Mazzali 2007 SN 2006aj的晚期谱观测

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文章信息:
Keck and ESO-VLT View of the Symmetry of the Ejecta of the XRF/SN 2006aj

Authors: Paolo A. Mazzali, Ryan J. Foley, Jinsong Deng, Ferdinando Patat, Elena Pian, Dietrich Baade, Joshua S. Bloom, Alexei V. Filippenko, Daniel A. Perley, Stefano Valenti, Lifan Wang, Koji Kawabata, Keiichi Maeda, Ken-ichi Nomoto

(Submitted on 6 Mar 2007)

Abstract: Nebular-phase spectra of SN 2006aj, which was discovered in coincidence with X-ray flash 060218, were obtained with Keck in 2006 July and the Very Large Telescope in 2006 September. At the latter epoch spectropolarimetry was also attempted, yielding an upper limit of ~ 2% for the polarization. The spectra show strong emission lines of [OI] and MgI], as expected from a Type Ic supernova, but weak CaII lines. The [FeII] lines that were strong in the spectra of SN 1998bw are much weaker in SN 2006aj, consistent with the lower luminosity of this SN. The outer velocity of the line-emitting ejecta is ~ 8000 km/s in July and ~ 7400 km/s in September, consistent with the relatively low kinetic energy of expansion of SN 2006aj. All emission lines have similar width, and the profiles are symmetric, indicating that no major asymmetries are present in the ejecta at the velocities sampled by the nebular lines (v <>

Comments:

20 pages, 6 figures. Accepted for publication in the Astrophysical Journal

Subjects:

Astrophysics (astro-ph)

Cite as:

arXiv:astro-ph/0703109v1