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arXiv 2005.08982astro-ph.GAastro-ph.HEhep-ph
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毫秒脉冲星对静止星系射电-SFR关联的修正

Millisecond Pulsars Modify the Radio-SFR Correlation in Quiescent Galaxies

Takahiro Sudoh, Tim Linden, John F. Beacom

摘要:

观测到的星系远红外线光度和射电光度之间的相关性说明了恒星形成和宇宙射线产生之间的密切联系。有趣的是,最近的伽马射线观测表明,不追踪最近恒星形成的再循环/毫秒双星(MSP)也可能有效地加速宇宙射线电子。我们研究了MSPs对银河系非热射电辐射的贡献,发现它们可以主导大质量静止星系的辐射。这个模型可以解释最近的LOFAR观测发现,在具有高恒星质量和低恒星形成率的星系中存在一种特殊的无线电过剩。我们表明,基于MSP的模型提供了一个显着改善的适合LOFAR数据。我们讨论了无线电FIR相关的影响,在附近星系的无线电过剩的观测,和本地电子和正电子观测。

英文摘要:

The observed correlation between the far-infrared and radio luminosities of galaxies illustrates the close connection between star formation and cosmic-ray production. Intriguingly, recent gamma-ray observations indicate that recycled/millisecond pulsars (MSPs), which do not trace recent star formation, may also efficiently accelerate cosmic-ray electrons. We study the contribution of MSPs to the galactic non-thermal radio emission, finding that they can dominate the emission from massive quiescent galaxies. This model can explain recent LOFAR observations that found a peculiar radio excess in galaxies with high stellar masses and low star-formation rates. We show that MSP-based models provide a significantly improved fit to LOFAR data. We discuss the implications for the radio-FIR correlation, the observation of radio excesses in nearby galaxies, and local electron and positron observations.

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