星系團A2319的多色測光研究
發(fā)布時間：2019-02-26 21:40
【摘要】：作為宇宙中最大的引力束縛系統(tǒng),星系團通常位于宇宙纖維狀結(jié)構(gòu)的節(jié)點上,是宇宙大尺度結(jié)構(gòu)的示蹤物,也是研究星系之間相互作用和各種演化過程的環(huán)境效應(yīng)的重要實驗室。 本文主要利用BATC(Beijing-Arizona-Taiwan-Connecticut)的多色測光數(shù)據(jù),對星系團A2319(zc=0.0557)進行了初步的測光研究。BATC多色測光系統(tǒng)利用國家天文臺興隆觀測基地的60/90厘米施密特望遠鏡,配備了15個中帶(a-k,m-P)濾光片,波長覆蓋范圍從3000A到10000A。在58’×58’視場中,NASA/IPAC Extragalactic Database (NED)已經(jīng)收錄了140個已知光譜紅移的星系數(shù)據(jù),其中137個星系是A2319的成員星系(樣本Ⅰ)。樣本Ⅰ的空間投影分布與局域速度分布均支持A2319是個動力學(xué)活躍的星系團,這也與X射線的觀測相吻合。K-test表明在A2319中心區(qū)域存在2個子結(jié)構(gòu),而且空間投影分布有東北-西南方向的拉伸。根據(jù)位力定理,估算了A2319主團和子團的質(zhì)量,二者在投影角α處于22°到82°范圍內(nèi)是引力束縛的。 利用BATC多色測光數(shù)據(jù),我們通過雙色圖和測光紅移估計來挑選A2319中暗成員星系的候選體。A2319處于低銀緯(～13°)天區(qū),視寧度較差的BATC圖像具有嚴重的前景星場污染。為了排除暗成員星系候選體中由于前景星場污染造成的偽源,我們利用美國Steward大學(xué)的Bok2.3m望遠鏡的視寧度良好的U波段圖像,最終挑選出233個暗成員星系。與樣本Ⅰ合并得到了一個包括370個成員星系的大樣本(樣本Ⅱ)�；跇颖劲�,A2319成員星系的空間分布表現(xiàn)出更明顯的動力學(xué)子結(jié)構(gòu)。局域速度分布的統(tǒng)計檢驗顯示,星系團A2319西北(NW)方向10’處存在顯著的子結(jié)構(gòu),與前人的研究結(jié)果相符。同時,在團中心西北方向大約22’處還發(fā)現(xiàn)一個子團。 此外,基于Sloan光譜巡天數(shù)據(jù)提供的242個成員星系的光譜,利用星族合成軟件STARLIGHT獲得了這些成員星系的星族成份和恒星形成歷史,研究了這些星系的恒星形成性質(zhì)(如特征星族年齡、金屬豐度、恒星質(zhì)量和恒星形成率等)隨星系面密度的變化規(guī)律。研究結(jié)果表明：處于環(huán)境密度較高的團中心區(qū)域的星系具有較高的星族年齡和金屬豐度,其比恒星形成率較低,而在最近24.5Myr內(nèi)的恒星形成活動受到抑制。最后,我們還確認了星系金屬豐度、比恒星形成率與恒星質(zhì)量的相關(guān)性。該部分研究是一年前通過團隊合作完成,論文已經(jīng)被《天文學(xué)報》接收,即將發(fā)表。
[Abstract]:As the largest gravitational binding system in the universe, the cluster of galaxies is usually located at the node of the cosmic fibrous structure and is a tracer of the large-scale structure of the universe. It is also an important laboratory for the study of intergalactic interactions and the environmental effects of various evolutionary processes. In this paper, we mainly use the multicolor photometric data of BATC (Beijing-Arizona-Taiwan-Connecticut), A preliminary photometric study of cluster A2319 (zc=0.0557) has been carried out. The BATC multicolor photometric system uses the 60-90 cm Schmidt telescope at the National Observatory's Xinglong observation Base and is equipped with 15 medium-band (aqk, mp) filters. The BATC multicolor photometric system uses the 60-90 cm Schmidt telescope at the National Observatory's Xinglong Observatory. Wavelength coverage from 3000A to 10000A In the 58'脳 58 'field of view, NASA/IPAC Extragalactic Database (NED) has recorded 140 known spectral redshifts of galaxies, of which 137 are member galaxies of A2319 (sample I). Both the spatial projection distribution and the local velocity distribution of sample 鈪，
本文編號：2431170
[Abstract]:As the largest gravitational binding system in the universe, the cluster of galaxies is usually located at the node of the cosmic fibrous structure and is a tracer of the large-scale structure of the universe. It is also an important laboratory for the study of intergalactic interactions and the environmental effects of various evolutionary processes. In this paper, we mainly use the multicolor photometric data of BATC (Beijing-Arizona-Taiwan-Connecticut), A preliminary photometric study of cluster A2319 (zc=0.0557) has been carried out. The BATC multicolor photometric system uses the 60-90 cm Schmidt telescope at the National Observatory's Xinglong observation Base and is equipped with 15 medium-band (aqk, mp) filters. The BATC multicolor photometric system uses the 60-90 cm Schmidt telescope at the National Observatory's Xinglong Observatory. Wavelength coverage from 3000A to 10000A In the 58'脳 58 'field of view, NASA/IPAC Extragalactic Database (NED) has recorded 140 known spectral redshifts of galaxies, of which 137 are member galaxies of A2319 (sample I). Both the spatial projection distribution and the local velocity distribution of sample 鈪，
本文編號：2431170
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