نتایج جستجو برای: cluster of galaxy
تعداد نتایج: 21184710 فیلتر نتایج به سال:
We have measured the equivalent width of the Hα emission line for 11006 galaxies brighter than Mb = −19 (ΩΛ = 0.7, Ωm = 0.3, H0 = 70 km s Mpc) at 0.05 < z < 0.1 in the 2dF Galaxy Redshift Survey (2dFGRS), in the fields of seventeen known galaxy clusters. The limited redshift range ensures that our results are insensitive to aperture bias, and to residuals from night sky emission lines. We use t...
We present evidence for a Spitzer-selected luminous infrared galaxy (LIRG) behind the Bullet Cluster (1E0657-56). The galaxy, originally identified in IRAC photometry as a multiply imaged source, has a spectral energy distribution consistent with a highly extincted (AV ∼ 3.3), strongly star-forming galaxy at z ∼ 2.7. Our strong gravitational lensing analysis of the cluster indicates that the ma...
In this study, 1200 images and catalogues of M33 spiral galaxy taken by WFCAM camera at UKIRT telescope in J, H and K bands. Cross correlation methods were employed to identify stars in overlapping regions from among images taken in different dates. Careful astrometric and photometric analysis was made to calibrate stellar positions and magnitudes using their 2MASS near infra red survey. The fi...
We present the galaxy cluster autocorrelation function of 277 galaxy cluster candidates with 0.25 ≤ z ≤ 1.5 in a 7 deg2 area of the IRAC Shallow Cluster Survey. We find strong clustering throughout our galaxy cluster sample, as expected for these massive structures. Specifically, at 〈z〉 = 0.5 we find a correlation length of r0 = 17.40+3.98 −3.10 h −1 Mpc, in excellent agreement with the Las Cam...
The orbital decay and tidal disruption of a star cluster in a galaxy is studied in an analytical manner. Owing to dynamical friction, the star cluster spirals in toward the center of the galaxy. Simultaneously, the galactic tidal field strips stars from the outskirts of the star cluster. Under an assumption that the star cluster undergoes a self-similar evolution, we obtain the condition and ti...
We present recent results on the evolution of the colour-magnitude relation and of the star formation activity in galaxy clusters since z ∼ 0.8. Results are based on the ESO Distant Cluster Survey (EDisCS) an ESO large programme aimed at the study of cluster structure and cluster galaxy evolution over a significant fraction of cosmic time and are discussed in the framework of the current standa...
We present the Palomar Transient Factory discoveries and the photometric and spectroscopic observations of PTF11kmb and PTF12bho. We show that both transients have properties consistent with the class of calcium-rich gap transients, specifically lower peak luminosities and rapid evolution compared to ordinary supernovae, and a nebular spectrum dominated by [Ca II] emission. A striking feature o...
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