Búsqueda avanzada de imágenes

21 Marzo 2016: Observations using the Gemini Multi-Object Spectrographs (GMOS) on both Gemini North and South telescopes have revealed the fastest ultraviolet wind ever measured in a quasar. Gemini spectroscopic data of the quasar is shown in figure at [orientation].The research, which clocked winds at almost 20 percent of the speed of light, is highlighted in the following press release from York University in Toronto, Canada. The paper/abstract can be found in this link to the Monthly Notices of the Royal Astronomical Society. York University astrophysicists detect ultra-fast winds near a black hole TORONTO, March 21, 2016 – New research led by astrophysicists at York University has revealed the fastest winds ever seen at ultraviolet wavelengths near a supermassive black hole. “We’re talking wind speeds of 20 per cent the speed of light, which is more than 200 million kilometres an hour. That’s equivalent to a category 77 hurricane,” says Jesse Rogerson, who …

29 Febrero 2016: Research shows that supermassive black holes like to be the only residents on the block, as stars too close to them end up being thrown vast distances from the galaxy's center. As black holes eject stars around them, the neighborhood becomes darker. Astronomers have been hunting for these gloomy neighborhoods in galaxy cores for decades. The signature of supermassive black holes are known as light deficits, due to the lack of stars surrounding them. Gemini Science Fellow, Juan Madrid and Carlos Donzelli from the Cordoba observatory in Argentina were granted observations through the Director's Discretionary Time, and used new Gemini data to study the brightest galaxy of the galaxy cluster Abell 85 to verify earlier observations hinting that one of the most supermassive black holes ever discovered resided at the galaxy's core. Gemini sets the record straight - in seven minutes The Gemini Multi Object Spectrograph (GMOS) at Gemini South …

18 Febrero 2016: Astronomers use Gemini’s high-resolution multi-conjugate adaptive optics system to look for elusive companions to the lowest mass brown dwarfs. Y-type brown dwarfs, the coolest type of brown dwarfs known, provide an important link in the study of objects between stars and planets. While the fraction of binary systems associated with warmer and brighter brown dwarfs is well-established, because the Y spectral class is so new (the first Y-type brown dwarfs were only confirmed in 2011) there is little known about what fraction of Y dwarfs have companions. The Y dwarfs are generally lower in mass than the warmer brown dwarfs. For the warmer brown dwarfs, the frequency of binary systems diminishes with brown dwarf mass, and companions tend to be closer to their host and lower in mass themselves. Scientists wonder if this same trend continues for the Y dwarfs. A research team, led by Daniela Opitz (University of New …

10 Febrero 2016: An extremely red planetary-mass object is confirmed, based on Gemini observations, to be a free-floating member of the Beta Pictoris moving group. This is one of only a handful of directly imaged planets available for spectroscopy – allowing scientists to probe the world’s physical characteristics. The team, led by K. Allers of Bucknell University (US), used the Gemini Near-InfraRed Spectrograph (GNIRS) on the Gemini North telescope to obtain spectra of the object and determine its radial and rotational velocities. These data provide the key to confirming that PSO J318.5-22 is a member of the Beta Pictoris moving group at the 99.7% level. Estimates of the mass of such objects are extremely sensitive to age, so confirmation of the group membership yields a more reliable mass: 8.3 ± 0.5 times the mass of Jupiter, with an effective temperature of about 1130 K. The Gemini spectra reveal that the body rotates at …

21 Enero 2016: Base Facility Operations (BFO) are now fully implemented for the Gemini North telescope. All operations are now routinely conducted each night from the Hilo Base Facility. The implementation of BFO at Gemini North is the culmination of several years of work by most of Gemini's staff. This includes significant infrastructure improvements at the telescope and base facilities, software upgrades, staff training, and changes at all levels of operations. The result is a milestone that has revolutionized the way Gemini operates and acquires data. Observing crews at Gemini North have been testing the BFO mode since September of 2015. The night crews report that observing is much more efficient in this mode, and the science staff were thrilled to see the system go live from Hilo as our standard operations model. Gemini's Director Markus Kissler-Patig adds that in addition to this being a first for an 8-10 meter-class telescope, Gemini is …

22 Diciembre 2015: TW Hydrae (TW Hya) is one of the best-studied young stars in the galaxy.At just 180 light years from Earth and a ripe young age of roughly 8 million years, this nearly solar-mass star and its orbiting, circumstellar disk of dust and gas are prime targets to better understand the processes involved in star and planet formation. The most sensitive telescope systems available, accessing wavelengths from radio to X-ray, have observed the TW Hya system. Astronomers have now used the Gemini Planet Imager (GPI) on Gemini South to image infrared light from TW Hya that is scattered off dust grains in its surrounding disk. The new GPI images confirm the presence of a darkened ring or gap in the disk at 23 AU (i.e., 23 times the earth-Sun distance) -- and GPI brings this gap into the sharpest focus yet. Comparison with detailed numerical simulations of planets forming in circumstellar …

