Faintest Galaxy Morphologies from $HST$ WFPC2 Imaging of the Hawaii Survey Fields

Lennox L. Cowie; Esther M. Hu; Antoinette Songaila

doi:10.1086/117631

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arXiv · astro-ph/9507055

Faintest Galaxy Morphologies from $HST$ WFPC2 Imaging of the Hawaii Survey Fields

Lennox L. Cowie·Esther M. Hu·Antoinette Songaila

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Abstract

We present very deep $HST$ WFPC2 images in the F814W filter of two Hawaii Survey fields, SSA13 and SSA22. Using these data with previous ground-based imaging and spectroscopy, we compare the colors, star-forming properties and morphologies of the faintest galaxies with a reference sample of bright nearby galaxies and analyze the changes in field galaxy morphology with magnitude. Our principal result is the identification of a new morphological class of ``chain'' galaxies at the faintest magnitudes. Based on limited spectroscopy, we tentatively conclude that these are linearly organized giant star-forming regions at $z = 0.5-3$ and, if this is correct, that these are large galaxies in the process of formation.

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Lennox L. Cowie, Esther M. Hu, Antoinette Songaila. 1995-07-14. Faintest Galaxy Morphologies from $HST$ WFPC2 Imaging of the Hawaii Survey Fields. https://doi.org/10.1086/117631

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