Serendipitous discovery of a young cluster of galaxies at $z\sim 0.5$ projected next to the nearby tadpole galaxy KUG 1138 + 327

Q. Daniel Wang, Juergen Ott

Using a 90 ks Chandra ACIS-S observation in the 0.3--7 keV band, along with complementary Low-Frequency Array and Karl G.~Jansky Very Large Array data in the 120--168 MHz and 1--2…