Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-06-07
Astronomy and Astrophysics
Astrophysics
49 pages, 7 figures, 3 tables, accepted for publication in ApJ. Full resolution version available at http://www.asiaa.sinica
Scientific paper
10.1086/520825
We present the results of SiO millimeter-line observations of a sample of known SiO maser sources covering a wide dust-temperature range. A cold part of the sample was selected from the SiO maser sources found in our recent SiO maser survey of cold dusty objects. The aim of the present research is to investigate the causes of the correlation between infrared colors and SiO maser intensity ratios among different transition lines. In particular, the correlation between infrared colors and SiO maser intensity ratio among the J=1-0 v=1, 2, and 3 lines are mainly concerned in this paper. We observed in total 75 SiO maser sources with the Nobeyama 45m telescope quasi-simultaneously in the SiO J=1-0 v=0, 1, 2, 3, 4 and J=2-1 v=1, 2 lines. We also observed the sample in the 29SiO J=1-0 v=0 and J=2-1 v=0, and 30SiO J=1-0 v=0 lines, and the H2O 6(1,6)-5(2,3) line. As reported in previous papers, we confirmed that the intensity ratios of the SiO J=1-0 v=2 to v=1 lines clearly correlate with infrared colors. In addition, we found possible correlation between infrared colors and the intensity ratios of the SiO J=1-0 v=3 to v=1&2 lines. Two overlap lines of H2O (i.e., 11(6,6) nu_2=1 -> 12(7,5) nu_2=0 and 5(0,5) nu_2=2 -> 6(3,4) nu_2=1) might explain these correlation if these overlap lines become stronger with increase of infrared colors, although the phenomena also might be explained by more fundamental ways if we take into account the variation of opacity from object to object.
Deguchi Shuji
Nakashima Jun-ichi
No associations
LandOfFree
Correlation between Infrared Colors and Intensity Ratios of SiO Maser Lines does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Correlation between Infrared Colors and Intensity Ratios of SiO Maser Lines, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Correlation between Infrared Colors and Intensity Ratios of SiO Maser Lines will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-441941