Articles tagged with Observational Astrophysics
Observations of SN 2003jd reveal aspherical explosion, supporting hypothesis that Type Ic supernovae can produce gamma-ray bursts. The findings also suggest that the direction-dependent shape of the oxygen line is a key indicator of an aspherical explosion.
A new study reveals that Coronal Mass Ejections (CMEs) can originate from tiny magnetic regions on the Sun, challenging current theories. The research used data from NASA/ESA's SOHO spacecraft and found that these mini-CMEs were energetic enough to reach Earth, causing aurora and disrupting satellite communications.
The Chandra X-ray Observatory has observed an X-ray outburst from the highly evolved red giant star Mira A, revealing a bridge of hot matter streaming between it and its companion white dwarf. The detection provides insights into interactions between binary systems, including those with a collapsed star.
Researchers using the DEEP2 Galaxy Redshift Survey observe a fundamental constant unchanged over 7 billion years. The fine structure constant affects atomic interactions and light emission, with no variation detected in distant galaxies.
Researchers have found that some galaxies and their central black holes underwent a phenomenal growth spurt, setting the stage for the birth of quasars. The study used Chandra X-ray observations to track the growth of supermassive black holes alongside the formation of stars in these galaxies.
Researchers have directly measured light from two confirmed extrasolar planets, HD 209458b and TrES-1, using NASA's Spitzer Space Telescope. The gas giants, similar to Jupiter, orbit close to their stars and radiate strongly in the infrared, with temperatures reaching up to 1,574 degrees Fahrenheit.
Astronomers have detected periodic X-ray variations in a galaxy, suggesting a massive black hole with a mass of approximately 10,000 Suns. This finding provides strong evidence for the existence of intermediate-mass black holes, which could bridge the gap between stellar-mass and supermassive black holes.
A team of researchers has found evidence of dark energy in the universe's cosmic neighborhood, with billions of galaxies emerging from a sea of dark energy. The findings provide supporting evidence for the presence of dark energy, which is causing the universe to accelerate in expansion.
The Einstein@Home project enlists thousands of home computers to analyze data from LIGO and GEO-600 detectors, searching for subtle ripples in space-time predicted by Einstein's General Theory of Relativity. By involving hundreds of thousands of people, the project aims to discover gravitational waves and validate theoretical physics.
A team of astronomers has discovered a remote galaxy cluster that is as massive as several thousand galaxies like our Milky Way and is located 9,000 million light-years away. The cluster contains reddish and elliptical galaxies with old stars, indicating it formed when the Universe was less than one third of its present age.
A team of researchers has discovered a web-like system of gas clouds containing the missing baryons, which are thought to make up half of the universe's mass. The clouds, detected using X-ray telescope data, have temperatures of around 1 million degrees Celsius and are spread over vast distances.
Astronomer Dr. Schaefer has discovered a long-lost star catalog of Hipparchus, an ancient Greek astronomer, on the Roman statue Farnese Atlas. The catalog, which dates back to 129 B.C., was previously thought to be lost and its accuracy questioned.
Astronomers discovered a record-breaking eruption of hot gas and cavities in galaxy cluster MS 0735.6+7421, fueled by a super massive black hole growing at an incredible rate. The event generated energy equivalent to hundreds of millions of gamma-ray bursts.
Using the Spitzer Space Telescope, Hubble Space Telescope, and Chandra X-ray Observatory, researchers observed the Kepler's supernova remnant, uncovering a bubble-shaped shroud of gas and dust expanding at 4 million miles per hour. The observations revealed distinct features, including heated interstellar dust and regions of hot gas.
The SNEWS system, an international collaboration of neutrino observatories, aims to provide astronomers with a prompt alert for galactic supernovas. This network can electronically compare data to increase scientists' confidence that a neutrino signal is really from a supernova.
Astronomers have discovered a Jupiter-sized gas giant orbiting a star located 500 light-years from Earth. The newly found world circles its star every 3.03 days at a distance of only 4 million miles, much closer and faster than Mercury in our solar system.
Scientists have discovered a distant planet using the transit technique and spectroscopy, revealing key findings about TrES-1's atmosphere and orbit. The discovery marks the first extrasolar planet found by a dedicated survey of thousands of relatively bright stars.
Astronomers using the European AVO Virtual Observatory have discovered a whole population of obscured, powerful supermassive black holes in the GOODS survey fields. The team found thirty objects, which they believe were underestimated by a factor of two to five.
Researchers used the Gemini telescope to produce sharp infrared images of quasar host galaxies, finding only one convincing detection that was unremarkable in size and brightness. This challenges previous assumptions about the relationship between quasars and their host galaxies.
