CHaMP Technical Details
A 20° section of the Galactic Plane, 300° > l > 280°
Latitude spread -4° < b < +2°
Total area = 120 sq.deg.
Nanten coverageTelescope: 4m diameter dish, beam FWHM 2.6 arcmin at 100 GHz
Maps as below with 2 arcmin pixels:
- 12CO line at 115.271 GHz, velocity coverage -60 to + 40 km/s, 0.1 km/s channels
- 13CO line at 110.301 GHz, velocity coverage -60 to + 40 km/s, 0.1 km/s channels
- C18O line at 109.781 GHz, velocity coverage -60 to + 40 km/s, 0.1 km/s channels
- HCO+ line at 89.189 GHz, velocity coverage -60 to + 40 km/s, 0.1 km/s channels
Identified 209 massive dense molecular clumps within GMCs from C18O and HCO+ maps, suitable for Mopra follow-up
Click the above map for a larger view, with corresponding region numbers as
referenced in the CHaMP I Paper.
Telescope: 22m diameter dish, beam FWHM 36" at 85-100 GHz (Ladd et al 2005)
Receiver: 3mm MMIC covering 75-116 GHz, Tsys < 200 K below 100 GHz in good weather
On-the-fly (OTF) mapping with super-Nyquist sampling (12" pixels after gridding) over square maps (typically a few arcmin across), rastering in RA, Dec, l, or b
Ta*(rms) < 0.2 K per 0.1 km/s channel after 2 orthogonally-rastered OTF maps in good weather
MOPS digital filterbankBandwidth: 8 GHz instantaneous, comprised of four 2 GHz blocks, with up to 128k spectral channels
Zoom mode: up to 4 in each block (16 total), each with 137 MHz bandwidth in 4096 channels × 2 polarisations, giving ~0.1 km/s spectral resolution (see schematic diagram)
2006 & 2007 spectral coverageFor these seasons we mapped 121 Nanten clumps at 85-93 GHz, including the following spectral lines (grouped by zoom mode):
- SiO maser line at 86.243 GHz
- H13CN line at 86.342 GHz
- H13CO+, HCO, SiO lines at ~86.8 GHz
- HCN line at 88.632 GHz
- HCO+ line at 89.189 GHz
- CH3CN line at 91.97 GHz
- N2H+ line at 93.173 GHz
2009 - Present spectral coverage
We are in the process of mapping the same clumps at 107-115 GHz, including the following spectral lines:
- CH3OH line at 108.89 GHz
- HC3N line at 109.17 GHz
- SO line at 109.25 GHz
- OCS line at 109.46 GHz
- C18O line at 109.78 GHz
- 13CO line at 110.20 GHZ
- C17O line at 112.36 GHz
- CN lines at 113.2–113.5 GHz
- CO line at 115.27 GHz
ASTE imaging – External Link ASTE –AzTEC bolometer camera map of a 5°×1° strip across the η Carinae GMC
AAT imaging – External Link AAT –
IRIS2 camera with 8 arcmin field in K band (2.2 μm), using multiple narrowband filters for wide-field imaging of a pilot sample of 5 molecular clumps during 2006-07:
- H2 v=1-0 S(1) line at 2.122 μm
- H2 v=2-1 S(1) line at 2.249 μm
- Brackett-γ line at 2.166 μm
- K-continuum filter covering a "line-free" band from 2.25-2.29 μm
First season of observations completed (25 Mopra clumps) in Feb-Mar 2011. Planning observations for 2012 to complete imaging of the remainder of 121 Mopra clumps in the above narrowband as well as broadband J, H, K filters. Data analysis is currently underway.
Gemini South – External Link Gemini South –
Multiband mid-IR imaging of BYF 73 using the T-ReCS camera, observations taken in June 2010, now being written up.
CTIO – External Link CTIO –Using the NEWFIRM camera on the Blanco 4m, imaging of J, H, Ks for 209 Nanten clumps was started in March 2011. Observations are planned for 2012 to complete survey. Data analysis is currently underway.
VLT – External Link VLT –
Very deep J, H, Ks photometry and astrometry of BYF 73 completed in Feb 2011. Data analysis is currently underway.
Spitzer Space Telescope – External Link SST –
GO Program 80024 awarded 73.5 hours for Cycle 8 in 2012 for deep imaging of 209 Nanten clumps in IRAC bands 1 and 2.