HST images of very compact blue galaxies at Z approximately 0.2

Details HST images of very compact blue galaxies at Z approximately 0.2 HST images of very compact blue galaxies at Z approximately 0.2

May 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...427l...9k&link_type=abstract

Astrophysical Journal, Part 2 - Letters, vol. 427, no. 1, p. L9-L12

Astronomy and Astrophysics

Astrophysics

71

Blue Stars, Compact Galaxies, Cosmology, Galactic Evolution, Galactic Structure, Images, Ionization, Red Shift, Starburst Galaxies, Stellar Luminosity, Astronomical Observatories, Cameras, Hubble Space Telescope, Isophotes, Spectral Resolution, Spectroscopic Telescopes, Wide Angle Lenses

Scientific paper

We present the results of Hubble Space Telescope (HST) Wide-Field Camera (WFC) imaging of seven very compact, very blue galaxies with B less than or equal to 21 and redshifts z approximately 0.1 to 0.35. Based on deconvolved images, we estimate typical half-light diameters of approximately 0.65 sec, corresponding to approximately 1.4 h-1 kpc at redshifts z approximately 0.2. The average rest frame surface brightness within this diameter is muv approximately 20.5 mag arcsec-2, approximately 1 mag brighter than that of typical late-type blue galaxies. Ground-based spectra show strong, narrow emission lines indicating high ionization; their very blue colors suggest recent bursts of star-formation; their typical luminosities are approximately 4 times fainter than that of field galaxies. These characteristics suggest H II galaxies as likely local counterparts of our sample, though our most luminous targets appear to be unusually compact for their luminosities.

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