Mission Overview
An Atlas of Galaxy Spectral Energy Distributions from the UV to the Mid-IR (GALSEDATLAS)
Primary Investigator: Michael Brown
HLSP Authors: Michael Brown
Released: 2019-05-14
Updated: 2017-01-30
Primary Reference(s): Brown et al. (2014)
Citations: See ADS Statistics
Overview
GALSEDATLAS presents spectral energy distributions (SEDs), covering the ultraviolet to the mid-infrared, for 129 nearby galaxies spanning a wide range of galaxy types. The SEDs were obtained by combining ground-based optical spectrophotometry with infrared spectroscopy from Spitzer and Akari, and covering gaps in wavelength coverage with SED models. In addition, the authors measured matched-aperture photometry for each source from images taken by Swift-UVOT, GALEX, SDSS, 2MASS, Spitzer, and WISE, enabling mitigation of systematic errors, in order to normalize and constrain the resulting spectra. By providing comprehensive SEDs over a very wide range of galaxy types, GALSEDATLAS will improve K-corrections, photometric redshifts, and star-formation rate calibrations. See Brown et al. (2014) for full details.
Description of Data Products
This HLSP comprises images, spectral energy distributions (SEDs), and catalogs. The photometry that constrained the SEDs for each source were derived from the images obtained from various missions. These images are provided here as-is for reproducibility purposes. The final SEDs and photometric catalogs are available as a single summary catalog file in FITS format.
Data file naming convention:
hlsp_galsedatlas_<observatory>_<instrument>_<galaxy>_<filter>_v1_<ext>
where:
<observatory> = swift, galex, sdss, 2mass, spitzer, or wise
<instrument> = e.g., "imager"
<galaxy> = string for the galaxy name, e.g., "ngc-3190"
<filter> = string for the filter name, e.g. ugriz, fuv, nuv
<ext> = file type and extension, indicating what the file contains; see below for details
Data file types:
| _img.fits | Image files from which matched-aperture photometry was derived |
| _spec.dat | Final constrained SED for each source |
| _cat.csv | Photometry or SED summary file |
| _cat.fits | Full atlas, SEDs, and catalogs |
Data Access
Access the photometric catalogs and atlas summary file below.
| Catalog | Description |
|---|---|
| GALSEDATLAS combined catalog | All catalogs and SEDs |
| Photometry catalog | |
| Extinction Catalog | Extinction catalog |
| Summary | SED summary catalog |
The table below contains links to 1) an individual page for each galaxy in the atlas, containing download links for the FITS images from which the photometric catalogs were derived; and 2) a direct link to the SED file for each galaxy.
Citations
Please remember to cite the appropriate paper(s) below and the DOI 10.17909/t9-5bxk-dh29 if you use these data in a published work.
Note: These HLSP data products are licensed for use under CC BY 4.0.