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arXiv 2406.04547astro-ph.GA
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RESOLVE巡天中z=0处金块星系的识别与淬灭

Identification and Quenching of Nugget Galaxies in the RESOLVE Survey at z = 0

Derrick S. Carr, Sheila J. Kannappan, Mark A. Norris, Manodeep Sinha, Michael L. Palumbo, Kathleen D. Eckert, Amanda J. Moffett, Mugdha S. Polimera, Joel I. Ber… 展开作者

Derrick S. Carr, Sheila J. Kannappan, Mark A. Norris, Manodeep Sinha, Michael L. Palumbo, Kathleen D. Eckert, Amanda J. Moffett, Mugdha S. Polimera, Joel I. Bernstein, Zackary L. Hutchens

AI总结:

本文在RESOLVE巡天中系统普查z=0金块星系,通过结构与环境标准筛选样本,首次从观测上证实其淬灭机制随质量变化并由AGN介导,从周期性暂时淬灭转变为晕淬灭。

摘要:

我们给出了在体积受限的z~0本地体积分辨光谱巡天(RESOLVE)中候选金块星系的完整普查,金块星系是指可能由强烈气体流入引发的致密化过程形成的致密星系。这些金块星系涵盖了所有演化阶段,并且恒星质量跨越3个数量级(M*约10^8 M⊙至10^11 M⊙),从矮星系到巨星系范围。我们基于结构制定了z~0候选金块星系的选择标准,并引入环境标准以排除具有疑似非致密化起源的金块状天体。由此得到的z~0金块星系在结构(即密度、尺寸)、群体出现频率和可能起源方面符合预期。我们表明,我们的金块星系普查性质与以下图景一致:在气体富集度阈值尺度以上(晕质量Mhalo约10^11.4 M⊙)发生永久性淬灭,在该阈值尺度以下发生周期性暂时淬灭,并且活动星系核(AGN)反馈有助于永久性淬灭。正如模拟所预测的,大多数金块星系在晕质量范围Mhalo约10^11.45 M⊙至10^11.9 M⊙内淬灭。我们发现阈值尺度以下的候选蓝色金块星系在恒星形成主序带周围存在约0.29 dex的弥散,这与模拟中所见的暂时淬灭一致。在阈值尺度以上出现了一个过渡性的绿色金块星系群体。在该尺度以上的金块星系中,AGN也变得更加常见,并且我们观察到与可比选择的非金块星系相比,金块星系中可能存在AGN超出。我们的结果首次从观测上证实了金块星系中存在依赖质量的、由AGN介导的从周期性淬灭到晕淬灭的转变。

英文摘要:

We present a complete census of candidate nuggets, i.e., dense galaxies likely formed by compaction with intense gas influx, within the volume-limited $z \sim 0$ REsolved Spectroscopy Of a Local VolumE (RESOLVE) survey. These nuggets span all evolutionary stages and 3 orders of magnitude in stellar mass ($M_{*} \sim 10^{8} M_\odot$ to $10^{11} M_\odot$) from the dwarf to the giant regime. We develop selection criteria for our $z\sim0$ nugget candidates based on structure and introduce the use of environmental criteria to eliminate nugget-like objects with suspected non-compaction origins. The resulting $z\sim0$ nuggets follow expectations with respect to structure (i.e., density, size), population frequency, and likely origins. We show that the properties of our nugget census are consistent with permanent quenching above the gas-richness threshold scale (halo mass $M_{halo} \sim 10^{11.4} M_\odot$), cyclic temporary quenching below the threshold scale, and feedback from active galactic nuclei (AGN) assisting in permanent quenching. As predicted in simulations, most nuggets quench within the halo mass range $M_{halo} \sim 10^{11.45} M_\odot$ to $10^{11.9} M_\odot$. We find $\sim 0.29$ dex scatter around the star-forming main sequence for candidate blue nuggets below the threshold scale, which is consistent with temporary quenching as seen in simulations. A transitional population of green nuggets appears above the threshold scale. AGN also become more common in nuggets above this scale, and we see a likely AGN excess in nuggets vs. comparably selected non-nuggets. Our results provide the first observational confirmation of the mass-dependent, AGN-mediated shift from cyclic quenching to halo quenching in nuggets.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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