11
CORNISH WORKSHOP Leeds, 13th April 2007
James Green
CORNISH WORKSHOP Leeds, 13th April 2007
James Green
The Methanol Multibeam The Methanol Multibeam
ProjectProjectThe Methanol Multibeam The Methanol Multibeam
ProjectProject
MMB
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The Methanol Multibeam The Methanol Multibeam Project:Project:
The TeamThe Team
The Methanol Multibeam The Methanol Multibeam Project:Project:
The TeamThe TeamR. J. Cohen, J. L. Caswell, K. R. J. Cohen, J. L. Caswell, K.
Brooks, M. G. Burton, A. Brooks, M. G. Burton, A. Chrysostomou, P. J. Diamond, Chrysostomou, P. J. Diamond, S. Ellingsen, G. A. Fuller, M. D. S. Ellingsen, G. A. Fuller, M. D. Gray, J. A. Green, M. G. Hoare, Gray, J. A. Green, M. G. Hoare,
M. R. W. Masheder, N. M. R. W. Masheder, N. McClure-Griffiths, M. McClure-Griffiths, M.
Pestalozzi, C. Phillips, L. Quinn, Pestalozzi, C. Phillips, L. Quinn, M. Thompson, M. Voronkov, A. M. Thompson, M. Voronkov, A. Walsh, D. Ward-Thompson, D. Walsh, D. Ward-Thompson, D. Wong-McSweeney, J. A. YatesWong-McSweeney, J. A. Yates.
R. J. Cohen, J. L. Caswell, K. R. J. Cohen, J. L. Caswell, K. Brooks, M. G. Burton, A. Brooks, M. G. Burton, A.
Chrysostomou, P. J. Diamond, Chrysostomou, P. J. Diamond, S. Ellingsen, G. A. Fuller, M. D. S. Ellingsen, G. A. Fuller, M. D. Gray, J. A. Green, M. G. Hoare, Gray, J. A. Green, M. G. Hoare,
M. R. W. Masheder, N. M. R. W. Masheder, N. McClure-Griffiths, M. McClure-Griffiths, M.
Pestalozzi, C. Phillips, L. Quinn, Pestalozzi, C. Phillips, L. Quinn, M. Thompson, M. Voronkov, A. M. Thompson, M. Voronkov, A. Walsh, D. Ward-Thompson, D. Walsh, D. Ward-Thompson, D. Wong-McSweeney, J. A. YatesWong-McSweeney, J. A. Yates.
33
ParticipantsParticipantsParticipantsParticipants
44
The 6.7 GHz Methanol MaserThe 6.7 GHz Methanol MaserThe 6.7 GHz Methanol MaserThe 6.7 GHz Methanol Maser
55
Why MMB? - Previous Why MMB? - Previous SurveysSurveys
Why MMB? - Previous Why MMB? - Previous SurveysSurveys
66
MMB 7-Beam ReceiverMMB 7-Beam ReceiverMMB 7-Beam ReceiverMMB 7-Beam Receiver
• Jointly built by Jodrell Jointly built by Jodrell Bank and ATNF.Bank and ATNF.
• Hexagonal layout Hexagonal layout pattern of 7 equal pattern of 7 equal receivers.receivers.
• Capable of dual Capable of dual polarisation over a polarisation over a large bandwidth. large bandwidth.
• Calibration with Calibration with noise injection noise injection sampled at 500Hz. sampled at 500Hz.
• Jointly built by Jodrell Jointly built by Jodrell Bank and ATNF.Bank and ATNF.
• Hexagonal layout Hexagonal layout pattern of 7 equal pattern of 7 equal receivers.receivers.
• Capable of dual Capable of dual polarisation over a polarisation over a large bandwidth. large bandwidth.
• Calibration with Calibration with noise injection noise injection sampled at 500Hz. sampled at 500Hz.
77
Survey Characteristics ISurvey Characteristics ISurvey Characteristics ISurvey Characteristics I• 4 MHz Bandwidth (4 MHz Bandwidth (180 km/s at 6668 MHz). 180 km/s at 6668 MHz). • Assume 150km/s fully useful bandwidth, so Assume 150km/s fully useful bandwidth, so
multiple centre velocities toward Galactic centre multiple centre velocities toward Galactic centre 10km/s overlap.10km/s overlap.
• Doppler tracking provided by the first two local Doppler tracking provided by the first two local oscillators. oscillators.
• Correlator configured to provide 2048 frequency Correlator configured to provide 2048 frequency channels across each 4 MHz band, at each line channels across each 4 MHz band, at each line frequency and each polarization. frequency and each polarization.
