| タイトル | The Young Massive Stellar Cluster Sandage-96 after the Explosion of SN 2004DJ in NGC 2403 |
| 本文（外部サイト） | http://hdl.handle.net/2060/20080045520 |
| 著者（英） | Filippenko, A. V.; Immler, S.; Foley R.; Kun, M.; Szabo, Gy. M.; Kiss, L. L.; Sarneczky, K.; Vinko, J.; Csak, B.; Klagyivik, P.; Misselt, K.; Brown, P. J.; Balog, Z.; Sugerman, B. |
| 著者所属（英） | NASA Goddard Space Flight Center |
| 発行日 | 2008-01-01 |
| 言語 | eng |
| 内容記述 | The bright supernova 2004dj occurred within the young massive stellar cluster Sandage-96 in a spiral arm of NGC 2403, close to other star-forming complexes. New multi-wavelength observations obtained with several ground-based- and space telescopes are combined to study the radiation from Sandage-96 after SN 2004dj faded away. The late-time light curves show that Sandage-96 started to dominate the flux in the optical bands after September, 2006 (+800 days after explosion). The optical fluxes are equal to the pre-explosion ones, suggesting that Sandage-96 has survived the explosion without significant changes in its stellar population. An optical Keck-spectrum obtained at +900 days after explosion shows the dominant blue continuum from the cluster stars shortward of 6000 A as well as strong SN nebular emission lines redward. The integrated SED of the cluster has been extended into the UV-region by archival XMM-Newton and new Swift observations, and compared with theoretical models. The outer parts of the cluster have been resolved by HST allowing the construction of a color-magnitude diagram. The fitting of the cluster SED with theoretical isochrones results in two possible solutions with ages being 9+/-1 Myr and 30+/-10 Myr, depending on the assumed metallicity and the theoretical model family. The isochrone fitting of the color-magnitude diagram indicates that the outer part of the cluster consists of stars having an age dispersion of 16 < t < 63 Myr, which is similar to that of nearby field stars. This age discrepancy may be resolved by the hypothesis that the outskirt of Sandage-96 is contaminated by stars captured from the field during cluster formation. The young age of Sandage-96 and the comparison of its pre- and post-explosion SEDs suggest a progenitor mass of 15 < or equal to M(sub prog) < 25 Stellar Mass. |
| NASA分類 | Astronomy |
| 権利 | Copyright, Distribution as joint owner in the copyright |
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