Published Papers - TOMITA Akihiko

Astronomy for Development; Approaches in Asia

Kumiko Usuda-Sato, Akihiko Tomita

Publications of the Korean Astronomical Society (Proceedings of APRIM 2014, 12th Asia-Pacific Regional IAU Meeting, August 18 - 22, 2014, DCC, Daejeon, Korea, edited by Young Chol Minh and Hoil Kim)   30 ( 2 ) 731 - 733   2015.09

学童保育での「星企画」：その活動内容

富田晃彦

和歌山大学教育学部附属教育実践総合センター 紀要   ( 25 ) 33 - 41   2015.09

A co-operation with Serbia on Space and Astronomy Education: A report of activities in 2013

Akihiko Tomita, Dušan Radosavljević, Hiroaki Akiyama, Masachika A. Kijima, Masami Okyudo, Chiaki Yoshizumi, Naoko Sato, Tomomi Otani （Part： Lead author )

Bulletin of Institute for Education on Space ( 和歌山大学宇宙教育研究所 )  ( 3 ) 79 - 84   2014.03  [Refereed]

DOI

Kiso Supernova Survey (KISS): Survey strategy

Tomoki Morokuma, Nozomu Tominaga, Masaomi Tanaka, Kensho Mori, Emiko Matsumoto, Yuki Kikuchi, Takumi Shibata, Shigeyuki Sako, Tsutomu Aoki, Mamoru Doi, Naoto Kobayashi, Hiroyuki Maehara, Noriyuki Matsunaga, Hiroyuki Mito, Takashi Miyata, Yoshikazu Nakada, Takao Soyano, Ken'ichi Tarusawa, Satoshi Miyazaki, Fumiaki Nakata, Norio Okada, Yuki Sarugaku, Michael W. Richmond, Hiroshi Akitaya, Greg Aldering, Ko Arimatsu, Carlos Contreras, Takashi Horiuchi, Eric Y. Hsiao, Ryosuke Itoh, Ikuru Iwata, Koji S. Kawabata, Nobuyuki Kawai, Yutaro Kitagawa, Mitsuru Kokubo, Daisuke Kuroda, Paolo Mazzali, Toru Misawa, Yuki Moritani, Nidia Morrell, Rina Okamoto, Nikolay Pavlyuk, Mark M. Phillips, Elena Pian, Devendra Sahu, Yoshihiko Saito, Kei Sano, Maximilian D. Stritzinger, Yutaro Tachibana, Francesco Taddia, Katsutoshi Takaki, Ken Tateuchi, Akihiko Tomita, Dmitry Tsvetkov, Takahiro Ui, Nobuharu Ukita, Yuji Urata, Emma S. Walker, Taketoshi Yoshii

Publications of the Astronomical Society of Japan ( OXFORD UNIV PRESS )  66 ( 6 )   2014  [Refereed]

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Article number: 114

DOI

Density waves and star formation in grand-design spirals

Bernabe Cedres, Jordi Cepa, Angel Bongiovanni, Hector Castaneda, Miguel Sanchez-Portal, Akihiko Tomita

ASTRONOMY & ASTROPHYSICS ( EDP SCIENCES S A )  560   2013.12  [Refereed]

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Context. H II regions in the arms of spiral galaxies are indicators of recent star-forming processes. They may have been caused by the passage of the density wave or simply been created by other means near the arms. The study of these regions may give us clues to clarify the controversy about the existence of a triggering scenario, as proposed in the density-wave theory.
Aims. If the passage of the density wave contributes significantly to the formation of H II regions in the arms of grand-design spirals, we can find a relationship in their position relative to the arms.
Methods. Using Ha direct imaging, we characterize the H II regions from a sample of three grand-design galaxies: NGC 5457, NGC 628, and NGC 6946. Broad-band images in R and I were used to determine the position of the arms. The H II regions found to be associated with arms were selected for the study. The age and star formation rate of these H II regions was obtained using measurements on the Ha line. The distance between the current position of the selected H II regions and the position they would have if they had been created in the centre of the arm was calculated. A parameter, T, which measures whether a region was created in the arm or in the disc, was defined.
Results. With the help of the T parameter we determine that the majority of regions were formed some time after the passage of the density wave, and the regions are located behind the zone they should have occupied (in the direction of the rotation of the galaxy) had they been formed in the centre of the arm. Moreover, the relative efficiency of the star formation rate between arm and interarm was calculated for all the galaxies.
Conclusions. The large number of regions created after the passage of the arm may be explained by the effect of the density wave, which helps to create the star-forming regions after its passage. There is clear evidence of triggering for NGC 5457 and a co-rotation radius is proposed. A more modest triggering seems to exist for NGC 628, and insignificant evidence of triggering is found for NGC 6946.

