Seminars

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: May 1st, 2019, 2pm (HST)

The dynamics of star-forming regions as probed with far-infrared and submillimeter polarimetry

Location: EAO Office, Hilo

Simon Coude, SOFIA-USRA

The exact roles of magnetism and turbulence at different stages of star formation remain poorly understood even today, and it is still not clear from observations in which regime, if any, magnetic fields can effectively counteract gravitational collapse. Nevertheless, the latest generation of polarimeters at far-infrared and submillimeter wavelengths has shown the ubiquity of magnetic fields from the scale of giant molecular clouds to that of protostellar cores. During this talk, I will discuss how our current polarimetric capabilities provide a unique window into the dynamics of star-forming regions when used in combination with spectroscopic data. Specifically, I will present published and on-going results from the BISTRO survey at the James Clerk Maxwell Telescope (JCMT), as well as multi-wavelengths observations using the HAWC+ camera aboard the Stratospheric Observatory for Infrared Astronomy (SOFIA). The BISTRO survey in particular is showing that several star-forming regions are only slightly supercritical, with in some cases magnetic fields nearly dominated by their turbulent component. Finally, multi-wavelength polarimetric observations offer a unique opportunity to measure the alignment efficiency of dust grains with interstellar magnetic fields in a variety of extreme environments. These provide a valuable test for grain alignment theories, such as Radiative Alignment Torques (RATs), and will prove particularly helpful in characterizing the range of conditions in which they are most efficient.

Upcoming Seminar: May 3rd, 2019, 2pm (HST)

Dust and Molecular gas in Early-Type Galaxies

Location: EAO Office, Hilo

Anne Sansom, University of Central Lancashire

Elliptical and lenticular (E/SO) galaxies, collectively known as ETGs, are traditionally thought to be red and dead. However, there is evidence of some cool gas and dust, sometimes seen in absorption as dust lanes in optical images. For late-type galaxies there is a link between the presence of molecular gas and dust, with dust arising mainly from red giant stars and molecular gas and dust forming the sites of the next generation of stars. However, it is less clear how the dust and gas arrived in ETGs. Complete samples are needed to get a clearer picture of the cool ISM properties in E/S0 galaxies. Large surveys with the Herschel Space Observatory gave us the data to look at complete samples of galaxies. We combined data from two such surveys with multi-waveband data from the GAMA survey to uncover the dust properties in ETGs as a function of galaxy characteristics. We show the properties of these dusty ETGs in this talk. Recent follow-on observations with ALMA, for a small sub-sample of these dusty ETGs, will also be presented in this talk, highlighting their molecular gas content and the variety of cool interstellar media found in ETGs.

Upcoming Seminar: June 4th, 2019, 2pm (HST)

TBA

Location: EAO Office, Hilo

Kate Pattle, National Tsing Hua University


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).

We stream all of our seminars through the Zoom video conferencing application. If you would like to view the seminar via Zoom, links are sent out on the seminar mailing list (see below) or you may contact the helpdesk in advance of the talk and we will make sure that the option is available to you.

A full list of past seminar speakers can be found below for the current and previous years. These pages also contain links to PDF copies of the seminar slides, video recordings of the seminars, and other materials, where available.

To join the Seminar e-mail list:

EAO Seminars are sent out via eao_seminar@eao.hawaii.edu. If you wish to join this seminar list please send an e-mail to eao_seminar-join@eao.hawaii.edu.

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