CHaMP - The Galactic Census of High and Medium-mass Protostars

CHaMP Technical Details

 

 

Observation window

A 20° section of the Galactic Plane, 300° > l > 280°

Latitude spread -4° < b < +2°
Total area = 120 sq.deg.

3mm Observations

Nanten coverage

Telescope: 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
Ta*(rms) ~ 0.1 K.km/s
Identified 209 massive dense molecular clumps within GMCs from C18O and HCO+ maps, suitable for Mopra follow-up

Mopra coverage

 

Click the above map for a larger view, with corresponding region numbers as

referenced in CHaMP Paper I.

 

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) < 0.3 K per 0.1 km/s channel after 2 orthogonally-rastered OTF maps in good weather.

MOPS digital filterbank

Bandwidth: 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 coverage

For 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

The first Data Release (DR1) is described in CHaMP Paper I (Barnes et al. 2011; see Papers & Posters). Full data cubes, moment maps and data tables are accessible for download here.

 

2009 - 2012 spectral coverage

In these seasons we additionally mapped the same clumps at 107-115 GHz, in 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

The 12CO data are described in CHaMP Paper III (Barnes et al. 2016; see Papers & Posters), and available for download in DR3.

The 13CO and C18O data are further described in CHaMP Paper IV (Barnes et al. 2018; see Papers & Posters), and available for download in DR4.

 


1mm Observations

ASTE imaging – External Link ASTE –

AzTEC bolometer camera map of a 5°×1° strip across the η Carinae GMC

IR Observations

AAT imaging – External Link AAT –

    Service Time

    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

     

    Full Survey

    Observations made in 2011 and 2012 of 146/303 of the Mopra clumps, in the above narrowband filters plus broadband J, H, K filters. First results of this IR work are described in CHaMP Paper I.5 (Barnes et al 2013; see Papers & Posters), and available for download in DR2. Further data analysis continues.

Gemini South – External Link Gemini South –

Multiband mid-IR imaging of BYF 73 using the T-ReCS camera from observations in 2010 are described by Pitts et al 2018 (see Papers & Posters).

 

CTIO – External Link CTIO –

Using the NEWFIRM camera on the Blanco 4m, J, H, Ks imaging of the remaining Mopra clumps was obtained in 2011 and 2012. Data analysis is underway.

 

VLT – External Link VLT –

Very deep J, H, Ks photometry and astrometry of BYF 73 with HAWK-I was obtained in 2011, and results are described by Andersen et al 2017 (Papers & Posters).

 

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.

 

 

...(More details forthcoming)...