跳到主要內容

簡易檢索 / 詳目顯示

回結果列表
研究生： 黃美綾
Mei-Ling Huang
論文名稱： Merging Galaxies in the SWIRE Fields
Merging Galaxies in the SWIRE Fields
指導教授： 黃崇源
Chorng-Yuan Hwang
口試委員:
學位類別： 碩士
Master
系所名稱： 理學院 - 天文研究所
Graduate Institute of Astronomy
畢業學年度： 98
語文別： 英文
論文頁數： 52
中文關鍵詞： 合併星系
外文關鍵詞： merging galaxies
相關次數： 點閱：15  下載：0 
分享至:
查詢本校圖書館目錄 查詢臺灣博碩士論文知識加值系統 勘誤回報

    • 我們分析了400多個合併星系在紅外線與可見光波段的性質，以了解其恆星生成率的特色。我們的樣本來自超過一萬五千個合併星系的目錄。這個目錄裡的合併星系由加法夏天文台(CFHT)所觀測，經過程式的自動篩選和肉眼的人工判斷而被認定為合併星系；紅外波段的資料來自史匹哲太空望遠鏡的觀測。我們的分析結果顯示，在低紅移時，由兩個橢圓星系組成的合併星系的數量比先前的研究來得少。雖然大多數的合併星系都有被激發的恆星生成率，擁有極大恆星生成率的合併星系卻很少。另外，恆星生成率和合併星系的成員星系間的距離、星等差呈現負相關。最後我們發現，相較於場環境，氣體少的合併星系的比例在星系團裡比較高，而且氣體多的合併星系的恆星生成率在星系團裡比較低。

    We present the infrared and optical properties of more than 400 merging galaxies to explore their features of star formation efficiency. The ~400 merging systems are from a catalog of 15k morphologically identified merging galaxies observed with the Canada-France-Hawaii Telescope, and the IR data are from the Spitzer Wide-area InfraRed Extragalactic Survey (SWIRE). Our analyses show that the fraction of mergers of two early-type galaxies at low redshifts is much smaller than those found in previous studies. Although most merging systems do show enhanced star formation activity, merging systems with extremely high star formation rates (SFR) are rare. However, there is
    an anti-correlation between the specific SFR (SSFR) and the separation of the merging galaxies. In addition, the SSFR of merging galaxies also decreases when the magnitude difference between two member galaxies becomes large. Finally, we find a higher fraction of gas-poor mergers in galaxy clusters and the SSFR of gas-rich mergers is reduced in cluster environment.

    1 INTRODUCTION 1 2 DATA AND DATA REDUCTION 4 2.1 Sample of Merging Galaxies . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.2 Optical Data from SDSS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.3 IR Data from SWIRE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.3.1 IR Counterparts from SWIRE Catalogs . . . . . . . . . . . . . . . . 7 2.3.2 IR Counterparts from SWIRE Images . . . . . . . . . . . . . . . . . 8 3 SAMPLE CHARACTERISTICS 9 3.1 Photometric Redshifts of Close Pairs . . . . . . . . . . . . . . . . . . . . . 9 3.2 Estimating Total IR Luminosity and Stellar Mass . . . . . . . . . . . . . . 11 4 SSFR DISTRIBUTION OF GALAXY PAIRS 15 4.1 Bimodal Distribution of SSFR . . . . . . . . . . . . . . . . . . . . . . . . . 15 4.2 Spectral Types of Galaxies in Pairs . . . . . . . . . . . . . . . . . . . . . . 22 5 DEPENDENCE OF SSFR ON PHYSICAL PARAMETERS 30 5.1 Projected Separation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 5.2 Mass Ratio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 6 ENVIRONMENTAL EFFECTS ON SSFR 43 6.1 Environmental Distribution of Wet/Dry/Mixed Mergers . . . . . . . . . . . 43 6.2 Inhibition of Star Formation Activity in the Cluster . . . . . . . . . . . . . 45 7 Conclusion 47

