HST IMAGES OF VERY COMPACT BLUE GALAXIES AT Z-SIMILAR-TO-0.2

Citation
Dc. Koo et al., HST IMAGES OF VERY COMPACT BLUE GALAXIES AT Z-SIMILAR-TO-0.2, The Astrophysical journal, 427(1), 1994, pp. 120000009
Citations number
25
Categorie Soggetti
Astronomy & Astrophysics
Journal title
ISSN journal
0004637X
Volume
427
Issue
1
Year of publication
1994
Part
2
Database
ISI
SICI code
0004-637X(1994)427:1<120000009:HIOVCB>2.0.ZU;2-2
Abstract
We present the results of 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'', corres ponding to approximately 1.4 h-1 kpc at redshifts z approximately 0.2. The average rest frame surface brightness within this diameter is mu( V) approximately 20.5 mag arcsec-2, approximately 1 mag brighter than that of typical late-type blue galaxies. Ground-based spectra show str ong, narrow emission lines indicating high ionization; their very blue colors suggest recent bursts of star-formation; their typical luminos ities are approximately 4 times fainter than that of field galaxies. T hese characteristics suggest H II galaxies as likely local counterpart s of our sample, though our most luminous targets appear to be unusual ly compact for their luminosities.