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Thursday, January 30, 2020 | History

4 edition of High-resolution spectroscopy of quasars and quasar absorption-line systems found in the catalog.

High-resolution spectroscopy of quasars and quasar absorption-line systems

High-resolution spectroscopy of quasars and quasar absorption-line systems

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  • 30 Currently reading

Published by National Aeronautics and Space Administration, National Technical Information Service, distributor in [Washington, DC, Springfield, Va .
Written in English

    Subjects:
  • Hubble Space Telescope,
  • High resolution,
  • Quasars,
  • Spectroscopy

  • Edition Notes

    Other titlesHigh resolution spectroscopy of quasars and quasar absorption line systems.
    StatementJ. Michael Shull.
    Series[NASA contractor report] -- NASA CR-204626.
    ContributionsUnited States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL17540920M
    OCLC/WorldCa38826098

    One option is also to compare the galaxy and stellar properties with estimates of the black hole mass using our own measurements based on spectral analysis. The quasar phenomenon is thought to be an early evolutionary phase of galaxies during which stars are forming and the black hole becomes active as it accretes matter. Paglione also studies the gamma-ray emission from starburst galaxies, which originates from their numerous supernovae and a cascade of particle reactions and high energy emission mechanisms. Answering these questions presents a major technological challenge owing to the enormous range of scales involved from the size of galaxies to the size of planets and the range of wavelengths over which observations must be made, from x rays for the hot gas in galactic disks to millimeter and submillimeter radiation for the cold gas and dust in protostellar disks.

    In the local Universe, galaxies in clusters are observed to be older and more evolved than galaxies in lower density regions. Dark matter does NOT interact with light. In a universe containing hundreds of billions of galaxies, most of which had active nuclei billions of years ago but only seen today, it is statistically certain that thousands of energy jets should be pointed toward the Earth, some more directly than others. However, observations of more distant planets, by photom- etry or gravitational microlensing, might provide statistical evidence regarding the frequency of occurrence of terrestrial planets. In practice, astronomers analyze the detailed motions of the stars in The Mice and quantitatively compare them to the motions of the stars in the simulations.

    ULXs have been suggested to not only play a crucial role in shaping the thermal evolution of the early universe, but also regulating, through their radiative and mechanical energy output, star-formation in dwarf galaxies and massive stellar clusters. All our knowledge is based upon deductions; astronomers do not, they cannot, make direct measurements of the matter in the universe. Such observations will enable resolved imaging of protostellar disks and inner envelopes in the nearest star-forming regions. This is one of the few problems in astronomy that is slightly helped by the high redshift, as despite these supernovae being fainter, relativistic time dilation means that the variability takes place over about a year.


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High-resolution spectroscopy of quasars and quasar absorption-line systems book

The most extreme GPs show the slowest velocities, which "are consistent with models for suppressed superwinds, which suggests that outflows may not be the only cause of LyC escape from galaxies.

What is the mass spectrum of dense cores, and what determines it? Its authors are Y. Indeed, quoting from Salzer et al. The intense production of ionizing ultraviolet radiation is also significant, as it would provide a mechanism for reionization to occur as galaxies form.

With high-resolution imaging from ground-based telescopes and the Hubble Space Telescopethe "host galaxies" surrounding the quasars have been detected in some cases. What is their relation with young clusters? Structure Function for the Damped Random Walk Model For our analysis, we express the long-term variability in terms of the SF in order to relate to our previous studies and to those of two-epoch samples.

For impossibly early galaxies, this would mean that at redshift the stellar mass is approximately a constant fraction of the halo mass, and at higher redshifts a greater and greater fraction of the mass of a halo ends up in stars.

The initial pattern of these fluctuations were also "frozen" into the temperature variations of the cosmic microwave background CMB light see image on the left, which is an all sky picture. Determine the large-scale three-dimensional structure of the interstellar medium and the star-for- mation regions within it.

These data were obtained in yearly "seasons" about 2—3 months long over the last decade and the cadence effectively samples timescales from days to years. Since the power-law slope of 1.

Pea galaxy

The luminosity and temperature of GL B, coupled with theoretical models, suggest a mass roughly 50 times that of Jupiter. To this end, the student will be trained in the analysis and interpretation of data obtained both by ground- and space-based telescopes and will gain experience and skills that are very useful both within many fields of astrophysics and outside.

What is the physical and chemical structure of a giant molecular cloud? The predictions are only statistical and the random nature reflects our uncertainty about the details of the physical processes.

Perez-Montero, J. In nearby star-forming regions, imaging at 10 milliarc see would reveal features as small as 1 AU and would permit direct observation of the disk-stellar wind interface region, gaps in disks owing to the presence of planets, and hot, young protoplanets. In a close related project, I was awarded additional time with X-Shooter, to study these massive dead galaxies with very high resolution by taking advantage of a beautiful effect called gravitational lensing.

A few different projects would be possible looking at different explanations that would be less exotic, with the goal of either finding a good solution or ruling out everything more mundane.

CUNY Astro Faculty

It is preferred that the students have good computational skills or are very interesting in coding. Galactic halos may also be replenished by the infall of gas from the intergalactic medium; observa- tions of quasar absorption lines suggest that galactic halos exist at high redshift and show evidence for massive- star nucleosynthesis.

Similarly, mid-infrared spectroscopy from ISO shows the great value of measuring astro- physical conditions in diffuse atomic and molecular gas. To set up the simulation, the galaxy masses, rotation directions and speeds, and approach vectors had to be estimated.

Quasars are believed—and in many cases confirmed—to be powered by accretion of material into supermassive black holes in the nuclei of distant galaxies, as suggested in by Edwin Salpeter and Yakov Zel'dovich.

Also, the viewing angle had to be chosen. A key disconnect between theory and observation of evolving galaxies at high redshift is that we observe luminous things a fraction of the baryons in a galaxy, yet the theory of galactic assembly makes predictions nearly exclusively about the dark matter which dominates the mass in the galactic halo.Get this from a library!

High-resolution spectroscopy of quasars and quasar absorption-line systems. [J Michael Shull; United States. National Aeronautics and Space Administration.]. Evolution and gravitational lensing in quasar absorption line systems. Pages Thomas, Peter A.

(et al.) Preview Buy Chapter 30,19 € Preliminary analysis of high-resolution spectra for UM A & B. Pages Smette, A. (et al.) First results on the spectroscopy of the arc-like object in Abell quasar absorption systems At redshifts zabs.2, quasar absorption-line constraints on space-time variations in the fine-structure constant, α, rely on the comparison of Mg and Fe transition wavelengths.

High resolution spectroscopy of absorption systems lyingCited by: High Resolution STIS/HST and HIRES/KECK Spectra of Three Weak Absorbers toward PG + Spectroscopy of the Ca II K Line of Metal-Poor Field Red Giants I.

QSO Absorption Lines

Southern A Review and Progress Report on The Search for Dust Obscured Quasar Absorption Line Systems. Churchill, C.W., & Steidel, C.C.ASSL Conf. Proc., V, The Quasar Absorption Line - Galaxy Evolution Group A GENERAL INTRODUCTION TO OUR SCIENCE AND METHODOLOGY Suitable for the Public with helpful external links (in red) Thank you for visiting, and welcome to our journey and quest to understand how galaxies form and evolve!

Abstract. In this paper we present an analysis of absorption-line variability in mini-BAL quasar LBQS + The Sloan Digital Sky Survey spectrum demonstrates that the absorption troughs can be divided into two components of blueshift velocities of ∼ and ∼ km .