![[PukiWiki]](http://www2.nao.ac.jp/~aste-www/aste_wiki/obs.jpg "[PukiWiki]")
#author("2021-10-03T17:42:47+09:00","default:astewww","astewww") #author("2021-10-03T17:43:02+09:00","default:astewww","astewww") [[ASTE Wiki]] * Demo [CI](3P2-3P1) and CO(J=7-6) maps of a massive star forming region Orion KL [#h8123b9f] :Last update| -- 2021-08-03 released. //-- 2021-06-04 CO maps were added. //-- 2021-03-11 created. :Table of contents| #contents ---- ** Data archive [#q3518555] //- [[CASA data (image FITS, CASA MS2)>http://aste.nao.ac.jp/DemoData/CASA.tar]] (~1.5GB) - [CI](3P2-3P1) data (CASA image FITS, 8.5MB) -- &ref(20210303KLCIxy_0.5kms.cat10casa.corrected.fits); - CO(J=7-6) data (CASA image FITS, 17.0MB) -- &ref(20210303KLCOxy_0.5kms.cat10casa.fits); #br - Note that these image FITS files were generated from NOSTAR FITS files using the following script. -- &ref(Nostar_to_CASA_CAT10_CI.py); --- This script just modifies headers of NOSTAR FITS files to avoid header errors at their import to CASA. ** Data information [#i092b09f] | Target |>| Orion KL (OMC-1) | | Observation date |>| 2019/10 - 2019/11 | | Receiver |>| CAT10 (DSB) | | Spectrometer |>| WHSF (FX mode) | | Mode |>| OTF mapping | | Target line | [CI](3P2-3P1) | CO(J=7-6) | | Frequency | 809.341970 GHz | 806.651806 GHz | | Bandwidth |>| 1024 MHz | | Channel spacing |>| 0.5 MHz | | Velocity resolution |>| smoothed to 0.5 km/s | //| Beam size (FWHM) |>| 9.3 x 9.9 arcsec | | Beam size (FWHM) |>| 12.6 arcsec x 13.1 arcsec (after convolution with the spheroidal function) | | Mapping size | 8 arcmin x 10 arcmin | 4 arcmin x 8 arcmin | | Total mapping time | ~15 hrs | ~4 hrs | | Tsys |>| 2000 K at the zenith | | PWV |>| ~0.5 - 0.8 mm | ** Data calibration [#g1af111a] - Intensity calibration -- The daily variation of the system gain for the CO(J=7-6) data was corrected by daily measurements of CO(J=7-6) peak intensity toward Orion IRc2. We also estimated a beam efficiency for the CO data at the position of Orion IRc2, whose absolute value was measured to be Tmb = 202 K by CSO observations (Furuya and Shinnaga 2009, ApJ, 703, 1198), and already applied the efficiency to the CO data. -- The daily variation of the system gain for the [CI](3P2-3P1) data was corrected using same scaling factors as those for the CO(J=7-6) data. Tmb of [CI](3P2-3P1) at Orion IRc2 was derived from multiplying Tmb of CO(J=7-6) by Furuya et al. (2009) with a [CI]/CO intensity scaling factor. The intensity scaling factor between the two lines was estimated at the position of Orion IRc2 by their quasi-simultaneous observations assuming the beam efficiencies at the frequencies of the two lines were comparable. Finally, we calibrated the absolute intensity of the [CI] data using the derived Tmb in the same way as the CO data. - Weak emission line at off-position for the [CI] observations -- We found weak line contamination in the off-position (-500" in Right Ascension from Orion KL) of the [CI] observations. The peak intensity of the emission in the off-position is estimated to be 3.9 +/- 0.7 K in Tmb, which corresponds to 1.7sigma of the noise level of the [CI] data. Although the impact on the data should be minor, we added the spectrum of the off-position to the [CI] data to recover the emission in the off-position. ** Sample images [#e570dc67] - [CI](3P2-3P1) #br |BGCOLOR(#FFFFFF):CENTER: |BGCOLOR(#FFFFFF):CENTER: |c |BGCOLOR(#D0D8E0): [CI] - Integrated intensity map |BGCOLOR(#D0D8E0): [CI] - Peak intensity map | |&ref(20210303KLCIxy_0.5kms.cat10casa.corrected.mom0.jpg,,50%);|&ref(20210303KLCIxy_0.5kms.cat10casa.corrected.peak.jpg,,50%);| |LEFT: - Integrated v_LSR range = 0 km/s ~ +20 km/s|| |BGCOLOR(#D0D8E0): [CI] - RMS map || |&ref(20210303KLCIxy_0.5kms.cat10casa.corrected.rms.jpg,,50%);|~| |LEFT: - RMS v_LSR range = -20 km/s ~ -50 km/s|~| - -- Note that non-uniform noise levels can be seen in the RMS map. #br - CO(J=7-6) #br |BGCOLOR(#FFFFFF):CENTER: |BGCOLOR(#FFFFFF):CENTER: |c |BGCOLOR(#D0D8E0): CO - Integrated intensity map |BGCOLOR(#D0D8E0): CO - Peak intensity map | |&ref(20210303KLCO_mom0_linear.jpg,,50%);|&ref(20210303KLCO_peak.jpg,,50%);| |LEFT: - Integrated v_LSR range = -40 km/s ~ +50 km/s|| |BGCOLOR(#D0D8E0): CO - RMS map || |&ref(20210303KLCOxy_0.5kms.cat10casa.rms.500_520.jpg,,50%);|~| |LEFT: - RMS v_LSR range = +100 km/s ~ +110 km/s|~| - -- Note that non-uniform noise levels can be seen in the RMS map. ** Acknowledgement and references in publications [#i7fa1456] *** Acknowledgement [#y1fd402a] - Please include the following statement in the acknowledgement, when you publish your studies using the ASTE demo science data: #br The ASTE demo science data collection was partially supported by JSPS KAKENHI Grant No. 18H03725. *** References [#tf1eab4d] - Band10 receiver -- Ito, T., et al. 2020, Proc. SPIE, 114533Q - CSV for the Band10 receiver - CSV of the Band10 receiver -- Kamazaki, T., et al. 2020, Proc. SPIE, 114533X //- Please include the following paper for the reference to the ASTE demo science data. //#br
