FAR-INFRARED IMAGING OBSERVATIONS OF THE CHAMAELEON REGION

被引:4
|
作者
Ikeda, Norio [1 ]
Kitamura, Yoshimi [1 ]
Takita, Satoshi [1 ]
Ueno, Munetaka [1 ]
Suzuki, Toyoaki [1 ]
Kawamura, Akiko [2 ]
Kaneda, Hidehiro [2 ]
机构
[1] Japan Aerosp Explorat Agcy, Inst Space & Astronaut Sci, Chuo Ku, Sagamihara, Kanagawa 2525210, Japan
[2] Nagoya Univ, Dept Astrophys, Chikusa Ku, Nagoya, Aichi 4648602, Japan
来源
ASTROPHYSICAL JOURNAL | 2012年 / 745卷 / 01期
关键词
ISM: clouds; ISM: individual objects (Chamaeleon); stars: formation; STAR-FORMING REGION; ALL-SKY SURVEY; BACKGROUND EXPERIMENT SEARCH; GALACTIC PLANE SURVEY; DARK-CLOUD COMPLEX; CO COLUMN DENSITY; H I FLOWS; MOLECULAR CLOUDS; MILKY-WAY; INTERSTELLAR CLOUDS;
D O I
10.1088/0004-637X/745/1/48
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We have carried out far-infrared imaging observations toward the Chamaeleon star-forming region by the Far-Infrared Surveyor (FIS) on board the AKARI satellite. The AKARI images cover a total area of 33.79 deg(2), corresponding to 210 pc(2) at the distance to the source. Using the FIS bands of 65-160 mu m and the COBE/DIRBE bands of 60-240 mu m, we constructed column density maps of cold (11.7 K) and warm (22.1 K) dust components with a linear resolution of 0.04 pc. On the basis of their spatial distributions and physical properties, we interpret that the cold component corresponds to the molecular clouds and the warm one the cold H I clouds, which are thought to be in a transient phase between atomic and molecular media. The warm component is shown to be uniformly distributed at a large spatial scale of similar to 50 pc, while a several pc-scale gradient along the east-west direction is found in the distribution of the cold component. The former is consistent with a formation scenario of the cold H I clouds through the thermal instability in the warm neutral medium triggered by a 100 pc scale supernova explosion. This scenario, however, cannot produce the latter, several pc-scale gradient in molecular cloud mass. We conclude that the gravitational fragmentation of the cold Hi cloud likely created the molecular clouds with spatial scale as small as several pc.
引用
收藏
页数:21
相关论文
共 50 条
  • [1] Far-infrared spectroscopic observations of the Galactic center region
    Yasuda, A.
    Nakagawa, T.
    Spaans, M.
    Okada, Y.
    Kaneda, H.
    [J]. ASTRONOMY & ASTROPHYSICS, 2008, 480 (01) : 157 - 166
  • [2] Far-infrared spectral observations of the galaxy by the far-infrared absolute spectrophotometer
    Reach, WT
    [J]. UNSOLVED PROBLEMS OF THE MILKY WAY, 1996, (169): : 567 - 573
  • [3] AIRBORNE FAR-INFRARED OBSERVATIONS OF GALACTIC-CENTER REGION
    GATLEY, I
    BECKLIN, EE
    WERNER, MW
    WYNNWILLIAMS, CG
    [J]. ASTROPHYSICAL JOURNAL, 1977, 216 (01): : 277 - 290
  • [4] AKARI Far-Infrared Spectroscopic Observations of the Galactic Center Region
    Yasuda, Akiko
    Kaneda, Hidehiro
    Nakagawa, Takao
    Okada, Yoko
    Kawada, Mitsunobu
    Murakami, Noriko
    Takahashi, Hidenori
    Ootsubo, Takafumi
    [J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 2009, 61 (03) : 511 - 520
  • [5] AKARI Far-Infrared Spectroscopic Observations of the Galactic Center Region
    Yasuda, Akiko
    Kaneda, Hidehiro
    Nakagawa, Takao
    Okada, Yoko
    Kawada, Mitsunobu
    Murakami, Noriko
    Takahashi, Hidenori
    Ootsubo, Takafumi
    [J]. AKARI, A LIGHT TO ILLUMINATE THE MISTY UNIVERSE, 2009, 418 : 423 - +
  • [6] FAR-INFRARED OBSERVATIONS OF GLOBULES
    KEENE, J
    [J]. ASTROPHYSICAL JOURNAL, 1981, 245 (01): : 115 - 123
  • [7] POLARIZER FOR THE FAR-INFRARED REGION
    MITSUISHI, A
    YAMADA, Y
    FUJITA, S
    YOSHINAGA, H
    [J]. JOURNAL OF THE OPTICAL SOCIETY OF AMERICA, 1960, 50 (05) : 433 - 436
  • [8] FAR-INFRARED OBSERVATIONS OF GALACTIC NUCLEI
    RICKARD, LJ
    HARVEY, PM
    [J]. ASTRONOMICAL JOURNAL, 1984, 89 (10): : 1520 - 1530
  • [9] FAR-INFRARED OBSERVATIONS OF CENTAURUS-A
    MARSTON, AP
    DICKENS, RJ
    [J]. ASTRONOMY & ASTROPHYSICS, 1988, 193 (1-2) : 27 - 39
  • [10] FAR-INFRARED OBSERVATIONS OF NIGHT SKY
    HOUCK, JR
    HARWIT, M
    [J]. SCIENCE, 1969, 164 (3885) : 1271 - &