用 ASKAP RACS 探测到的最大规模早期型星系的射电连续波

IF 4.5 3区物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS

Publications of the Astronomical Society of Australia Pub Date : 2023-12-15 DOI:10.1017/pasa.2023.62

Michael J. I. Brown, Teagan A. Clarke, Andrew M. Hopkins, Ray P. Norris, T.H. Jarrett

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引用次数: 0

摘要

所有质量非常大的早期型星系都包含超大质量黑洞，但是这些黑洞是否都足够活跃，从而产生可探测到的射电连续波源呢？我们利用 887.5 MHz 快速 ASKAP 连续巡天 DR1 测量了从 2MASS 红移巡天、HyperLEDA 和 RC3 中选取的亮度大于 KS = 9.5 的形态早期型星系的射电辐射。与之前的研究结果一致，我们发现中值射电功率随着红外光度的增加而增加，尽管这种关系的散度跨越了几个数量级。在我们的样本中，所有 40 个 MK < -25.7 早期型星系测量到的射电通量密度都比背景噪声高出 2α 以上，1.4 GHz 射电功率跨度为 .将我们的样本与早期型星系的积分场光谱进行交叉比对后发现，最强大的射电源优先存在于角动量相对较小的星系中（即慢速旋转星系）。虽然我们早期类型样本中大多数星系的红外颜色与恒星形成可以忽略不计的被动星系以及活动星系核或 AGN 残余物产生的射电辐射一致，但极低水平的恒星形成可以为最弱的射电源提供能量，而对许多其他恒星形成率示踪物几乎没有影响。

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Radio continuum from the most massive early-type galaxies detected with ASKAP RACS

All very massive early-type galaxies contain supermassive blackholes but are these blackholes all sufficiently active to produce detectable radio continuum sources? We have used the 887.5 MHz Rapid ASKAP Continuum Survey DR1 to measure the radio emission from morphological early-type galaxies brighter than KS = 9.5 selected from the 2MASS Redshift Survey, HyperLEDA and RC3. In line with previous studies, we find median radio power increases with infrared luminosity, with although the scatter about this relation spans several orders of magnitude. All 40 of the MK < −25.7 early-type galaxies in our sample have measured radio flux densities that are more than 2α above the background noise, with 1.4 GHz radio powers spanning . Cross matching our sample with integral field spectroscopy of early-type galaxies reveals that the most powerful radio sources preferentially reside in galaxies with relatively low angular momentum (i.e. slow rotators). While the infrared colours of most galaxies in our early-type sample are consistent with passive galaxies with negligible star formation and the radio emission produced by active galactic nuclei or AGN remnants, very low levels of star formation could power the weakest radio sources with little effect on many other star formation rate tracers.

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来源期刊

Publications of the Astronomical Society of Australia 地学天文-天文与天体物理

CiteScore

5.90

自引率

9.50%

发文量

审稿时长

>12 weeks

期刊介绍： Publications of the Astronomical Society of Australia (PASA) publishes new and significant research in astronomy and astrophysics. PASA covers a wide range of topics within astronomy, including multi-wavelength observations, theoretical modelling, computational astronomy and visualisation. PASA also maintains its heritage of publishing results on southern hemisphere astronomy and on astronomy with Australian facilities. PASA publishes research papers, review papers and special series on topical issues, making use of expert international reviewers and an experienced Editorial Board. As an electronic-only journal, PASA publishes paper by paper, ensuring a rapid publication rate. There are no page charges. PASA''s Editorial Board approve a certain number of papers per year to be published Open Access without a publication fee.