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4 Abril 2013: The repair of the Blanco telescope’s f/8 secondary has been completed, and the figure of the repaired optic (shown at right) matches the measurement after it was refigured in 1993 (at left). The small circle in the center of the 2013 image represents the diameter of the repair. The repaired mirror will be returned to Chile, where the repairs to the mirror cell are underway. Initial re-integration of the cell on the telescope is scheduled for late June, with first light with the repaired mirror planned for August.

28 Marzo 2013: Do all globular clusters within a galaxy share a common history? Multiple histories could indicate that different processes drive a galaxy's fundamental development at different times. Juan Carlos Forte (Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina) and colleagues used the Gemini Multi-Object Spectrograph (GMOS) to study over 500 globular clusters in the galaxy M87. Their observations indeed point to such complexity, revealing multiple episodes of star formation. Globular clusters indirectly reveal the star formation history of their host galaxy, and one of their fundamental properties is the metallicity, or abundance of elements more massive than helium. Many globular clusters (GCs) are old, even to the point of challenging other measurements of the age of the universe, but detailed observations can show structure in the distribution of their observed colors. The outstanding question is whether this is evidence of real non-uniformity in the underlying history and metallicity distribution or merely …

14 Marzo 2013: “Do you think space aliens are real?” Gemini Observatory’s Director Markus Kissler-Patig asks a class of students. His question is part of Gemini’s Journey through the Universe (JttU) program where dozens of scientists and educators share their work and, most importantly, inspire young Hawai‘i Island students. “I think the students in our classrooms today are the ones who will answer the big questions we are asking, such as what, and possibly who, is out there on all of those planets we are only starting to discover now,” says Kissler-Patig. Now in its ninth year, JttU wraps up its annual “Journey Week” on March 15th. During this week Gemini staff joined over 50 other scientists, researchers, and educators in classrooms across East Hawai‘i (see photos in this feature). “The goal of this program is to inspire our keiki,” says the program’s manager and Gemini’s education and outreach leader Janice Harvey. “Even …

28 Febrero 2013: The March 2013 NOAO Newsletter is online and ready to download. This issue includes information pertaining to the 2013B Call for Proposals, which are due March 28, 2013. On the Cover This cover presents a collage of the past, present, and future of the Cerro Tololo Inter-American Observatory in Chile in celebration of the observatory’s 50th anniversary.

14 Febrero 2013: Gemini Near-Infrared Spectrograph (GNIRS) observations lead to surprising results on the nature of Type Ia supernovae (SNe Ia). Time-series near-infrared spectra of SN 2011fe hint that more SNe Ia harbor unprocessed carbon than previously believed, and what we thought was the main driver of the luminosity-decline rate Phillips relation may not be correct. Understanding the true nature of Type Ia supernovae (SNe Ia) is a linchpin of contemporary cosmology. Specifically, these explosions are critical for tracking the expansion history and acceleration of our universe. Commonly called “dark energy,” the discovery of this universal acceleration was the basis for the 2011 Nobel Prize in Physics. Now, researchers using the Gemini Near-Infrared Spectrograph (GNIRS), at the Gemini North telescope on Hawaii’s Mauna Kea, have taken a major leap forward in understanding SNe Ia with the first detection of unprocessed carbon in near-infrared spectra of a normal Type Ia supernova. The supernova (geminiann13004a), …

13 Febrero 2013: On Tuesday, February 12, 2013 Australian High School Senior Ryan Soares had stars in his eyes during a ceremony celebrating his winning selection for the 2012 Australian Gemini Schools Imaging contest. In describing his entry, which features a group of three beautiful galaxies, he said that he chose the grouping because the galaxies, “…had never been imaged as a group by a large professional telescope such as Gemini South.” Ryan was also “thinking big” with this project, by suggesting that the telescope should take not one but two images and “stitch” them together to capture the panorama of the three galaxies. “I thought that if they let me do this, in future other students could propose other big, exciting regions of sky to study,” he said. This approach was challenging due to the limited time available (about one hour total) for the observations. Each of the two images required three …

11 Febrero 2013: Miss Tohono O’odham 2013 and her court visited the NOAO booth at the 75th Annual Tohono O’odham Rodeo & Fair, Feb 1-3. Shown in the picture: (L2R) Katy Garmany, Lori Allen, 1st Attendant Jaylene Wood, 2nd Attendant Raven Johnson, and Miss Tohono O’odham Nation Hon’mana Sekteoma. Jaylene Wood sang an O’odham traditional song describing an eagle soaring over Kitt Peak. See an article about the Fair in the March NOAO Newsletter.

