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arXiv 1601.00344astro-ph.GA
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局域宇宙中反馈的约束：早型星系中恒星形成与AGN活动的关系

Constraints on Feedback in the local Universe: The relation between star formation and AGN activity in early type galaxies

Sravani Vaddi, Christopher P. ODea, Stefi A. Baum, Samantha Whitmore, Rabeea Ahmed, Katherine Pierce, Sara Leary

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Accepted in ApJ
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摘要：

利用紫外、红外和射电的观测资料，对231个邻近（$0.0002<z<0.0358$）早型星系进行了多波长研究，讨论了恒星形成与活动星系核活动之间的关系。我们的结果表明，在当前的时代早型星系很少有强大的活动星系核，与$P<10^{22}\,WHz^{-1}$为大多数的星系。只有大质量的星系才能拥有强大的射电源，而质量较小的星系则拥有较低的射电源。在大约7%的样本中可以看到正在形成的恒星。这些星系的SFR小于0.1 $M_{\odot}yr^{-1}$。它们也往往是无线电微弱（$P<10^{22}\,WHz^{-1}$）。在射电暗星系（$P<10^{22}\,WHz^{-1}$）和射电亮星系（$P\geq10^{22}\,WHz^{-1}$）中有几乎相等比例的恒星形成星系，这表明在我们的样本中恒星形成和射电模式反馈都被限制在非常低的水平。我们注意到，我们的星系样本和布里渊星系团（BCGs）在射电功率与SFR之间遵循类似的趋势。如果射电功率和SFR都与恒星质量有关，这可能会产生。

英文摘要：

We address the relation between star formation and AGN activity in a sample of 231 nearby ($0.0002<z<0.0358$) early type galaxies by carrying out a multi-wavelength study using archival observations in the UV, IR and radio. Our results indicate that early type galaxies in the current epoch are rarely powerful AGNs, with $P<10^{22}\,WHz^{-1}$ for a majority of the galaxies. Only massive galaxies are capable of hosting powerful radio sources while less massive galaxies are hosts to lower radio power sources. Evidence of ongoing star formation is seen in approximately 7% of the sample. The SFR of these galaxies is less than 0.1 $M_{\odot}yr^{-1}$. They also tend to be radio faint ($P<10^{22}\,WHz^{-1}$). There is a nearly equal fraction of star forming galaxies in radio faint ($P<10^{22}\,WHz^{-1}$) and radio bright galaxies ($P\geq10^{22}\,WHz^{-1}$) suggesting that both star formation and radio mode feedback are constrained to be very low in our sample. We notice that our galaxy sample and the Brightest Cluster Galaxies (BCGs) follow similar trends in radio power versus SFR. This may be produced if both radio power and SFR are related to stellar mass.

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