NO CLEAR SUBMILLIMETER SIGNATURE OF SUPPRESSED STAR FORMATION AMONG X-RAY LUMINOUS ACTIVE GALACTIC NUCLEI

作者：Harrison C M^*; Alexander D M; Mullaney J R; Altieri B; Coia D; Charmandaris V; Daddi E; Dannerbauer H; Dasyra K; Del Moro A; Dickinson M; Hickox R C; Ivison R J; Kartaltepe J; Le Floc' h E; Leiton R; Magnelli B; Popesso P; Rovilos E; Rosario D; Swinbank A M

来源：Astrophysical Journal Letters, 2012, 760(1): L15.

DOI：10.1088/2041-8205/760/1/L15

• galaxies: active
• galaxies: evolution
• galaxies: star formation
• X-rays: general

Many theoretical models require powerful active galactic nuclei (AGNs) to suppress star formation in distant galaxies and reproduce the observed properties of today%26apos;s massive galaxies. A recent study based on Herschel-SPIRE submillimeter observations claimed to provide direct support for this picture, reporting a significant decrease in the mean star formation rates (SFRs) of the most luminous AGNs (L-X %26gt; 10(44) erg s(-1)) at z approximate to 1-3 in the Chandra Deep Field-North (CDF-N). In this Letter, we extend these results using Herschel-SPIRE 250 mu m data in the COSMOS and Chandra Deep Field-South fields to achieve an order-of-magnitude improvement in the number of sources at L-X %26gt; 10(44) erg s(-1). On the basis of our analysis, we find no strong evidence for suppressed star formation in L-X %26gt; 1044 erg s(-1) AGNs at z approximate to 1-3. The mean SFRs of the AGNs are constant over the broad X-ray luminosity range of L-X approximate to 10(43)-10(45) erg s(-)1 (with mean SFRs consistent with typical star-forming galaxies at z approximate to 2; %26lt; SFRs %26gt; approximate to 100-200 M-circle dot yr(-1)). We suggest that the previous CDF-N results were likely due to low number statistics. We discuss our results in the context of current theoretical models.

• 出版日期2012-11-20
• 单位中国地震局