2016A&A...588A.107B -
Astronomy and Astrophysics, volume 588A, 107-107 (2016/4-1)
Comparison of absolute gain photometric calibration between Planck/HFI and Herschel/SPIRE at 545 and 857 GHz.
BERTINCOURT B., LAGACHE G., MARTIN P.G., SCHULZ B., CONVERSI L., DASSAS K., MAURIN L., ABERGEL A., BEELEN A., BERNARD J.-P., CRILL B.P., DOLE H., EALES S., GUDMUNDSSON J.E., LELLOUCH E., MORENO R. and PERDEREAU O.
Abstract (from CDS):
We compare the absolute gain photometric calibration of the Planck/HFI and Herschel/SPIRE instruments on diffuse emission. The absolute calibration of HFI and SPIRE each relies on planet flux measurements and comparison with theoretical far-infrared emission models of planetary atmospheres. We measure the photometric cross calibration between the instruments at two overlapping bands, 545GHz/500µm and 857GHz/350µm. The SPIRE maps used have been processed in the Herschel Interactive Processing Environment (Version 12) and the HFI data are from the 2015 Public Data Release 2. For our study we used 15 large fields observed with SPIRE, which cover a total of about 120deg2. We have selected these fields carefully to provide high signal-to-noise ratio, avoid residual systematics in the SPIRE maps, and span a wide range of surface brightness. The HFI maps are bandpass-corrected to match the emission observed by the SPIRE bandpasses. The SPIRE maps are convolved to match the HFI beam and put on a common pixel grid. We measure the cross-calibration relative gain between the instruments using two methods in each field, pixel-to-pixel correlation and angular power spectrum measurements. The SPIRE/HFI relative gains are 1.047 (±0.0069) and 1.003 (±0.0080) at 545 and 857GHz, respectively, indicating very good agreement between the instruments. These relative gains deviate from unity by much less than the uncertainty of the absolute extended emission calibration, which is about 6.4% and 9.5% for HFI and SPIRE, respectively, but the deviations are comparable to the values 1.4% and 5.5% for HFI and SPIRE if the uncertainty from models of the common calibrator can be discounted. Of the 5.5% uncertainty for SPIRE, 4% arises from the uncertainty of the effective beam solid angle, which impacts the adopted SPIRE point source to extended source unit conversion factor, highlighting that as a focus for refinement.
Abstract Copyright:
© ESO, 2016
Journal keyword(s):
methods: data analysis
Simbad objects:
4
Full paper
View the references in ADS
To bookmark this query, right click on this link: simbad:2016A&A...588A.107B and select 'bookmark this link' or equivalent in the popup menu