Hubble Space Telescope Observations of Novae in M49

Hubble Space Telescope Observations of Novae in M49
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哈勃太空望远镜对 M49 新星的观测

DOI:
10.1086/379349
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发表时间:
2003
期刊:
The Astrophysical Journal
影响因子:
--
通讯作者:
A. Jordán
A. Jordán
中科院分区:
--
文献类型:
--
作者:
L. Ferrarese;P. Côté;A. Jordán

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哈勃太空望远镜已经开始搜寻 M49 (NGC 4472) 中的新星。 F555W(19个历元)和F814W(5个历元)为期55天的观测活动发现了九颗新星。我们发现,相对于银河系和 M31,M49 中缓慢、微弱的新星数量可能不足。相反,M49 新星的衰落率与 LMC 中新星的衰落率非常相似。这一事实反对将新星简单分类为“核球”和“盘”子类。我们检查了 M49 中新星的最大星等与衰落率 (MMRD) 关系,发现与银河系和 M31 MMRD 关系仅边缘一致。 Buscombe-de Vaucoulurs 关系的重新校准给出了 MV 最大值过去 15 天后的绝对星等,15 = -6.36 ± 0.19,这比之前基于银河新星的校准要亮得多。蒙特卡罗模拟得出 M49 的全局新星发生率 η = 100 yr-1 和光度特定新星发生率范围 νK = 1.7-2.5 yr-1 10-10 LK☉。这些速率远低于椭圆星系中新星产生的当前模型所预测的速率,并且可能表明新星祖细胞相对稀缺或早期类型环境中的复发时间尺度增加。
A search for novae in M49 (NGC 4472) has been undertaken with the Hubble Space Telescope. A 55 day observing campaign in F555W (19 epochs) and F814W (five epochs) has led to the discovery of nine novae. We find that M49 may be underabundant in slow, faint novae relative to the Milky Way and M31. Instead, the decline rates of the M49 novae are remarkably similar to those of novae in the LMC. This fact argues against a simple classification of novae in "bulge" and "disk" subclasses. We examine the maximum magnitude versus rate of decline (MMRD) relation for novae in M49, finding only marginal agreement with the Galactic and M31 MMRD relations. A recalibration of the Buscombe-de Vaucouleurs relation gives an absolute magnitude 15 days past maximum of MV,15 = -6.36 ± 0.19, which is substantially brighter than previous calibrations based on Galactic novae. Monte Carlo simulations yield a global nova rate for M49 of η = 100 yr-1 and a luminosity-specific nova rate in the range νK = 1.7-2.5 yr-1 10-10 LK☉. These rates are far lower than those predicted by current models of nova production in elliptical galaxies and may point to a relative scarcity of novae progenitors or an increased recurrence timescale in early-type environments.
DOI: 10.1086/301442
发表时间: 2000-04
期刊: The Astronomical Journal
影响因子: --
作者:
S. C. Trager;S. Faber;G. Worthey;J. J. G. Ociw-J.;UCOLick;St. Ambrose;IA-UNAM
通讯作者: S. C. Trager;S. Faber;G. Worthey;J. J. G. Ociw-J.;UCOLick;St. Ambrose;IA-UNAM
DOI: --
发表时间: 2021
期刊:
影响因子: --
作者:
小松 堯;今野紀雄;森岡 悠;瀬川悦生;冨澤佑季乃
通讯作者: 冨澤佑季乃