A Widespread, Clumpy Starburst in the Isolated Ongoing Dwarf Galaxy Merger dm1647+21
G. C. Privon, S. Stierwalt, D. R. Patton, G. Besla, S. Pearson, M. Putman, K. E. Johnson, N. Kallivayalil, S. Liss
备注:
Accepted for publication in ApJ. 11 pages, 5 figures, 1 table. Figures slightly degraded to meet arXiv size restrictions. For more information about TiNy Titans see https://lavinia.as.arizona.edu/~tinytitans/
孤立的矮星系对之间的相互作用提供了一个关键的窗口,低质量等级,气体占主导地位的星系组装和恒星质量的积累在低金属系统。我们提出了第一个VLT/MUSE光学IFU的相互作用的矮对dm 1647 +21,从TiNy泰坦调查选择的意见。H $α$辐射分布广泛,对应的总无遮蔽恒星形成率(SFR)为0.44 M $_{\odot}$/年$^{-1}$,比SDSS数据推断的SFR高2.7倍。暗示特定的SFR(sSFR)的系统被提升超过一个数量级以上的非相互作用的矮星在相同的质量范围。这种增加主要是由低质量星系,其中有一个$>$ 50的sSFR增强。检查经典的光学线诊断的空间分辨地图,我们发现ISM激发可以完全解释恒星形成。电离气体的速度场与简单转动不一致。动力学模拟表明,不规则的速度场和恒星结构是一致的,该系统作为一个正在进行的两个矮星系之间的相互作用的识别。在这个系统中,恒星形成的广泛的,clusively增强指出了合并对矮星系的影响的重要差异,与大质量星系相比:而不是气体到核的漏斗并引起核星暴,低质量星系合并中的星暴可能是由大规模的ISM压缩触发的,因此更加分散。
英文摘要:
Interactions between pairs of isolated dwarf galaxies provide a critical window into low-mass hierarchical, gas-dominated galaxy assembly and the buildup of stellar mass in low-metallicity systems. We present the first VLT/MUSE optical IFU observations of the interacting dwarf pair dm1647+21, selected from the TiNy Titans survey. The H$α$ emission is widespread and corresponds to a total unobscured star formation rate (SFR) of 0.44 M$_{\odot}$ yr$^{-1}$, 2.7 times higher than the SFR inferred from SDSS data. The implied specific SFR (sSFR) for the system is elevated by more than an order of magnitude above non-interacting dwarfs in the same mass range. This increase is dominated by the lower-mass galaxy, which has a sSFR enhancement of $>$ 50. Examining the spatially-resolved maps of classic optical line diagnostics, we find the ISM excitation can be fully explained by star formation. The velocity field of the ionized gas is not consistent with simple rotation. Dynamical simulations indicate that the irregular velocity field and the stellar structure is consistent with the identification of this system as an ongoing interaction between two dwarf galaxies. The widespread, clumpy enhancements in star formation in this system point to important differences in the effect of mergers on dwarf galaxies, compared to massive galaxies: rather than the funneling of gas to the nucleus and giving rise to a nuclear starburst, starbursts in low-mass galaxy mergers may be triggered by large-scale ISM compression, and thus be more distributed.
Starbursts and dusty tori in distant 3CR radio galaxies
我们提出了一个完整的紫外到亚毫米光谱的能量分布(SED)的红移范围内的12个3CR射电星系主机$1.0 < z < 2.5$,这都是在远红外探测到的赫歇尔空间天文台的研究。该研究采用了新的光谱化学演化代码PÉGASE.3,并结合最近发表的clusianAGN环面模型。我们揭示了大质量的宿主星系恒星星族的属性,AGN环面光度,以及最近的恒星爆发的属性,这是早期推断在这些对象从他们的红外SED。PÉGASE.3拟合得到了非常明亮的(高达10 $^{13}$ L $_{\odot}$)年轻恒星星族,它们的年龄为数亿年,宿主质量超过10 $^{11}$ M $_{\odot}$。尘埃质量被认为是增加与红移,和一个令人惊讶的相关性-或更好的上信封行为-被发现之间的活动星系核环面光度和星爆光度,揭示了它们相关的尘埃成分。后者始终超过前者一个常数的因素,在一个数量级的范围内的两个数量。
Clumpy Disk, Interloper, or Merger? Nature of a Distant Galaxy Pair at 5 kpc Projected Separation
University of California, Irvine(加州大学尔湾分校);University of California, Riverside(加州大学河滨分校);California Institute of Technology(加州理工学院);The University of Texas at Austin(德克萨斯大学奥斯汀分校);Instituto de Astrofísica de Canarias(加那利群岛天体物理研究所)
RIOJA. A Clumpy Galaxy Assembly at Redshift 6.81 Revealed by JWST
