本文關鍵詞：EGS場中高紅移極亮紅外星系的形態(tài)與結構　出處：《天文學報》2014年06期 　論文類型：期刊論文

  更多相關文章： 星系 演化 星系 基本參數(shù) 星系 結構 星系 高紅移

【摘要】：通過利用CANDELS-EGS(Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey-Extended Groth Strip)場中HST WFC3(Hubble Space Telescope Wide Field Camera 3)F160W高分辨率的觀測圖像,研究了9個光譜紅極亮紅外星系的形態(tài)結構特征.發(fā)現(xiàn)這些星系的形態(tài)表現(xiàn)出多樣性(從橢圓到多個亮核或彌散的結構),如:雙核,氣體橋,雙不對稱體,不規(guī)則或橢圓結構.為了定量地研究這些極亮紅外星系的形態(tài),測量了它們在靜止光學波段的形態(tài)參數(shù)(基尼系數(shù)G和矩指數(shù)M20).與近鄰極亮紅外星系相比,高紅移極亮紅外星系的G偏小而M20偏大,表明這些星系的星族分布聚集度小且不對稱性大.基于對樣本中極亮紅外星系2維面亮度輪廓的擬合,得到這些星系的有效半徑分布在2.4 kpc到5.8 kpc之間,其平均值是(3.9±1.1)kpc.相比較于近鄰相似質量的恒星形成星系來說,高紅移極亮紅外星系的平均大小要小1到2倍.在類似紅移和紅外光度條件下,得出的這些結果也與其它文獻中給出的結論相一致.
[Abstract]:By using CANDELS-EGS (Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey-Extended Groth Strip WFC3 (Hubble) in HST Space Telescope Wide Field Camera 3) F160W images with high resolution, the configuration of 9 spectral red ultraluminous infrared galaxies. These galaxies that form show diversity (from elliptic to a bright nucleus or dispersion), such as: dual structure, gas bridge, double asymmetric, irregular or ellipse structure. In order to quantitatively study the ulirg form, they still in the optical band shape parameters were measured (Gini coefficient and moment G index M20). Compared with the nearest neighbor ultraluminous infrared galaxies with high redshift ultraluminous infrared Galaxy G is small and M20 is large, indicating that these galaxies population distribution and aggregation degree of asymmetry. In the sample ulirg based on 2 dimensional surface brightness The profile fitting, effective radius distribution of these galaxies in the 2.4 KPC to 5.8 KPC, the average value is (3.9 + 1.1) kpc. compared with the nearest neighbor similar quality star forming galaxies, the average size of high redshift ultraluminous infrared galaxies to 1 to 2 times. In a similar red and infrared photometric conditions and these results are also consistent with other literature given in the conclusion.
【作者單位】： 大理學院天文與科技史研究所;中國科學院星系與宇宙學重點實驗室;中國科學技術大學天體物理中心;
【基金】：國家自然科學基金項目(11303002,11225315,11320101002) 云南省應用基礎研究計劃項目(2014FB155) 中國科學院戰(zhàn)略性先導科技專項(XDB09000000)資助
【分類號】：P152
【正文快照】： 1引言極亮紅外星系(ULtraluminous Infra Red Galaxies,ULIRGs)的紅外(IR,8～1000μm)光度分布在1013 L⊙LIR1012L⊙范圍內(nèi),它們首次被IRAS[1](In-fra Red Astronomical Satellite)紅外巡天探測到.在過去的數(shù)十年研究工作中,觀測已經(jīng)證明了高紅移極亮紅外星系是大質量(M*10

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1 ;Classification of extremely red objects in the Hubble Ultra Deep Field[J];Research in Astronomy and Astrophysics;2009年01期

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