English media announced that the London club paid around 56 million pounds ($79.2 million), overshadowing the 46.5 million pounds spent a year ago to arrive striker Alexandre Lacazette from French side Olympique Lyonnais.
Aubameyang interfaces up with previous Dortmund partner Henrikh Mkhitaryan after the Armenia midfielder joined the Gunners from Manchester United a week ago, with Chile forward Alexis Sanchez going the other way.
Aubameyang, who scored 98 objectives in 144 Bundesliga recreations for Dortmund, communicated his pleasure at the arrangement and his expectation of copying Arsenal's record goalscorer Thierry Henry.
"I'm glad to be here in this extraordinary group," Aubameyang told the club's site.
"I think the club have such a major history with awesome players like Thierry Henry, so it's a case for us strikers... he was quick and scored a considerable measure of objectives. I need to work to resemble him, yet I will do."
A cool finisher like previous France worldwide Henry, Aubameyang will include speeding up, control and a measurements of capriciousness to Arsenal's assault.
Aubameyang is best as a solitary focus forward however with Lacazette right now possessing that position, it stays to be checked whether Arsenal director Arsene Wenger will change his arrangement to suit the two advances.
Should Lacazette get approval to lead the line in front of his new partner, Aubameyang has appeared in the past that he is equipped for alarming protectors from the wings.
Aubameyang, 28, is Gabon's record goalscorer with 23 objectives from 56 coordinates and was named the African Footballer of the Year in 2015. He was named Bundesliga player of the year in 2016 and last season was the class' best scorer with 31 objectives.
"Aside from the unremarkable aftereffects of the most recent couple of weeks, we can recall that Pierre-Emerick Aubameyang's history with BVB has been an example of overcoming adversity for over four years," said Borussia Dortmund's donning chief Michael Zorc.
Dortmund consented to the deal as it surrounded a credit bargain for Chelsea's Belgian striker Michy Batshuayi.
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