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A “New” Spiral Arm for the Milky Way? ATNF News Issue No. 53, June 2004 ISSN 1323-6326 FEATURES IN THIS A “new” spiral arm ISSUE for the Milky Way? A “new” N. M. McClure-Griffiths, J. M. Dickey, B. M. Gaensler & A. J. Green spiral arm for the Milky Way? The structure of the outer disk of the SGPS longitude-velocity (l-v) diagram. Page 1 Milky Way has long been a mystery to The l-v diagram shows HI emission in From the Director Galactic astronomers. Though we know the Galactic mid-plane (b = 0°). Emission Page 3 that the neutral hydrogen (HI) disk at negative velocities is interior to the extends far beyond the stellar disk, we solar circle and corresponds to gas at Bob Duncan: know very little about its structure in two distances, whereas emission at 1929 – 2004 this Galactic “outback”. In particular, positive velocities lies exterior to the Page 4 we do not know how far the HI spiral solar circle and generally corresponds to structure of the Galaxy extends. only one distance with larger velocities at The ALFA story larger distances. The new ridge of Page 6 As part of the Southern Galactic Plane emission arcs from l = 253°, v = 102 -1 -1 Narrabri Survey (SGPS; McClure-Griffiths et al. km s through l = 299°, v = 110 km s to atmospheric 2001) we have recently identified a l = 321°, v = 88 km s-1. It is relatively seeing monitor remarkable structure in the far outer cohesive across more than 70 degrees on Page 8 disk of the southern Milky Way. This the sky, kinematically distinct from its structure, shown near the top of surroundings, and is notably the last Remote visualisation service Figure 1, is a ridge of emission lying at feature before the edge of the Galactic the far positive-velocity edge of the disk. Overlaid on Figure 1 are lines of Page 10 Continued on page 20 Mopra induction weekend Page 12 A search for OH megamasers in ultra-luminous infrared galaxies Page 16 SKA program report Page 22 ATNF outreach Page 23 Figure 1: HI longitude-velocity (l-v) diagram of the Southern Galactic Plane showing the outer arm. The arm is observed as a ridge of emission at the most extreme positive velocities. The image has an angular resolution of 2 arcmin, a spectral resolution of 0.8 km s-1, and uses a square-root transfer function from 1 to 70 K. The solid lines are at constant Galactocentric radii of 16 and 24 kpc. (From McClure-Griffiths et al. 2004). Editorial Welcome to the June 2004 ATNF newsletter. commissioned at the Compact Array, the laudable work on the outreach front and the soon-to-be- For this issue we have made a special effort to released utility, the Remote Visualisation System, a streamline the article submission process and project for the Australian Virtual Observatory. towards this goal we sent out a guidelines section in our call for article contributions. Our thanks and We have an obituary on Bob Duncan, ATNF appreciation to all for your help and cooperation. The astronomer, whose sudden passing was a shock to all guidelines for contributors have been placed on the who knew him. We are happy to have had the web at www.atnf.csiro.au/news/newsletter/ opportunity to present his most recent work in this guidelines.html. newsletter – just an issue ago. In our cover page article in this issue Naomi We are always happy to receive your contributions. McClure-Griffiths describes the discovery of a Your suggestions and comments on the newsletter “new” spiral arm for our Galaxy, an outcome of the are welcome! You can contact us at Southern Galactic Plane Survey carried out by her [email protected]. The web version of with the Compact Array and Parkes radio telescope. current and previous newsletters can be found at On page 16 first results from a systematic search for www.atnf.csiro.au/news/newsletter. OH megamasers in high IR-luminosity galaxies are described, a project putting to good use the unique Lakshmi Saripalli, Jessica Chapman and Joanne capabilities of the Compact Array. We bring you Houldsworth news on several other developments, in particular the ATNF News Production team useful Seeing Monitor that was recently ([email protected]) Contents A “new” spiral arm for the Milky Way? .................................................................................................. 1 From the Director .................................................................................................................................... 3 Bob Duncan: 1929 – 2004 ....................................................................................................................... 4 The ALFA story ....................................................................................................................................... 6 Narrabri atmospheric seeing monitor ....................................................................................................... 8 Remote visualisation service .................................................................................................................. 10 ATNF crossword ....................................................................................................................................11 Mopra induction weekend ...................................................................................................................... 12 ATNF apprentices.................................................................................................................................. 13 Distinguished visitor program ................................................................................................................. 13 New postdoctoral fellows ...................................................................................................................... 14 ATNF graduate student program ........................................................................................................... 15 A search for OH megamasers in ultra-luminous infrared galaxies ........................................................ 16 SKA program report .............................................................................................................................. 22 ATNF outreach ...................................................................................................................................... 23 Compact Array and Mopra report ......................................................................................................... 25 Parkes Observatory report .................................................................................................................... 27 Time assignment information ................................................................................................................. 29 ATNF publications list ............................................................................................................................ 30 Page 2 ATNF News, Issue No. 53, June 2004 News From the Director At the start of 2004, the Prime Minister’s Science ATNF also remains committed to maximising and Engineering Innovation Council (PMSEIC) Australia’s engagement in the international SKA convened a small working-group of scientists and program through its Major National Research engineers, chaired by Martin Cole, to prepare a Facility (MNRF) funded projects. In this newsletter report on Australian astronomy. The working group’s we report on the decision to halt the development brief was to provide a stocktake of Australian work on Luneburg lenses as an SKA prototype and astronomy’s capabilities, the impacts on, and benefits on plans to re-focus the New Technology to, Australian society and possible future priorities. Demonstrator (NTD) as a low-frequency prototype The report was presented to PMSEIC on 17 June array at the representative Australian SKA candidate and is now publicly available. As a member of the site in Mileura, Western Australia. For the coming working group, I was both delighted and privileged to nine months, the short-term goal in the NTD have the opportunity to present the ongoing success program is to complete a preliminary evaluation of story of “Astronomy Australia” at the highest level the technologies in the concentrator/focal-plane- within the Commonwealth Government. array space, with a view to taking forward the most effective technology to prototype development, and The report emphasised the cohesiveness of MNRF project completion in mid-2007. Australian astronomy, from its scientific success to its technology impact both within the research sector At their recent meeting, the AT Users’ Committee (through astronomical instrumentation) and beyond. strongly supported this proposed outline plan for the Astronomy’s role in inspiring young people to study NTD. Together with the Compact Array broadband science and engineering was also highlighted. Finally, upgrade, ATUC endorsed that the highest priority at some of the bold visions for the future of Australian the ATNF be given to these MNRF programs over astronomy were enunciated, including participation in the next two to three years, in line with similar the Square Kilometre Array (SKA) and optical/IR recommendations made by the Steering Committee Extremely Large Telescope (ELT) projects. in April. This strong alignment of ATNF’s stakeholders in a shared vision for the future of radio As part of “walking the talk” it is reassuring to note astronomy, coupled with the success of the more just how many aspects addressed in the PMSEIC broadly-based PMSEIC report, augers well for the report also feature in this newsletter via examples of development
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