AKARI FAR-INFRARED ALL-SKY SURVEY MAPS
AKARI FAR-INFRARED ALL-SKY SURVEY MAPS
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DOI：
10.5303/pkas.2012.27.4.111
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发表时间：
2012-09
期刊：
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通讯作者：
Y. Doi;S. Komugi;M. Kawada;S. Takita;K. Arimatsu;N. Ikeda;D. Kato;Y. Kitamura;T. Nakagawa;T. Ootsubo;T. Morishima;M. Hattori;Masahiro Tanaka;G. White;M. Etxaluze;H. Shibai
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作者：
Y. Doi;S. Komugi;M. Kawada;S. Takita;K. Arimatsu;N. Ikeda;D. Kato;Y. Kitamura;T. Nakagawa;T. Ootsubo;T. Morishima;M. Hattori;Masahiro Tanaka;G. White;M. Etxaluze;H. Shibai
远红外观测为星际介质 (ISM) 中尘埃物质的特性的研究和表征提供了关键数据，因为其大部分能量在 100 至 200 ㎛ 之间发射。我们展示了使用日本 AKARI 卫星进行的敏感全天勘测的第一张全天图像，波长范围为 50 ? 180㎛。使用以 65 ㎛、90 ㎛、140 ㎛ 和 160 ㎛ 波长为中心的四个滤光片，在四个光度波段覆盖 > 99% 的天空，实现了 1 至 2 arcmin 的空间分辨率和 -1 的检测限，绝对和相对光度精度 < 20%。银河尘埃连续发射的全天空图像使天文学家能够绘制漫射ISM卷云的大范围分布图，研究其热尘埃温度、发射率和柱密度，并测量银河辐射场和嵌入物体与周围ISM的相互作用。除了恒星、原恒星、恒星形成区域和星系的点源群之外，高纬度银河系的天空还被显示出覆盖着弥漫的尘埃发射丝状网，追踪高纬度恒星形成的潜在地点。我们表明，可以使用 90 ㎛、140 ㎛ 和 160 ㎛ 数据来估计与周围星际辐射场热平衡的尘埃粒子的温度。 FIR AKARI 全天空地图提供了丰富的新数据集，天文学家可以在其中研究整个银河系及其他地区星际物质的分布。
Far-infrared observations provide crucial data for the investigation and characterisation of the properties of dusty material in the Interstellar Medium (ISM), since most of its energy is emitted between~100 and 200 ㎛. We present the first all-sky image from a sensitive all-sky survey using the Japanese AKARI satellite, in the wavelength range 50 ? 180 ㎛. Covering > 99% of the sky in four photometric bands with four filters centred at 65 ㎛, 90 ㎛, 140 ㎛, and 160 ㎛ wavelengths, this achieved spatial resolutions from 1 to 2 arcmin and a detection limit of -1 , with absolute and relative photometric accuracies of < 20%. All-sky images of the Galactic dust continuum emission enable astronomers to map the large-scale distribution of the diffuse ISM cirrus, to study its thermal dust temperature, emissivity and column density, and to measure the interaction of the Galactic radiation field and embedded objects with the surrounding ISM. In addition to the point source population of stars, protostars, star-forming regions, and galaxies, the high Galactic latitude sky is shown to be covered with a diffuse filamentary-web of dusty emission that traces the potential sites of high latitude star formation. We show that the temperature of dust particles in thermal equilibrium with the ambient interstellar radiation field can be estimated by using 90 ㎛, 140 ㎛, and 160 ㎛ data. The FIR AKARI full-sky maps provide a rich new data set within which astronomers can investigate the distribution of interstellar matter throughout our Galaxy, and beyond.