  Understanding why researchers cite each other has been a longstanding
conjecture in studying scientific networks. Prior research suggests relevance,
group cohesion, or honest source crediting as possible factors. However, the
dual nature of cognitive and social dimensions underlying citation is often
overlooked by not considering the intermediary steps leading up to a citation.
For one work to be cited by another, it must first be published by a set of
authors. Therefore, we investigate the reasons behind researchers' citations,
explicitly examining the interplay of socio-cognitive ties through the
interdependence of coauthorship and citation networks. We assess our claims in
an empirical analysis by employing the Author-Oriented Relational HyperEvent
Model (AuthRHEM) to study Chilean astronomers' citation and collaboration
behavior between 2013 and 2015 in a joint framework. We find evidence that when
deciding which work to cite, authors prefer other work with novelty and
cognitive ties, such as work-to-work relations. At the same time, coherent
groups are relevant because coauthors are cocited more frequently in subsequent
publications.
