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Institute for Astronomy University of Hawai'i at M¯Anoa Publications In Institute for Astronomy University of Hawai‘i at Manoa¯ Publications in Calendar Year 2008 Abe, M., Kawakami, K., Hasegawa, S., Kuroda, D., (2008) Yoshikawa, M., Kasuga, T., et al. Ground-Based Obser- Aschwanden, M. J., including Lugaz, N., Roussev, I. I. The- vational Campaign for Asteroid 1621731999JU3. In Lu- oretical Modeling for the Stereo Mission. Space Sci. Rev., nar and Planetary Science XXXIX,1594 (2008) 136, 565–604 (2008) Abe, M., et al., including Kasuga, T., Bus, S. J., Tokunaga, Aspin, C., Beck, T. L., & Reipurth, B. V1647 Orionis: One A. Ground-Based Observational Campaign for 162173 Year Into Quiescence. AJ, 135, 423–440 (2008) 1999JU3, the Target Asteroid of Sample Return Mission, Atrio-Barandela, F., Kashlinsky, A., Kocevski, D., & Ebel- Hayabusa-2. LPI Contributions, 1405, 8069 (2008) ing, H. Measurement of the Electron-Pressure Profile Adami, C., Ilbert, O., Pell´e, R., Cuillandre, J. C., Durret, of Galaxy Clusters in 3 Year Wilkinson Microwave F., Mazure, A., Picat, J. P., & Ulmer, M. P. Photometric Anisotropy Probe (WMAP) Data. ApJ, 675, L57–L60 Redshifts as a Tool for Studying the Coma Cluster Galaxy (2008) Populations. A&A, 491, 681–692 (2008) Avila, R., Avil´es, J. L., Wilson, R. W., Chun, M., Butterley, Adelman-McCarthy, J. K., including Pope, A. C., Szapudi, I. T., & Carrasco, E. LOLAS: An Optical Turbulence Pro- The Sixth Data Release of the Sloan Digital Sky Survey. filer in the Atmospheric Boundary Layer with Extreme ApJS, 175, 297–313 (2008) Altitude Resolution. MNRAS, 387, 1511–1516 (2008) A’Hearn, M. F., et al., including Meech, K. J. Deep Impact Bally, J., Walawender, J., Johnstone, D., Kirk, H., & Good- and Sample Return. Earth, Planets, and Space, 60, 61–66 man, A. The Perseus Cloud. In ASP Monograph4: Hand- (2008) book of Star Forming Regions, Vol. 1: The Northern Sky, Allen, M. G., Groves, B. A., Dopita, M. A., Sutherland, R. 308–345 (2008) S., & Kewley, L. J. The MAPPINGS III Library of Fast Barger, A. J. AGN and the Faint Radio Population. In ASP Radiative Shock Models. ApJS, 178, 20–55 (2008) Conf. Ser. 395: Frontiers of Astrophysics: A Celebration Allen, S. W., Rapetti, D. A., Schmidt, R. W., Ebeling, H., of NRAO’s 50th Anniversary, 157–167 (2008) Morris, R. G., & Fabian, A. C. Improved Constraints on Barger, A. J., Cowie, L. L., & Wang, W.-H. A Highly Com- Dark Energy from Chandra X-ray Observations of the plete Spectroscopic Survey of the GOODS-N Field. ApJ, Largest Relaxed Galaxy Clusters. MNRAS, 383, 879– 689, 687–708 (2008) 896 (2008) Barucci, M. A., et al., including Owen, T. Surface Compo- Allen, T. S., et al., including Williams, J. P. Spitzer, Near- sition and Temperature of the TNO Orcus. A&A, 479, Infrared, and Submillimeter Imaging of the Relatively L13–L16 (2008) Sparse Young Cluster, Lynds 988e. ApJ, 675, 491–506 Bauer, J. M., including Meech, K. J. Photometry of Small (2008) Outer Solar System Bodies with the NEAT Database. LPI Andrews, S. M., Liu, M. C., Williams, J. P., & Allers, K. N. Contributions, 1405, 8086 (2008) Submillimeter