AKARI NEP field: Point source catalogs from GALEX and Herschel observations and selection of candidate lensed sub-millimeter galaxies
AKARI NEP field: Point source catalogs from GALEX and Herschel observations and selection of candidate lensed sub-millimeter galaxies
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AKARI NEP 场：来自 GALEX 和 Herschel 观测的点源目录以及候选透镜亚毫米星系的选择
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发表时间：
2019
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通讯作者：
Laia Barrufet de Soto
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作者：
D. Burgarella;F. Mazyed;N. Oi;T. Goto;V. Buat;M. Malkan;Hyung;H. Matsuhara;C. Pearson;S. Serjeant;G. White;Laia Barrufet de Soto
AKARI宽北向磁场是最重要的宇宙学领域之一，因为它位于许多空间望远镜的连续观察区，例如，Herschel，HST和JWST，它也是L2晕轨道的天然高可见度场。该区域也将是欧几里得使命的深度调查地点。最后，AKARI利用其在北极（NEP）场的九个连续带滤波器进行了深中红外观测。我们分析了GALEX和Herschel在NEP领域的观测结果，建立了七个波段的星表：GALEX远紫外和近紫外，Herschel PACS 100 μm和250 μm，SPIRE 250 μm，350 μm和500 μm，并进行了质量检查。SPIRE星表用于通过350 μm至500 μm的红色颜色识别61个（主列表中6个，补充列表中55个）候选透镜星系。对于500 μm通量密度>100 mJy的候选者中最亮的，已经用NOEMA干涉仪进行了毫米波长的后续观测。这些高质量的观测使我们能够研究和比较它们的形态，而不仅仅是使用赫歇尔数据。我们发现，它们中的大多数都表现为多个对象。主表中源的红移分布在1.5 < z < 2.3的范围内。它们的红外光度证实了这些来源很可能是强透镜星系。
The AKARI Wide North Ecliptic field is one of the most important cosmological fields because it lies in the continuous viewing zones for many space telescopes, e.g., Herschel, HST, and JWST, and it is also a natural high-visibility field from the L2 halo orbit. The field will be also the location of the deep survey for the Euclid mission. Finally, AKARI has made deep mid-IR observations using its nine continuous band filters in the North Ecliptic Pole (NEP) field. We analyzed GALEX and Herschel observations in the NEP field to build catalogs in seven bands: GALEX far UV and near UV, Herschel PACS 100 μm and 250 μm, and SPIRE 250 μm, 350 μm, and 500 μm with quality checks. The SPIRE catalogs are used to identify 61 (6 in a main list and 55 in a supplementary list) candidate lensed galaxies through red 350 μm to 500 μm colors. For the brightest of these candidates with 500 μm flux densities >100 mJy, follow-up observations in millimeter wavelengths have been carried out with the NOEMA interferometer. The high quality of these observations has allowed us to study and compare their morphology beyond that possible using Herschel data alone. We find that the majority of them appear as multiple objects. The redshift distribution of the sources in the main list is found to be in the range 1.5 < z < 2.3. Their IR luminosities confirm that these sources are very likely strongly lensed galaxies.