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 Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Galaxies detected in the 21-cm line of neutral hydrogen (HI) from theon-going Arecibo Legacy Fast ALFA (ALFALFA) blind extragalactic HI survey havebeen cross-correlated with Sloan Digital Sky Survey Data Release 7 (Abazajianet al. 2009) in order to define a reference sample of HI content in regions oflow galactic density. This observational sample will be used in the future toderive new standards of normal atomic gas content that allow a statisticalinvestigation of the HI properties of galaxies in differing environments of thelocal universe. As a previous step, we compare here morphological indicators,like color or light concentration index, of ALFALFA detections andnon-detections in low density regions. Our examination is extended also to asmall data set of isolated galaxies. This kind of analysis is necessary inorder to characterize as accurately as possible the type of galaxies thatALFALFA is detecting.

The Properties of Galaxies in Low Density Regions from the ALFALFA Survey