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

We present Spitzer Space Telescope photometry of 18 Sloan Digital Sky Survey(SDSS) quasars at 2.7 <= z <= 5.9 which have weak or undetectablehigh-ionization emission lines in their rest-frame ultraviolet (UV) spectra(hereafter weak-lined quasars, or WLQs). The Spitzer data are combined withSDSS spectra and ground-based, near-infrared (IR) photometry of these sourcesto produce a large inventory of spectral energy distributions (SEDs) of WLQsacross the rest-frame ~0.1-5 mum spectral band. The SEDs of our sources areinconsistent with those of BL Lacertae objects which are dominated bysynchrotron emission due to a jet aligned close to our line-of-sight, but areconsistent with the SED of ordinary quasars with similar luminosities andredshifts that exhibit a near-to-mid-IR 'bump', characteristic of hot dustemission. This indicates that broad emission lines in WLQs are intrinsicallyweak, rather than suffering continuum dilution from a jet, and that suchsources cannot be selected efficiently from traditional photometric surveys.

The Ultraviolet-to-Mid-Infrared Spectral Energy Distribution of Weak Emission Line Quasars