نتایج جستجو برای: sfr
تعداد نتایج: 2025 فیلتر نتایج به سال:
We combine Spitzer 24 μm observations with data from the COMBO-17 survey for ∼15,000 0.2 < z ≤ 1 galaxies to determine how the average star formation rates (SFR) have evolved for galaxy sub-populations of different stellar masses. In the determination of we consider both the ultraviolet (UV) and the infrared (IR) luminosities, and account for the contributions of galaxies that are individ...
We study the star formation rate (SFR) as a function of environment for UV-selected Lyman break galaxies (LBGs) at redshift 3. From deep (μI,AB(sky) ≃ 27.6) UBV I KPNO 4-m/MOSAIC images, covering a total of 0.90 deg, we select 334 LBGs in slices 100h Mpc (co-moving) deep spanning the redshift range 2.9 < z < 3.4 based on Bayesian photometric redshifts that include the I magnitude as a prior. Th...
In this paper we focus our studies on LTE, which is a development under 3G technologies Release-8 of the 3GPP Project plan and is considered a baseline and step towards the LTE-Advanced. In orthogonal frequency division multiplexing networks, inter-cell interference results in poor performance, especially universal frequency reuse scheme has already been used. Soft Frequency Reuse (SFR) scheme,...
Integrating large amounts of wind power into power systems brings a large influence on the dynamic frequency response characteristic (DFRC). The traditional low-order system frequency response (SFR) model is no longer applicable at the current time. Based on the small signal analysis theory, a set of novel low-order SFR models for doubly-fed induction generator (DFIG) distributed wind power gen...
BACKGROUND Xerostomia (dry mouth) is a clinical symptom due to a number of factors, including Sjögren syndrome and radiation treatment to the head and neck region. It has been reported that acupuncture increases the salivary flow rate (SFR) in healthy subjects and in patients with xerostomia. A prognostic tool that would allow the care provider to identify patients who may respond to acupunctur...
We study the star formation rate (SFR) as a function of environment for UV selected Lyman break galaxies (LBGs) at redshift three. From deep (μI,AB(sky) ≃ 27.6) UBV I KPNO 4-m/MOSAIC images, covering a total of 0.90 deg, we select 334 LBGs in slices 100h Mpc (co-moving) deep spanning the redshift range 2.9 < z < 3.4 based on Bayesian photometric redshifts that include the I magnitude as a prior...
We present a model for nebular emission in star forming galaxies, which takes into account the effects of dust reprocessing. The nebular emissions (continuum emission, 54 H and He recombination lines and 60 nebular lines from UV to IR) have been computed with CLOUDY and then included into GRASIL, our spectrophotometric code specifically developed for dusty galaxies. The interface between nebula...
We present in this paper a detailed analysis of the effect of environment on the star–formation activity of galaxies within the Early Data Release (EDR) of the Sloan Digital Sky Survey (SDSS). We have used the Hα emission line to derive the star–formation rate (SFR) for each galaxy within a volume-limited sample of 8598 galaxies with 0.05 ≤ z ≤ 0.095 and M(r) ≤ −20.45. We find that the SFR of g...
We compare the SFR of single star-forming galaxies with the SFR of star-forming galaxies in pairs. Volume-limited samples are compared selected from the 2dFGRS, applying a maximum magnitude difference criterion. We show that SF galaxies in SF + SF pairs typically increase their SFR as they get fainter, whereas this does not happen for SF galaxies in mixed (SF + passive) pairs. And we provide ev...
Starting from the SFR per unit physical area, determined for DLAs using the C II method, we obtain the SFR per unit comoving volume at z ≈ 3. Pure warm neutral medium (WNM) solutions are ruled out since they generate more bolometric background radiation than observed, but the CNM-dominated two-phase solutions are consistent with the backgrounds. We find the SFR per unit comoving volume for DLAs...
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