DUST-CORRECTED COLORS REVEAL BIMODALITY IN THE HOST-GALAXY COLORS OF ACTIVE GALACTIC NUCLEI AT z ∼ 1

被引:69
作者
Cardamone, Carolin N. [1 ,2 ]
Urry, C. Megan [1 ,2 ,3 ]
Schawinski, Kevin [2 ,3 ]
Treister, Ezequiel [4 ]
Brammer, Gabriel [1 ]
Gawiser, Eric [5 ]
机构
[1] Yale Univ, Dept Astron, New Haven, CT 06511 USA
[2] Yale Univ, Yale Ctr Astron & Astrophys, New Haven, CT 06520 USA
[3] Yale Univ, Dept Phys, New Haven, CT 06520 USA
[4] Univ Hawaii, Inst Astron, Honolulu, HI 96822 USA
[5] Rutgers State Univ, Dept Phys & Astron, Piscataway, NJ 08854 USA
基金
美国国家科学基金会;
关键词
galaxies: active; galaxies: high-redshift; X-rays: galaxies; DEEP FIELD-SOUTH; YALE-CHILE MUSYC; SUPERMASSIVE BLACK-HOLES; X-RAY; STAR-FORMATION; MULTIWAVELENGTH SURVEY; PHOTOMETRIC REDSHIFTS; POPULATION SYNTHESIS; SOURCE CATALOGS; EVOLUTION;
D O I
10.1088/2041-8205/721/1/L38
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Using new, highly accurate photometric redshifts from the MUSYC medium-band survey in the Extended Chandra Deep Field-South (ECDF-S), we fit synthetic stellar population models to compare active galactic nucleus (AGN) host galaxies to inactive galaxies at 0.8 <= z <= 1.2. We find that AGN host galaxies are predominantly massive galaxies on the red sequence and in the green valley of the color-mass diagram. Because both passive and dusty galaxies can appear red in optical colors, we use rest-frame near-infrared colors to separate passively evolving stellar populations from galaxies that are reddened by dust. As with the overall galaxy population, similar to 25% of the "red" AGN host galaxies and similar to 75% of the "green" AGN host galaxies have colors consistent with young stellar populations reddened by dust. The dust-corrected rest-frame optical colors are the blue colors of star-forming galaxies, which imply that these AGN hosts are not passively aging to the red sequence. At z similar to 1, AGN activity is roughly evenly split between two modes of black hole growth: the first in passively evolving host galaxies, which may be heating up the galaxy's gas and preventing future episodes of star formation, and the second in dust-reddened young galaxies, which may be ionizing the galaxy's interstellar medium and shutting down star formation.
引用
收藏
页码:L38 / L42
页数:5
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