Announcement: Gemini Observatory

26 Febrero 2003: The Gemini Near-infrared Imager (NIRI) has been working reliably and delivering excellent images at wavelengths between 1 and 5 microns. In one NIRI program, very sharp images (0.35 arcsecs FWHM without adaptive optics correction) of 11 different sub-regions of the nearby spiral galaxy M33 were collected over a period of two nights in September 2002. The infrared NIRI images probe through the intervening dust in M33 and allow us a clear view of the many evolved giant stars in this galaxy. In the inset infrared (IR) image, 22,000 individual giant stars were detected and measured. The image on the left shows what this same field looks like at visible wavelengths with a seeing of 0.75 arcsecs (FWHM). The dust seen in the optical image all but disappears in the NIRI IR image (a composite of 1.6 and 2.1 micron images). Taking a census of the stars in other galaxies is …

12 Febrero 2003: The tightest orbiting brown dwarf companion ever seen has been discovered orbiting the low mass star LHS 2397a, using adaptive optics on Gemini North. The faint companion completes its orbit around the parent star at a distance of about 3 astronomical units (AUs) every 20 years. The images above show LHS 2397a in four bandpasses. The first image on the left is an optical image in the I Band obtained with the Hubble Space Telescope (HST) on April 12, 1997. The brown dwarf is seen as the very faint object at nine o'clock and is very difficult to detect in this unenhanced image. The next three images were obtained using adaptive optics in the near infrared (J, H and K' bands) on Gemini North five years later (February 7, 2002). The Gemini images use a Fourier filter to enhance the visibility of the companion, hence the presence of the companion …

28 Enero 2003: Today, in a live videoconference connecting Hawai`i with Chile, the six teachers selected to participate in the Gemini Observatory StarTeachers Exchange Program were officially announced. During the event, the 3 teachers from each location met and shared some of their ideas for the exchange using the same advanced high-speed internet videoconferencing technology that they will use to present lessons to their students back home during the exchange. The Hawai`i teachers are scheduled to visit their colleagues in Chile for two weeks in March and the Chilean teachers will make a reciprocal visit to Hawai`i in October 2003. The three Big Island StarTeachers selected are Kristen Luning, Chairperson of the Math Department at Keaau High School; Alicia Hui, a fifth grade teacher at Haili Christian School; and Christine Copes, a math and Resource Teacher at Waiakea Elementary School. The three Chilean teachers are Carmen Luz Briones, Viviana Calderon and Jenny Opazo. …

21 Enero 2003: Violent bush fires ravaging Canberra destroyed most of the facilities at the Stromlo Observatory. Fortunately there were no additional human injuries or casualties. More details on the loss of Gemini's Near-Infrared Integral Field Spectrograph can be found at the links below. Astronomy projects in ruins as observatory obliterated Aussie Fires Destroy Mount Stromlo Observatory Australian fire felt in Hilo Gemini Near-Infrared Integral-Field Spectrograph (NIFS): Destroyed by Bushfire January 2003 Historic Australian observatory gutted The Mount Stromlo Fires: A Major Heritage Loss For Australian Astronomy Mount Stromlo Observatory Destroyed by Fire Pictures of the aftermath of the fire of Saturday, 18 January 2003, at Mount Stromlo Observatory

9 Enero 2003: Gemini South Assistant Astronomer Dr. Michael Ledlow has helped confirm the existence of a giant, subatomic particle jet streaming from a spiral galaxy similar to the Milky Way. Though long known to be associated with elliptical and merging galaxies, the discovery of such jets streaming from a spiral galaxy raises significant questions about current theories on jet production. The discovery was made possible by the combination of radio, optical and infrared observations. The findings were reported at the American Astronomical Society's meeting in Seattle. Dr. Ledlow's infrared work at Gemini South was instrumental in complementing research by the team leader, Dr. William Keel with the University of Alabama, and Dr. Frazer Owen with the National Radio Astronomy Observatory. The galaxy, known as 0313-192, first came to the attention of Dr. Owen more than 20 years ago during a galaxy survey he conducted using the Very Large Array (VLA). Gemini South's …

18 Diciembre 2002: The Gemini Multi-Object Spectrograph (GMOS) at Gemini South Gemini South took delivery of GMOS-S in November 2002 and is preparing to install it on the telescope for commissioning very early in 2003. It is anticipated that GMOS-S will be available during semester 2003B in both imaging and several spectroscopic modes. Like its twin that began observations in 2001 on Gemini North, GMOS-S was built as a collaboration between Canada (HIA), and the UK (Astronomical Technology Centre at ROE and University of Durham). The GMOS detector system was provided by the US (National Optical Astronomy Observatory). The two GMOSs are the primary instruments for optical (0.36-1.10 µm) slit/multi-slit/integral field spectroscopy as well as imaging (5.5 arcmin field of view) on the Gemini telescopes. Michelle at Gemini North The facility mid-infrared imager and spectrometer Michelle arrived at Gemini North in the first week of December, however, Michelle did not arrive from the …

