نتایج جستجو برای: active galaxy
تعداد نتایج: 491329 فیلتر نتایج به سال:
We present the first near-infrared (K′-band) homogeneous observations of a complete sub-sample of the 3CR radio catalogue comprising all High Excitation Galaxies (HEGs) at z <0.3. After showing that the surface brightness decomposition technique to measure central point-like sources is affected by significant uncertainties for the objects in the studied sample, we present a new, more accurate m...
We calculated the median values of the following parameters for 87 groups of galaxies with three to eight components: the mean rms velocity of the galaxies in the group, Sv = 166 km/s; the harmonic mean radius, Rh = 29 kpc; and the mass-to-light ratio, Mvir/L = 33M⊙/L⊙. The Mvir/L ratio depends on the population of the system, while Sv does not depend on Rh. To ascertain the relationship betwee...
The infrared bright galaxy 0421 +040P06 detected by IRAS at 25 and 60 μm has been studied at optical, infrared, and radio wavelengths. It is a luminous galaxy with apparent spiral structure emitting 4 x 1037 W (1 x 1011 L 0 ) from far-infrared to optical wavelengths, assuming H 0 = 75 km s1 Mpc1• Optical spectroscopy reveals a Seyfert 2 emission-line spectrum, making 0421 +040P06 the first acti...
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...
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