The Morphology of Dust-Obscured Starbursts: the e-MERLIN SuperCLASS Legacy Survey

尘埃遮蔽星暴的形态：e-MERLIN SuperCLASS 遗产调查

• 批准号: 1714528
• 负责人: Caitlin Casey
• 金额: $ 15.22万
• 依托单位: University of Texas at Austin
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-08-15 至 2020-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1714528&HistoricalAwards=false
• 关键词: Morphology; Dust; Obscured; Starbursts; MERLIN

Galaxies -- collections of hundreds of billions of stars all bound by gravity -- are a fundamental building block in the evolution of our Universe. Our own Milky Way galaxy is regarded as 'normal' in the Universe today, stretching 100,000 light years across and forming stars at a rate of 1-2 new suns per year. But, as we look farther out into the Universe, it seems that galaxies in the distant past (10 billion years ago) were dramatically different. Extreme "starbursting" galaxies that produced 100 to 2,000 stars per year were much more typical, and most stars formed at that time came from such starbursts. The awarded team is trying to determine why these galaxies were so important in the Universe's history and why they are so extreme, for example whether or not they are caused by the catastrophic collision of two smaller galaxies, or whether the gas (the fuel needed to power star formation) was more dense and efficient when the Universe was much younger. These extreme starbursts are also heavily obscured by dust, making them hard to see in optical light visible to our eyes. Cutting edge radio-wavelength data from the e-MERLIN telescope will be used to peer through the dust and determine the powering mechanism for the Universe's most extreme starbursting galaxies. This project will support the retention of under-represented students in astrophysics research through participation in the TAURUS program at UT Austin, where undergraduate students spend nine weeks of the summer on a research project. The awardee will be proactive in engaging and supporting under-represented students in communities like TAURUS.With a unique data set of high-resolution (0."1) deep (4 uJy) radio 1.4 GHz continuum data from e-MERLIN covering 1.77 deg^2 in the SuperCLASS field, the awardees will assess the evolutionary origins of highly-obscured radio galaxies in a statistically large sample (few x 100) out to z~3. The objectives are to answer the following questions: (1) Are the high-SFRs in dusty starbursts primarily driven by galaxy interactions or not? (2) Does feedback from Active Galactic Nuclei (AGN) in obscured starbursts play a role in suppressing star-formation? Or is there no discernible difference in star formation seen in starbursts with or without radio-luminous AGN (and what is the dependence on the AGN luminosity)? (3) What do galaxies' star-formation surface densities tell us about the intensity of star formation and relative obscuration geometries (when compared to optical imaging)? (4) Can one learn about the physical origins of the mysterious far-infrared/radio correlation by analyzing galaxies' radio synchrotron slope and radio morphologies? Answering these questions through direct morphological analysis of the e-MERLIN SuperCLASS data products will have significant impact on galaxy evolution studies.

星系 - 数千亿颗恒星都受重力束缚的集合 - 是我们宇宙发展中的基本构建基础。 我们自己的银河系在当今的宇宙中被认为是“正常”的，每年以1-2的新太阳延伸了100,000光年，并形成恒星。 但是，随着我们向宇宙的看法，似乎遥远的过去（100亿年前）的星系在很大程度上有所不同。 每年产生100至2,000颗恒星的极端“ Starbursting”星系更为典型，当时大多数恒星都来自这样的Starburst。 颁发的团队试图确定为什么这些星系在宇宙的历史中如此重要，以及为什么它们如此极端，例如，它们是否是由两个较小星系的灾难性碰撞引起的，或者当宇宙年轻时，宇宙是否更繁殖，是否更加浓密。 这些极端的星光爆发也被灰尘遮盖了，使它们在我们眼睛可见的光学光中很难看到。 E-Merlin望远镜的尖端无线电波长数据将用于通过灰尘凝视，并确定宇宙最极端星际星系的动力机理。 该项目将通过参加UT Austin的金牛座计划来支持代表性不足的天体物理学研究学生的保留，本科生在夏季的九个星期在研究项目上花费了9周的时间。 获奖者将积极参与和支持金牛座等社区中代表性不足的学生。与高分辨率（0. 4）深（4 ujy）无线电1.4 GHz连续数据的独特数据集覆盖1.77 ghz连续数据，涵盖1.77 deg 2的超级类别，奖项将评估超级范围的高级统计范围。 z〜3。 （3）星系的恒星表面密度如何告诉我们恒星形成的强度和相对晦涩的几何形状（与光学成像相比）？产品将对星系进化研究产生重大影响。

项目成果

SuperCLASS – I. The super cluster assisted shear survey: Project overview and data release 1

• DOI: 10.1093/mnras/staa709
• 发表时间: 2020-02
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: R. Battye;Michael L. Brown;C. Casey;I. Harrison;N. Jackson;I. Smail;R. Watson;C. Hales;C. Hales;S. Manning;C. Hung;C. Riseley;C. Riseley;F. Abdalla;M. Birkinshaw;C. Demetroullas;S. Chapman;R. Beswick;T. Muxlow;A. Bonaldi;S. Camera;T. Hillier;S. Kay;A. Peters;D. Sanders;Daniel B. Thomas;A. Thomson;B. Tunbridge;L. Whittaker

SuperCLASS – III. Weak lensing from radio and optical observations in Data Release 1

• DOI: 10.1093/mnras/staa696
• 发表时间: 2020-03
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: I. Harrison;I. Harrison;Michael L. Brown;B. Tunbridge;Daniel B. Thomas;T. Hillier;Alasdair Thomson;L. Whittaker;L. Whittaker;F. Abdalla;R. Battye;A. Bonaldi;S. Camera;S. Camera;C. Casey;C. Demetroullas;C. Demetroullas;Christopher A. Hales;Christopher A. Hales;N. Jackson;S. Kay;S. Manning;A. Peters;C. Riseley;C. Riseley;R. Watson

SuperCLASS – II. Photometric redshifts and characteristics of spatially resolved μJy radio sources

SuperCLASS – II。

• DOI: 10.1093/mnras/staa657
• 发表时间: 2020
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Manning, Sinclaire M;Casey, Caitlin M;Hung, Chao-Ling;Battye, Richard;Brown, Michael L;Jackson, Neal;Abdalla, Filipe;Chapman, Scott;Demetroullas, Constantinos;Drew, Patrick
• 通讯作者: Drew, Patrick