Star formation histories of the LEGUS dwarf galaxies (III): the non-bursty nature of 23 star forming dwarf galaxies
M. Cignoni, E. Sacchi, M. Tosi, A. Aloisi, D. O. Cook, D. Calzetti, J. C. Lee, E. Sabbi, D. A. Thilker, A. Adamo, D. A. Dale, B. G. Elmegreen, J. S. Gallagher, … 展开作者
M. Cignoni, E. Sacchi, M. Tosi, A. Aloisi, D. O. Cook, D. Calzetti, J. C. Lee, E. Sabbi, D. A. Thilker, A. Adamo, D. A. Dale, B. G. Elmegreen, J. S. Gallagher, E. K. Grebel, K. E. Johnson, M. Messa, L. J. Smith, L. Ubeda
备注:
29 pages, 19 figures, accepted for publication in ApJ
We derive the recent star formation histories of 23 active dwarf galaxies using HST observations from the Legacy Extragalactic UV Survey (LEGUS). We apply a color-magnitude diagram fitting technique using two independent sets of stellar models, PARSEC-COLIBRI and MIST. Despite the non-negligible recent activity, none of the 23 star forming dwarfs show enhancements in the last 100 Myr larger than three times the 100-Myr-average. The unweighted mean of the individual SFHs in the last 100 Myr is also consistent with a rather constant activity, irrespective of the atomic gas fraction. We confirm previous results that for dwarf galaxies the CMD-based average star formation rates (SFRs) are generally higher than the FUV-based SFR. For half of the sample, the 60-Myr-average CMD-based SFR is more than two times the FUV SFR. In contrast, we find remarkable agreement between the 10-Myr-average CMD-based SFR and the H$α$-based SFR. Finally, using core helium burning stars of intermediate mass we study the pattern of star formation spatial progression over the past 60 Myr, and speculate on the possible triggers and connections of the star formation activity with the environment in which these galaxies live. Approximately half of our galaxies show spatial progression of star formation in the last 60 Myr, and/or very recent diffuse and off-center activity compared to RGB stars.
NIRSpec View of the Appearance and Evolution of Balmer Breaks and the Transition from Bursty to Smooth Star Formation Histories from Deep Within the Epoch of Reionization to Cosmic Noon
JADES: Differing assembly histories of galaxies -- Observational evidence for bursty SFHs and (mini-)quenching in the first billion years of the Universe
Star Cluster Catalogs for the LEGUS Dwarf Galaxies
本文介绍了$HST$财政部计划“银河系外紫外线巡天”(LEGUS)中17个矮星系和不规则星系的星团表。在这个子样本的集群识别和测光是类似的整个LEGUS样本,但特殊的方法被开发,以提供强大的目录与准确的通量,由于低集群统计。对于两种广泛使用的孔径校正,颜色和年龄在很大程度上是一致的,但是很大一部分聚类比平均训练聚类更紧凑。然而,集合光度,质量和年龄分布是一致的,这表明两种方法之间的系统性小于随机误差。当与以前的矮星系样本的集群相比,我们发现,LEGUS目录更完整,提供更准确的总流量。将所有的星系团组合成一个复合矮星系,我们发现星系团的光度和质量函数可以用正则指数为$-2$的幂律函数来描述,而与年龄和全局SFR分级无关。年龄分布呈幂律下降,指数为$\approx-0.80\pm0.15$,与星团质量和全球SFR分级无关。这种星系团的衰落主要是由于星系团的分裂,因为在过去的几百万年里,恒星形成历史和积分光SFR都是近似恒定的。最后,我们发现一个上质量截断($<2σ$)的复合集群质量函数的证据很少,可以排除截断质量低于$\approx10^{4.5}$ M $_{\odot}$,但不能排除存在截断在更高的质量。
Caught Napping by JWST UNCOVER+MegaScience: Constraining bursty star formation histories and number densities of mini-quenched galaxies at redshifts 4-7
University of Washington(华盛顿大学);University of Pittsburgh(匹兹堡大学);University of Colorado, Boulder(科罗拉多大学博尔德分校);University of California, Santa Cruz(加州大学圣克鲁兹分校);Princeton University(普林斯顿大学)
The Star-forming Main Sequence and Bursty Star-formation Histories at $z>1.4$ in JADES and AURORA
University of California, Los Angeles(加州大学洛杉矶分校);Steward Observatory, University of Arizona(亚利桑那大学斯图尔德天文台);Cosmic Dawn Center (DAWN)(宇宙黎明中心);Niels Bohr Institute, University of Copenhagen(哥本哈根大学尼尔斯玻尔研究所);University of Kentucky(肯塔基大学);Department of Physics & Astronomy, University of California, Riverside(加州大学河滨分校物理与天文学系)
It's More Complicated Than You Think: A Forward Model to Infer the Recent Star Formation History, Bursty or Not, of Galaxy Populations
