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研究生: 李建和
論文名稱: 低質量原恆星源IRAS 16293-2422的分子清單
Molecular Inventory in the Low-mass Protostellar Source IRAS 16293-2422
指導教授: 管一政
學位類別: 碩士
Master
系所名稱: 地球科學系
Department of Earth Sciences
論文出版年: 2010
畢業學年度: 98
語文別: 中文
論文頁數: 87
中文關鍵詞: 天文化學有機分子低質量原恆星
論文種類: 學術論文
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  • 我們使用SMA次毫米波干涉陣列觀測低質量原恆星雙星系統IRAS 16293-2422。在次角秒解析度下(0.9〃× 0.5〃),可以解析出I16293A有三個明顯的連續積分強度位置,而I16293B仍是一個未解析的點源。多數含硫分子存在於天體I16293A,且光譜結構複雜,暗示含硫分子在天體I16293A附近有著複雜的氣體動力結構。在角秒解析度(3.3〃× 1.2〃)的觀測裡,包含基態與扭轉激發態的CH3OH分子,多數分子有明顯的藍移與紅移速度組成的光譜輪廓,從基態CH3OH分子所計算出的旋轉激發溫度為261 K(I16293A)和211 K(I16293B)。另一方面,C2H5OH分子與CH3CHO分子所得到的旋轉激發溫度分別為214 K(I16293A) 與313 K(I16293B),暗示在低質量恆星形成區也存在高溫的分子形成環境與種類豐富的有機分子,也間接證實了低質量熱分子雲核hot corinos的存在。我們在I16293A與I16293B上分別觀測到C2H5OH及CH3CHO分子有不同的空間分布,顯示出這兩個天體有不同的演化時期。其他複雜的有機分子,所得的旋轉激發溫度都大於150 K,甚至在I16293B上的34SO2分子有350 K,表示無論在I16293A或I16293B上都有高溫的分子形成區域。另外比較彼此之間的豐度比例,發現有許多分子的豐度並無法與化學模型有一致結果,暗示低質量恆星形成區裡分子形成過程可能與高質量熱分子雲核在化學途徑演化上有著顯著的差異。

    摘要 I 目次 II 圖目 IV 表格 VI 第一章 緒論 1 1.1 星際介質與分子雲 1 1.2 低質量原恆星的演化 2 1.3 低質量Class 0原生恆星源:IRAS 16293-2422 3 第二章 觀測與資料處理 7 2.1 SMA望遠鏡 7 2.2 347-GHz觀測 7 2.3 353-GHz觀測 8 第三章 結果 13 3.1 347-與353-GHz之連續發射光譜 13 3.2 複雜的有機分子 17 3.3 含硫分子 21 3.4 其它簡單的分子 22 第四章 醇類及乙醛分子的分析與討論 31 4.1 分子氣體旋轉激發溫度與柱密度的計算 31 4.2 353-GHz CH3OH的光譜 32 4.3 337/347-GHz的 CH3OH分子 38 4.3.1 影像與光譜 38 4.3.2 基態躍遷態的CH3OH分子(υt = 0) 38 4.3.3 激發躍遷態的CH3OH分子(υt = 1) 39 4.3.4 激發躍遷態的CH3OH分子(υt = 2) 40 4.3.5 CH3OH分子的旋轉激發溫度與柱密度 40 4.4 C2H5OH分子 47 4.4.1 C2H5OH分子的早期觀測 47 4.4.2 C2H5OH分子的積分影像與光譜 48 4.5 CH3CHO分子 49 4.5.1 CH3CHO分子過去的觀測 49 4.5.2 CH3CHO分子的積分影像與光譜 55 4.5.3 CH3CHO與C2H5OH分子的關係 56 第五章 其它分子的分析與討論 58 5.1 低質量恆星形成區的化學反應區域 58 5.2 其他分子 59 5.2.1 C2H5CN分子 59 5.2.2 HCOOH分子 61 5.2.3 CH3OCH3分子 62 5.2.4 CH3OCHO分子 63 5.2.5 SiO分子 65 5.2.6 未鑑定的光譜線 70 5.3 各分子間的豐度比較 70 5.4 化學模型的解釋 76 第六章 總結 78 參考文獻 81 附錄:分子光譜資料庫簡介 86

