The Gunners secured their 13th win in 19 outings thanks to Olivier Giroud's 65th-minute header from a Theo Walcott free-kick for his eighth of the campaign.
Sitting on 41 points, just one behind Arsenal, are premiership favourites Manchester City who are on a winning run of four and an unbeaten streak of eight after edging Crystal Palace 1-0 at the Etihad Stadium on Saturday.
Edin Dzeko scored the only goal of the match when slotting home Jesus Navas' low cross in the 66th minute.
Elsewhere, Manchester United made it four wins in a row when edging Norwich City 1-0 at Carrow Road thanks to Danny Welbeck's second-half goal, Aston Villa and Swansea City drew 1-1 at Villa Park as bottom-of-the-table Sunderland scored twice late to force a 2-2 draw at Cardiff City.
19th-placed West Ham United twice blew a lead to be held to a 3-3 draw by West Bromwich Albion in a fascinating encounter highlighted by a brace from Nicolas Anelka, Hull City turned it on with an emphatic 6-0 demolition job of Fulham at the KC Stadium to move to tenth as seventh-placed Tottenham recorded their first home win in five outings by comfortably accounting for Stoke City 3-0.
2013/14 Barclays Premier League scores
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