2007-08-012024-05-13https://scholars.lib.ntu.edu.tw/handle/123456789/653762摘要：我們在2006 下半年「交互作用星系」計畫補助開始後，在數據取得和初步 分析上已經獲得重要進展。計畫樣本中的26 組Ks 波段選擇的本地低紅移「交 互作用星系對」（Interacting Galaxy Paris），已經由Spitzer 紅外太空望遠鏡在近 紅外（IRAC）和遠紅外（MIPS）波段全部觀測完畢，使用Palomar 5m 望遠鏡 所進行的Hα及Hβ地面光學觀測也已經完成。這個研究計畫的主要目的是經 由這些星系中「恆星形成率」的觀察分析，研究星系的形成與演化。Spitzer 的 數據初步分析顯示，星系中恆星形成的性質十分多樣，同時這些近紅外波段下 的強烈交互作用星系卻顯示了溫和的恆星形成，這與遠紅外的觀測極為不同。 本地（z ~ 0）的交互作用星系已經顯示令人驚訝的多樣性，本地和高紅移星系 的比較將更令人期待。我們因此希望申請一項為期三年的研究計畫，以深入分 析瞭解這些珍貴的太空及地面數據，並進一步獲取高紅移星系相對應的太空及 地面觀測數據，以找出彼此之間的物理關係。這三年中的工作將包括修正星際 間消光對觀測的影響，尤其在Hα及Hβ的可見光段觀測， 並配合「恆星合 成模型」的擬合，以估計星系的年齡以及推導星系中恆星形成的歷史，藉此比 較恆星形成率與星系類型、質量、年齡以及星系核心及盤面等不同區域的變化， 在高紅移部分，我們將以同樣的選擇條件，在z ~ 0.7 及z ~ 1.1 處（配合Spitzer 在IRAC 和MIPS 所對應的紅位移），定義出另外兩組「星系對」樣本，比較這 兩組高紅移與低紅移的星系對，進而了解宇宙早期（55% 及67% Look-back Time）星系的演化過程，和今天（0% Look-back Time）星系的演化過程有何不 同。 <br> Abstract: In the 2nd half of 2006 after we received the funding from NSC on the program “Interacting Galaxies”, tremendous progresses have been made on the data acquisition and preliminary analysis. The 26 Ks-selected interacting pairs have all been observed using Spitzer in the near-IR (IRAC) and in the far-IR (MIPS). In addition, the ground-based Palomar 5m telescope observations of Hα and Hβ imaging have also been completed. The major purpose of this project is to understand the formation and evolution of galaxies through the study of the “star formation rate”in these interacting pairs. The preliminary analysis of Spitzer images shows that the star formation properties in these local galaxies are quite diversified. In addition, the near-IR images reveal moderate star formation which is quite different from the conclusion reached with the far-IR data. The preliminary work on this local sample has already yielded amazing results. We thus apply for a 3-year program to analyze in depth these precious space- and ground-based data, and to formulate the evolutionary scenario between local and higher redshift galaxies. The work in the coming 3 years will include the corrections of extinctions in ground-based data, the estimate of age and star formation history using “star formation models”, and the derivation of the relations between star formation rate and galaxy type, mass, age, and morphology. At the higher redshift end, we will apply the same criteria to select two “interacting pair counterparts”at z ~ 0.7 and z ~ 1.1, matching the redshifts defined by IRAC and MIPS, and to compare the sample galaxies to the local ones, in order to understand the difference in galaxy evolution in the early universe（55% 及67% Look-back Time）and in the local universe（0% Look-back Time）.星系演化交互作用星系恆星形成率galaxy evolutioninteracting galaxiesstar formation rate