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DTSTART;TZID=Australia/Sydney:20210602T150000
DTEND;TZID=Australia/Sydney:20210602T160000
DTSTAMP:20260515T233119
CREATED:20250819T102456Z
LAST-MODIFIED:20250820T022746Z
UID:14998-1622646000-1622649600@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Michael Busch (Johns Hopkins University)
DESCRIPTION:Revealing the Galactic Dark H2 with OH\n\nAbstract\n\nThe intersection between the atomic and molecular interstellar medium (ISM) is still relatively mysterious. In the past two decades\, indirect gas tracers such as gamma-ray and dust emission have implied the existence of abundant molecular hydrogen (H2) not traced by our canonical molecular tracer\, the CO molecule. This H2 likely lies in diffuse clouds where CO will be not sufficiently collisionally excited or even photodissociated. I will discuss recent efforts in using the OH molecule in emission at 18cm to trace the large-scale Galactic dark H2\, and what we have learned about this previously invisible phase of the diffuse molecular ISM through ultra-sensitive (RMS ~ 1mK) 18cm OH emission surveys with the 100m Green Bank Telescope (GBT). Sensitive OH observations serendipitously revealed an immense amount of dark H2 in the Outer Galaxy in the form of a diffuse disk\, co-spatial with the atomic phase as traced by the HI 21cm line. I will also discuss upcoming GBT projects using the optically thin OH lines as a tool to investigate Galactic structure and present the (preliminary) first detection of thermal OH emission in another Galaxy (M31). \nWatch recording\nSlides\n\nRevealing the Galactic Dark H2 with OHDownload\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-michael-busch-johns-hopkins-university/
LOCATION:NSW
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-02062021.jpg
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DTSTART;TZID=Australia/Sydney:20210616T150000
DTEND;TZID=Australia/Sydney:20210616T160000
DTSTAMP:20260515T233119
CREATED:20250819T102425Z
LAST-MODIFIED:20250819T102426Z
UID:14997-1623855600-1623859200@www.atnf.csiro.au
SUMMARY:S&A Colloquium: James Miller-Jones (ICRAR / Curtin)
DESCRIPTION:Inefficient stellar winds from a massive black hole progenitor in the X-ray binary system Cygnus X-1\n\nAbstract\n\nThe high-mass X-ray binary system Cygnus X-1 contains one of the first known and best-studied black holes. We recently refined the distance to the source using astrometric very long baseline interferometry observations. The new distance implied that the component masses needed to be revised upwards\, with our modelling showing that the system hosts a 21-solar mass black hole. The formation of such a massive black hole in a Galactic environment with roughly solar metallicity challenges existing model prescriptions for the wind mass loss rates from massive stars. I will discuss our new measurements and their consequences for the likely formation and subsequent evolutionary pathway of the black hole\, and touch on their implications for massive star evolution and the formation of gravitational-wave sources. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-james-miller-jones-icrar-curtin/
LOCATION:NSW
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-16062021-scaled.jpg
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