Articles tagged with Observational Astrophysics
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.
A team of scientists at NCAR has developed a new method to accurately quantify the total radiative output of the sun, including ultraviolet, visible light, and infrared wavelengths. This breakthrough will provide better information on the sun's influence on earth's climate and improve our understanding of solar variability.
NASA's Burst and Transient Source Experiment (BATSE) has recorded its 2000th gamma-ray burst, a significant milestone in the study of these violent cosmic events. The 2000th burst was smaller than average, but adds to the growing body of knowledge about gamma rays and their origins.
The Johns Hopkins University Applied Physics Laboratory's NEAR spacecraft has detected a major gamma-ray burst, validating its instrument as a true partner in the interplanetary network. The detection expands the network to locate gamma-ray sources with greater accuracy.
Despite intensive searches, only a few gamma ray burst counterparts have been found, leaving scientists with more questions than answers. The lack of consistent patterns hampers the search, but continued observations with powerful instruments may help clarify the issue.
The Boston University team successfully captured the first-ever image of Hale-Bopp's three tails, providing new insights into the comet's composition. The team's innovative detector system and modest telescope size allowed them to detect faint signals from sodium gas, which is not visible to the naked eye.
Astronomers studied comet Hale-Bopp with the Hubble Space Telescope, finding that its nucleus may be more complex than previously thought. The findings suggest that components like carbon disulfide ice are not contained within water, but rather in separate regions of the nucleus.
Scientists detect unique X-ray vibrations in black hole candidate GRS 1915+105, potentially revealing its mass and rotation rate. The discovery is consistent with predictions made by the Stanford astrophysics group three years ago.
Astronomers use BATSE to detect four rare cosmic gamma-ray bursts, sparking debate about their origin and distance. The events appeared in rapid succession over two days from the same general position in the sky.
The SOHO mission has provided stunning images of the Sun's south polar region, revealing that even in quiet areas, there is tremendous activity. The observations suggest that solar plumes are associated with small regions of high magnetic activity and are more dynamic than previously thought.