2 Diciembre 2002: The Large Magellanic Cloud, a small satellite galaxy at a distance of about 50,000 parsecs, is a prime target in which to probe the chemical evolution of stars. Because this galaxy has a different star formation history than our own galaxy, the properties of its stars are different. Variations in galaxy evolution can lead to differences in chemical composition, which result in stars that noticeably differ in the later phases of their evolution. Measuring and understanding these chemical differences help unravel the physics of the complexes processes of nuclear burning and mixing that take place in the red giant and later phases. Within a given stellar population in a galaxy, chemical evolution is driven primarily by stellar nucleosynthesis, with the dispersal of the processed material back into the galactic interstellar medium (ISM). This heavy-element enrichment over time depends on such processes as star formation history, internal stellar evolution and nucleosynthesis …

6 Noviembre 2002: Approximately 110 astronomers will meet in Kona during November 3-8, 2002, to discuss the nucleus of our Milky Way. Called "The Central 300 Parsecs," the conference has been locally organized mainly by Gemini-North staff and is sponsored by Gemini and several other observatories on Mauna Kea. Gravity and frictional forces inevitably cause the centers of galaxies to acquire mass densities much higher than that of the outer regions. Even a normal-looking spiral galaxy such as ours might be expected to contain almost the entire galactic astronomical zoo: stars of all masses and evolutionary states, white dwarfs, nebulae, dust clouds, neutron stars, and even black holes - all packed together in a tight swarm. The nucleus of our galaxy is already known to contain a wide variety of astrophysical phenomena. Although it is 25,000 light years away, it is by far both the nearest and brightest galactic nucleus. Thus it can …

6 Noviembre 2002: Perhaps flung from the Galactic Center's innermost cluster of hot stars some 20,000 years ago, the massive star IRS-8 is moving at supersonic speed through high density gas. Located 8000 parsecs from the Sun in the direction of Sagittarius, the nucleus of the Milky Way is host to numerous high energy phenomena including a supermassive black hole of approximately three million solar masses which defines the dynamic center of our galaxy. The nucleus also contains a number of young clusters of recently formed hot and massive stars, peculiar radio-emitting filaments of ionized gas, supernova remnants, and a number of bright and compact objects whose natures and origins are unclear. Because of the high dust content along the line of sight to the Galactic Center, it has been impossible to observe this region at ultraviolet and optical wavelengths. New tools such as infrared array detectors combined with adaptive optics on large …

9 Octubre 2002: SBS 0335-052 is a gas-rich dwarf galaxy at a distance of 170 million light-years (52 Mpc). It is the second most metal-poor galaxy known, with a heavy metal content only 1/40th that of the Sun. Such a low metallicity means that this galaxy contains significantly lower quantities of the heavy elements produced by the process of nucleosynthesis in stars. This lack of metals could be because the galaxy is very young. Another possibility is that SBS 0335-052 is an old galaxy that has experienced a very low star formation rate throughout its lifetime. Canadian Ph. D. student Stephanie Plante (Universite Laval, Quebec) and French astronomer Marc Sauvage (Service d'Astrophysique, Saclay) used OSCIR on Gemini North to image SBS 0335-052 in the mid-infrared at 10.8 and 21 microns. Their images revealed a massive supercluster of young stars with a total mass equivalent to 2 million times the mass of the Sun …

26 Septiembre 2002: A US-UK team led by Gemini South astronomer Michael Ledlow, using the Gemini Multi-Object Spectrograph (GMOS) on Gemini North, has obtained a spectrum from the optical counterpart of the most distant "dusty" galaxy known. This object was selected for study based on a detection at submillimeter wavelengths using SCUBA* on the JCMT (Cowie, Barger, & Kneib 2002). The optical counterpart was found in deep multiwavelength imaging from the Kitt Peak National Observatory, but its nature was not understood (only a handful of SCUBA/submm galaxies have measured spectra). Gemini was able, with its great light gathering power, to obtain a spectrum that allows an analysis of this distant galaxy that is thought to represent some of the most massive galaxies of the early universe. Michael Ledlow and his collaborators studied the optical counterpart of the submillimeter source, SMMJ09431+4700 that is seen through an intervening galaxy cluster (Abell 851) at redshift 0.41. …

10 Septiembre 2002: From the Milky Way Suburbs to the Edge of the Universe This deep image obtained with the Gemini Multi-Object Spectrograph with the Gemini North Telescope shows a dramatic view of the universe as it can be revealed by the new generation of large ground-based telescopes. Not unlike the Hubble Space Telescope which is unhindered by the Earth's atmosphere, the present generation of very large ground based telescopes allows a unique view of the universe going from within our galaxy (by probing the faintest stars of the Milky Way) to the edge of the universe (like the central green object of this image which is probably at more than 10 billion light years away). Most of the galaxies appear faint because their light has come from so far that it traveled for much of the age of the universe. Many of these giant stellar systems, spirals and ellipticals, are as large …

