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Deep X-ray surveys by Chandra and XMM-Newton have resolved about 80% of the 2–10 keV cosmic ex-tragalactic X-ray background (CXRB) into point sources, the majority of which are obscured AGN. The ob-scuration might be connected to processes within the host galaxy, possibly the star-formation rate. Here, we use the results of CXRB synthesis calculations as(More)
We study the stellar and star formation properties of the host galaxies of 58 X-ray selected AGN in the GOODS portion of the Chandra Deep Field South (CDF-S) region at z ∼ 0.5 − 1.4. The AGN are selected such that their rest-frame UV to near-infrared spectral energy distributions (SEDs) are dominated by stellar emission, i.e., they show a prominent 1.6 µm(More)
Prior research has demonstrated the utility of metrics based on spatial velocity gradients to characterize and describe stream habitat, with higher gradients generally indicative of higher levels of physical heterogeneity and thus habitat quality. However, detailed velocity data needed to compute these metrics are difficult to obtain. Acoustic Doppler(More)
The relative entropy between the joint probability distribution of backward and forward sequences is used to quantify time asymmetry (or irreversibility) for stationary time series. The parallel with the thermodynamic theory of nonequilibrium steady states allows us to link the degree of asymmetry in the time signal with the distance from equilibrium and(More)
We present Spitzer/IRS mid-infrared spectra for 15 gravitationally lensed, 24 µm–selected galaxies, and combine the results with 4 additional very faint galaxies with IRS spectra in the literature. The median intrinsic 24 µm flux density of the sample is 130 µJy, enabling a systematic survey of the spectral properties of the very faint 24 µm sources that(More)
We present Spitzer Space Telescope imaging observations at 3.6, 4.5, 5.8, 8.0, and 24 m of the SCUBA submillimeter sources and Jy VLA radio sources in a 5 0 ; 5 0 area in the Lockman Hole East region. Out of the $40 SCUBA/ VLA sources in the field, Spitzer counterparts were detected for nearly all except for the few low-weight SCUBA detections. We show that(More)
We use a 24 µm selected sample containing more than 8,000 sources to study the evolution of star-forming galaxies in the redshift range from z = 0 to z ∼ 3. We obtain photometric redshifts for most of the sources in our survey using a method based on empirically-built templates spanning from ultraviolet to mid-infrared wavelengths. The accuracy of these(More)