First results from HOPS The H2O southern Galactic Plane Survey

1
First results from HOPS(The H2O southern
Galactic Plane Survey)

• Andrew Walsh (JCU)
• Michael Burton (UNSW)
• Graeme White (JCU)
• Steven Longmore (CfA, USA)
• Cormac Purcell (U. Manchester)
• Nadia Lo (UNSW)
• Kate Brooks (ATNF)
• Chris Phillips (ATNF)
• Shari Breen (UTas)

Summary at http//www.jcu.edu.au/astronomy/awalsh
/HOPS/
2
AIMS

• Survey the southern Galaxy with Mopra at 12mm
• 90 square degrees at 2 arcminute resolution
  l300? - 30? b lt 0.5?
• Use MOPS zoom mode to survey multiple lines

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Main lines surveyed

• H2O maser
• NH3 (1,1), (2,2), (3,3), (6,6), (9,9)
• HC3N (3-2)
• H69a radio recombination line
• Many CH3OH lines
• Many others including H62a, H64a, H65a, NH3
  (non-metastable), CCS, HC5N

4
Current status

• Feb/March 2008 completed 31 square degrees

(b)
5
Current status

• Feb/March 2008 completed 31 square degrees

6
Current status

• Feb/March 2008 completed 31 square degrees
• 700 hours observations
• Lost only 50 hours due to weathertechnical

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l300-310
H2O Masers
NH3 (1,1)
NH3 (2,2)
NH3 (3,3)
HC3N(3-2)
H69a
8
l330-340
H2O Masers
NH3 (1,1)
NH3 (2,2)
NH3 (3,3)
HC3N(3-2)
H69a
9
l359-010
H2O Masers
NH3 (1,1)
NH3 (2,2)
NH3 (3,3)
HC3N(3-2)
H69a
10
l359-010
H2O Masers
NH3 (1,1)
NH3 (2,2)
NH3 (3,3)
HC3N(3-2)
H69a
11
l359-010
H2O Masers
NH3 (1,1)
NH3 (2,2)
NH3 (3,3)
HC3N(3-2)
H69a
12
l359-010
H2O Masers
NH3 (1,1)
NH3 (2,2)
NH3 (3,3)
HC3N(3-2)
H69a
13
l359-010
H2O Masers
NH3 (1,1)
NH3 (2,2)
NH3 (3,3)
HC3N(3-2)
H69a
14
l359-010
H2O Masers
Post-AGB star Water Fountain (Deacon et al. 2007)
NH3 (1,1)
NH3 (2,2)
NH3 (3,3)
HC3N(3-2)
H69a
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Results (i)

• 199 H2O maser sites (151 New 76)
• 6.4 maser sites per square degree (4.9 new per
  square degree)
• New detections comparable to MMB survey!
• MMB so far surveyed 2/3 of the Galactic
  Plane
• ? gt800 masers and 350 new detections
• ? 500 predicted total new detections for
  both HOPS and MMB.

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Results (ii)

• 500 NH3 (1,1) clumps widespread
• Widespread detections in NH3 (2,2), (3,3), HC3N
  (3-2), radio recombination lines
• Occasional detection of CH3OH lines at 24928,
  24933, 24934, 24959, 25018, 25124MHz, HC5N, NH3
  (6,6) and (9,9)

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To-do List

• Characterise Mopra beam at 12mm
• Fix absolute flux scale at 12mm (efficiency)
• Determine appropriate detection limit for H2O
  masers
• Derive consistent framework for calculating
  physical characteristics of NH3 clumps
• Publish data!
• Follow up observations with both Mopra and ATCA