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The intrinsic SFRF and sSFRF of galaxies:comparing SDSS observation with IllustrisTNG simulation

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Research in Astronomy and Astrophysics 2020年第12期20卷 229-242页

作者： Ping Zhao Haojie Xu antonios katsianis Xiao-Hu Yang Department of Astronomy School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China Tsung-Dao Lee Institute and Shanghai Key Laboratory for Particle Physics and CosmologyShanghai Jiao Tong UniversityShanghai 200240China

The star formation rate function(SFRF) and specific star formation rate function(s SFRF) from observations are impacted by the Eddington bias, due to uncertainties in the estimated star formation rate(SFR). We develop a novel method to correct the Eddington bias and obtain the intrinsic SFRF and sSFRF from the Sloan Digital Sky Survey(SDSS) Data Release 7. The intrinsic SFRF is in good agreement with measurements from previous data in the literature that relied on UV SFRs but its high star-forming end is slightly lower than the corresponding IR and radio tracers. We demonstrate that the intrinsic sSFRF from SDSS has a bimodal form with one peak found at sSFR ~10-9.7 yr^-1 representing the star-forming objects while the other peak is found at sSFR ~10-12 yr^-1 representing the quenched population. Furthermore, we compare our observations with the predictions from the Illustris TNG and Illustris simulations and affirm that the "TNG" model performs much better than its predecessor. However,we show that the simulated SFRF and CSFRD of TNG simulations are highly dependent on resolution,reflecting the limitations of the model and today’s state-of-the-art simulations. We demonstrate that the bimodal, two peaked s SFRF implied by the SDSS observations does not appear in TNG regardless of the adopted box-size or resolution. This tension reflects the need for inclusion of an additional efficient quenching mechanism in the TNG model.

关键词： statistical galaxies:formation galaxies:distances and redshifts hydrodynamics

Detection of a possible superluminous supernova in the Epoch of Reionization

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Science Bulletin 2017年第10期62卷 675-678页

作者： Jeremy Mould Tim Abbott Jeff Cooke Chris Curtin antonios katsianis Anton Koekemoer Edoardo Tescari Syed Uddin Lifan Wang Stuart Wyithe Centre for Astrophysical & Supercomputing Swinburne University Hawthorn 3122 Australia Cerro Tololo lnteramerican Observatory NOAO La Serena Chile Space Telescope Science Institute Baltimore MD 21218 USA Purple Mountain Observatory Chinese Academy of Sciences Nanjing 210008 China Texas A&M University College Station 7X 77843 USA University of Melbourne School of Physics Melbourne 3010 Australia Departamento de Astronornia Universidad de Chile Los Condes Santiago. Chile

The Epoch of Reionization(EoR)poses a number of puzzles,including the sufficiency of ionizing radiation,the rapid production of supermassive black holes and the early appearance of abundant metals in larger *** the first of these,solutions focus on the main sequence evolution of massive stars,but the second and third puzzles involve the terminal phase of stellar evolution,

关键词：超新星再电离大质量恒星检测光度恒星演化电离辐射 EOR

DESI Legacy Imaging Surveys Data Release 9:Cosmological constraints from galaxy clustering and weak lensing using the minimal bias model

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Science China(Physics,Mechanics & Astronomy) 2023年第12期66卷 230-254页

作者： Haojie Xu Hekun Li Jun Zhang Xiaohu Yang Pengjie Zhang Min He Yizhou Gu Jian Qin Zhaozhou Li antonios katsianis Ji Yao Zhaoyu Wang Yirong Wang Liping Fu Department of Astronomy Shanghai Jiao Tong UniversityShanghai 200240China Key Laboratory for Particle Astrophysics and Cosmology(MOE)/Shanghai Key Laboratory for Particle Physics and Cosmology Shanghai 200240China Tsung-Dao Lee Institute Shanghai Jiao Tong UniversityShanghai 201210China CAS Key Laboratory of Optical Astronomy National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China Centre for Astrophysics and Planetary Science Racah Institute of PhysicsThe Hebrew UniversityJerusalem 91904Israel Shanghai Astronomical Observatory Chinese Academy of SciencesShanghai 200030China Shanghai Key Lab for Astrophysics Shanghai Normal UniversityShanghai 200234China

