共查询到20条相似文献，搜索用时 31 毫秒
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T. Jaakkola 《Astrophysics and Space Science》1977,49(1):99-111
82 compact galaxies with measured redshift present in systems containing partly normal galaxies have been found, using Zwicky's Catalogues and Morphological Catalogue. For them the mean residual redshift
has been obtained. The chance probability for this result is 0.015. A high frequency of compact galaxies among those with large discrepant redshift is remarked. Relatively compact normal galaxies also reveal a positive mean value of
. Redshift is correlated with magnitude in groups and pairs of compact galaxies, this depending in pairs on the linear separation and colours of the components. If a colour difference is present, the bluer member has the larger redshift in general. In contrast with the large luminosity deduced from the redshift for many field compacts, compact galaxies in systems are faint. The majority of the proposed associations between quasars and systems of normal galaxies are shown to be probably physical. 相似文献
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IR properties of Compact Group (CG) galaxies are presented and compared with IR properties of isolated galaxies. Despite CGs
displaying more E-S0s and optically bright galaxies, no differences are retrieved concerning FIR emission. The observed lack
of strong FIR enhancement in the CG sample is not surprising when interpreting FIR sources in CGs as accordant redshift projections,
rather than as mergers in progress.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
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H. Tiersch 《Astronomische Nachrichten》1976,297(6):301-303
The paper is a review of the most important phenomenological properties of the compact groups of compact galaxies (CCCGs) and the physical conditions of objects with well-known spectra. This paper contains a reference list of all CCCGs. 相似文献
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We use the data for the \(\text{H}\beta\) emission-line, far-ultraviolet (FUV) and mid-infrared 22 μm continuum luminosities to estimate star formation rates \(\langle \mbox{SFR} \rangle \) averaged over the galaxy lifetime for a sample of about 14000 bursting compact star-forming galaxies (CSFGs) selected from the Data Release 12 (DR12) of the Sloan Digital Sky Survey (SDSS). The average coefficient linking \(\langle \mbox{SFR} \rangle \) and the star formation rate \(\mbox{SFR}_{0}\) derived from the \(\text{H}\beta\) luminosity at zero starburst age is found to be 0.04. We compare \(\langle \mbox{SFR} \rangle \mbox{s}\) with some commonly used SFRs which are derived adopting a continuous star formation during a period of \({\sim}\,100~\mbox{Myr}\), and find that the latter ones are 2–3 times higher. It is shown that the relations between SFRs derived using a geometric mean of two star-formation indicators in the UV and IR ranges and reduced to zero starburst age have considerably lower dispersion compared to those with single star-formation indicators. We suggest that our relations for \(\langle \mbox{SFR} \rangle \) determination are more appropriate for CSFGs because they take into account a proper temporal evolution of their luminosities. On the other hand, we show that commonly used SFR relations can be applied for approximate estimation within a factor of \({\sim}\,2\) of the \(\langle \mbox{SFR} \rangle \) averaged over the lifetime of the bursting compact galaxy. 相似文献
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Toshiaki Ishizawa 《Astrophysics and Space Science》1986,119(1):221-225
Self-consistent simulations of seven groups of galaxies with halos have been performed to find a constraint upon the size of missing halos around spiral galaxies. An initial galaxy, which consists of 100 superstars, has half-mass radius 41 kpc and central velocity dispersion 235 km s–1. The simulations start from the epoch of maximum expansion. The initial conditions involve a variety of spatial distributions of galaxies, and the velocity dispersion of galaxies as would be permitted for maximum expansion. Dense groups having collapse times shorter than (2/3)H
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–1
are shown to form multiple mergers in a Hubble timeH
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. From a comparison of the frequencies of cD galaxies, or multiple mergers, in observed and simulated groups, it is concluded that the effective radius of missing halos is less than 41 kpc.Paper presented at the IAU Third Asian-Pacific Regional Meeting, held in Kyoto, Japan, between 30 September–6 October, 1984. 相似文献
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D. Kunth 《Astrophysics》1995,38(4):329-334
I review the importance of blue compact galaxies with respect to current studies of massive star formation, abundances of elemental and heavy elements in the interestellar medium, and to the epoch of galaxy formation. Their relevance to cosmological studies will be emphasized.Published in Astrofizika, Vol. 38, No. 4, pp. 593–602, October–December, 1995. 相似文献
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R. A. Vardanian 《Astrophysics》1996,39(4):346-350
It is shown that the brightest members of elongated, compact groups of compact galaxies (CGCGs) are located not in the central part of a group but at its edge. This suggests that compact groups of compact galaxies (n>8) have a cometary shape, with their opening angle being less than 60°, for the most part.Translated from Astrofizika, Vol. 39, No. 4, pp. 585–592, October–December, 1996. 相似文献