Colloquia Schedule Spring 2015

Colloquia are on Tuesdays (unless otherwise indicated) at 3:30 pm in RLM 15.216B

Jan. 20

Tinsley Visiting Scholar: Planetary Group

"Habitability of Planets Orbiting M Dwarfs"

abstract

Rory Barnes

University of Washington

host: Mike Endl

Jan. 27

"Title: TBA"

abstract

David W. Hogg

New York University

host: Shardha Jogee

Feb. 3

"Title: TBA"

abstract

Speaker: TBD

Affiliation: TBD

host: TBA

Feb. 10

"Title: TBA"

abstract

Speaker: TBD

Affiliation: TBD

host: TBA

Feb. 17

"Title: TBA"

abstract

Speaker: TBD

Affiliation: TBD

host: TBA

Feb. 24

"Title: TBA"

abstract

Speaker: TBD

Affiliation: TBD

host: TBA

Mar. 3

"Title: TBA"

abstract

Speaker: TBD

Affiliation: TBD

host: TBA

Mar. 10

"Title: TBA"

abstract

Sera Markoff

University of Amsterdam

host: Pawan Kumar

Mar. 17

Spring Break: March 16 - 20: no Colloquium being held this week.

Mar. 24

"MOSFIRE, the Multi-Object Spectrometer for Infrared Exploration at Keck Observatory"

MOSFIRE is a powerful and unique near-infrared (0.9-2.4 microns) instrument for the Keck 1 telescope on Mauna Kea. MOSFIRE is both a camera and a spectrograph. The camera can image a field of view of 6.1 x 6.1 arcminutes with 0.18 arcseconds per pixel sampling. Up to 46 objects in the central 6 x 4 arcminute field can then be isolated using a cryogenic configurable slitmask unit (CSU) located inside the vacuum chamber. When a mirror is switched to a diffraction grating, the spectra of all 46 objects are recorded simultaneously. For a slit width of 0.7 arcseconds (2.9 pixels), MOSFIRE achieves a resolving power of R~3,500. Observations are possible in the Y, J, H or K bands using only two grating settings, and a single HgCdTe 2K x 2K detector. Because of the cryogenic CSU, slit masks can be reconfigured under computer control in about six minutes. This unique mechanism completely eliminates the time and risk associated with a thermal cycle of the instrument to room temperature in order to exchange batches of previously-milled metal masks. Built by a consortium of UCLA, Caltech, UCSC and WMKO, together with industrial partners, MOSFIRE was a challenging instrument for many reasons. The project took almost 8 years to complete. I will describe how the most important problems were solved, and I will illustrate MOSFIRE's excellent on-sky performance. MOSFIRE has been in regular use by the community since February 2013.

close

Ian McLean

University of California, Los Angeles

host: Gregory Mace

Mar. 31

Tinsley Visiting Scholar: Stars Group

"Title: TBA"

abstract

Raffaele Gratton

INAF - Istituto Nazionale di Astrofisica, Osservatorio Astronomico di Padova, Italy

host: Chris Sneden

Apr. 7

"Title: TBA"

abstract

Speaker: TBD

Affiliation: TBD

host: TBA

Apr. 14

"Title: TBA"

abstract

Adam Leroy

Ohio State University

host: Neal Evans

Apr. 21

"Title: TBA"

abstract

Catherine Espaillat

Boston University

host: Adam Kraus

Apr. 28

"Title: TBA"

abstract

Speaker: TBD

Affiliation: TBD

host: TBA

May. 5

"Title: TBA"

abstract

Lars Hernquist

Harvard-Smithsonian Center for Astrophysics

host: Volker Bromm

Visitors to the Department of Astronomy can find detailed information and maps on our Visiting Austin Page.

Please report omissions/corrections to: G. Orris at argus@astro.as.utexas.edu.

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