    André, P., Ward-Thompson, D. & Barsony, M., 1993, Submillimeter Continuum Observations of Rho Ophiuchi A - The Candidate Protostar VLA 1623 and Prestellar Clumps, ApJ, 406, 122

    Bates, D. R., & Spitzer, L. Jr., 1951, The Density of Molecules in Interstellar Space, ApJ, 113, 441

    Bisschop, S. E., Fuchs, G. W., van Dishoeck, E. F. & Linnartz, H., 2007, H-atom Bombardment of CO2, HCOOH, and CH3CHO Containing Ices, A&A, 474, 1061

    Bisschop, S. E., Jørgensen, J. K., Bourke, T. L., Bottinelli, S., & van Dishoeck, E. F., 2008, An Interferometric Study of the Low-Mass Protostar IRAS 16293-2422: Small Scale Organic Chemistry, A&A, 488, 959

    Blake, G. A., van Dishoeck, E. F., Jansen, D. J., Groesbeck, T. D., & Mundy, L. G., 1994, Molecular Abundances and Low-Mass Star Formation. 1: Si- and S-bearing Species Toward IRAS 16293-2422, ApJ, 428, 680

    Blundell, R., 2005, The Submillimeter Array Antennas and Receivers, Astro-ph, 8492

    Bottinelli, S., Ceccarelli, C., Neri, R., Williams, J. P., Caux, E., Cazaux, S., Lefloch, B., Maret, S., & Tielens, A. G. G. M., 2004, Near-Arcsecond Resolution Observations of the Hot Corino of the Solar-Type Protostar IRAS 16293-2422, ApJ, 617, L69

    Bottinelli, S., Ceccarelli, C., Williams, J. P. & Lefloch, B., 2007, Hot Corinos in NGC 1333-IRAS4B and IRAS2A, A&A, 463, 601

    Burton, M. G., Lawrence, J. S., Ashley, M. C. B., Bailey, J. A., Blake, C., Bedding, T. R., Bland-Hawthorn, J., Bond, I. A., Glazebrook, K., Hidas, M. G., Lewis, G., Longmore, S. N., Maddison, S. T., Mattila, S., Minier, V., Ryder, S. D., Sharp, R., Smith, C. H., Storey, J. W. V., Tinney, C. G., Tuthill, P., Walsh, A. J., Walsh, W., Whiting, M., Wong, T., Woods, D., & Yock, P. C. M., 2005, Science Programs for a 2-m Class Telescope at Dome C, Antarctica: PILOT, the Pathfinder for an International Large Optical Telescope, PASA, 22, 199

    Caselli, P.; Hasegawa, T. I.; Herbst, E., 1993, Chemical Differentiation between Star-Forming Regions - The Orion Hot Core and Compact Ridge, ApJ, 408, 458

    Cazaux, S., Tielens, A. G. G. M., Ceccarelli, C., Castets, A., Wakelam, V., Caux, E., Parise, B., & Teyssier, D., 2003, The Hot Core Around the Low-mass Protostar IRAS 16293-2422: Scoundrels Rule!, ApJ, 593, 51

    Chandler, C. J., Brogan, C. L., Shirley, Y. L., & Loinard, L., 2005, IRAS 16293-2422: Proper Motions, Jet Precession, the Hot Core, and the Unambiguous Detection of Infall, ApJ, 632, 371

    Charnley, S. B., Tielens, A. G. G. M., & Millar, T. J., 1992, On the Molecular Complexity of the Hot Cores in Orion A - Grain Surface Chemistry as 'The Last Refuge of the Scoundrel', ApJ, 399, L71

