نتایج جستجو برای: galaxy
تعداد نتایج: 58145 فیلتر نتایج به سال:
We simulate the accretion of high-density dwarf galaxies by low-density giant galaxies, using models that contain both power-law central density cusps and central point masses representing supermassive black holes. The final density profiles of the merger remnants are always similar to the initial density profile of the giant galaxy, for two reasons. 1. The density of the dwarf galaxy is reduce...
We report on the discovery of a new potential galaxy threshing system in the COSMOS 2 square degree field using the prime-focus camera, Suprime-Cam, on the 8.2 m Subaru Telescope. This system consists of a giant elliptical galaxy withMV 21:6 and a tidally disrupted satellite galaxy withMV 17:7 at a photometric redshift of z 0:08. This redshift is consistent with the spectroscopic redshift of 0....
A recent study suggests that the quasar HE 0450−2958 is hosted by a galaxy substantially fainter than that inferred from the correlation between black hole mass and bulge luminosity. As this result has significant bearings on galaxy and black hole evolution, we revisit the issue by performing an independent analysis of the data, using a two-dimensional image fitting technique. We indeed find no...
Aims. We study galaxy clustering and explore the dependence of galaxy properties on the the environment up to a redshift z ∼1, on the basis of a deep multi-band survey in the Chandra Deep Field South. Methods. We have developed a new method which combines galaxy angular positions and photometric redshifts to estimate the local galaxy number-density. This allows both the detection of overdensiti...
We propose that structural, kinematical, and chemical properties of the Galactic globular clusters (GCs) can contain fossil information of the cosmic reionization history. We first summarize possible observational evidences for the influence of reionization on the Galactic GC formation. We then show how structural properties of the GC system (GCS) in the Galaxy can be influenced by suppression ...
Hubble Space Telescope images of the galaxy merger Tadpole (VV29=Arp 188=UGC 10214) are interpreted using the hydro-gravitational theory of Gibson 1996-2000 that predicts galaxy masses within about 100 kpc (3.1×10 m) should be dominated by dark halos of primordial-fog-particles (PFPs) in dark protoglobular-star-clusters (PGCs), a cosmology supported by the quasar microlensing observations and i...
Using a simple model of molecular cloud evolution, we have quantitatively estimated the change of star formation rate (SFR) of a disk galaxy falling radially into the potential well of a cluster of galaxies. The SFR is affected by the ram-pressure from the intracluster medium (ICM). As the galaxy approaches the cluster center, the SFR increases to twice the initial value, at most, in a cluster ...
We present HST/WFPC2 images in Hα+[N II]λλ6548,6583 lines and continuum radiation and a VLA map at 8 GHz of the H2O gigamaser galaxy TXS2226-184. This galaxy has the most luminous H2Omaser emission known to date. Our red continuum images reveal a highly elongated galaxy with a dust lane crossing the nucleus. The surface brightness profile is best fitted by a bulge plus exponential disk model, f...
We demonstrate how the properties of a galaxy depend on the mass of its host dark matter subhalo, using two independent models of galaxy formation. For the cases of stellar mass and black holemass, themedian property value displays amonotonic dependence on subhalomass. The slope of the relation changes for subhalomasses for which heating by active galactic nuclei becomes important. The median p...
Ring galaxies are specific types of interacting galaxies in which a smaller galaxy has passed through the center of the disk of another larger galaxy. The intrusion of the smaller galaxy causes the structure of the larger galaxy to compress as the smaller galaxy falls through, and to recoil back after the smaller galaxy passes through, hence the ring-like shape. In our research, we studied the ...
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