• Velocity resolution 0.09 km/s at 6668 MHz.Velocity resolution 0.09 km/s at 6668 MHz.• Spectra dumped every 5 seconds.Spectra dumped every 5 seconds.• System noise temperatures ~20 K.System noise temperatures ~20 K.
• 4 MHz Bandwidth (4 MHz Bandwidth (180 km/s at 6668 MHz). 180 km/s at 6668 MHz). • Assume 150km/s fully useful bandwidth, so Assume 150km/s fully useful bandwidth, so
multiple centre velocities toward Galactic centre multiple centre velocities toward Galactic centre 10km/s overlap.10km/s overlap.
• Doppler tracking provided by the first two local Doppler tracking provided by the first two local oscillators. oscillators.
• Correlator configured to provide 2048 frequency Correlator configured to provide 2048 frequency channels across each 4 MHz band, at each line channels across each 4 MHz band, at each line frequency and each polarization. frequency and each polarization.
• Velocity resolution 0.09 km/s at 6668 MHz.Velocity resolution 0.09 km/s at 6668 MHz.• Spectra dumped every 5 seconds.Spectra dumped every 5 seconds.• System noise temperatures ~20 K.System noise temperatures ~20 K.
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Survey Characteristics IISurvey Characteristics IISurvey Characteristics IISurvey Characteristics II• HPBW 3.2 arcmin at 6668 MHz HPBW 3.2 arcmin at 6668 MHz
and 3.4 arcmin at 6035 MHz.and 3.4 arcmin at 6035 MHz.• Beams spaced by 6.46 arcmin on Beams spaced by 6.46 arcmin on
sky.sky.• Multibeam footprint is 15arcmin Multibeam footprint is 15arcmin
across.across.• SPOT and MX observations to SPOT and MX observations to
monitor variation in calibration. monitor variation in calibration. • Blocks of 2Blocks of 2O O in in ll, ±2, ±2OO in in bb. . • Continuous scanning at 0.1Continuous scanning at 0.1OO min min--
11..• Optimal Orientation.Optimal Orientation.• Beam Sensitivity consistent to Beam Sensitivity consistent to
±3.5%.±3.5%.
• HPBW 3.2 arcmin at 6668 MHz HPBW 3.2 arcmin at 6668 MHz and 3.4 arcmin at 6035 MHz.and 3.4 arcmin at 6035 MHz.
• Beams spaced by 6.46 arcmin on Beams spaced by 6.46 arcmin on sky.sky.
• Multibeam footprint is 15arcmin Multibeam footprint is 15arcmin across.across.
• SPOT and MX observations to SPOT and MX observations to monitor variation in calibration. monitor variation in calibration.
• Blocks of 2Blocks of 2O O in in ll, ±2, ±2OO in in bb. . • Continuous scanning at 0.1Continuous scanning at 0.1OO min min--
11..• Optimal Orientation.Optimal Orientation.• Beam Sensitivity consistent to Beam Sensitivity consistent to
±3.5%.±3.5%.
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Results:Results: An Example Field An Example Field
Results:Results: An Example Field An Example Field
OBSERVATIONSOBSERVATIONS
LIVEDATALIVEDATA
GRIDZILLAGRIDZILLA
KVIS/KVIS/RESULTSRESULTS
1010
Survey ProgressSurvey ProgressSurvey ProgressSurvey Progress• Surveyed 106 degrees Surveyed 106 degrees
galactic longitude.galactic longitude.• Observed 528 masers, Observed 528 masers,
of which 218 new.of which 218 new.• 53/100 days Parkes 53/100 days Parkes
observing time.observing time.• Most new are weak Most new are weak
(S(Speakpeak < 4 Jy). < 4 Jy).• Narrow linewidths Narrow linewidths
(FWHM < 0.2 km/s).(FWHM < 0.2 km/s).• Far-side outer Galaxy Far-side outer Galaxy
detections.detections.
• Surveyed 106 degrees Surveyed 106 degrees galactic longitude.galactic longitude.
• Observed 528 masers, Observed 528 masers, of which 218 new.of which 218 new.
• 53/100 days Parkes 53/100 days Parkes observing time.observing time.
• Most new are weak Most new are weak (S(Speakpeak < 4 Jy). < 4 Jy).
• Narrow linewidths Narrow linewidths (FWHM < 0.2 km/s).(FWHM < 0.2 km/s).
• Far-side outer Galaxy Far-side outer Galaxy detections.detections.