14 Diciembre 2015: A team of Australian researchers used two Maunakea-based observatories – Gemini North and W. M. Keck Observatory – to discover why some galaxies are clumpy rather than spiral in shape and it appears that low spin is to blame. The finding challenges an earlier theory that high levels of gas cause clumpy galaxies, and sheds light on the conditions that brought about the birth of most of the stars in the Universe. The finding was published today in The Astrophysical Journal. A combination of integral field spectroscopy data from Keck Observatory and Gemini Observatory was the key to obtaining measurements for a galaxy’s spin. Keck Observatory’s OSIRIS instrument collected data high spatial resolution in the galaxy centers, and the Gemini Multi-Object Spectrograph (GMOS) collected data for high surface brightness sensitivity out to large radii. The rest of the text is adapted from the International Centre for Radio Astronomy Research press …

30 Noviembre 2015: Observations using the Gemini Planet Imager are featured prominently at the Extreme Solar Systems III meeting ongoing this week (Nov. 29 - December 4) in Waikoloa Hawai‘i. Below are two results from a press conference on December 1, 2015.

23 Noviembre 2015: Gemini observations provide a key scientific context for a striking new image of the gravitationally lensed galaxy group popularly known as the Cheshire Cat. The image, released by NASA’s Chandra X-ray Observatory, combines X-ray data with optical images from the Hubble Space Telescope to paint a remarkable likeness to the famously devious smiling cat in Lewis Carrol’s Alice in Wonderland. Behind the scenes, Gemini played a critical role in the image’s scientific story by taking the spectral fingerprints of many of the galaxies that make up the foreground cluster which bends the distant galactic light. For more details on the image, and how gravitational lenses work, see the Chandra press release here. Gemini South astronomer Rodrigo Carrasco, a co-author on the paper which spawned the image, adds that Gemini provided the core spectroscopic data that allowed the team to fully characterize the cluster of foreground galaxies which serves as the …

10 Noviembre 2015: The following is based on a translation of the Korean press release. A team of Korean astronomers discovered a faint quasar in the early Universe which sheds light on the main sources of illumination about 1 billion years after the Big Bang. The team used the Gemini South telescope in Chile, and several telescopes on Maunakea in Hawai‘i, to make the discovery. This is the first published scientific result from the Korean astronomical community since the Korea Astronomy and Space Science Institute (KASI) joined in a limited partnership with Gemini at the beginning of 2015. The history of objects we see today in the Universe started when the first stars formed a few hundred million years after the Big Bang. However, it has been unclear what types of objects illuminated the intergalactic medium in order to ionize neutral atoms (called the re-ionization of the universe). Quasars, because they are so …

2 Noviembre 2015: After 18 days of hard work during the recent scheduled maintenance shutdown, the Gemini South telescope is back on the sky! During maintenance, which took place October 13th - 30th, the 8.1-meter primary mirror received a fresh multi-layer protected silver coating - a key task for the shutdown.

29 Octubre 2015: A team of Norwegian and US astronomers, using data from Gemini North and the Nordic Optical Telescope (NOT), have measured the time delay in images of a quasar lensed by a foreground cluster of galaxies. The Gemini observations are the first published result obtained with the innovative Fast Turnaround (FT) mode of observing. A distant quasar may have its light split into multiple images by a foreground galaxy cluster that acts as a gravitational lens. The light travels along different paths of differing lengths to form each of these images. Quasars themselves are intrinsically variable, so the observed fading and brightening of each image happens at different observed times. Measuring these “time delays” yields tight constraints on the mass distribution in the lensing cluster, as well as the lensing geometry, and hence cosmology. The team monitored the redshift z=2.82 quasar SDSS J2222+2745 over the course of three years, using the …

22 Octubre 2015: Gemini Observatory kicked off its week-long program Viaje al Universo with an opening ceremony at the University of La Serena. The annual program is an immersive week of fun, hands-on learning focusing on local students and teachers. Gemini’s invited international guests also joined in the celebration, highlighting their program: The Big Van “Science on Wheels.” “We are thrilled to be able to engage local students and make them laugh, and even though they might not know it, learn science!”, said Alberto Vivó of of the three members of the Big Van troupe. More information about this group can be found at: www.thebigvantheory.com “Gemini is thrilled that we have many new partners in our effort this year,” said Gemini Deputy Director Nancy Levenson. “It is indeed a sign that we are having an impact when our community steps up to participate actively in our work.” The University of La Serena’s Deputy …

21 Octubre 2015: The nearest spiral galaxy with a nuclear starburst (greatly enhanced star formation near a galaxy’s center) is also the site of a long-standing astronomical mystery. Designated NGC 253, or by amateurs as the Silver Dollar Galaxy, the core of this galaxy is so shrouded by gas and dust that the exact location of its core has remained unresolved for years. Now, thanks to research by Guillermo Günthardt of the National University of Cordoba (Argentina), Gemini South infrared data appear to have unambiguously pinpointed the galaxy’s core. In the process, evidence for a lowish-mass, but rapidly growing, black hole as the starburst’s trigger is painting a new picture of this enigmatic galaxy (Figure 1). NGC 253 is the nearest spiral galaxy with a nuclear starburst. The nuclear region is so veiled by large amounts of dust associated to the star formation process that it has been unclear, until now, where this …