    Abadi, M. G., Moore, B., & Bower, R. G. 1999, MNRAS, 308, 947
    Alonso M. S., et al. 2004, MNRAS, 352, 1081
    Baldry., I. K., et al. 2006, MNRAS, 373, 469
    Balogh., M. L., et al. 2004, ApJ, 615, L101
    Barnes, J., & Hernquist, L., et al. 1996, ApJ, 471, 115
    Barton, E. J., et al. 2000, ApJ, 530, 660
    Behcall, N. A., et al. 2003, ApJ, 148, 243
    Bekki, K., Couch, W. J., & Shioya, Y. 2002, ApJ, 577, 651
    Bell, E. F., et al. 2007, ApJ, 663, 834
    Binggeli, B., Sandage, A., & Tammann, G. A. 1988, ARA&A, 26, 509.
    Bower, R. G., Kodama, T., & Terlevich, A. 1998, MNRAS, 299, 1193
    Chary, R., & Elbaz, D. 2001, ApJ, 556, 562
    Davoodi, P., et al. 2006, MNRAS, 371, 1113
    Dale, D. A., et al. 2001, ApJ, 549, 215
    Dale, D. A., & Helou, G. 2002, ApJ, 576, 159
    de Ravel, L., et al. 2009, A&A, 498, 379
    Dominguez, M. J., et al. 2002, MNRAS, 335, 825
    Dressler, A. 1980, ApJ, 236, 351
    Elbaz, D., et al. 2002, A&A, 384, 848
    Faber, S. M., et al. 1997 AJ, 114, 1771
    Faber, S. M., et al. 2007 ApJ, 665, 265
    Fujita, Y., & Nagashima, M. 1999, ApJ, 516, 619
    Gladders, M. D., & Yee, H. K. C. 2000, AJ, 120, 2148
    Gomet, P., et al., 2003, ApJ, 584, 210
    Gunn, J. E., & Gott, J. R. I. 1972, ApJ, 176, 1
    Hancock, M., et al. 2007, AJ, 133, 676
    Hansen, S. M., et al. 2005, ApJ, 633, 122
    Hibbard, J. E., & van Gorkom, J. H. 1996, AJ, 111, 655
    Hopkins, P. F., et al. 2009, ApJS, 181, 486
    Hwang, C. Y., & Chang, M. Y. 2009, ApJS, 181, 233
    Kauffmann, G., et al. 2004, MNRAS, 353, 713
    Kennicutt, R. C., Jr. 1998, ApJ, 498, 541
    Khochfar, S., & Burkert, A. 2003, ApJ, 597, L117
    Koester, B. P., et al. 2007, ApJ, 660, 239
    Kron, R. G. 1980, ApJS, 43, 305
    Lagache, G., Dole, H., & Puget, J.-L. 2003, MNRAS, 338, 555
    Lambas, D. G., et al. 2003, MNRAS, 346, 1189
    Larson, R. B., Tinsley, B. M., & Caldwell, C. N. 1980, ApJ, 237, 692
    Lauer, T. R., et al. 2005, AJ, 129, 2138
    Lauer, T. R., et al. 2007, ApJ, 664, 226
    Le Floc’h, E., et al. 2005, ApJ, 632, 169
    Li, H.-N., Wu, H., Cao, C., & Zhu, Y.-N. 2007, AJ, 134, 1315
    Li, C., et al. 2008, MNRAS, 385, 1903
    Lin, L., et al. 2007, ApJ, 660, L51
    Lin, L., et al. 2008, ApJ, 681, 232
    Lonsdale, C. J., et al. 2003, PASP, 115, 897
    Lonsdale, C. J., et al. 2004, ApJS, 154, 54
    Martinez, H. J., et al. 2002, MNRAS, 333, 31
    Mihos, J. C., & Hernquist, L. 1996, ApJ, 464, 641
    Nikolic, B., Cullen, H., & Alexander, P. 2004, MNRAS, 355, 874
    Nulsen, P. E. J. 1982, MNRAS, 198, 1007
    Papovich, C., & Bell, E. F. 2002, ApJ, 579, L1
    Peebles, P. J. E. 2002, in ASP Conf. Ser. 283, A New Era in Cosmology, ed. N. Metcalfe & T. Shanks (San Francisco: ASP), 351
    Perez, M. J., et al. 2009, MNRAS, 399, 1157
    Polletta, M., et al. 2007, ApJ, 663, 81
    Rowan-Robinson, M., et al. 2008, MNRAS, 386, 697
    Schweizer, F. 1982, ApJ, 252, 455
    Strateva, I., et al. 2001, AJ, 122, 1861
    Takeuchi, T. T., et al. 2005, A&A, 432, 423
    Tissera, P. B., et al. 2002, MNRAS, 333, 327
    Toomre, A. & Toomre, J. 1972, ApJ, 178, 623
    Tran, K.-V. H., et al. 2005, ApJ, 627, L25
    van Dokkum, P. G., et al. 1999, ApJ, 520, L95
    Woods, D. F., et al. 2006, AJ, 132, 197
    Woods, D. F. & Geller, M. J. 2007, AJ, 134, 527
    Wu, H., et al. 2005, ApJ, 632, L79
    York, D. G., et al. 2000, AJ, 120, 1579

    QR CODE
    :::