Looking deep with the Hyper Suprime-Cam
The Hyper Suprime-Cam (HSC) team made the second data release public!
The HSC on the 8-meter Subaru telescope in Hawaii also covers the COSMOS field. The increased depth in the g, r, i, z, and Y-band in DR2 is crucial for the study of the first galaxies in our universe. But it doesn't stop there - also galaxies that cease their star-formation can be studied in detail with these data.
The increase in depth is stunning - between 0.7 and 1.7 AB magnitudes with new limiting magnitudes of (depth of old observations in parenthesis) 28.4 (27.6) , 28.0 (27.0), 27.7 (26.9), 27.1 (26.4), and (26.6) 24.9 in g, r, i, z, and Y-band, respectively.
The image shows a comparison of the previous Suprime-Cam data (right) vs. HSC DR2 data(left) in I-band on a small field of COSMOS. Note the much deeper imaging of HSC DR2 (also compare the insets).
More information on the HSC data release 2: https://hsc-release.mtk.nao.ac.jp/doc/index.php/tools-2/