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Burçin Mutlu-Pakdil Speaks at 2018 TED Conference in Vancouver, BC

Steward Postdoc and TED Fellow Dr. Burçin Mutlu-Pakdil presented her research as one of the selected speakers at the 2018 TED Conference in Vancouver, British Columbia. In her talk, she shared her exciting finding – the discovery of an extremely rare galaxy. This galaxy is the first example of an elliptical galaxy with two nearly round rings. Its nearly round central body closely follows a de Vaucouleurs R1/4-law surface brightness profile. A stellar population analysis of multi-waveband data (near-UV, infrared and optical) suggests different formation histories for the rings. While a recent accretion event, probably from a gas-rich dwarf galaxy, is the most plausible formation mechanism for the outer ring, more data is needed to recover the formation history of the inner ring. The origin of the inner ring is especially puzzling because there is currently no known mechanism that can explain the existence of this second ring in such a peculiar galaxy. These results were presented in her paper published by the Monthly Notices of the Royal Astronomical Society and can be read HERE. Her TED talk is now available HERE.

CBS "Space Watch" Video about GMT

CBS has published a 40 second segment about the building of the Giant Magellan Telescope in Chile (you have to put up with an advertisement). The sequence includes video of the mirror and mirror polishing, of the rotating oven at the Richard F. Caris Mirror Lab, as well as computer animations of CAD-like drawings of the telescope.

Steward's Imaging Technology Laboratory Delivers More Than 100 CCDs For The LSST Telescope

The University of Arizona has completed delivery of over 100 science-grade 4kx4k Charge-Coupled Device (CCD) image sensors for the Large Synoptic Survey Telescope (LSST). This work was performed at the UA Imaging Technology Laboratory (ITL). The sensors are among the most demanding ever produced in terms of quantum efficiency, readout speed, and surface flatness. ITL had previously delivered a set of 4kx2k wavefront sensors which will also be used in the LSST focal plane. Both sensors were designed by Semiconductor Technology Associates, Inc. in California. The Imaging Technology Laboratory is directed by Dr. Michael Lesser and is a research group within the University's Steward Observatory. Financial support for LSST comes from the National Science Foundation (NSF) through Cooperative Agreement No. 1258333, the Department of Energy (DOE) Office of Science under Contract No. DE-AC02-76SF00515, and private funding raised by the LSST Corporation. The NSF-funded LSST Project Office for construction was established as an operating center under management of the Association of Universities for Research in Astronomy (AURA). The DOE-funded effort to build the LSST camera is managed by the SLAC National Accelerator Laboratory (SLAC).

Michael Lesser of ITL has graciously sent us three photos and explanations. 

Photo 1 (Click to enlarge) 

This photo shows the four liquid nitrogen cooled Dewars used for testing the science and wavefront sensors at ITL.  During the project’s production phases, two sensors were often characterized each day, with the other dewars warming up or cooling down for subsequent testing.

Photo 2 (click to enlarge)

An LSST STA4400 2kx4k Curvature Wavefront CCD sensor on its aluminum test tower.  The silicon CCD is mounted on a gold-plated silicon-aluminum alloy chosen for its excellent thermal characteristics. These sensors will be located in the “LSST corner rafts” and are used to provide feedback to the telescope’s active optics system.

Photo 3 (click to enlarge)

An LSST STA3800 4kxk4k CCD sensor undergoing final metrology inspection on a VIEW Summit 600 Coordinate Measuring Machine.  The surface flatness of the sensors is typically less than 4 microns peak-to-valley. Every sensor produced underwent electro-optical and metrological characterization before delivery.


GMT has Shared a GMT-Site Drone Video

The GMTO has shared a 360 degree panorama taken by a drone. You can pan, zoom in and out, and start the video using the controls. The GMT is a partnership of (alphabetically) Arizona State University, Astronomy Australia Limited, Australian National University, Carnegie Observatories, The São Paulo Research Foundation – FAPESP, Harvard University, Korea Astronomy and Space Science Institute (KASI), the Smithsonian Institution, Texas A&M University, The Department of Astronomy of the University of Texas at Austin, The University of Arizona, and the University of Chicago. GMTO recently entered into an agreement with the NSF, NOAO, and the Thirty Meter Telescope International Observatory to seek federal funding and to give access to non-partner-institution astronomers.


Protoplanetary Disks in Orion

A group of UA scientists ( Steward Professor Josh Eisner, Associate Astronomer Serena Kim, Steward Postdocs Nick Ballering and  Min Fang, Steward Grad Student Ryan Boyden, and LPL Associate Professor Ilaria Pascucci) and their collaborators have used the ALMA telescope to image protoplanetary disks in the Orion star forming region. You can read the press release HERE. Josh Eisner has kindly written a couple of paragraphs that you can read below.

"Protoplanetary disks are the birth-sites of planets.  A team of scientists led by the University of Arizona has imaged a cluster of protoplanetary disks in the Orion Nebula and discovered that they are smaller than those previously studied in closer, less-dense regions. These disks are similar in size to theoretical models for the protosolar nebula.

Given that our own solar system (and most systems in the Galaxy) likely formed in an Orion-like environment, this finding suggests that we may be observing typical planetary systems in the making.

 The team's findings have been published in the Astrophysical Journal. The scientists used the largest telescope in the world, an interferometric array of radio telescopes in Chile called ALMA, to observe about 110 protoplanetary disks in the Orion Nebula in the deepest survey of the region yet.  Based on the images, the team was able to calculate the masses and sizes of protoplanetary disks in the Orion Nebula.  Their survey showed that Orion, with its massive stars and high stellar density, has disks that look significantly different than those in nearby, but less-dense regions.  To confirm the effects of environment on the star and planet formation process, U of A scientists are pursuing grant funding and telescope time to study more regions of dense, high-mass star formation."


UA Undergrad Attacks Problem of Massive Star Formation in Molecular Clouds

Recent UA graduate Jenny Calahan (BS in Astronomy and Physics 2018), in collaboration with faculty Member Dr Yancy Shirly, has used Arizona Radio Observatory data to identify the possible birth places of stars weighing more than 8 Solar Masses.  As well as Calahan (who is about to start graduate school at U Michigan) and Professor Shirley, Stewardites include Dr Brian Svoboda (PhD 2018,  now a Jansky Fellow) , Elizabeth Ivanov, Jonathan Schmid, Anna Pulley, Jennifer Lautenbach, Nicole Zawadzki, Christopher Bullivant, Claire Cook, Laurin Gray, Andrew Henrici, Massimo Pascale, Carter Bosse, Quadry Chance, Sarah Choi, Marina Dunn, Ramon Jaime-Frias, Ian Kearsley, Joseph Kelledy, Collin Lewin, Qasim Mahmood, Scott McKinley, Adriana Mitchell, and Daniel Robinson. You can read the press release HERE. and a preprint of the journal paper HERE.