Extended Ionized Gas Clouds in the Abell 1367 Cluster

We surveyed a central 0.6 deg2 region of the Abell 1367 cluster for extended ionized gas clouds (EIGs) using the Subaru prime-focus camera (Suprime-Cam) with a narrowband filter that covers Hα. We discovered six new EIGs in addition to five known EIGs. We also found that the Hα tail from the blue infalling group is extended to about 330 kpc in projected distance, which is about twice longer than previously reported. Candidates of star-forming blobs in the tail are detected. The properties of the EIG parent galaxies in Abell 1367 basically resemble those in the Coma cluster. A noticeable difference is that there are significantly fewer detached EIGs in Abell 1367, while the fraction of blue member galaxies is higher. The results suggest a difference in the evolutionary stage of the clusters; Abell 1367 is at an earlier stage than the Coma cluster.