    Charnley, S. B., Kress, M. E., Tielens, A. G. G. M. & Millar, T. J., 1995, Interstellar Alcohols, ApJ, 448, 232

    Charnley, S. B., 2004, Acetaldehyde in Star-Forming Regions, AdSpR, 33, 23

    Cummins, S. E., Green, S., Thaddeus, P. & Linke, R. A., 1983, The Kinetic Temperature and Density of the Sagittarius B2 Molecular Cloud from Observations of Methyl Cyanide, ApJ, 266, 331

    Doty, S. D., Schöier, F. L., & van Dishoeck, E. F., 2004, Physical-Chemical Modeling of the Low-Mass Protostar IRAS 16293-2422, A&A, 418, 1021

    Garrod, R. T. & Herbst, E., 2006, Formation of Methyl Formate and Other Organic Species in the Warm-up Phase of Hot Molecular Cores, A&A, 457, 927

    Garrod, R. T., Weaver, S. L. W. & Herbst, E., 2008, Complex Chemistry in Star-forming Regions: An Expanded Gas-Grain Warm-up Chemical Model, ApJ, 682, 283

    Green, T., 2001, Protostars, Am. Sci., 89, 316

    Herbst, E., 1990, The Chemistry of Interstellar Space, AngCh, 29, 595

    Hirano, N., Mikami, H., Umemoto, T., Yamamoto, S., & Taniguchi, Y., 2001, SiO Emission in the Multilobe Outflow Associated with IRAS 16293-2422, ApJ, 547, 899

    Ho, P. T. P., Moran, J. M., & Lo, K. Y., 2004, The Submillimeter Array, ApJ, 616, 1

    Huang, H. C., Kuan, Y. J., Charnley, S. B., Hirano, N., Takakuwa, S., Bourke, T. L., 2005, Organic Molecules in the Hot Corinos and Circumstellar Disks of IRAS 16293-2422, AdSpR, 36, 146

    Huang, H. C., 2009, National Taiwan Normal University, doctor’s degree thesis

    Kuan, Y. J., Huang, H. C., Charnley, S. B., Hirano, N., Takakuwa, S., Wilner, D. J., Liu, S. Y., Ohashi, N., Bourke, T. L., Qi, C., & Zhang, Q., 2004, Organic Molecules in Low-Mass Protostellar Hot Cores: Submillimeter Imaging of IRAS 16293-2422, ApJ, 616, L27

    Lada, C. J., & Shu, F. H., 1990, The Formation of Sunlike Stars, Sci., 248, 564

    Liu, S. Y., Mehringer, D. M. & Snyder, L. E., 2001, Observations of Formic Acid in Hot Molecular Cores, ApJ, 552, 654

    Loinard, L., 2002, Large Proper Motions in the Young Low-Mass Protostellar System IRAS 16293-2422, RMxAA, 38, 61

    Loinard, L., Castets, A., Ceccarelli, C., Lefloch, B., Benayoun, J. -J., Caux, E., Vastel, C., Dartois, E., & Tielens, A. G. G. M., 2002, Doubly Deuterated Formaldehyde in Star-Forming Regions: An Observational Approach, P&SS, 552, L163

    Loinard, L., Chandler, C. J., Brogan, C. L., & Wilner, D. J., & Ho, P. T. P., 2007, New Radio Sources and the Composite Structure of Component B in the Very Young Protostellar System IRAS 16293-2422, ApJ, 670, 1353

    Looney, L. W., Mundy, L. G., & Welch, W. J., 2000, Unveiling the Circumstellar Envelope and Disk: A Subarcsecond Survey of Circumstellar Structures, ApJ, 529,477

    Mehringer, D. M., Snyder, L. E., Miao, Y., & Lovas F. J., 1997, Detection and Confirmation of Interstellar Acetic Acid, ApJ, 480, 71