Observations of the Young Low-Mass Ob- Bavouzet, N., Dole, H., Le Floc’h, E., Caputi, K. I., Lagache, ject IRAS 04158+2805. ApJ, 685, 1039–1045 (2008) G., & Kochanek, C. S. Estimating the Total Infrared Lu- Andrews, S. M., & Williams, J. P. A Submillimeter View of minosity of Galaxies Up to z ∼ 2 from Mid- and Far- Protoplanetary Dust Disks. Ap&SS, 313, 119–122 (2008) Infrared Observations. A&A, 479, 83–96 (2008) Apai, D., Luhman, K., & Liu, M. C. Disks around Brown Becker, A. C., et al., including Tonry, J. L. Exploring the Dwarfsand Cool Stars. In ASP Conf. Ser. 384: 14th Cam- Outer Solar System with the ESSENCE Supernova Sur- bridge Workshop on Cool Stars, Stellar Systems, and the vey. ApJ, 682, L53–L56 (2008) Sun, 383–391 (2008) Bennert, N., Canalizo, G., Jungwiert, B., Stockton, A., Archinal, B. A., et al., including Tholen, D. J. Division I-III/ Schweizer, F., Peng, C., & Lacy, M. Fueling QSOs: The Working Group Cartographic Coordinates and Rotational Relevance of Mergers. Mem. Soc. Astron. Italiana, 79, Elements. In Trans. IAU, Ser. A, 27, 68 (2008) 1247–1250 (2008) Artigau, E., Biller, B. A., Wahhaj, Z., et al., including Chun, Bennert, N., Canalizo, G., Jungwiert, B., Stockton, A., M. R., Liu, M. C., Ftaclas, C. NICI: Combining Coron- Schweizer, F., Peng, C., & Lacy, M. Searching for Merg- agraphy,ADI, and SDI. Proc. SPIE, 7014, 70141Z (9 pp.) ers in Early-Type QSO Host Galaxies and a Control Sam- 1 ple of Inactive Ellipticals. In IAU Symp. 245: Formation Bowell, E. L. G., Meech, K. J., et al. Division III: Planetary and Evolution of Galaxy Bulges, 235–236 (2008) Systems Sciences. In Trans. IAU, Ser. A, 27, 149–153 Bennert, N., Canalizo, G., Jungwiert, B., Stockton, A., (2008) Schweizer, F., Peng, C. Y., & Lacy, M. Evidence for Bradac, M., Allen, S. W., Treu, T., Ebeling, H., Massey, Merger Remnants in Early-Type Host Galaxies of Low- R., Morris, R. G., von der Linden, A., & Applegate, D. Redshift QSOs. ApJ, 677, 846–857 (2008) Revealing the Properties of Dark Matter in the Merging Bennett, C.J., Jamieson, C. S., & Kaiser, R. I. Mechanis- Cluster MACS J0025.4-1222. ApJ, 687, 959–967 (2008) tic Studies on the Decomposition of Carbon Suboxide in Brand, K., Weedman, D. W., Desai, V., Le Floc’h, E., et a Cometary Ice Analog. Planet. Space Sci., 56, 1181– al. Spitzer Mid-Infrared Spectroscopy of Distant X-Ray 1189(2008) Luminous Active Galactic Nuclei. ApJ, 680, 119–129 Bernardi, F., Tholen, D. J., & Micheli, M. (25143) Itokawa (2008) Absolute Magnitude and Slope Parameter G Calibration. Brand, K., Weedman, D. W., Desai, V., Le Floc’h, E., et LPI Contributions, 1405, 8338 (2008) al. Spitzer Mid-Infrared Spectroscopy of 70 µm-selected Biller, B., Artigau, E., Wahhaj, Z., Hartung, M., Liu, M. C., Distant Luminous Infrared Galaxies. ApJ, 673, 119–127 Close, L. M., Chun, M. R., Ftaclas, C., et al. Observ- (2008) ing Strategies for the NICI Campaign to Directly Image Bresolin, F. Massive Stars in the Nuclei and Arms of Spirals. Extrasolar Planets. Proc. SPIE, 7015, 70156Q (12 pp.) In IAU Symp. 250: Massive Stars as Cosmic Engines, (2008) 273–284 (2008) Binzel, R. P., Thomas, C. A., Tokunaga, A., Bus, S. J., et al. Bresolin, F. Measuring Chemical Abundances in Extragalac- Spectral Properties of Near-Earth Object Mission Targets. tic Metal-Rich H II Regions. In The Metal-Rich Universe, LPI Contributions, 1405, 8228 (2008) 155–167 (2008) Birlan, M., Nedelcu, D. A., Lainey, V., Arlot, J.