Waseda University(早稻田大学);University of Tsukuba(筑波大学);Flatiron Institute(平顿研究所);The University of Tokyo(东京大学);Nagoya University(名古屋大学);Kyoto University(京都大学);Kavli Institute for the Physics and Mathematics of the Universe (WPI), UT Institute for Advanced Study, The University of Tokyo(东京大学宇宙起源研究核心(WPI)/ 基础宇宙物理学宇宙论前沿中心);Chalmers University of Technology(查尔姆斯理工大学);National Astronomical Observatory of Japan(日本国立天文台);Chiba University(千叶大学);Space Telescope Science Institute (STScI)(太空望远镜科学研究所);Graduate University for Advanced Studies (SOKENDAI)(综合研究大学院大学)
Stars Born in the Wind II: Widespread Extra-planar Star Formation in M82's Halo
University of Michigan(密歇根大学);Space Telescope Science Institute(太空望远镜科学研究所);Raytheon(雷神公司);Steward Observatory, University of Arizona(亚利桑那大学斯图尔德天文台);Universidad de La Serena(拉塞雷纳大学);Department of Astronomy, University of Washington(华盛顿大学天文学系);Center for Computational Astrophysics, Flatiron Institute(平顶山研究所计算天体物理学中心)
FOREST Unbiased Galactic plane Imaging survey with the Nobeyama 45 m telescope (FUGIN). VI. Dense gas and mini-starbursts in the W43 giant molecular cloud complex
作为FUGIN项目的一部分,我们在盾板臂($l\sim {30^\circ}$)的切线方向上对W 43巨分子云复合体进行了新的大尺度$^{12}$ CO、$^{13}$ CO和C $^{18}$ O $J=$ 1- 0观测。由$^{12}$ CO示踪的低密度气体分布在150 pc $\times$ 100 pc($l \times b$)以上,并具有大的速度弥散(20-30 km s $^{-1}$)。然而,C $^{18}$ O追踪到的致密气体位于W 43 GMC复合体中的W 43 Main、G30.5和W 43 South(G29.96-0.02)高质量恒星形成区,这些区域具有星团结构。我们发现至少有两个云的速度差$\sim$ 1 - 0 -20公里秒$^{-1}$,这两个很可能是物理上与这些高质量的恒星形成区的高$^{13}$ CO $J=$ 3-2,$J =$ 1-0的强度比和形态对应的红外尘埃排放的结果的基础上。这些云在W 43 Main、G30.5和W 43 South的速度分离太大,以至于每个云都无法被引力束缚。与W51和M17 GMC相比,W 43 GMC的致密气体具有高的局部柱密度,而整个GMC的“当前SFE”($\sim 4\%$)较低。我们认为,超音速云-云碰撞假说可以解释W 43 GMC复合体中局部小爆发和致密气体形成的起源。
Figuring Out Gas & Galaxies In Enzo (FOGGIE) XI: Circumgalactic O VI Emission Traces Clumpy Inflowing Recycled Gas
Harvard & Smithsonian(哈佛大学和史密森尼学会);Space Telescope Science Institute(太空望远镜科学研究所);Johns Hopkins University(约翰斯·霍普金斯大学);Michigan State University(密歇根州立大学);University of California Observatories/Lick Observatory(加州大学观测台/利克天文台)
Formation of Substructure in Luminous Submillimeter Galaxies (FOSSILS): Evidence of Multiple Pathways to Trigger Starbursts in Luminous Submillimeter Galaxies
SOKENDAI (The Graduate University for Advanced Studies)(综合研究大学院大学);National Astronomical Observatory of Japan(日本国立天文台);Hokkai-Gakuen University(北海学园大学);Université Paris-Saclay(巴黎萨克雷大学);Université Paris Cité(巴黎西岱大学);University of Massachusetts Amherst(马萨诸塞大学阿默斯特分校);Nagoya University(名古屋大学)
Deciphering the radio star formation correlation on kpc scales II. The integrated infrared-radio continuum and star formation - radio continuum correlations
Selecting Post-Starburst Galaxies Based on Star Formation History
University of Maryland(马里兰大学);University of Illinois Urbana-Champaign(伊利诺伊大学厄巴纳-香槟分校);Universidad Diego Portales(迭戈波特莱斯大学);Universidad Nacional Autonóma de México(墨西哥国立自治大学);Instituto de Astrofísica de Canarias(加那利天体物理研究所)
A Post-starburst Galaxy Undergoing Ram-pressure Stripping at Redshift 3.06
Tsinghua University(清华大学);National Radio Astronomy Observatory(国家射电天文台);University of Alabama in Huntsville(阿拉巴马大学亨茨维尔分校);European Southern Observatory(欧洲南方天文台);Cosmic Dawn Center (DAWN), Niels Bohr Institute, University of Copenhagen(哥本哈根大学尼尔斯·玻尔学院宇宙黎明中心(DAWN));Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo(东京大学前沿研究综合科学中心 Kavli宇宙物理数学研究所(WPI));Center for Data-Driven Discovery, Kavli IPMU (WPI), UTIAS, The University of Tokyo(东京大学 UTIAS Kavli IPMU 数据驱动发现中心)
BLUEPRINT: Blue-dominant Lyman-$α$ emission as evidence of gas inflow in ultra-low-mass galaxies at z = 3
Macquarie University(麦考瑞大学);Johns Hopkins University(约翰斯·霍普金斯大学);Swinburne University of Technology(斯威本科技大学);Università degli Studi di Milano-Bicocca(米兰比可卡大学);Centro de Astrobiología (CAB), CSIC-INTA(天体生物学中心(CAB),西班牙国家研究委员会-国家航空航天技术研究所)