We present a tentative constraint on cosmological parameters Ω_(m) and σ_(8) from a joint analysis of galaxy clustering and galaxygalaxy lensing from DESI Legacy Imaging Surveys Data Release 9(DR9),covering approximately 10000 square degrees and spanning the redshift range of 0.1 to *** study the dependence of cosmological parameters on lens redshift,we divide lens galaxies into seven approximately volume-limited samples,each with an equal width in photometric *** retrieve the intrinsic projected correlation function w_(p)(r_(p))from the lens samples,we employ a novel method to account for redshift ***,we measured the galaxy-galaxy lensing signal ΔΣ(r_(p))for each lens sample,using source galaxies selected from the shear catalog by applying our Fourier Quad pipeline to DR9 *** model these observables within the flatΛCDM framework,employing the minimal bias *** ensure the reliability of the minimal bias model,we apply conservative scale cuts:r_(p)>8 and 12 h^(-1)Mpc,for w_(p)(r_(p))and ΔΣ(r_(p)),*** findings suggest a mild tendency that S_(8)=σ_(8)√Ω_(m)/0.3increases with lens redshift,although this trend is only marginally *** we combine low redshift samples,the value of S8is determined to be 0.84±0.02,consistent with the Planck results but significantly higher than the 3×2 pt analysis by 2-5σ.Despite the fact that further refinements in measurements and modeling could improve the accuracy of our results,the consistency with standard values demonstrates the potential of our method for more precise and accurate cosmology in the future.

关键词： spatial distribution of galaxies statistical and correlative studies of properties observational cosmology

Toward a stellar population catalog in the Kilo Degree Survey:The impact of stellar recipes on stellar masses and star formation rates

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Science China(Physics,Mechanics & Astronomy) 2023年第12期66卷 203-229页

作者： Linghua Xie Nicola R.Napolitano Xiaotong Guo Crescenzo Tortora Haicheng Feng antonios katsianis Rui Li Sirui Wu Mario Radovich Leslie K.Hunt Yang Wang Lin Tang Baitian Tang Zhiqi Huang School of Physics and Astronomy Sun Yat-sen UniversityZhuhai 519082China CSST Science Center for the Guangdong-Hongkong-Macao Greater Bay Area Zhuhai 519082China Institute of Astronomy and Astrophysics Anqing Normal UniversityAnqing 246133China INAF—Osservatorio Astronomico di Capodimonte Napoli 80131Italy Yunnan Observatories Chinese Academy of SciencesKunming 650011China School of Astronomy and Space Science University of Chinese Academy of SciencesBeijing 100049China National Astronomical Observatories Chinese Academy of SciencesBeijing 100012China INAF—Osservatorio Astronomico di Padova Padova 35122Italy INAF—Osservatorio Astronomico di Arcetri Firenze 50125Italy Peng Cheng Laboratory Shenzhen 518000China School of Physics and Astronomy China West Normal UniversityNanchong 637002China

The Kilo Degree Survey(Ki DS)is currently the only sky survey providing optical(ugri)plus near-infrared(NIR,ZY H JKS)seeing matched photometry over an area larger than 1000 *** is obtained by incorporating the NIR data from the VISTA Kilo Degree Infrared Galaxy(VIKING)survey,covering the same Ki DS *** such,the Ki DS multi-wavelength photometry represents a unique dataset to test the ability of stellar population models to return robust photometric stellar mass(M_(*))and star-formation rate(SFR)*** we use a spectroscopic sample of galaxies for which we possess ugri ZY JHK_(s)“gaussianized”magnitudes from Ki DS data release *** fit the spectral energy distribution from the 9-band photometry using:(1)three different popular libraries of stellar population templates,(2)single burst,simple and delayed exponential star-formation history models,and(3)a wide range of priors on age and *** template fitting codes we use two popular softwares:Le Phare and *** investigate the variance of the stellar masses and the star-formation rates from the different combinations of templates,star formation recipes and codes to assess the stability of these estimates and define some“robust”median quantities to be included in the upcoming Ki DS data *** a science validation test,we derive the mass function,the star formation rate function,and the SFR-M_(*)relation for a low-redshift(z<0.5)sample of galaxies,that result in excellent agreement with previous literature *** final catalog,containing~290000 galaxies with redshift 0.01

关键词： galaxies stellar populations galaxy stellar masses star formation rates stellar mass function