-E., Binzel, Bresolin, F., Crowther, P. A., & Puls, J., eds. IAU Symp. 250: R. P., Bus, S. J., Rayner, J., et al. Photometric and As- Massive Stars as Cosmic Engines. 590 pp. (2008) trometric Analysis of a Mutual Event between the Ura- Brodwin, M., et al., including Le Floc’h, E. Clustering of nian Satellites Miranda and Oberon. Astron. Nachr., 329, Dust-Obscured Galaxies at z ∼ 2. ApJ, 687, L65–L68 567–572 (2008) (2008) Blondin, S., et al., including Tonry, J. L. Time Dilation in Brown, W. R., Kewley, L. J., & Geller, M. J. MMT Ex- Type Ia Supernova Spectra at High Redshift. ApJ, 682, tremely Metal-Poor Galaxy Survey. I. An Efficient Tech- 724–736 (2008) nique to Identify Metal-Poor Galaxies. AJ, 135, 92–98 Boesgaard, A. M., Levesque, E. M., & Rich, J. A. Beryl- (2008) lium in the Oldest Stars. In AIP Conf. Proc. 990: First Buat, V., et al, including Le Floc’h, E. Star Formation His- Stars III, 164–166 (2008) tory of Galaxies from z =0 to z =0.7. A Backward Ap- Bolton, A. S., Burles, S., Koopmans, L. V. E., Treu, T., proach to the Evolution of Star-Forming Galaxies. A&A, Gavazzi, R., Moustakas, L. A., Wayth, R., & Schlegel, D. 483, 107–119 (2008) J. The Sloan Lens ACS Survey. V. The Full ACS Strong- Burgasser, A. J., Liu, M. C., Ireland, M. J., Cruz, K. L., & Lens Sample. ApJ, 682, 964–984 (2008) Dupuy, T. J. Subtle Signatures of Multiplicity in Late- Bolton, A. S., Treu, T., Koopmans, L. V. E., Gavazzi, R., type Dwarf Spectra: The Unresolved M8.5 + T5 Binary Moustakas, L. A., Burles, S., Schlegel, D. J., & Wayth, 2MASS J03202839-0446358. ApJ, 681, 579–593 (2008) R. The Sloan Lens ACS Survey. VII. Elliptical Galaxy Burgasser, A. J., Looper, D. L., Kirkpatrick, J. D., Cruz, K. Scaling Laws from Direct Observational Mass Measure- L., & Swift, B. J. Clouds, Gravity, and Metallicity in Blue ments. ApJ, 684, 248–259 (2008) L Dwarfs: The Case of 2MASS J11263991-5003550. Boss, A. P., Irvine, W. M., Meech, K. J., Cosmovici, C. B., ApJ, 674, 451–465 (2008) Ehrenfreund,P. F., Latham, D. W., Morrison, D., & Udry, Burgasser, A. J., Tinney, C. G., Cushing, M. C., Saumon, S. Commission 51: Bioastronomy. In Trans. IAU, Ser. A, D., Marley, M. S., Bennett, C. S., & Kirkpatrick, J. D. 27, 179–180 (2008) 2MASS J09393548-2448279: The Coldest and Least Lu- Bottinelli, S., Ceccarelli, C., Neri, R., & Williams, J. P. High- minous Brown Dwarf Binary Known? ApJ, 689, L53– Resolution Observations of CH3CN in the Hot Corino of L56 (2008) NGC1333-IRAS4A. In IAU Symp. 251: Organic Matter Bus, S. J. Identification of Spectro-Dynamical Asteroid Fam- in Space, 117–118 (2008) ilies. LPI Contributions, 1405, 8320 (2008) Bou´e, G., Durret, F., Adami, C., Mamon, G., Ilbert, O., & Capak, P., et al., including Ilbert, O., Kartaltepe, J., Cayatte, V.An Optical View of the 4 Mpc X-ray Filament Sanders, D.
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