Főoldal     Alapinformációk     To Survive in the Universe    
Inhabited Sky
    News@Sky     Asztrofotók     Kollekció     Fórum     Blog New!     GYIK     Sajtó     Bejelentkezés  

HD 79911


Tartalom

Képek

Kép feltöltése

DSS Images   Other Images


Kapcsolódó cikkek

Observations of the dynamics of eight early-type galaxies
Measurements of the velocity dispersion profiles and rotation curves ofone lenticular and seven elliptical galaxies are presented. Long-slitspectra along the major axes of the eight early-type galaxies covering arange of ellipticities were obtained in the range 5000 to 6000 A, andcalibrated for small-scale sensitivity variations, sky brightness andwavelength and intensity; velocities and velocity dispersions weremeasured using direct and Fourier techniques. Estimates of the velocitydispersion and rotation velocities made by the two methods are shown tobe in good agreement, and the low rotation velocities found by otherauthors are confirmed. All the galaxies are observed to exhibitdecreasing or constant values of the velocity dispersion with increasingradius. Examination of the velocity dispersion profiles of the galaxiesreveals those galaxies with dispersion profiles falling more steeplythan predicted by isotropic models to be dominated by radial motions atlarge radii, and those with flat dispersion profiles to be easilyinterpreted in terms of increasing mass-to-light ratio with radius.Detailed descriptions of the dynamical properties of individual galaxiesare also presented.

Spectroscopic observations of three elliptical galaxies
Spectroscopic observations of NGC 4472, NGC 5813, and IC 4296 arereported. Rotation curves, velocity dispersion profiles, and linestrength profiles were obtained by a Fourier quotient method and a crosscorrelation method. NGC 4472 and NGC 5813 are found to rotate slowly,which provides additional support for the hypothesis that the shapes ofelliptical galaxies are due to velocity anisotropies rather than torotation. IC 4296 rotates quite rapidly, which is consistent withisotropic oblate models.

Új cikk hozzáadása


Kapcsolódó hivatkozások

  • - (nincs kapcsolódó hivatkozás) -
Új link hozzáadása


Besorolás csoportokba:


Pozíciós és asztrometriai adatok

Csillagkép:Északi Vízikígyó
Rektaszcenzió:09h16m42.85s
Deklináció:-06°42'56.8"
Vizuális fényesség:8.369
Távolság:952.381 parszek
RA sajátmozgás:-15.6
Dec sajátmozgás:-26.7
B-T magnitude:9.994
V-T magnitude:8.504

Katalógusok és elnevezések:
Megfelelő nevek   (Edit)
HD 1989HD 79911
TYCHO-2 2000TYC 4892-548-1
USNO-A2.0USNO-A2 0825-06797001
HIPHIP 45530

→ További katalógusok és elnevezések lekérése VizieR-ből