1111
ObservationsObservations - regions surveyed - regions surveyedObservationsObservations - regions surveyed - regions surveyed
(180)
(270)(90)
(0/360)
1212
Observational DistributionObservational DistributionObservational DistributionObservational Distribution
ll vs vs bb
ll vs Velocity (LSR) vs Velocity (LSR)
0
-2.5
-2.0
-1.5
-1.0
-0.5
0.0
0.5
1.0
1.5
2.0
2.5
020406080100120140160180
1313
Survey Statistics - Galactocentric Survey Statistics - Galactocentric distancesdistances
Survey Statistics - Galactocentric Survey Statistics - Galactocentric distancesdistances
1414
Survey Statistics - Flux Survey Statistics - Flux distributiondistribution
Survey Statistics - Flux Survey Statistics - Flux distributiondistribution
MMBMMB
AreciboArecibo
1515
Excited OH ResultsExcited OH ResultsL.QuinnL.Quinn
Excited OH ResultsExcited OH ResultsL.QuinnL.Quinn
• Work in progress..Work in progress..• Work in progress..Work in progress..
1616
ATCA & MERLINATCA & MERLINATCA & MERLINATCA & MERLIN
• Positioning follow-up: Parkes positions Positioning follow-up: Parkes positions accurate to ± 30 arcsec. accurate to ± 30 arcsec.
• Capabilities to do it in both hemispheres Capabilities to do it in both hemispheres with ATCA and MERLIN:with ATCA and MERLIN:– ATCA ± 0.1 arcsecATCA ± 0.1 arcsec– MERLIN ± 0.01 arcsecMERLIN ± 0.01 arcsec
• ATCA observed and positioned all new ATCA observed and positioned all new detections.detections.
• MERLIN observed ~30 new in 20-30 MERLIN observed ~30 new in 20-30 region, positioned 25.region, positioned 25.
• Positioning follow-up: Parkes positions Positioning follow-up: Parkes positions accurate to ± 30 arcsec. accurate to ± 30 arcsec.
• Capabilities to do it in both hemispheres Capabilities to do it in both hemispheres with ATCA and MERLIN:with ATCA and MERLIN:– ATCA ± 0.1 arcsecATCA ± 0.1 arcsec– MERLIN ± 0.01 arcsecMERLIN ± 0.01 arcsec
• ATCA observed and positioned all new ATCA observed and positioned all new detections.detections.
• MERLIN observed ~30 new in 20-30 MERLIN observed ~30 new in 20-30 region, positioned 25.region, positioned 25.
1717
MERLIN Follow-up ExamplesMERLIN Follow-up ExamplesD. Wong-McSweeneyD. Wong-McSweeney
MERLIN Follow-up ExamplesMERLIN Follow-up ExamplesD. Wong-McSweeneyD. Wong-McSweeney
1818
Pulsar Survey PiggybackPulsar Survey PiggybackPulsar Survey PiggybackPulsar Survey Piggyback
• Deep integrations through pointed Deep integrations through pointed observations conducted as part of the pulsar observations conducted as part of the pulsar search program.search program.
• No Doppler tracking.No Doppler tracking.• Just Methanol 6668 MHz frequency.Just Methanol 6668 MHz frequency.• Correlator configured for 8 MHz over 4096 Correlator configured for 8 MHz over 4096
channels for 7 beams, 2 polarizations.channels for 7 beams, 2 polarizations.• Same spectral resolution, but over wider Same spectral resolution, but over wider
velocity range.velocity range.• Focused on Galactic Centre, but covering -60 Focused on Galactic Centre, but covering -60
< < ll < +45 (maximum +/- 0.5 in < +45 (maximum +/- 0.5 in bb).).
• Deep integrations through pointed Deep integrations through pointed observations conducted as part of the pulsar observations conducted as part of the pulsar search program.search program.
• No Doppler tracking.No Doppler tracking.• Just Methanol 6668 MHz frequency.Just Methanol 6668 MHz frequency.• Correlator configured for 8 MHz over 4096 Correlator configured for 8 MHz over 4096
channels for 7 beams, 2 polarizations.channels for 7 beams, 2 polarizations.• Same spectral resolution, but over wider Same spectral resolution, but over wider
velocity range.velocity range.• Focused on Galactic Centre, but covering -60 Focused on Galactic Centre, but covering -60
< < ll < +45 (maximum +/- 0.5 in < +45 (maximum +/- 0.5 in bb).).
