The UHH Research Park includes the headquarters for the East Asian Observatory, the Caltech Submillimeter Observatory, Subaru, Gemini, UKIRT, the Smithsonian Submillimeter Array and the Institute for Astronomy, plus the astronomers at the University of Hawaii at Hilo. We are one of the major centres for astronomy in the world and encourage all visitors to the JCMT to take advantage of the proximity of these institutes, and give a seminar while in Hilo. Your talk will be advertised at each of the above institutes.
Upcoming Seminar: March 21st, 2018, 2pm (HST)
Location: EAO Office, Hilo
Bhavana Lalchand, National Central University, Taiwan
Upcoming Seminar: April 10th, 2018, 2pm (HST)
Determining the systematic errors in fits of dust thermal emission: the role of laboratory data in upcoming models
Location: EAO Office, Hilo
Lapo Fanciullo, ASIAA, Taiwan
The study of cosmic dust often involves interpreting observations using dust models, for which a central parameter is the dust far-infrared opacity κ. However, we are learning from both astronomical observations and laboratory tests on dust analogues that our models of dust opacity — one of the most popular being a power law, κ ∝ λ–β (usually with β ~ 2) — are too simplistic. Two facts in particular emerge:
- For most candidate dust materials the opacity κ(λ) does not follow a power law: its slope decreases beyond a certain wavelength (typically 400–700 μm);
- The optical properties of materials often depend on temperature as well; for instance opacity often increases with T.
We are working on the laboratory-measured opacities of several candidate dust materials to parametrize them as functions of λ and T. This parametrization will be the first step in building a more physically realistic and flexible dust model, which will allow to find potential systematics in previous fit results.
Where and How:
EAO seminars are (usually) held in the second floor conference room at the East Asia Observatory, 660 N. A’ohoku Place, Hilo, Hawaii. Please note that access to EAO is possible only through the main entrance (through the side doors facing Subaru).
If you would like to view the seminar via Polycom, please contact the helpdesk well in advance of the talk and we will make sure it’s switched on!
Our Polycom contact details are available on request.
The EAO phone number is: (808) 961-3756. A full list of past seminar speakers can be found here for 2018, here for 2017, here for 2016 and here for 2015. These pages also contain links to PDF copies of the seminar slides, where available.
To join the Seminar e-mail list:
EAO Seminars are sent out via firstname.lastname@example.org. If you wish to join this seminar list please send an e-mail to email@example.com.