نتایج جستجو برای: astronomical observatory
تعداد نتایج: 21523 فیلتر نتایج به سال:
T. Kotani∗a, K. Kubotab, M. Namikic, N. Kawaia, Y. Uedab, S. Trushkind, S. Fabrikad, V. Afanasievd, P. Abolmasovd, K. Kinugasae, T. Nagatab, T. Irsmambetova f , T. Tsukagoshig, K. Nakanishih, M. Tsuboih, S. Ozakibi, K. Yanagisawa j, S. Nishiyamak, T. Shimokawabea, Y. Yatsua, T. Ishimuraa, and K. Fujisawal a Tokyo Tech, 2-12-1 O-okayama, Meguro, Tokyo 152-8551, Japan b Kyoto University, Kitashir...
Which place is an appropriate site for the construction of the Iranian National Observatory (INO)? In this paper part of the site selection process is reported. The emphasis is on the measuring of the seeing parameter for the pre-selected regions. These regions are examined by meteorological and geophysical studies and finally Kashan, Kerman, Qom and Ferdows sites were selected among 31 regio...
We report observations of water masers around the semiregular variable RT Virginis (RT Vir), which have been made with the Very Long Baseline Array (VLBA) of the National Radio Astronomy Observatory (NRAO) at five epochs, each separated by three weeks of time. We detected about 60 maser features at each epoch. Overall, 61 features, detected at least twice, were tracked by their radial velocitie...
We performed Hα imaging observations of 22 luminous infrared galaxies to investigate how the distribution of star-forming regions in these galaxies is related to galaxy interactions. Based on correlation diagrams between Hα flux and continuum emission for individual galaxies, a sequence for the distribution of star-forming regions was found: very compact (∼ 100 pc) nuclear starbursts with almos...
The South African Astronomical Observatory (SAAO), formerly Royal Cape of Good Hope, celebrated 200 years existence as an astronomical observatory on Oct 20, 2020 and is the oldest scientific institution in Africa. Hope was founded 1820, for much its history, it major contributor to positional astronomy southern hemisphere. SAAO not only known rich history various contributions science, buildin...
Inger Jørgensen †‡§ Marijn Franx , Jens Hjorth , Pieter G. van Dokkum § McDonald Observatory, The University of Texas at Austin, RLM 15.308, Austin, TX 78712, USA Gemini Observatory, 670 N. A‘ohoku Pl., Hilo, HI 96720, USA (Postal address for IJ) Kapteyn Institute, P.O.Box 800, 9700 AV Groningen, The Netherlands Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA Leiden Observat...
Radio astronomical pulsar observations require specific instrumentation and dedicated signal processing to cope with the dispersion caused by the interstellar medium. Moreover, the quality of observations can be limited by radio frequency interferences (RFI) generated by Telecommunications activity. This paper will present the innovative pulsar instrumentation based on Graphical Processing Unit...
We present the first 1.3 mm (230 GHz) very long baseline interferometry model image of an AGN jet using closure phase techniques with a four-element array. The model image of the quasar 1924-292 was obtained with four telescopes at three observatories: the James Clerk Maxwell Telescope (JCMT) on Mauna Kea in Hawaii, the Arizona Radio Observatory’s Submillimeter Telescope (SMT) in Arizona, and 1...
Kiyotomo Ichiki and Kouji Nakamura Department of Astronomy, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan Division of Theoretical Astrophysics, National Astronomical Observatory, 2-21-1, Osawa, Mitaka, Tokyo 181-8588, Japan Department of Astronomical Science, the Graduate University for Advanced Studies, 2-21-1, Osawa, Mitaka, Tokyo 181-8588, Japan and Department of Physics...
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