1919
Magellanic CloudsMagellanic CloudsMagellanic CloudsMagellanic Clouds
• Slightly different technique.Slightly different technique.• Pointed MX observations as well.Pointed MX observations as well.• 1 new Methanol & 1 new excited 1 new Methanol & 1 new excited
OH.OH.
• Slightly different technique.Slightly different technique.• Pointed MX observations as well.Pointed MX observations as well.• 1 new Methanol & 1 new excited 1 new Methanol & 1 new excited
OH.OH.
2020
The Work Plan : 2007-The Work Plan : 2007-20112011
The Work Plan : 2007-The Work Plan : 2007-20112011
• Parkes Multibeam survey till 2008.Parkes Multibeam survey till 2008.• ATCA positions, snapshots and 8.4 GHz ATCA positions, snapshots and 8.4 GHz
continuum.continuum.• MERLIN positions and snapshots.MERLIN positions and snapshots.• Distances and Galactic Distribution.Distances and Galactic Distribution.• Jodrell Bank Multibeam survey 2008-2010.Jodrell Bank Multibeam survey 2008-2010.• MMB catalogue of Milky Way.MMB catalogue of Milky Way.• MMB survey of LMC/SMC.MMB survey of LMC/SMC.• Simultaneous survey of excited OH 6035 MHz.Simultaneous survey of excited OH 6035 MHz.• Methanol deep fields at Pulsar pointings.Methanol deep fields at Pulsar pointings.
• Parkes Multibeam survey till 2008.Parkes Multibeam survey till 2008.• ATCA positions, snapshots and 8.4 GHz ATCA positions, snapshots and 8.4 GHz
continuum.continuum.• MERLIN positions and snapshots.MERLIN positions and snapshots.• Distances and Galactic Distribution.Distances and Galactic Distribution.• Jodrell Bank Multibeam survey 2008-2010.Jodrell Bank Multibeam survey 2008-2010.• MMB catalogue of Milky Way.MMB catalogue of Milky Way.• MMB survey of LMC/SMC.MMB survey of LMC/SMC.• Simultaneous survey of excited OH 6035 MHz.Simultaneous survey of excited OH 6035 MHz.• Methanol deep fields at Pulsar pointings.Methanol deep fields at Pulsar pointings.
2121
MMB-CORNISH OverlapMMB-CORNISH OverlapMMB-CORNISH OverlapMMB-CORNISH Overlap
2222
-1.00
-0.50
0.00
0.50
1.00
10.015.020.025.030.035.040.045.050.055.060.0
Longitude
Latitude
New
Known
MMB-CORNISH MMB-CORNISH COINCIDENCESCOINCIDENCESMMB-CORNISH MMB-CORNISH COINCIDENCESCOINCIDENCES
2323
MMB-CORNISH MMB-CORNISH COINCIDENCESCOINCIDENCESMMB-CORNISH MMB-CORNISH COINCIDENCESCOINCIDENCES
-0.850
-0.350
0.150
0.650
20.00022.00024.00026.00028.00030.00032.00034.000
Longitude
Latitude
MMB
CORNISH
2424
MMB-CORNISH MMB-CORNISH COINCIDENCESCOINCIDENCESMMB-CORNISH MMB-CORNISH COINCIDENCESCOINCIDENCES
-0.350
-0.250
-0.150
-0.050
0.050
0.150
0.250
0.350
0.450
22.00023.00024.00025.00026.00027.00028.00029.00030.00031.00032.000
Longitude
Latitude
MMB
CORNISH
2525
MMB-CORNISH MMB-CORNISH COINCIDENCESCOINCIDENCESMMB-CORNISH MMB-CORNISH COINCIDENCESCOINCIDENCES
-0.450
-0.350
-0.250
-0.150
-0.050
0.050
0.150
0.250
0.350
0.450
0.550
22.00023.00024.00025.00026.00027.00028.00029.00030.00031.00032.000
Longitude
Latitude
CORNISH
8 Jy
3 Jy
7.5 Jy
4 Jy
1.1 Jy
0.8 Jy
2.6 Jy
2.6 Jy
2626
ConclusionConclusionConclusionConclusion
• MMB first full Galactic plane survey.MMB first full Galactic plane survey.• 528 detections & counting528 detections & counting• MMB-CORNISH overlap looks very MMB-CORNISH overlap looks very
promising.promising.
• MMB first full Galactic plane survey.MMB first full Galactic plane survey.• 528 detections & counting528 detections & counting• MMB-CORNISH overlap looks very MMB-CORNISH overlap looks very
promising.promising.