27 Agosto 2002: Exploring mass sub-structure in the Einstein Cross lensing galaxy A gravitational lens is created when a massive foreground object (a large intervening galaxy in this case of the Einstein Cross) bends and amplifies the light from a far more distant object (a quasar in this case) directly behind it. In certain circumstances, the background object may be distorted or even multiply-imaged into two or four images. The Einstein Cross (Q2237+0305) is such a 4-image lens, where the bulge of a nearby spiral galaxy is lensing a very distant quasar. In the case of the Einstein Cross, the more distant quasar appears much brighter than the intervening galaxy and four images of the same quasar are formed. Without the intervening galaxy, the quasar image would be a single object of much fainter magnitude. The goal of the CIRPASS near-infrared spectroscopy program on the Einstein Cross is to explore mass substructures of …

13 Agosto 2002: The children and teachers of Hawai'i and Chile will be the first to benefit from a novel educational program made possible by Gemini Observatory's new high-speed Internet link that connects the twin telescopes on both hemispheres. Observatory Director Dr. Matt Mountain announced today the new Gemini StarTeachers Exchange Program between Hilo and its Sister City of La Serena, Chile - the two host communities of Gemini Observatory. The announcement was made from Gemini's Hilo Base Facility during a world-wide "virtual inauguration" demonstrating the Internet technology. (See related press release, "Celestial Cybernetics") "This is a learning process for all of us," Dr. Mountain said. "We're hopeful this first exchange program will provide us with valuable data and experience on the educational use of our evolving audio-visual Internet capabilities. We want to refine the technology, so we can continue and expand these community-type programs throughout our international observatory partnership." The goal of …

3 Junio 2002: On Monday afternoon, June 10, Big Island residents had the opportunity to safely view a partial solar eclipse where the Moon covered about half the Sun's surface. The public was invited to attend a Family Astronomy Afternoon to view the partial solar eclipse from 1 to 4 p.m. at the Gemini Observatory headquarters at University Park on the upper campus of the University of Hawai'i at Hilo (off Komohana). "This is a unique opportunity to view a partial solar eclipse and view the Sun safely through a telescope," said Dr. Richard Crowe, Professor of Astronomy at UH-Hilo. "I anticipate that we will also have some nice views of sunspots, if Hilo's weather cooperates." The event was jointly sponsored by the Hilo Astronomy Club, the UH-Hilo Department of Astronomy and the Gemini Observatory. At its maximum coverage, which occurred in Hilo at 2:47 p.m., the Moon hid almost exactly half the …

29 Abril 2002: Taken on April 23, 2002

4 Abril 2002: Arden Bercovitz, Ph.D., is a scientist portraying a scientist, creativity coach and keynote speaker recognized by the National Speakers Association. Dr. Bercovitz has performed as Einstein for over 10 years and his acclaimed characterization of the famous scientist has received praise from students, the media and scientists alike. Since asking questions was critical to Einstein's genius, the public is encouraged to question Einstein. Bercovitz, as Einstein, answers in character, weaving stories and answers from a wealth of Einstein quotes and powerful anecdotes that show Albert Einstein as not just a scientist, but also a visionary and humanist. Enlivened by dramatizations based closely on Einstein's writings and recollection of experiences, Bercovitz shares Albert's unique genius to help children and adults expand their thinking skills and broaden their horizons. All programs are free but seating will be limited and provided on a first-come-first-served basis. All programs are sponsored by the Gemini Observatory …

22 Febrero 2002: Phoenix, a high resolution infrared spectrograph, originally built for use on the NOAO 4-m telescopes at Kitt Peak and Cerro Tololo, underwent commissioning on Gemini South in December 2001. The first science observing programs were performed in early February 2002. They comprised a Demonstration Science program (described below) and individual science projects from the Gemini queue. Both the commissioning and the science runs were highly successful. Introduction to Demonstration Science Our universe initially was virtually entirely hydrogen and helium, as a result of the Big Bang. The heavier elements (which astronomers call "metals") that now make up a small fraction of the universe's mass and our sun's mass (but much of the mass of the earth, and our bodies) were made inside previous generations of stars, which exploded and ejected their material into space. Studies have shown that spiral galaxies, including our Milky Way, have higher abundances of "metals" in …

1 Junio 1999: Observations of globular clusters teach us how the first generation of stars in our Galaxy formed some 12 to 15 billion years ago and how they have evolved ever since. Globular clusters are extremely dense stellar environments that typically contain between one hundred thousand to one million stars. The density of these star cities presents us with a wealth of information on stars of all sizes but also presents a great challenge – how can we peer into the very heart of such a dense star cluster? Gemini, with its excellent image quality, can provide extremely sharp pictures that deblur and deblend the star images and allow observations right into the very heart of these oldest stellar environments. The optical picture on the left is sharp and clear because of the good atmospheric conditions on Mauna Kea and the excellent optical quality of the Gemini telescope. Yet NGC 6934 contains …