SINGS: Summary Page Information
Most of the text below is taken directly from the SINGS delivery document; please use that document for a full understanding of the SINGS Enhanced Products data. The information below is a short summary of the naming convensions used in the SINGS Summary Pages.Ancillary Data
The image (FITS) ancillary data available for download are listed based on filter/band of the observation, which is stripped out of the file name of that dataset [ngcXXXX_#.fits (with #=B,V,R,I,Ha,Ha_sub e.g., ngc5194_Ha.fits)]. For each image a link to the FITS version is listed first, followed by a link to the JPEG preview (created by IRSA using the the Montage software tool suite.)
On the lefthand side, a 3-color image has been created for preview purposes by IRSA, also using Montage [B (blue) + R (green) + I (red)]. This image can be seen in full resolution by clicking on the small thumbnail on the Summary page.
Optical imaging data in the standard B, V, R, I broad-band filters and in narrow-band filters at the wavelength of the Ha+[NII] emission, plus continuum-subtracted Ha+[NII] images, are delivered for 24 of the 25 galaxies (for NGC5408, only the continuum subtracted Ha and associated continuum images are available).
The images are either single pointings, or mosaics of 2 or more adjacent and partially-overlapping frames. The images are not background-subtracted. All optical data are single extension FITS files (one file for each filter); they are flux calibrated and have astrometric solutions. Photometric and astrometric keywords are stored in the FITS headers.
The pixel scale is 0.305 arcsec (KPNO data) or 0.433 arcsec (CTIO data). The images have NE orientation, and are registered to a common frame. The flux scale is count/sec (CPS), and the relevant photometric keywords are: PHOTFLAM, to convert CPS to Jy, and ZPOINT, for the zeropoint.
The ascii text spectra ancillary data available for download are listed based on type of spectum, which is stripped out of the file name of that dataset [ngcXXXX_nuclear_002_5.txt and ngcXXXX_drift_020_020.txt are called "NUCLEAR and "DRIFT" in the listings]. For each spectrum a link to the ascii text version is listed first, followed by a link to the JPEG preview (created by IRSA using the the unix "graph" tool.)Optical spectra for the SINGS galaxies in the wavelength range 0.36-0.70 um, with resolution ~8 Angstrom, were obtained at the 2.3-meter Bok telescope with the B&C spectrograph, and at the 1.5-meter CTIO telescope with CSPEC. Three types of long-slit spectra were obtained:
- Nuclear spectra: a 2".5 wide aperture (3" at CTIO) was pointed at the brightest central spot of the galaxy;
- 20" drift scans: the slit was drifted for 20" around the central region, while exposing;
- 55" drift scans: similar to the 20" drift scans, with a scan length of 55".
A link is also available to search the NASA/IPAC Extragalactic Database (NED) using the name of the SINGS object. Lastly, the IRSA Archive search link uses IRSA's inventory service (RADAR) to check for other data in the archive matching the SINGS galaxy name/position.
IRAC Data
The image (FITS) IRAC data available for download are listed in order of the channel number of the observation [IRAC Channel 1 = IRAC1; IRAC Channel 2 = IRAC2; etc]. For each image a link to the FITS version is listed first, followed by a link to the JPEG preview (created by IRSA using the the Montage software tool suite.)
On the lefthand side, a 3-color image has been created for preview purposes by IRSA, also using Montage [ch1 (blue) + ch2 (green) + ch4 (red)]. This image can be seen in full resolution by clicking on the small thumbnail on the Summary page.
For each galaxy, 4 mosaics, one for each of the four IRAC bands, are delivered as single-extension FITS files. The pixel scale of the mosaics is 0.75 arcsec, and the flux scale is MJy sr-1.
MIPS Data
The image (FITS) MIPS data available for download are listed based on bands of the observation [MIPS24, MIPS70 and MIPS160]. For each image a link to the FITS version is listed first, followed by a link to the JPEG preview (created by IRSA using the the Montage software tool suite.)
On the lefthand side, a grayscale image of MIPS24 has been created for preview purposes by IRSA, also using Montage. This image can be seen in full resolution by clicking on the small thumbnail on the Summary page.
For each galaxy, 3 mosaics, one for each of the MIPS bands, are delivered as single-extension FITS files. The pixel scale of the MIPS mosaics is wavelength-dependent: 0.75 arcsec at 24 mm, 3.00 arcsec at 70 mm, and 6.00 arcsec at 160 mm. The flux scale is MJy sr-1.
IRS Data
The image (FITS) IRS data available for download are listed based on line maps of the observation [neIII, siII, pah_8, pah_11_3]. For each image a link to the FITS version is listed first, followed by a link to the JPEG preview (created by IRSA using the the Montage software tool suite.)
Two-dimensional continuum-subtracted line maps in [SiII] 34.8mm, and [NeIII] 15.5 mm (where available), and maps of poly-cyclic aromatic hydrocarbon emission (7.6um+8.6um, 11.3um), are also delivered for the 25 galaxies, plus the adjacent continuum maps at 15mm and 35mm for the emission lines. The images are delivered as single extension FITS files. The units of the [NeIII] and [SiII] line maps are W m-2 sr-1, while all other maps have units MJy/sr.
IRS 2D Maps: ngcXXXX_DR2_MD#_line.fits (line=neIII, siII, pah_8, pah_11_3) and ngcXXXX_DR2_MD#_line_cont.fits (line=neIII, siII)
The ascii spectra data available for download are listed based on the IRS mode, which is stripped out of the file name of that dataset [Short-Low => SL, Short-High => SH, Long-Low => LL, etc]. For each spectrum a link to the ascii table version is listed first, followed by a link to the JPEG preview (created by IRSA using the the unix "graph" tool.)
Both Low-resolution and High-resolution, one-dimensional (1D) spectra of the central 23"x15" (High-res) to 50"x33" (Low-res) are delivered for each of the 25 galaxies, in the wavelength range 5-15 mm (Short-Low, SL, R=50-100), 15-37 mm (Long- Low, LL, R=50-100), 10-20 mm (Short-High, SH, R=600), 20-37 mm (Long-High, LH, R=600). The fluxes are calibrated in MJy sr-1. The data are provided as multiple ASCII files (.tbl).
IRS Low-Res 1D spectra: ngcXXXX_DR2_MD#_nuc_sp.tbl (MD=SL,LL; #=1,2). IRS High-Res 1D spectra: ngcXXXX_DR2_MD_nuc_sp.tbl (MD=SH,LH)
On the lefthand side, a grayscale plot of the SH_nuc (Short-High, R=600) spectrum has been created for preview purposes by IRSA, also using the unix "graph" tool. This image can be seen in full resolution by clicking on the small thumbnail on the Summary page.
