Sentences with phrase «spectral lines»

Gamache, R.R., R. Lynch, and S.P. Neshyba, 1998: New developments in the theory of pressure - broadening and pressure - shifting of spectral lines of H2O: The complex Robert - Bonamy formalism.

Ma, Q., R.H. Tipping, G. Birnbaum, and C. Boulet, 1998: Sum rules and the symmetry of the memory function in spectral line shape theories.

Such a break is found in the spectrum of all remote objects (from the crowding of absorption lines creating an effect known as the «Lyman - alpha forest» before the Lyman - alpha spectral line at rest wavelength 121.6 nm).

The challenge for astronomers is to identify that fingerprint among the forest of spectral lines from all the other chemicals in the cloud.

The Argus millimeter - wave camera on the GBT produces data cubes of the emission from spectral lines with high spectral and spatial resolution.

Based on the wavelengths of spectral lines emitted by the luminous gas surrounding the black hole, the object is traveling at a speed of about 7.5 million kilometers per hour — a rate that would carry it from Earth to the moon in about 3 minutes.

In their paper published in Nature the physicists from the University's College of Science, working with an international collaborative team at CERN, describe the first observation of spectral line shapes in antihydrogen, the antimatter equivalent of hydrogen.

This year, she will have 30 people at 5 sites across the western United States using enhanced detectors to look for spectral lines from superheated elements such as iron and argon.

These studies which are based on spectral line observations of molecular gas suggest a new method of potentially discovering inactive isolated black holes that are undetected by traditional method such as X-ray observations.

[16] This two - dimensional (temperature and luminosity) classification scheme is based on spectral lines sensitive to stellar temperature and surface gravity, which is related to luminosity (whilst the Harvard classification is based on just surface temperature).

Its hallmark feature is its ability to capture the very red spectral line H - alpha, created when the electron inside a hydrogen atom loses energy, a prominent occurrence in a nebula like Sharpless 29.

We use $ ^ -LCB- 12 -RCB- $ CO, $ ^ -LCB- 13 -RCB- $ CO and C$ ^ -LCB- 18 -RCB- $ O spectral line data to independently describe the outflow and envelope structures associated with HBC... ▽ More We present Atacama Large Millimeter / sub-millimeter Array (ALMA) Cycle - 2 observations of the HBC 494 molecular outflow and envelope.

Yet so far, star formation historians have mostly relied on other indicators to write their histories: light at a particular frequency that is typically emitted when giant clouds collapse, heating up in the process and radiating away that heat in the form of specific spectral lines.

The object studied here has a redshift of z = 5.913, i.e., the Lyman - alpha spectral line of hydrogen at 1216 angstrom (Å) at the rest frame is detected at 8406 Å, when the Universe was about one billion years old.

Owen's team found many spectral lines due to methane, which is easier to detect than nitrogen.

The red color represents spectral line emission from hydrogen atoms.

If the atoms are excited, they emit these same wavelengths, hence one can determine precisely which spectral lines belong to which element.

We use $ ^ -LCB- 12 -RCB- $ CO, $ ^ -LCB- 13 -RCB- $ CO and C$ ^ -LCB- 18 -RCB- $ O spectral line data to independently describe the outflow and envelope structures associated with HBC 494.

Actually, as for almost all planetary nebulae, most of the visible light is even emitted in one spectral line only, in the green light at 5007 Angstrom (see our planetary nebula description)!

Graduate student Jialu Li, in collaboration with the Argus instrument team and DEGAS project, made these images (the highest frequency spectral line observations the Green Bank Telescope has ever made) in only 10 hours on 2017 October 25 and 26.

The Caltech comb produces spectral lines in the infrared, making it ideal for studying red dwarf stars, the most common stars in the Milky Way.

In addition, we use APEX for spectral line mapping to study the complex background around aCen seen in the photometric images.

Shining a laser through the gas, TLS can measure spectral lines with far higher resolution than terrestrial telescopes and detect methane with much greater sensitivity.

The resulting spectral lines from the entire galaxy blend together to form a FAT line.

The authors utilize line - of - sight (LOS) magnetic field data and spectral line information obtained by the Helioseismic and Magnetic Imager (HMI) instrument aboard the Solar Dynamics Observatory (SDO).

Different molecules absorb light at certain wavelengths, or colors, resulting in dark spectral lines.

Later that year, English astronomer Joseph Lockyer observed the same spectral line, wrote a paper and also sent it to the French Academy of Sciences.

The metallicity of the gases in the protocluster galaxies was studied using multiple spectral lines emitted from them.

The team did not apply the proper statistical methods to rule out random fluctuations in the x-rays that can mimic spectral lines, says astrophysicist Masao Sako of the California Institute of Technology (Caltech) in Pasadena.

In a valley in Idaho, a French team will analyse spectral lines in the corona, in part to support the infrared work of the CfA team, says Serge Koutchmy, an astronomer at the Institute of Astrophysics in Paris.

As astronomers report online today in Nature, the Herschel Space Observatory has discerned a watery spectral line at the far - infrared wavelength of 538 microns.

Astrophysicist Paul Westoby and colleagues from Liverpool John Moores University in the U.K. used data from the Sloan Digital Sky Survey to survey spectral lines from 360,000 relatively nearby galaxies.

The flood of data is providing a wealth of new spectral lines for astrochemists to mine.

Almost everywhere in the universe astronomers look — if they peer closely enough — they see unidentified spectral lines.

In the past decade, as powerful new telescopes capable of observing faint spectral lines have come online, the search for alien molecules has accelerated.

They detected a weak spectral line at 2.15 micrometres, a wavelength absorbed by nitrogen ice.

They plan to measure other spectral lines and even test the pull of gravity on antihydrogen — to see if it is pulled down or pushed up.

It had strange spectral lines, he noted.

They eventually collected 3700 separate spectral lines, and 51 of them, the team reports in an article in press in Astronomy and Astrophysics, were unmistakably amino acetonitrile, a molecule that resembles a primitive amino acid.

The spectrum of a frequency comb consists of a large number of discrete evenly spaced spectral lines.

An international advisory committee for the definition of the meter has now recommended the adoption of an atomic standard of length — an orange spectral line of krypton 86.

Two decades ago, astronomers found interstellar spectral lines at near - infrared wavelengths and said they likely arose from carbon - 60 molecules that had lost one electron each.

The new discoveries were made with the help of the radial velocity method, which looks for the periodic shifts of certain spectral lines in a star's light that are caused by the gravitational tug of invisible planets which orbit the star.

The more random motion there is in an elliptical galaxy, the greater the spread in the distribution of velocities and the fatter the resulting galaxy spectral lines will be.

Measurements taken by a team of astronomers from the Universities of Geneva and Bern are given in the framework of the PlanetS NCCR; the figures come from observations made over sodium spectral lines.

The research team conducted spectral line observations of the Galactic central region within 30 light years of the Galactic nucleus Sgr A * to investigate kinematics and physical properties of molecular gas surrounding the nucleus, using the JCMT.

(b) Integral intensity map of the Galactic central region around Sgr A * (shown by a white star) in the hydrogen cyanide (HCN) 354.6 GHz spectral line.

The groups reported the presence of a previously undetected spectral line, with an energy of 3.5 kiloelectron volts (keV), in x-ray light from distant galaxies and galaxy clusters.