A Counterrotating Central Component in the Barred Galaxy NGC 5728 | Zendy

Francisco Prada | Zendy; C. M. Gutiérrez | Zendy

AI Assistant Blog Pricing

Home ZAIA Blog

Open Access

A Counterrotating Central Component in the Barred Galaxy NGC 5728

Author(s) -

Francisco Prada,

C. M. Gutiérrez

Publication year - 1999

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/307199

Subject(s) - physics , astrophysics , surface brightness , stellar kinematics , galaxy , astronomy , photometry (optics) , radial velocity , kinematics , brightness , bar (unit) , barred spiral galaxy , lenticular galaxy , elliptical galaxy , stars , milky way , classical mechanics , meteorology

We present a detailed study of the stellar kinematics in the barred galaxyNGC 5728 based on I-band photometry and long-slit spectroscopic observations inthe region of the near-IR Ca II triplet. The analysis of the stellarline-of-sight velocity distribution (LOSVD) has revealed, in the centralregions of the bar, the presence of a cold (v/sigma~2.5) prograde $S$-shapedvelocity component that coexists in the central 4 kpc with a fainter and hotter(v/sigma~0.5) counterrotating component. Beyond 4 kpc from the nucleus theLOSVD shows the stellar bar kinematics. The comparison of the radial surfacebrightness profile of the velocity components with that obtained from an I-bandimage shows that the counterrotating core follows a r^(1/4) profile, while theS-shaped component does not follows the flat bar surface brightness profile.Several possible scenarios accounting for such kinematic signatures found inthe center of the bar in NGC 5728 are discussed.Comment: 11 pages, 8 figures, accepted for publication in Astrophysical Journa

The content you want is available to Zendy users.

Already have an account? Click here to sign in.

Having issues? You can contact us here

Accelerating Research