A team of astronomers at Penn State used the Hobby-Eberly Telescope to detect a cometlike body falling onto a massive, very young star. The infall, which occurred about 3200 years ago, provided dramatic spectral variations in the star's light. This discovery sheds light on planetary formation and the evolution of massive star systems.
Astronomers have successfully detected their first two near-Earth asteroids (NEAs) using a refurbished telescope at the Australian National University's Siding Spring Observatory. The discoveries, made on March 29, include an 100-meter and 300-meter asteroid that pose no direct threat to Earth.
The GEMS consortium presents the largest contiguous color image taken by the Hubble Space Telescope, comprising over 40,000 galaxies. The team uses this image to investigate how large galaxies evolved over the last nine billion years.
The Gemini Deep Deep Survey has revealed a greater abundance of more massive and older galaxies than expected, dating back to the early universe. The discovery challenges current models of galaxy formation and suggests an accelerated growth phase for galaxies.
A team led by Reinhard Genzel reports detecting powerful infrared flares from a region just outside the supermassive black hole, indicating rapid rotation. The observed signals suggest that the black hole's fundamental orbital time is about half of the maximum spin allowed by general relativity.
The DEEP2 Redshift Survey has produced the first detailed maps of galaxy distribution in the early universe, revealing large-scale structures and differences in galaxy clustering. These maps show similar structures to those seen in the local universe but at an earlier stage of development.
A team of researchers has made a groundbreaking discovery linking black hole growth to galaxy evolution. The study found that more than 20,000 galaxies contain growing black holes, mostly in massive galaxies with recent star formation. As the rate of black hole growth increases, so does the amount of recent star formation.
A new 3D map of local space reveals the Sun at the center of an irregular cavity, surrounded by a dense wall of gas. The map suggests that interlocking cavities and tunnels were created by supernovas or strong stellar winds.
Researchers have found evidence of high-speed winds blowing copious amounts of gas from the cores of quasar galaxies, powered by black holes. The winds may regulate black hole growth and create new stars, with a wind transporting substantial amounts of carbon, oxygen, and iron into the interstellar medium.
Researchers detected a sudden cooling of the star Rho Cassiopeiae in 2000, resulting in an unprecedented mass ejection into space. The star is now considered one of the brightest yellow hypergiants in the Milky Way, with a luminosity over half a million times that of the Sun.
Researchers discovered that giant solar loops can erupt explosively, releasing massive amounts of plasma and heat. The longer the loop, the more likely it is to erupt, posing a threat to satellites and space weather.
Researchers at Ohio University have discovered a massive X-ray disk in an elliptical galaxy, revealing complex dynamics and challenging previous assumptions about galaxy formation. The giant disk is 90,000 light years wide and spinning through the galaxy, suggesting that elliptical galaxies may not be as simple as previously thought.
Astronomers detected two active black holes at the center of galaxy NGC 6240 using NASA's Chandra X-ray Observatory. The binary black hole system will eventually merge, producing massive gravitational waves detectable by LISA.
Astronomers uncover a star with extremely low element abundance, providing a unique window into the Milky Way's early stages. The discovery challenges current theories and offers hope for finding 'unpolluted' Big Bang material.
Researchers tracked a star's orbit around a suspected black hole in the Milky Way, revealing its massive gravitational pull. The observation provides key evidence for the existence of a supermassive black hole at the galaxy's center.
Adaptive optics systems are expanding ground-based astronomy capabilities, enabling unprecedented views of the universe. The technology has already produced eightfold improvements in image quality at observatories like the W.M. Keck Observatory in Hawaii.
Astronomers detect ND3, the first molecule with three deuterium atoms, in a molecular cloud at distances of 500 to1000 light-years from Earth. The discovery suggests that gas-phase reactions are responsible for producing molecules in interstellar space.
Brown dwarfs have long been observed to appear brighter as they cool, but scientists couldn't explain the phenomenon until now. Using a model that takes into account cloudy storm patterns, researchers have found that atmospheric weather on brown dwarfs can cause them to brighten, similar to Jupiter's Great Red Spot.
The DEIMOS instrument will multiply the power of current Keck spectroscopy by a factor of seven, enabling observations of distant galaxies and shedding light on the formation and evolution of galaxies. With its massive detector and advanced optics, DEIMOS will create the most comprehensive map of the distant universe ever attempted.
Researchers propose a new mechanism to explain the X-ray galactic ridge's origin, involving low-energy cosmic rays interacting with neutral molecular clouds. The study suggests that this process can produce the observed X-ray emission without requiring dramatic events or unusual astrophysical processes.
Astronomers have produced a new spectral atlas of massive, hot O-type stars in the Magellanic Clouds. The atlas provides detailed information on the stars' temperatures and life cycles, helping researchers analyze these critical engines driving galaxy evolution.