1 Febrero 2013: Using high signal-to-noise optical spectroscopy from Gemini, and Hubble Space Telescope imaging of three intermediate redshift galaxy clusters, Gemini astronomers Inger Jørgensen and Kristin Chiboucas have shed new light on galaxy evolution. The team’s paper, accepted for publication in The Astronomical Journal, shows that the mass to light ratios of the galaxies indicate that low-mass galaxies have experienced more recent star formation than high-mass galaxies. Both the mass-to-light ratios and the Balmer lines (hydrogen lines) can be used to estimate the ages of the galaxies. However, the Balmer lines indicate that all of the galaxies are very old, leading to a contradiction between the two methods of age determination. Furthermore, the metal lines (or metallicity, an indication of the presence of elements heavier than hydrogen and helium which are formed in previous generations of stars) show that there are metallicity differences when comparing the clusters. This is in contradiction with …

3 Enero 2013: The Gemini Observatory Board of Directors opens 2013 with new leadership and a number of membership changes. The changes reflect regular term expirations as well as the departure of the United Kingdom from the partnership and subsequent adjustments to partner shares. The Board’s new Chair, Michael Balogh (University of Waterloo) replaces Larry Ramsey (Pennsylvania State University) who provided forward-looking leadership and sound management skills during the previous three years, a period of significant change and transition at Gemini. Balogh is joined by the newly appointed Vice Chair, Karl Gebhardt (University of Texas Austin). Together, Balogh and Gebhardt will lead the Board in guiding the Observatory through the next phase. Following the UK departure, the board composition has readjusted to reflect the new partner shares. The two positions held by René Walterbos (New Mexico State University) and You-Hua Chu (University of Illinois), both reaching the end of their term, have been …

7 Diciembre 2012: Despite a challenging global economic climate, and often drastic funding cuts in government-funded science and technology research, a recent milestone for the Gemini Observatory sees the observatory moving forward until the end of this decade with its strong international partnership intact. However, a potential challenge lies ahead with funding uncertainty in Australia after 2015 says Gemini’s newly appointed Director Dr. Markus Kissler-Patig. “Although this might present an obstacle, it’s one with many possible solutions even if Australia cannot remain a full partner in Gemini,” said Kissler-Patig. It is in this environment that in September 2012 the Gemini Board held a retreat to discuss among other items the future of the Gemini partnership in the years 2016 to 2018, beyond the current international agreement - which extends through the end of 2015. Following this retreat, Gemini’s regularly-scheduled Board meeting, held in La Serena, Chile from November 14 to 16 resulted in …

30 Noviembre 2012: Using joint observations from Gemini South, the European Southern Observatory’s Very Large Telescope (ESO/VLT), and the Canada-France-Hawaii Telescope (CFHT), a team of astronomers has discovered a spectacular and very rare phenomenon in galaxies. It is interpreted as a light echo from an earlier, very active, quasar phase that has since shut down. Because of these objects' unique characteristics, they appear green in some datasets giving them the colorful moniker “green-bean galaxies.” As described in the ESO press release today (December 5, 2012), Gemini astronomer Mischa Schirmer first identified an example of this odd class of object in CFHT imaging data –– a distant galaxy denoted J224024.1−092748 or J2240 (geminiann12015a). After investigating the new object with the VLT, and confirming it with Gemini South, Schirmer and his team went on to observe several additional candidates with the Gemini telescope. These spectroscopic observations confirmed that another 16 candidates share the same characteristics …

19 Noviembre 2012: A group of British astronomers, led by Neale P. Gibson of the University of Oxford, used the Gemini Multi-Object Spectrograph (GMOS) to probe the atmosphere of a transiting extrasolar planet identified as WASP-29b. Previously, measurements of this sort were only possible from space, due to distortions from the Earth’s atmosphere. Now, thanks to advances in instrumentation and data processing, it is possible to perform these difficult observations using ground-based telescopes like Gemini. ESO’s Very Large Telescope was the first to attempt such observations and this work by Gibson et al. demonstrates the same extraordinary capability, and required instrumental stability, with GMOS on Gemini. The study of exoplanets is a rapidly advancing discipline with more than 800 planets detected beyond our solar system so far. The first of these were detected in 1988 and about 600 have been found in just the last decade. Another 2000 are expected to be revealed …

2 Noviembre 2012: Hawaii’s Mauna Kea and Chile’s Cerro Pachón host some of the world’s most powerful astronomical observatories - with capabilities found nowhere else. Now, with a new sharing agreement inked between the 8-meter Gemini and Subaru telescopes on these sites, astronomers from around the world have even more avenues to explore and understand our universe. The new time exchange agreement between Gemini and Subaru makes the entire suite of instrumentation available at each observatory open to any astronomer in the countries of the U.S., Japan, Canada, Australia, Brazil, Argentina, and Chile. “Opening up our major research infrastructures to each other’s community sends a strong signal,” said Gemini Observatory Director Markus Kissler-Patig. “In a world in which communication is made easy, the future of science lies in the concept of crowdsourcing, where we share and distribute our brainpower and creativity globally,” said Kissler-Patig. “Both the Subaru and Gemini communities will profit immensely …

