The University of Tokyo · 물리·천문학
J. D. Silverman 교수의 연구실은 활성은하핵(AGN)과 초거대흑색구멍의 진화, 특히 X선 관측을 통한 AGN의 성질과 그 주변 환경, 특히 은하 간 상호작용과의 연관성을 중심으로 연구를 진행하고 있습니다. 주로 Chandra, XMM-Newton 등의 X선 망원경 데이터를 기반으로 고적색도 은하 및 AGN의 진화를 분석하며, 은하 형성과 AGN 활성화 간의 상관관계를 탐구합니다. 또한, 고해상도 스펙트럼을 활용한 은하의 가스 성분 및 금속성 분석을 통해 은하 진화의 물리적 메커니즘을 규명하고자 합니다.
표시된 성과는 수집된 데이터 기준으로 산출되며, 일부 차이가 있을 수 있습니다.
We present a measure of the hard (2-8 keV) X-ray luminosity function (XLF) of AGNs up to z ~ 5. At high redshifts, the wide area coverage of the Chandra Multiwavength Project is crucial to detect rare and luminous (LX > 1044 ergs s−1) AGNs. The inclusion of samples from deeper published surveys, such as the Chandra Deep Fields, allows us to span the lower LX range of the XLF. Our sample is selected from both the hard (z < 3, f2–8 keV > 6.3 × 10−16 ergs cm −2 s−1) and soft (z > 3, f0.
We present a study of the host galaxies of active galactic nucleus (AGN) selected from the zCOSMOS survey to establish if accretion onto supermassive black holes (SMBHs) and star formation are explicitly linked up to z ∼ 1. We identify 152 galaxies that harbor AGN, based on their X-ray emission (L0.5–10keV > 1042 erg s−1) detected by XMM-Newton observations of 7543 galaxies (iacs < 22.5). Star formation rates (SFRs), including those weighted by stellar mass, of a subsample are determined u
Close encounters between galaxies are expected to be a viable mechanism, as predicted by numerical simulations, by which accretion onto supermassive black holes can be initiated. To test this scenario, we construct a sample of 562 galaxies (M(*) > 2.5 x 10(10) M(circle dot)) in kinematic pairs over the redshift range 0.25 <z <1.05 that are more likely to be interacting than a well-matched control sample of 2726 galaxies not identified as being in a pair, both from the zCOSMOS 20k spectr
We present a spectroscopic survey of galaxies in the COSMOS field using the Fiber Multi-object Spectrograph (FMOS), a near-infrared instrument on the Subaru Telescope. Our survey is specifically designed to detect the Hα emission line that falls within the H-band (1.6–1.8 μm) spectroscopic window from star-forming galaxies with 1.4 < z < 1.7 and M_(stellar) ≳ 10^(10) M⊙. With the high multiplex capability of FMOS, it is now feasible to construct samples of over 1000 galaxies having spectro
We present the results of a program to acquire high-quality optical spectra of X-ray sources detected in the Extended-Chandra Deep Field-South (E-CDF-S) and its central 2 Ms area. New spectroscopic redshifts, up to z = 4, are measured for 283 counterparts to Chandra sources with deep exposures (t ~ 2-9 hr per pointing) using multi-slit facilities on both VLT (VIMOS) and Keck (DEIMOS), thus bringing the total number of spectroscopically identified X-ray sources to over 500 in this survey field. S
