AKARI infrared imaging of reflection nebulae IC 4954 and IC 4955

Daisuke Ishihara, Takashi Onaka, Hidehiro Kaneda, Toyoaki Suzuki, Hirokazu Kataza, Itsuki Sakon, Yoko Okada, Yasuo Doi, Naofumi Fujishiro, Hideaki Fujiwara, Yoshifusa Ita, Tuneo Kii, Woojung Kim, Sin'itirou Makiuti, Toshio Matsumoto, Hideo Matsuhara, Hiroshi Murakami, Takao Nakagawa, Youichi Ohyama, Shinki OyabuStephen Serjeant, Hiroshi Shibai, Toshinobu Takagi, Toshihiko Tanabé, Kazunori Uemizu, Munetaka Ueno, Fumihiko Usui, Takehiko Wada, Hidenori Watarai, Issei Yamamura

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

We present the observations of the reflection nebulae IC 4954 and IC 4955 region with the Infrared Camera and the Far-Infrared Surveyor (FIS) on board the infrared astronomical satellite AKARI during its performance verification phase. We obtained 7 band images from 7 to 160μm with higher spatial resolution and higher sensitivities than previous observations. The spatial variation in the mid-infrared color suggests that the star-formation in IC 4954/4955 is progressing from south-west to north-east. The FIS 4-band data from 65 μm to 160/z m allow us to correctly estimate the total infrared luminosity from the region, which is about one sixth of the energy emitted from the existing stellar sources. Five candidates for young stellar objects have been detected as point sources for the first time in the 11 μm image and it is suggested that that current star-formation has been triggered by previous star-formation activities. A wide area map of the size of about Io around the IC 4954/4955 region was created from the AKARI mid-infrared All-Sky Survey data. Together with the H 121 cm data, it suggests a large hollow structure of a degree scale, on whose edge the IC 4954/4955 region has been created, indicating star formation over three generations in largely different spatial scales.

Original languageEnglish
JournalPublications of the Astronomical Society of Japan
Volume59
Issue numberSPEC. ISS. 2
Publication statusPublished - 2007 Dec 14
Externally publishedYes

Keywords

  • ISM: individual (IC 4954, IC 4955)
  • Infrared: ISM
  • Open clusters: Individual (Roslund 4)
  • Stars: star formation

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Ishihara, D., Onaka, T., Kaneda, H., Suzuki, T., Kataza, H., Sakon, I., Okada, Y., Doi, Y., Fujishiro, N., Fujiwara, H., Ita, Y., Kii, T., Kim, W., Makiuti, S., Matsumoto, T., Matsuhara, H., Murakami, H., Nakagawa, T., Ohyama, Y., ... Yamamura, I. (2007). AKARI infrared imaging of reflection nebulae IC 4954 and IC 4955. Publications of the Astronomical Society of Japan, 59(SPEC. ISS. 2).