A team of astronomers has directly observed a Dark Matter object, confirming the theory that it consists of small, faint stars in galaxies like our Milky Way. The detection was made using the Hubble Space Telescope and the European Southern Observatory's Very Large Telescope.
An international team of astronomers has discovered a very massive stellar black hole in the Milky Way Galaxy, weighing 14 times more than our Sun. The black hole is located in the binary system GRS 1915+105 and feeds on a low-mass star through a steady flow of stellar material.
Researchers analyzed sound waves from the Solar and Heliospheric Observatory to map the temperature and flow structure beneath sunspots. The study revealed fast-moving streams of hot plasma converging into a gigantic vortex that penetrates the solar surface.
A team of scientists discovered a small, faint galaxy at 13.4 billion light-years using the Hubble Space Telescope and Keck Telescopes. The galaxy, with a mass of just a few million times that of our Sun, is thought to be one of the earliest building blocks of galaxies.
The center supports an interdisciplinary team of scientists aiming to explore the first signals detected from gravitational waves generated by massive objects in the universe. Researchers anticipate collecting data from new detectors in the US, Europe, and Japan, plus a space-based detector.
A team of scientists led by Leisa Townsley has found evidence of X-ray-emitting gas in the Rosette Nebula, a star-forming region. This gas is thought to be created by the collision of stellar winds from massive stars and may play a significant role in shaping the galaxy's interstellar medium.
Astronomers use a flickering quasar image to estimate the expansion rate of the Universe and measure distances to extragalactic objects. The Chandra X-ray Observatory's mirage technique provides a promising method to avoid uncertainties in classic distance-ladder techniques.
New analysis reveals Comet LINEAR might have begun coming apart in mid-June, contrary to initial predictions. The comet's erratic behavior and eventual demise thrilled astronomers, who are now studying the data to understand its breakup process.
New Chandra X-ray Observatory images reveal a luminous spike from a giant black hole, a compact nebular resembling a cosmic crossbow, and a hot bubble of gas surrounding a dying star. These observations contradict theoretical predictions, indicating the presence of high-energy particles beyond expectations.
Scientists have imaged the pressure fronts in a colossal cosmic 'weather system' produced by the collision of two giant clusters of galaxies. The data reveals a bright but relatively cool central region embedded in a large cloud of hot gas. This is the first detailed look at the late stages of this merger process.
A newly discovered quasar has surpassed the previous record holder as the earliest known structure in the universe, with a red shift of 5.50 and light journeying 13 billion years to reach Earth. The quasar's discovery sheds light on cosmic evolution and matter distribution at earlier stages of history.
Astronomers pinpointed a gamma-ray burst's precise location using coordinated observations from NASA satellites, providing data on X-rays and visible energy. The blast occurred over 10 billion light years away, roughly 2 billion years after the Big Bang.
Astronomers discovered a potential satellite orbiting Comet Hale-Bopp using Hubble Space Telescope images. Sekanina's model suggests a 33-kilometre-wide moon about 200 kilometres from the comet's nucleus.
The Chandra X-ray Observatory has been selected as one of the top 100 'Best of What's New' items by Popular Science magazine, highlighting its significant contributions to X-ray astronomy. The observatory is already sending back impressive images that are aiding in understanding exploding stars, black holes, and other celestial phenomena.
Researchers have found two nearby streams of stars that appear to be debris from a single dwarf galaxy torn apart by the Milky Way's gravity about 10 billion years ago. These relic streams are part of the Milky Way's outer structure and provide insights into its formation.
Gamma-ray bursts remain a mystery despite over 2,500 recorded events and numerous burst sources identified. Scientists caution against interpreting data carefully due to potential systematic errors in measurement systems.
Researchers from the University of Notre Dame and NASA's Goddard Space Flight Center used an infrared spectrometer to determine the carbon monoxide/water ratio in comet Hale-Bopp. The findings suggest that the comet formed 4 billion years ago, providing clues about its history and composition.
A worldwide study of the Sun's quiet period reveals insights into solar activity and its effects on Earth. The research, published in the Journal of Geophysical Research, explores the Sun's large-scale, stable structures that dominate the solar corona at solar minimum.
A team of U.S. astronomers has discovered a massive concentration of water vapor within a cloud of interstellar gas close to the Orion nebula, measuring 20 times larger than observed in other clouds. The high amount of water vapor could provide crucial clues about the origin of water in the solar system.
Scientists have discovered the most distant known object in the cosmos, a young galaxy existing when the universe was only 6% of its present age. The serendipitous discovery raises hopes for resolving two central questions in astrophysics: how and when did galaxies form.