Year: 2012
Type: article
Abstract: We present observations of SDF-05M05, an unusual optical transient discovered in the Subaru Deep Field (SDF). The duration of the transient is > ∼ 800 days in the observer frame, and the maximum brightness during observation reached approximately 23 mag in the i ' and z ' bands. The faint host galaxy is clearly identified in all five optical bands of the deep SDF images. The photometric redshift of the host yields z ∼ 0.6 and the corresponding absolute magnitude at maximum is ∼ − 20. This implies that this event shone with an absolute magnitude brighter than −19 mag for approximately 300 days in the rest frame, which is significantly longer than a typical supernova and ultraluminous supernova. The total radiated energy during our observation was 1 × 10 51 erg. The light curves and color evolution are marginally consistent with some luminous IIn supernovae. We suggest that the transient may be a unique and peculiar supernova at intermediate redshift.
Authors: Yuji Urata, Patrick P. Tsai, Kuiyun Huang, Tomoki Morokuma, Naoki Yasuda, Masaomi Tanaka, Kentaro Motohara, Masao Hayashi, Nobunari Kashikawa, Chun Ly, Matthew A. Malkan
Institutions: National Central University, Institute of Astronomy and Astrophysics, Academia Sinica, Academia Sinica, Institute of Astronomy, Graduate School of Science, The University of Tokyo, The University of Tokyo, Kavli Institute for the Physics and Mathematics of the Universe, National Astronomical Observatory of Japan, Space Telescope Science Institute, University of California, Los Angeles
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2069155326