The Pennsylvania State University(宾夕法尼亚州立大学);Princeton University(普林斯顿大学);Wesleyan University(卫斯理安大学);Columbia University(哥伦比亚大学);Flatiron Institute(平井研究所)
Measuring the delay time distribution of binary neutron stars. III. Using the individual star formation histories of gravitational wave event host galaxies in the local universe
在论文I(Safarzadeh & Berger 2019)中,我们研究了通过晕/恒星质量与本地宇宙中承载引力波(GW)事件的星系的恒星形成历史(SFH)之间的标度关系来确定双星中子星(BNS)的延迟时间分布(DTD)。在这里,我们将探讨如何详细重建的BNS合并宿主星系的单个SFH可以提高使用的标度关系。我们使用星系和质量大会(GAMA)调查,这是质量完整的$M_*>10^9$ M $_\odot$在红移范围$0.05<z<0.08$的星系。我们使用重建的SFH来自探矿者代码,为两个不同的先验集合(有利于连续和突发SFH),卷积那些与幂律DTDs的特征在于一个指数$Γ$和最小延迟时间$t_{\rm min}$。我们发现,这种方法的$\mathcal{O}(100)-\mathcal{O}(300)$主机星系需要约束的DTD参数,与数量取决于选择的SFH前和真正的DTD的参数。我们进一步表明,只使用BNS合并的宿主星系,而不是在相关的宇宙体积的潜在的宿主星系的全部人口,导致在恢复的DTD参数的微小偏差。相对于使用标度关系的方法,所需的宿主星系样本大小几乎要小一个数量级,我们预计在第三代GW探测器出现之前,在十年或二十年内收集到这样的宿主星系样本。
MUSE-DARK IV. Comparing Dark Matter Densities to Star Formation Histories in 375 intermediate-z galaxies
Université Lyon 1, ENS de Lyon, CNRS, CRAL(里昂第一大学,巴黎高等师范学院里昂分校,法国国家科学研究中心,里昂银河系与天体物理实验室);Leibniz-Institut für Astrophysik Potsdam (AIP)(波茨坦莱布尼茨天体物理研究所);Univ. de Strasbourg, CNRS, Observatoire astronomique de Strasbourg(斯特拉斯堡大学,法国国家科学研究中心,斯特拉斯堡天文台);Institute of Cosmology & Gravitation, University of Portsmouth(朴茨茅斯大学宇宙学与引力研究所)
SPURS: Bursty Star Formation in an Extremely Luminous Weak Emission Line Galaxy at $z=9.3$
Niels Bohr Institute, University of Copenhagen(哥本哈根大学尼尔斯·玻尔研究所);Department of Astronomy, University of California, Berkeley(加州大学伯克利分校天文学系);Ecole Polytechnique Federale de Lausanne(洛桑联邦理工学院);The Observatories of the Carnegie Institution for Science(卡内基科学促进会天文台);Department of Astronomy, The University of Texas at Austin(德克萨斯大学奥斯汀分校天文学系)
UNCOVER/MegaScience Finds Uniform and Highly Bursty Star Formation at 3 < z < 9, consistent with the High-Redshift UV Luminosity Function
University of Colorado, Boulder(科罗拉多大学博尔德分校);The Pennsylvania State University(宾夕法尼亚州立大学);University of Pittsburgh(匹兹堡大学);Princeton University(普林斯顿大学);University of Washington(华盛顿大学);Swinburne University of Technology(斯威本科技大学);Space Telescope Science Institute (STScI)(太空望远镜科学研究所);MIT Kavli Institute for Astrophysics and Space Research(麻省理工学院卡弗里天体物理与空间研究所);Kapteyn Astronomical Institute, University of Groningen(格罗宁根大学卡普坦天文研究所);University of Toronto(多伦多大学);University of Zurich(苏黎世大学);The University of Texas at Austin(德克萨斯大学奥斯汀分校);Ben-Gurion University of the Negev(内盖夫本-古里安大学);University of California, Berkeley(加州大学伯克利分校);Cosmic Dawn Center (DAWN), Niels Bohr Institute, University of Copenhagen(哥本哈根大学尼尔斯·玻尔研究所宇宙黎明中心(DAWN));University of Massachusetts, Amherst(马萨诸塞大学阿默斯特分校);Tufts University(塔夫茨大学)
UNCOVER/MegaScience 发现 3 < z < 9 范围内恒星形成具有均匀且高度爆发性,与高红移紫外光度函数一致。
The Nearby Star Formation and Supernova Histories Reconstructed from Young Star Clusters
Center for Astrophysics — Harvard & Smithsonian(天体物理中心——哈佛与史密森尼学会);Department of Astrophysics, University of Vienna(维也纳大学天体物理学系);Department of Physics, University of Wisconsin–Whitewater(威斯康星大学惠特沃分校物理系)
REBELS-IFU: Steeply rising star formation histories and the importance of dust obscuration in massive $z \simeq7$ galaxies revealed by multi-wavelength observations
The THESAN-ZOOM project: central starbursts and inside-out quenching govern galaxy sizes in the early Universe
University of Cambridge(剑桥大学);The University of Texas at Dallas(德克萨斯大学达拉斯分校);York University(约克大学);Leibniz-Institut für Astrophysik Potsdam(波茨坦阿佩尔天体物理研究所);University of Pennsylvania(宾夕法尼亚大学);The University of Tokyo(东京大学);Institute for Fundamental Physics of the Universe(基础宇宙物理研究所);University of Edinburgh(爱丁堡大学)