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We established in an earlier study that articles listed at or near the top ofthe daily arXiv:astro-ph mailings receive on average significantly morecitations than articles further down the list. In our earlier work we were notable to decide whether this positional citation effect was due to authorself-promotion of intrinsically more citable papers or whether papers are citedmore often simply because they are at the top of the astro-ph listing. Usingnew data we can now disentangle both effects. Based on their submission timeswe separate articles into a self-promoted sample and a sample of articles thatachieved a high rank on astro-ph by chance and compare their citationdistributions with those of articles on lower astro-ph positions. We find thatthe positional citation effect is a superposition of self-promotion andvisibility bias.

Disentangling Visibility and Self-Promotion Bias in the arXiv:astro-ph Positional Citation Effect