A more direct measure of supernova rates in starburst galaxies
A more direct measure of supernova rates in starburst galaxies
复制标题
更直接地测量星暴星系中的超新星发生率
DOI：
10.1086/174515
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发表时间：
1994
期刊：
影响因子：
--
通讯作者：
M. Greenhouse
中科院分区：
文献类型：
--
作者：
D. Buren;M. Greenhouse
我们通过应用Chevalier的超新星爆炸波扩展到其前体恒星的抛射物的射电发射模型，确定了星爆星系M82和NGC 253中年轻超新星遗迹的年龄。绝对年龄是通过对Cas a的射电观测校准模型来确定的。我们得出M82和NGC 253的超新星速率分别为0.10和0.08/年。假设L（子FIR）与超新星速率成正比，我们发现r（子SN）大约等于2 × 10（exp -12） × L（子FIR），这些原型星暴星系的太阳年（exp -1）。这种方法的独特之处在于，超新星的速率是由对超新星遗迹的直接观测得出的，而不是由恒星形成速率和假设的初始质量函数（IMF）得出的。我们认为，这里提出的方法可以用来得出恒星形成速率，与其他方法得出的结果相比，它与可观测量的关系更直接。我们发现M82星爆的超新星速率、远红外亮度和动态质量对初始质量函数斜率和质量极限的限制很小。
We determine ages for young supernova remnants in the starburst galaxies M82 and NGC 253 by applying Chevalier's model for radio emission from supernova blast waves expanding into the ejecta of their precursor stars. Absolute ages are determined by calibrating the model with radio observations of Cas A. We derive supernova rates of 0.10 and 0.08/yr for M82 and NGC 253, respectively. Assuming L (sub FIR) to be proportional to the supernova rate, we find r(sub SN) approximately equal 2 x 10(exp -12) x L(sub FIR), solar yr(exp -1) for these archetypal starburst galaxies. This approach is unique in that the supernova rate is derived from direct observation of supernova remnants rather than from star formation rates and an assumed initial mass function (IMF). We suggest that the approach presented here can be used to derive star-formation rates that are more directly related to observable quantities than those derived by other methods. We find that the supernova rate, far infrared (FIR) luminosity, and dynamical mass of the M82 starburst place few constraints on the initial mass function (IMF) slope and mass limits.