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The galaxy-wide IMF of dwarf late-type to massive early-type galaxies

机译：整个银河系的矮人晚期型ImF到大型早期型星系

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Observational studies are showing that the galaxy-wide stellar initial massfunction are top-heavy in galaxies with high star-formation rates (SFRs).Calculating the integrated galactic stellar initial mass function (IGIMF) as afunction of the SFR of a galaxy, it follows that galaxies which have or whichformed with SFRs > 10 Msol yr^-1 would have a top-heavy IGIMF in excellentconsistency with the observations. Consequently and in agreement withobservations, elliptical galaxies would have higher M/L ratios as a result ofthe overabundance of stellar remnants compared to a stellar population thatformed with an invariant canonical stellar initial mass function (IMF). For theMilky Way, the IGIMF yields very good agreement with the disk- and thebulge-IMF determinations. Our conclusions are that purely stochasticdescriptions of star formation on the scales of a pc and above are falsified.Instead, star formation follows the laws, stated here as axioms, which definethe IGIMF theory. We also find evidence that the power-law index beta of theembedded cluster mass function decreases with increasing SFR. We proposefurther tests of the IGIMF theory through counting massive stars in dwarfgalaxies.
机译：观测研究表明，在具有高恒星形成率（SFR）的星系中，整个银河系恒星初始质量函数最重。计算积分银河系恒星初始质量函数（IGIMF）作为银河系SFR的函数，结果如下具有或形成SFR> 10 Msol yr ^ -1的星系将具有重载的IGIMF，这与观测值具有极好的一致性。因此，与观察结果一致，与恒星恒星初始质量函数（IMF）形成的恒星种群相比，由于恒星残留物过多，椭圆星系将具有更高的M / L比。对于银河系，IGIMF与磁盘和凸起IMF的确定具有很好的一致性。我们的结论是，在pc或更高尺度上对恒星形成的纯随机描述是伪造的，相反，恒星形成遵循定为公理的定律，该定律定义了IGIMF理论。我们还发现证据表明，嵌入的簇质量函数的幂律指数β随SFR的增加而降低。通过对矮星系中的大质量恒星计数，我们提出了对IGIMF理论的进一步测试。

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