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Tycho Brahe's 1572 supernova as a standard type Ia explosion revealed from its light echo spectrum
Oliver Krause, Masaomi Tanaka, Tomonori Usuda +4
Type Ia supernovae (SNe Ia) are thermonuclear explosions of white dwarf stars in close binary systems. They play an important role as cosmological distance indicators and have led…
No Evidence for Variability of Intervening Absorption Lines toward GRB 060206: Implications for the Mg II Incidence Problem
Kentaro Aoki, Tomonori Totani, Takashi Hattori +6
We examine variability of absorption line strength of intervening systems along the line of sight to GRB 060206 at , by the low-resolution optical spectra obtained by the…
Strange filamentary structures ("fireballs") around a merger galaxy in the Coma cluster of galaxies
M. Yoshida, M. Yagi, Y. Komiyama +6
We found an unusual complex of narrow blue filaments, bright blue knots, and H-alpha emitting filaments and clouds, which morphologically resembled a complex of ``fireballs,'' exte…
The Cassiopeia A Supernova was of Type IIB
Oliver Krause, Stephan M. Birkmann, Tomonori Usuda +4
Cassiopeia A is one of the youngest supernova remnants known in the Milky Way and a unique laboratory for supernova physics. We present an optical spectrum of the Cassiopeia A supe…
Integrated field spectroscopy of E+A (post-starburst) galaxies with the Kyoto3DII
Tomotsugu Goto, Atsushi Kawai, Atsushi Shimono +3
We have performed a two-dimensional spectroscopy of three nearby E+A (post-starburst) galaxies with the Kyoto3DII integral field spectrograph. In all the cases, Hdelta absorption i…
Asphericity in Supernova Explosions from Late-Time Spectroscopy
Keiichi Maeda, Koji Kawabata, Paolo A. Mazzali +15
Core-collapse supernovae (CC-SNe) are the explosions that announce the death of massive stars. Some CC-SNe are linked to long-duration gamma-ray bursts (GRBs) and are highly aspher…