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arXiv 0911.0690astro-ph.COastro-ph.GA
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Ia型超新星的局部演化

The Local Hosts of Type Ia Supernovae

James D. Neill, Mark Sullivan, D. Andy Howell, Alex Conley, Mark Seibert, D. Christopher Martin, Tom A. Barlow, Karl Foster, Peter G. Friedman, Patrick Morrisse… 展开作者

James D. Neill, Mark Sullivan, D. Andy Howell, Alex Conley, Mark Seibert, D. Christopher Martin, Tom A. Barlow, Karl Foster, Peter G. Friedman, Patrick Morrissey, Susan G. Neff, David Schiminovich, Ted K. Wyder, Luciana Bianchi, José Donas, Timothy M. Heckman, Young-Wook Lee, Barry F. Madore, Bruno Milliard, R. Michael Rich, Alex S. Szalay

摘要:

我们使用多波长,匹配孔径,综合测光从GALEX,SDSS和RC 3估计的物理性质的166个附近的星系托管168个观测良好的Ia型超新星(SNe Ia)。我们的数据证实了在其他SN Ia样本中看到的众所周知的特征。具体来说,活跃的恒星形成的主机平均产生更亮和更慢的超新星Ia,而亮度加权年龄大于1 Gyr的主机平均产生更暗,更快和更少亮,更慢的超新星Ia。新的结果包括,在我们的样本中,最暗和最快的Ia超新星只出现在超过恒星质量阈值~10^10 M_sun的星系中,这表明它们的祖先必须出现在比一般的Ia超新星更古老和/或更富含金属的群体中。一个低的主机消光子样本暗示在一个剩余的趋势,在峰值亮度与主机年龄,校正后的光曲线形状,给人的印象是,较老的主机产生较少的超新星Ia平均。这对Ia超新星的宇宙学拟合有影响,并表明宿主年龄可能是拟合中有用的参数。转换主机质量的金属丰度和计算56 Ni质量的超新星光变曲线,我们发现,我们的本地样本是一致的模型,预测恒星金属丰度和56 Ni质量的权力爆炸之间的浅趋势,但我们不能排除没有一个趋势。我们测量的56 Ni质量和主机年龄之间的相关性在当地的宇宙是浅,而不是在更高的红移所看到的显着。在低红移和高红移下年龄-56 Ni质量相关的细节意味着超新星Ia宿主的亮度加权年龄阈值为~ 3Gyr,在此之上它们不太可能产生56 Ni质量高于~ 0.5M_sun的超新星Ia。(节录)

英文摘要:

We use multi-wavelength, matched aperture, integrated photometry from GALEX, SDSS and the RC3 to estimate the physical properties of 166 nearby galaxies hosting 168 well-observed Type Ia supernovae (SNe Ia). Our data corroborate well-known features that have been seen in other SN Ia samples. Specifically, hosts with active star formation produce brighter and slower SNe Ia on average, and hosts with luminosity-weighted ages older than 1 Gyr produce on average more faint, fast and fewer bright, slow SNe Ia than younger hosts. New results include that in our sample, the faintest and fastest SNe Ia occur only in galaxies exceeding a stellar mass threshhold of ~10^10 M_sun, indicating that their progenitors must arise in populations that are older and/or more metal rich than the general SN Ia population. A low host extinction sub-sample hints at a residual trend in peak luminosity with host age, after correcting for light-curve shape, giving the appearance that older hosts produce less-extincted SNe Ia on average. This has implications for cosmological fitting of SNe Ia and suggests that host age could be useful as a parameter in the fitting. Converting host mass to metallicity and computing 56Ni mass from the supernova light curves, we find that our local sample is consistent with a model that predicts a shallow trend between stellar metallicity and the 56Ni mass that powers the explosion, but we cannot rule out the absence of a trend. We measure a correlation between 56Ni mass and host age in the local universe that is shallower and not as significant as that seen at higher redshifts. The details of the age -- 56Ni mass correlations at low and higher redshift imply a luminosity-weighted age threshhold of ~3 Gyr for SN Ia hosts, above which they are less likely to produce SNe Ia with 56Ni masses above ~0.5 M_sun. (Abridged)

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