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Extended downtime noticeDue to a planned outage on Friday, April 12th starting at noon through Sunday, April 14th, access to this site will be unavailable during this time. We apologize for any inconvenience. A Correction to the GALEX Spectral Fluxes Using CALSPEC and IUE ("GALEX-FLUXCAL")Bohlin & Bianchi 2019, AJ, accepted
Introduction
CALSPEC spectrum of LDS 749B (purple) overplotted with the GALEX spectrum as small black squares and as large black squares in 50 Å bins. The large black diamonds are the λeff = 1539 and 2316 Å GALEX broad-band photometry that is within 10% of the spectral measures. In the lower panel, the ratio of CALSPEC/GALEX is shown as black circles surrounded by large black diamonds. The GALEX plus CALSPEC statistical uncertainties combined in quadrature appear as small black diamonds connected by a dashed line with a scale in percent indicated on the right axis.
GALEX-FLUXCAL is a collection of 18 IUE spectral energy distributions (SEDs) on the CALSPEC scale that provide a correction to GALEX spectral fluxes. This HLSP also includes the correction in 50 Å bins from 1300 - 3000 Å. While GALEX spectrophotometry is repeatable to only 10-20% in regions of good sensitivity, the average flux correction presented here has a precision of ~3%. You can refer to the full collection of IGM-GAL data products using the DOI http://dx.doi.org/10.17909/T9DX2D You can retrieve the set of IUE data used in this HLSP using the DOI http://dx.doi.org/10.17909/T9FQ2N.
Description of Data ProductsEach of the 18 IUE targets have their SEDs available in both TXT and FITS format. The available columns in the SED files are:
In addition to the SEDs, a table is provided that has the GALEX-to-CALSPEC flux ratios in different wavelength bins. GALEX spectra should be multiplied by the average corrections in this table to place them on the HST/CALSPEC scale. The text table can be interpolated to define the GALEX correction at intermediate wavelengths. Data Access
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