30 Septiembre 2015: Expecting to resolve stars deep into the crowded field of a globular cluster is a tall order for ground-based telescopes. However, Paolo Turri (University of Victoria, Canada) and colleagues have used the Gemini Multi-conjugate adaptive optics System (GeMS) with the Gemini South Adaptive Optics Imager (GSAOI) to do just that. Their data present the most accurate and deepest near-infrared photometry from the ground of a crowded field. It also illustrates the remarkable potential of MCAO-equipped Extremely Large Telescopes of the future. Their Ks measurements of the Galactic globular cluster NGC 1851 are combined with HST photometry and the resulting color-magnitude diagram demonstrates that the ground-based data is of an unprecedented depth and precision for crowded field observations. The delivered image quality approaches Gemini’s diffraction limit, with an average measured full-width at half-maximum (FHWM) of 0.09 arcsecond. Abstract: The Extremely Large Telescopes currently under construction have a collecting area that is …

23 Julio 2015: An international team of astronomers from Canada and the United States recently discovered 42 new brown dwarfs using data from the near-infrared imager and spectrograph Flamingos-2 at Gemini South and other telescopes in Chile and Hawai’i. The team used Flamingos-2’s near-infrared spectroscopic capabilities to study a total of 101 targets from 2013 to 2015. The work, led by Jonathan Gagne, from the University of Montreal, confirmed signs of low-gravity for 42 of the objects with estimated masses between 8 to 75 times that of Jupiter. Further, the team identified previously unrecognized signs of low gravity for 24 known brown dwarfs. This kind of object has an important role in explaining part of the process of star formation, as current stellar formation models include the production of a non-negligible fraction of free-floating planets. Additionally, the research shows that some objects, that were thought to be brown dwarfs, were indeed much less …

27 Mayo 2015: Using the Gemini Planet Imager (GPI) at the Gemini South telescope in Chile, astronomers have discovered a young, emerging planetary system that shares remarkable similarities to our own Solar System in its infancy. GPI images reveal the disk as a bright ring of dust around a star only slightly more massive than the Sun. It is located about 360 light-years away, in a region similar to that in which the Sun was formed. The disk is not perfectly centered on the star, likely sculpted by one or more Solar System-like planets. Even more remarkable, the disk is almost exactly the same distance from its host star as, and may have a composition similar to, our Solar System’s Kuiper Belt. The Kuiper Belt is a region of micron-sized dust to moon-sized objects like Pluto left over from the formation of our Solar System more than 4 billion years ago. “It’s like …

2 Abril 2015: Astronomers using the Gemini South telescope in Chile have discovered striking new evidence for planet formation in a dusty disk surrounding a pair of stars in Sagittarius. The team took advantage of an offering for Early Science using the Gemini Planet Imager to study infrared light scattered off dust grains in the disk around the binary system V4046 Sgr. "The Gemini Planet Imager allows us to study nearby planet forming disks in sufficient detail that we can obtain direct-image evidence for young planets in orbits similar to those of the giant planets in our own solar system," says Valerie Rapson of the Rochester Institute of Technology, who led the research team. Indeed, the GPI imaging reveals an intriguing double ring structure around the V4046 Sgr binary that is most likely due to the formation of a giant planet (or planets) at some 4-12 times the Earth-Sun distance (approximately between Jupiter …

25 Marzo 2015: Changes in the universe don’t often happen on human timescales. In the cosmic “blink of an eye,” astronomers have detected rapid changes in brightness and appearance of a restless stellar nursery in Orion. The luminous cloud of gas, going by the designation Re50, first appeared about half a century ago in the constellation of Orion. Now, astronomers using the Gemini South telescope, and other telescopes around the world, have discovered that the chaotic caldron has once again brightened further. According to team member Bo Reipurth, of the University of Hawaii’s Institute for Astronomy, “This most recent brightening, happened, I believe in 2014, when unfortunately we weren’t able to look since Orion was in the Sun’s glare.” Reipurth adds that areas of stellar birth, in this case called a Class I protostar, are extremely dynamic places and change on human timescales, “… while we missed the initial brightening event, we can …

12 Marzo 2015: The Orion Nebula, probably the most well-known deep sky object in the night sky, also offers rare glimpses into catastrophic episodes in the lives of stars. Widespread, high-velocity outflow points to an explosive origin of the region known as the “Orion Fingers.” With new observations using adaptive optics imaging from Gemini South, John Bally of the University of Colorado and colleagues find over 120 high-velocity outflows in this region. Direct comparisons with earlier observations reveal the motion of these fingers. Measurements of their properties, and comparison with simulations, are evidence that an explosive event drives the outflows, which may be connected to the birth of “runaway,” massive stars. Abstract: Aims. Adaptive optics images are used to test the hypothesis that the explosive BN/KL outflow from the Orion OMC1 cloud core was powered by the dynamical decay of a non-hierarchical system of massive stars. Methods. Narrow-band H2, [Fe II], and broad-band …