AKARI and IRAS: From beam corrections to SEDs

作者：Clements, David L^*; Rowan Robinson, Michael; Pearson, Chris; Afonso, Jose; Labouteiller, Vianney; Farrah, Duncan; Efstathiou, Andreas; Greenslade, Josh; Wang, Lingyu

来源：Publications of the Astronomical Society of Japan, 2019, 71(1): 7.

DOI：10.1093/pasj/psy099

• catalogs
• infrared: galaxies
• galaxies: photometry
• galaxies: starburst

There is significant scientific value to be gained from combining AKARI fluxes with data at other far-infrared (IR) wavelengths from the Infrared Astronomical Satellite (IRAS) and Herschel missions. To be able to do this we must ensure that there are no systematic differences between the data sets that need to be corrected before the fluxes are compatible with each other. One such systematic effect identified in the Bright Source Catalog version 1 (BSCv1) data is the issue of beam corrections. We determine these for the BSC version 2 (BSCv2) data by correlating ratios of appropriate IRAS and AKARI bands with the difference in 2 Micron All Sky Survey (2MASS) J-band extended and point source magnitudes for sources cross-matched between the IRAS Faint Source Catalog (FSC), AKARI BSCv2 and 2MASS catalogs. We find significant correlations (p << 10(-13)) indicating that beam corrections are necessary in the 65 and 90 mu m bands. We then use these corrected fluxes to supplement existing data in spectral energy distribution (SED) fits for ultraluminous infrared galaxies (ULIRGs) in the Herschel ULIRG Survey (HERUS). The addition of AKARI fluxes makes little difference to the results of simple (T, beta) fits to the SEDs of these sources, though there is a general decrease in reduced chi(2) values. The utility of the extra AKARI data, however, is in allowing physically more realistic SED models with more parameters to be fitted to the data. We also extend our analysis of beam correction issues in the AKARI data by examining the Herschel Reference Sample (HRS) galaxies, which have Herschel photometry from 100 to 500 mu m and which are more spatially extended than the HERUS ULIRGs. 34 of the HRS sources have good Herschel SEDs and matching data from AKARI. This investigation finds that our simple 2MASS-based beam correction scheme is inadequate for these larger and more complex sources. There are also indications that additional beam corrections at 140 and 160 mu m are needed for these sources, extended on scales >1'.

• 出版日期2019-1
• 单位中国地震局; 美国弗吉尼亚理工大学(Virginia Tech)