LeMMINGs V. Nuclear activity and bulge properties: A detailed multi-component decomposition of e -MERLIN Palomar galaxies with HST
LeMMINGs V. Nuclear activity and bulge properties: A detailed multi-component decomposition of e -MERLIN Palomar galaxies with HST
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LeMMINGs V. 核活动和核球特性：利用 HST 对 e-MERLIN Palomar 星系进行详细的多组分分解
DOI：
10.1051/0004-6361/202345913
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发表时间：
2023
影响因子：
6.5
通讯作者：
Dullo B
中科院分区：
文献类型：
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作者：
Dullo B
我们使用高分辨率HST成像和来自LeMMINGs调查的星系核心的1.5 ghz观测数据来研究大样本星系的光学结构特性与核射电发射之间的关系。我们对163个LeMMINGs星系的HST图像提取的新表面亮度剖面进行了精确的多组分分解，并将多达6个星系组分（如凸起、盘状、AGN、棒状、环状、旋臂和核星团）与ssamrsic和/或核心ssamrsic模型同时拟合。通过添加我们过去工作中10个LeMMINGs星系的分解数据，我们得到了173个附近星系（102 s, 42 s, 23 e，加上6 Irr）的最终样本，这些星系的典型凸起恒星质量为m *，凸起~ 106−1012.5M⊙，包含了所有的光谱类别：低电离核发射线区（LINER）， Seyfert，吸收线星系（ALG）和H II。我们表明，在许多星系中，当棒状、环状和螺旋形等成分不包括在拟合中时，凸起的质量可能被显著高估。我们还实现了蒙特卡罗方法来确定凸起，圆盘和其他拟合结构参数的误差。在哈勃序列中（从相反的方向）移动，即从不规则星系到椭圆星系，我们确认凸起变得更大，更突出，更圆。这种突出的优势与更亮的射电核心光度有关。我们还发现，射电探测分数随着凸起质量的增加而增加。AtM *，凸起≥1011M⊙，无线电探测率为77%，下降至24%；此外，我们观察到核- ssamrsic凸起趋向于系统的圆形，具有高射电核亮度和盒形扭曲或纯椭圆同质团。然而，没有证据证明先前声称的星系中心结构（即一个尖锐的ssamrsic，核心- ssamrsic二分法）与它们的无线电响度，等速形状和平坦性有强烈的趋势。
We used high-resolution HST imaging ande-MERLIN 1.5-GHz observations of galaxy cores from the LeMMINGs survey to investigate the relation between optical structural properties and nuclear radio emission for a large sample of galaxies. We performed accurate, multi-component decompositions of new surface brightness profiles extracted from HST images for 163 LeMMINGs galaxies and fitted up to six galaxy components (e.g. bulges, discs, AGN, bars, rings, spiral arms, and nuclear star clusters) simultaneously with Sérsic and/or core-Sérsic models. By adding such decomposition data for ten LeMMINGs galaxies from our past work, the final sample of 173 nearby galaxies (102 Ss, 42 S0s, 23 Es, plus six Irr) with a typical bulge stellar mass ofM∗,bulge∼ 106− 1012.5M⊙encompasses all optical spectral classes: low-ionisation nuclear emission-line region (LINER), Seyfert, Absorption Line Galaxy (ALG), and H II. We show that the bulge mass can be significantly overestimated in many galaxies when components such as bars, rings, and spirals are not included in the fits. We additionally implemented a Monte Carlo method to determine errors on the bulge, disc, and other fitted structural parameters. Moving (in the opposite direction) across the Hubble sequence, that is from the irregular to elliptical galaxies, we confirm that bulges become larger, more prominent, and round. Such bulge dominance is associated with a brighter radio core luminosity. We also find that the radio detection fraction increases with bulge mass. AtM∗,bulge≥ 1011M⊙, the radio detection fraction is 77%, declining to 24% forM∗,bulge< 1010M⊙. Furthermore, we observe that core-Sérsic bulges tend to be systematically round and to possess high radio core luminosities and boxy-distorted or pure elliptical isophotes. However, there is no evidence for the previously alleged strong tendency of galaxies’ central structures (i.e. a sharp Sérsic, core-Sérsic dichotomy) with their radio loudness, isophote shape, and flattening.