English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

With this study we aim at the spectroscopic verification of a photometricallyselected sample of Low Surface Brightness (LSB) galaxy candidates in a fieldaround the Hubble Deep Field-South (HDF-S). The sample helps to extend theparameter space for LSB galaxies to lower central surface brightnesses and toprovide better estimates on the volume densities of these objects. To deriveredshifts for the LSB candidates, long-slit spectra were obtained covering aspectral range from 3400{\AA} to 7500{\AA}. The observations have been obtainedusing the ESO 3.6m telescope, equipped with the EFOSC2 spectrograph. From themeasured radial velocities, distances could be estimated. With this distanceinformation, it is possible to differentiate between true LSB galaxies andhigher redshift High Surface Brightness (HSB) galaxies which may contaminatethe sample. A correction for the surface brightnesses can then be applied,accounting for the cosmological dimming effect (``Tolman Dimming''). We showthat ~70% of the LSB candidates, selected based on their location in thecolor-color space, are real LSB galaxies. Their position in the color-colordiagrams, therefore, indicate that the LSB galaxies have a different stellarpopulation mix resulting from a different star formation history compared toHSBs. Our LSB galaxy sample consists only of large disk galaxies withscale-length between 2.5kpc and 7.3kpc. We confirm the flat central surfacebrightness distribution of previous surveys and extend this distribution downto central surface brightnesses of 27 B mag arcsec^-2.

Low Surface Brightness Galaxies around the HDF-S: II. Distances and volume densities