8 July 2014 First light results from the Hermes spectrograph at the AAT
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Abstract
The High Efficiency and Resolution Multi Element Spectrograph, HERMES is an facility-class optical spectrograph for the AAT. It is designed primarily for Galactic Archeology [21], the first major attempt to create a detailed understanding of galaxy formation and evolution by studying the history of our own galaxy, the Milky Way. The goal of the GALAH survey is to reconstruct the mass assembly history of the of the Milky Way, through a detailed spatially tagged abundance study of one million stars. The spectrograph is based at the Anglo Australian Telescope (AAT) and is fed by the existing 2dF robotic fiber positioning system. The spectrograph uses VPH-gratings to achieve a spectral resolving power of 28,000 in standard mode and also provides a high-resolution mode ranging between 40,000 to 50,000 using a slit mask. The GALAH survey requires a SNR greater than 100 for a star brightness of V=14. The total spectral coverage of the four channels is about 100nm between 370 and 1000nm for up to 392 simultaneous targets within the 2 degree field of view. Hermes has been commissioned over 3 runs, during bright time in October, November and December 2013, in parallel with the beginning of the GALAH Pilot survey starting in November 2013. In this paper we present the first-light results from the commissioning run and the beginning of the GALAH Survey, including performance results such as throughput and resolution, as well as instrument reliability. We compare the abundance calculations from the pilot survey to those in the literature.
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Andrew Sheinis, Andrew Sheinis, Sam Barden, Sam Barden, Michael Birchall, Michael Birchall, Daniela Carollo, Daniela Carollo, Joss Bland-Hawthorn, Joss Bland-Hawthorn, Jurek Brzeski, Jurek Brzeski, Scott Case, Scott Case, Russell Cannon, Russell Cannon, Vladimir Churilov, Vladimir Churilov, Warrick Couch, Warrick Couch, Robert Dean, Robert Dean, Gayandhi De Silva, Gayandhi De Silva, Valentina D'Orazi, Valentina D'Orazi, Tony Farrell, Tony Farrell, Kristin Fiegert, Kristin Fiegert, Kenneth Freeman, Kenneth Freeman, Gabriella Frost, Gabriella Frost, Luke Gers, Luke Gers, Michael Goodwin, Michael Goodwin, Doug Gray, Doug Gray, Ron Heald, Ron Heald, Jeroen Heijmans, Jeroen Heijmans, Damien Jones, Damien Jones, Stephan Keller, Stephan Keller, Urs Klauser, Urs Klauser, Yuriy Kondrat, Yuriy Kondrat, Jon Lawrence, Jon Lawrence, Steve Lee, Steve Lee, Slavko Mali, Slavko Mali, Sarah Martell, Sarah Martell, Darren Mathews, Darren Mathews, Don Mayfield, Don Mayfield, Stan Miziarski, Stan Miziarski, Rolf Muller, Rolf Muller, Naveen Pai, Naveen Pai, Robert Patterson, Robert Patterson, Ed Penny, Ed Penny, David Orr, David Orr, Keith Shortridge, Keith Shortridge, Jeffrey Simpson, Jeffrey Simpson, Scott Smedley, Scott Smedley, Greg Smith, Greg Smith, Darren Stafford, Darren Stafford, Nicholas Staszak, Nicholas Staszak, Minh Vuong, Minh Vuong, Lewis Waller, Lewis Waller, Elizabeth Wylie de Boer, Elizabeth Wylie de Boer, Pascal Xavier, Pascal Xavier, Jessica Zheng, Jessica Zheng, Ross Zhelem, Ross Zhelem, Daniel Zucker, Daniel Zucker, } "First light results from the Hermes spectrograph at the AAT", Proc. SPIE 9147, Ground-based and Airborne Instrumentation for Astronomy V, 91470Y (8 July 2014); doi: 10.1117/12.2055595; https://doi.org/10.1117/12.2055595
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