Hubble Space Telescope imaging of a radio-quiet galaxy at redshift Z = 3.4

Details Hubble Space Telescope imaging of a radio-quiet galaxy at redshift Z = 3.4 Hubble Space Telescope imaging of a radio-quiet galaxy at redshift Z = 3.4

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...441l..13g&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 441, no. 1, p. L13-L16

Astronomy and Astrophysics

Astronomy

17

Active Galactic Nuclei, Big Bang Cosmology, Galactic Evolution, Lyman Alpha Radiation, Quasars, Spectral Energy Distribution, Star Formation, Starburst Galaxies, Ultraviolet Astronomy, Angular Resolution, Brightness Distribution, Cameras, Hubble Space Telescope, Red Shift, Spaceborne Astronomy, Stellar Luminosity

Scientific paper

We have observed with the Wide Field/Planetary Camera (WF/PC) on the Hubble Space Telescope (HST) a radio-quiet Ly alpha-emitting galaxy at redshift z = 3.428 (G2 below). The images probe the rest-frame UV light around 1250 A with an angular resolution of approx. = 0.1 sec, corresponding to 1.4 h-1,50 kpc at redshift z = 3.4 (in this Letter we use q0 = 0 and H0 = 50 h-1,50 km/s/Mpc). The light profile of the central approx. 10h-1,50 kpc region is well fitted by an r1/4 law with re approx. = 1.3 h-1,50 kpc, suggesting a dynamically relaxed state. The outer regions are characterized by the presence of substructures, such as an elongated formation and low surface brightness nebulosities. The isophotal analysis shows no evidence of an active galactic nuclei (AGN)-like unresolved source in the center. The structural properties of G2 are consistent with a dynamically hot stellar system observed during an early phase of star formation, very likely the progenitor of an elliptical or the bulge of a spiral galaxy.

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