In a surprise announcement, Bill Keller is resigning as New York Times executive editor as of September 6. He will be replaced by Jill Abramson, the paper’s managing editor, Jeremy Peters reported on nytimes.com Thursday morning . Keller will still write for the paper: “As for Mr. Keller’s plans, he said he was still working out the details of a column he will write for the paper’s new Sunday opinion section, which will be introduced later this month.” Abramson will be the first woman to run the Times newsroom in the paper’s 160-year history. For Abramson, the Times is holy writ: Ms. Abramson said that as a born-and-raised New Yorker, she considered being named editor of The Times to be like “ascending to Valhalla.”