DOI

宇宙観を伝えよう

富田晃彦

理科教室   56 ( 11 ) 37 - 42   2013.11  [Invited]

特別支援学校での宇宙のお話

富田晃彦

ユニバーサルデザイン天文教育研究会 集録     2013.01

Astronomy Outreach Activity at Nursery School

Akihiko Tomita （Part： Lead author )

Proceedings of the 11th Asian-Pacific Regional IAU Meeting (July 2011, Chiang Mai, Thailand), NARIT Conference Series   1   508 - 509   2013

Student education at "Cosmic Journal Club"

Tomita Akihiko

Bulletin of the Center for Educational Research and Training ( Wakayama University )  22   139 - 146   2012.09

DOI

IAU 天文学推進室（OAD）の発足：Astronomy for a Better World

富田晃彦, 臼田-佐藤功美子 （Part： Lead author )

天文教育 ( 日本天文教育普及研究会 )  24 ( 5 ) 69 - 73   2012.09

Two-dimensional metallicity distribution of the ionized gas in NGC 628 and NGC 6946

B. Cedres, J. Cepa, A. Bongiovanni, H. Castaneda, M. Sanchez-Portal, A. Tomita

ASTRONOMY & ASTROPHYSICS ( EDP SCIENCES S A )  545   A43   2012.09  [Refereed]

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Aims. We present here two H II region catalogues with azimuthal resolution for the two grand design galaxies NGC 628 and NGC 6946. With the help of these catalogues, we study several properties of the star-forming processes occurring in spiral galaxies.
Methods. We obtained direct imaging in the narrow-band filters centred at H alpha, H beta, [O II]lambda 3727, and [O III]lambda lambda 4959, 5007 and their respective continua. After the calibration and correction of the data, we obtained for each H II region the de-reddened fluxes in the aforementioned lines, the size, the H alpha equivalent width, and, using two different empirical calibrations, the metallicity. Employing a method based on the Delaunay triangulation, a two-dimensional (2D) representation of the metallicity was obtained.
Results. Data for 209 H II regions of NGC 628 and 226 H II regions of NGC 6946 are obtained. The radial behaviours of the H alpha equivalent width, the excitation, and the oxygen abundance are derived. Two-dimensional representations of the metallicity and the excitation are calculated for the galaxies in the study. The two empirical calibrations of the metallicity are compared.
Conclusions. The behaviours of the extinction and the H alpha equivalent width are similar to those presented in the literature. The oxygen abundance gradients obtained in this study agree with previously published values. However, more regions were examined than in previous studies. We find a difference of about 0.6 dex between the two empirical calibrations employed. Finally, the 2D representations of the metallicity reveal high metallicity knots in NGC 628, and for NGC 6946 a high metallicity azimuthal structure is discovered. These high metallicity regions seem to be linked to the arms of the galaxies and are probably produced by an increase in the temperature of the ionizing clusters in the H II regions, which may be linked to variations in the initial mass functions of the galaxies between the arm and interarm regions.

DOI

2つの国際研究会EASE2011, APRIM2011に見える、天文教育とその国際協力における東・東南アジアでの動向

富田 晃彦

和歌山大学国際教育研究センター 年報   ( 8 ) 106 - 114   2012.03  [Refereed]

Photometric characteristics of CCD cameras equipped at astronomical observatory of Faculty of Education, Wakayama University

Tomita Akihiko

Bulletin of the Faculty of Education, Wakayama University. Natural science ( Wakayama University )  62   39 - 43   2012.02

DOI

保育園での「せいざものがたり」

富田晃彦, 河野明里

第25回天文教育研究会集録     163 - 165   2011.11

教育実習授業中に見られる「変化球」

富田 晃彦

和歌山大学教育学部附属教育実践総合センター 紀要   ( 21 ) 157 - 160   2011.09

Project SAZANKA: Multisite and Multifrequency Simultaneous SETI Observations in Japan

Shin-ya Narusawa, Mitsumi Fujishita, Hiroki Akisawa, Kenta Fujisawa, Yasuhide Fujita, Takahiro Fukuzumi, Hiromi Funakoshi, Hiroyuki Geshiro, Hideo Hara, Kenji Hashimoto, Tsutomu Hayamizu, Ryo Iizuka, Kazumasa Imai, Takeshi Inoue, Masayuki Kagami, Kazuhisa Kageyama, Takeshi Kamitamari, Masahiro Koishikawa, Shouta Maeno, Hidehiko Matsuo, Takashi Miyamoto, Masaki Morimoto, Hiroyuki Naito, Sumio Nakane, Takeshi Nakashima, Masami Okyudo, Takaaki Oribe, Takaaki Ozeki, Makoto Sakamoto, Yasuo Sano, Naoko Sato, Masayuki Tachikawa, Yoshimasa Tai, Setsuro Takahara, Yoshitaka Takahashi, Mikimasa Takeuchi, Naoto Tatsumi, Akihiko Tomita, Shinji Toyomasu, Naoki Toyoshima, Makoto Watanabe, Takeshi Yada, Ryoji Yamada, Michinari Yamamoto, Hideyo Yokotsuka

Communication with Extraterrestrial Intelligence, ed. Douglas A. Vakoch, State University of New York Press     109 - 124   2011.04

Astronomical Observatory of Faculty of Education, Wakayama University : Telescope and Instruments

Tomita Akihiko

Bulletin of the Faculty of Education, Wakayama University. Natural science ( Wakayama University )  61   17 - 22   2011.02

DOI

2009年7月22日の日食での気温変化

尾崎加織, 富田晃彦

学芸（和歌山大学教育学部学芸学会） ( 和歌山大学学芸学会 )  56 ( 56 ) 31 - 35   2010.03

ひかり保育園と Kaumana Keikiland のビデオメッセージ交換

富田晃彦, 岡田桂子, 井本トシミ, 臼田-佐藤功美子

和歌山大学国際教育研究センター年報   6   35 - 38   2010

和歌山での特別支援学校・院内学級への出張授業

富田晃彦 （Part： Lead author )

第23回天文教育研究会集録     116 - 119   2009.11