7 Septiembre 2012: Exploding stars (supernovae) offer the most precise measurements of large cosmic distances. Of these, when observed at near-infrared wavelengths, type Ia supernovae provide the greatest precision as “standard candles” for measuring cosmological distances. Observations of type Ia supernovae at optical wavelengths are frequently used for this purpose and are the basis for the research leading to the 2011 Nobel Prize in Physics. These supernovae have intrinsically variable luminosities at optical wavelengths, however, so the luminosities must be standardized empirically. For example, this can be accomplished by using the relationship that supernovae which fade away more slowly are brighter. Optical light also suffers from the complication of attenuation by dust anywhere along the line of sight, from the supernova’s host galaxy to our vantage point in the Milky Way. To circumvent these difficulties, Rob Barone-Nugent (University of Melbourne, Australia) and colleagues show in a recent publication in the Monthly Notices of …

4 Septiembre 2012: From the 27th to the 31st of August, Gemini Observatory held their annual “Viaje al Universo”. The week long program brought astronomy into the classroom, with a wide variety of educational talks and workshops throughout schools in the Elqui Valley, La Serena and Coquimbo. The schools that participated this year were: Colegio Jerónimo Godoy from Pisco Elqui, Liceo Mistraliano from Paihuano, Colegio Claudio Arrau and Cardenal Caro from Coquimbo; Colegio San José, Saint Mary El Milagro, Christ School, Colegio Alemán, Sagrados Corazones and José Manuel Balmaceda from La Serena. With guidance from Gemini, the math and physics teachers and school principals worked over the course of a year on the proposal for this program. In addition to visiting the schools, experts from the US and Santiago led engaging rocket launching workshops throughout the week. Two talks were held on Wednesday the 29th at the Intendencia Regional. The first by Roderick …

28 Agosto 2012: A research team led by University of Texas at Austin astronomy graduate student J.J. Hermes used the Gemini North telescope on Mauna Kea Hawai‘i to observe two white dwarf stars in a close gravitational embrace. Based on this work with Gemini and several other telescopes, Hermes and his team confirmed that the pair’s grip on each other is tightening very quickly. So quickly in fact, that the change in the pair’s period (slightly less than 13 minutes) is measurable (even over the tenure of a graduate student!) These measurements help confirm another ramification of Einstein’s General Theory of Relativity, which holds that the energy the pair loses in the shortened period is carried away in gravitational waves. The team’s paper, to be published in The Astrophysical Journal Letters, finds that the pair’s period loses about 0.25 milliseconds per year, which is almost exactly what the General Theory of Relativity predicts. …

28 Agosto 2012: The September 2012 NOAO Newsletter is online and ready to download. On the Cover May's Solar Eclipse and June's Venus Transit silhouette the telescopes on Kitt Peak.

18 Julio 2012: The National Science Board has approved the LSST project, allowing the NSF Director to put the top ranked ground based initiative of the 2010 Decadal Survey in a future budget. See the NSF press release 12-137. NOAO is a founding member of the LSST collaboration working on the site, enclosure, and telescope that will be located at Cerro Pachón in Chile (shown above).

6 Julio 2012: High-resolution, mid-infrared observations at Gemini North and South have revealed a wide range of morphologies for low-luminosity active galactic nuclei (AGN). While the data present a broad characterization of these objects' properties in this spectral region, they also present an interesting puzzle to ponder. Active galactic nuclei (AGN), the supermassive black holes that feed on gas, dust, and stars at the centers of galaxies, spend most of their existence in a near dormant state. Until recently, astronomers had observed only a handful of low-luminosity AGN in the infrared at high resolution. Therefore, we didn't have a good, general overview of their properties in this potentially revealing spectral region. Our observations of 22 low-luminosity AGN, taken with both of Gemini's mid-infrared instruments (Michelle and T-ReCS), have changed this situation. The images reveal a wide range of morphologies, from galaxies dominated by a central, compact source (much like images of higher-luminosity Seyferts …

26 Junio 2012: This image was obtained with the wide-field view of the Mosaic II camera on the Blanco 4-meter telescope at Cerro Tololo Interamerican Observatory on January 12th and February 7th, 2012. An array of dark Bok globules, known as Thackeray’s Globules, can be seen in silhouette against the emission nebula IC 2944 in the constellation Centaurus. The image was generated with observations in the B (blue), I (orange) and Hydrogen-Alpha (yellow) filters. In this image, north is up, and east is to the left. This is one of the last observations completed with the Mosaic II camera before it was decommissioned.