX_C) 224-232 F9.3 --- A3 3rd harmonic deviations from ellipse (A3) 234-240 F7.3 --- e_A3 rms uncertainty on A3 (A3_ERR) 242-250 F9.3 --- B3 3rd harmonic deviations from ellipse (B3) 252-258 F7.3 --- e_B3 rms uncertainty on B3 (B3_ERR) 260-268 F9.3 --- A4 4th harmonic deviations from ellipse (A4) 270-276 F7.3 --- e_A4 rms uncertainty on A4 (A4_ERR) 278-286 F9.3 --- B4 4th harmonic deviations from ellipse (B4) 288-294 F7.3 --- e_B4 rms uncertainty on B4 (B4_ERR) 296-298 I3 --- Ndata Number of valid data points on isophote (NDATA) 300 I1 --- Nflag Number of flagged data points on isophote (NFLAG) 302-303 I2 --- Niter Number of iterations (NITER) 305 I1 --- Stop Stop condition code (STOP) 307-315 F9.3 --- Abig Maximum (in abs. value ) among 1st and 2nd harmonic amplitudes(A_BIG) 317-321 F5.1 pix SArea Average sector area on isophote (SAREA)
Byte-by-byte Description of file: smamag.dat
Bytes Format Units Label Explanations
1- 7 F7.2 pix sma Semi-major axis length (SMA) 9- 15 F7.3 --- mag Mean isophotal magnitude at 3.6um (MAG) 17- 31 F15.7 mag/arcsec+2 obsmag Observed magnitude at 3.6um (OBS_MAG)
Byte-by-byte Description of file: color.dat
Bytes Format Units Label Explanations
1- 7 F7.2 pix sma Semi-major axis length (SMA) 9- 18 F10.3 --- Int Mean isophotal intensity (INTENS) 20- 29 F10.3 --- e_Int Error in isophotal intensity (rms/sqrt(Ndata)) (INT_ERR) 31- 39 F9.3 --- PixVar Estimate of pixel variance (rms*sqrt(SArea)) (PIX_VAR) 41- 49 F9.3 --- rms Root-mean-square scatter around isophotal intensity (RMS) 51- 56 F6.4 --- Ellip Ellipticity (ELLIP) 58- 63 F6.4 --- e_Ellip Ellipticity error (ELLIP_ERR) 65- 70 F6.2 deg PA [] Position angle, counterclockwise from +y (PA) 72- 77 F6.2 deg e_PA Position angle error (PA_ERR) 79- 85 F7.2 pix X0 Ellipse center, X0 (X0) 87- 92 F6.2 pix e_X0 Error of ellipse center X0 (X0_ERR) 94-100 F7.2 pix Y0 Ellipse center, Y0 (Y0) 102-107 F6.2 pix e_Y0 Error of ellipse center Y0 (Y0_ERR) 109-116 F8.3 --- Grad Local radial intensity gradient (GRAD) 118-123 F6.3 --- e_Grad Gradient error (GRAD_ERR) 125-130 F6.3 --- erGrad Gradient relative error (GRADRERR) 132-139 F8.6 pix+0.25 rsma (semi-major axis length) ** 1/4 (RSMA) 141-147 F7.3 --- mag Mean isophotal magnitude (MAG) 149-155 F7.3 --- e_mag Error on mag (lower value) (MAG_LERR) 157-163 F7.3 --- E_mag Error on mag (upper value) (MAG_UERR) 165-176 F12.5 --- TfluxE Total flux enclosed by ellipse (TFLUX_E) 178-189 F12.5 --- TfluxC Total flux enclosed by circle (TFLUX_C) 191-197 F7.3 mag TmagE Total flux enclosed by ellipse (TMAG_E) 199-205 F7.3 mag TmagC Total flux enclosed by circle (TMAG_C) 207-211 I5 --- NpixE Total number of valid pixels inside ellipse (NPIX_E) 213-218 I6 --- NpixC Total number of valid pixels inside circle (NPIX_C) 220-228 F9.3 --- A3 3rd harmonic deviations from ellipse (A3) 230-236 F7.3 --- e_A3 rms uncertainty on A3 (A3_ERR) 238-246 F9.3 --- B3 3rd harmonic deviations from ellipse (B3) 248-254 F7.3 --- e_B3 rms uncertainty on B3 (B3_ERR) 256-264 F9.3 --- A4 4th harmonic deviations from ellipse (A4) 266-272 F7.3 --- e_A4 rms uncertainty on A4 (A4_ERR) 274-282 F9.3 --- B4 4th harmonic deviations from ellipse (B4) 284-290 F7.3 --- e_B4 rms uncertainty on B4 (B4_ERR) 292-293 I2 --- Ndata Number of valid data points on isophote (NDATA) 295 I1 --- Nflag Number of flagged data points on isophote (NFLAG) 297-298 I2 --- Niter Number of iterations (NITER) 300 I1 --- Stop Stop condition code (STOP) 302-310 F9.3 --- Abig Maximum (in abs. value ) among 1st and 2nd harmonic amplitudes(A_BIG) 312-316 F5.1 pix SArea Average sector area on isophote (SAREA) 318-332 F15.7 --- magC Mean isophotal magnitude inside circle (MAG_C) 334-348 F15.7 arcsec smaa Semi-major axis length in arcsec (SMA_arcsec) 350-356 F7.2 pix smag Semi-major axis length in g-band (SMA_g) 358-372 F15.7 --- magCg Mean isophotal magnitude inside circle in g band (MAGCg) 374-388 F15.7 arcsec smaag Semi-major axis length in arcsec in g band (SMAarcsecg) 390-404 F15.7 --- g-r g-r colour index ((g-r))
Byte-by-byte Description of file: smacolor.dat
Bytes Format Units Label Explanations
1- 15 F15.7 arcsec smaag Semi-major axis length in arcsec in g band (SMAarcsecg) 17- 31 F15.7 --- g-r g-r colour index ((g-r)) 33- 47 F15.7 kpc smakpc Conversion of the SMA of NGC 5523 from arcsec to kpc, based on the distance 20.6Mpc (sma_kpc)
Byte-by-byte Description of file: list.dat
Bytes Format Units Label Explanations
1- 9 F9.5 deg RAdeg Right Ascension of center (J2000) 10- 18 F9.5 deg DEdeg Declination of center (J2000) 20- 25 F6.4 arcsec/pix scale Scale of the image 27- 30 I4 --- Nx Number of pixels along X-axis 32- 35 I4 --- Ny Number of pixels along Y-axis 37- 57 A21 --- Obs.Date Observation date (YYYY-MM-DDThh:mm:ss.s) 59- 63 I5 Kibyte size Size of FITS file 65- 77 A13 --- FileName Name of FITS file 79-125 A47 --- Title Title of the FITS file
Acknowledgements: Leah Fulmer, lfulmer(at)wisc.edu
(End) Patricia Vannier [CDS] 31-Oct-2016
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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