    Mizuno, A., Fukui, Y., Iwata, T., Nozawa, S., & Takano, T., 1990, A Remarkable Multilobe Molecular Outflow - Rho Ophiuchi East, Associated with IRAS 16293-2422, ApJ, 356, 184

    Narayanan, G., Walker, C. K.; & Buckley, H. D., 1998, The 〝Blue-Bulge'' Infall Signature Toward IRAS 16293-2422, ApJ, 496, 292

    Nummelin, A., Bergman, P., Hjalmarson, Å., Friberg, P., Irvine, W. M., Millar, T. J., Ohishi, M. & Saito, S., 2000, A Three-Position Spectral Line Survey of Sagittarius B2 between 218 and 263 GHZ. II. Data Analysis, ApJS, 128, 213

    Prasad, S. S., & Huntress, W. T., Jr., 1980, A Model for Gas Phase Chemistry in Interstellar Clouds. II - Nonequilibrium Effects and Effects of Temperature and Activation Energies, ApJ, 239, 151

    Remijan, A. J., & Hollis, J. M., 2006, IRAS 16293-2422: Evidence for Infall onto a Counterrotating Protostellar Accretion Disk, ApJ, 640, 842

    Schöier, F. L., Jørgensen, J. K., van Dishoeck, E. F., & Blake, G. A., 2002, Does IRAS 16293-2422 have a Hot Core? Chemical Inventory and Abundance Changes in Its Protostellar Environment, A&A, 390, 1001

    Shiao, Y.-S. J., Looney, L. W., Remijan, A. J., Snyder, L. E. & Friedel, D. N., 2010, First Acetic Acid Survey with CARMA in Hot Molecular Cores, ApJ, 716, 286

    Stark, R., Sandell, G., Beck, S. C., Hogerheijde, M. R., van Dishoeck, E. F., van der Wal, P., van der Tak, Floris F. S., Schäfer, F., Melnick, G. J., Ashby, M. L. N., & de Lange, G., 2004, Probing the Early Stages of Low-Mass Star Formation in LDN 1689N: Dust and Water in IRAS 16293-2422A, B, and E, ApJ, 608, 341

    Sutton, E. C., Jaminet, P. A., Danchi, W. C. & Blake, G. A., 1991, Molecular Line Survey of Sagittarius B2(M) from 330 to 355 GHz and Comparison with Sagittarius B2(N), ApJ, 77, 255

    Sutton, E. C., Peng, R., Danchi, W. C., Jaminet, P. A., Sandell, G. & Russell, A. P. G., 1995, The Distribution of Molecules in the Core of OMC-1, ApJS, 97, 455

    Tielens, A. G. G. M. & Charnley, S. B., 1997, Circumstellar and Interstellar Synthesis of Organic Molecules, OLEB, 27, 23

    Turner, B. E., 1991, A Molecular Line Survey of Sagittarius B2 and Orion-KL from 70 to 115 GHz. II - Analysis of the Data, ApJ, 76, 617

    van Dishoeck, E. F., Blake, G. A., Jansen, D. J., & Groesbeck, T. D., 1995, Molecular Abundances and Low-Mass Star Formation. II. Organic and Deuterated Species Toward IRAS 16293-2422, ApJ, 447, 760

    Wakelam, V., Caselli, P., Ceccarelli, C., Herbst, E., & Castets, A., 2004, Resetting Chemical Clocks of Hot Cores Based on S-Bearing Molecules, A&A, 422, 159

    Walker, C. K., Lada, C. J., Young, E. T., Margulis, M., 1988, An Unusual Outflow Around IRAS 16293-2422, ApJ, 332, 335

    Wootten, A., 1989, The Duplicity of IRAS 16293-2422: A Protobinary Star ?, ApJ, 337, 858

    Zuckerman, B., Ball, J. A. & Gottlieb, C. A., 1971, Microwave Detection of Interstellar Formic Acid, ApJ, 163, 41

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