David L. Clements, Michael Rowan-Robinson, Chris Pearson, Jose Afonso, Vianney Labouteiller, Duncan Farrah, Andreas Efstathiou, Josh Greenslade, Lingyu Wang
备注：
Accepted for publication in the PASJ special issue on AKARI. 3 Figures
There is significant scientific value to be gained from combining AKARI fluxes with data at other far-IR wavelengths from the IRAS and Herschel missions. To be able to do this we must ensure that there are no systematic differences between the datasets that need to be corrected before the fluxes are compatible with each other. One such systematic effect identified in the BSCv1 data is the issue of beam corrections. We determine these for the BSCv2 data by correlating ratios of appropriate IRAS and AKARI bands with the difference in 2MASS J band extended and point source magnitudes for sources cross matched between the IRAS FSC, AKARI BSCv2 and 2MASS catalogs. We find significant correlations (p<< 10^-13) indicating that beam corrections are necessary in the 65 and 90 micron bands. We then use these corrected fluxes to supplement existing data in spectral energy distribution (SED) fits for ultraluminous infrared galaxies in the HERUS survey. 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 fit to the data. We also extend our analysis of beam correction issues in the AKARI data by examining the Herschel Reference Sample, which have Herschel photometry from 100 to 500 microns and which are more spatially extended than the HERUS ULIRGs. Thirty-four 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 microns are needed for these sources, extended on scales >1 arcminute.
Dramatic infrared variability of WISE J1810-3305: catching early dust ejection during the thermal pulse of an AGB star?
我们提出了一个源的宽带红外测光特性类似樱井的对象的发现。WISE J180956.27-330500.2（以下简称J1810-3305）显示非常红的WISE颜色，但显示非常蓝的2 MASS [K]与WISE [W1（3.4微米）]颜色。它在IRAS时代是不可见的，但现在有12微米的通量，远高于IRAS点源目录的检测极限。历史上的光学照相底片以及多时期AKARI中红外测量也有变化的迹象。宽带红外光谱能量分布，后IRAS增亮和多波长可变性都是樱井的对象所共有的特征-一个后渐近巨星分支（后AGB）恒星，经历了后期的热脉冲，最近喷出了大量的尘埃，目前正在膨胀和冷却。光学祖先的颜色表明，J1810-3305可能是晚期光谱类。它的戏剧性的红外增亮，并检测到一个晚型光学对应物是一致的情况下，我们已经抓住了一个极其巨大的尘埃喷射事件（在1998年或不久之前）在热脉冲的AGB星，从而提供了一个独特的机会，观察恒星演化在这一阶段。J1810-3305是整个WISE初步数据发布中唯一具有类似红外SED和可变性的源，强调了此类源的稀有性。确认其性质是非常重要的。
Infrared SED Modeling of Velocity-Excess Maser Sources: Identifying Incipient Water-Fountain Candidates
School of Physics and Astronomy, Sun Yat-sen University（中山大学物理学院）；CSST Science Center for the Guangdong-Hong Kong-Macau Greater Bay Area, Sun Yat-Sen University（中山大学粤港澳大湾区空间科学中心）
