HCN Survey of Normal Spiral, Infrared‐luminous, and Ultraluminous Galaxies

2004 ◽  
Vol 152 (1) ◽  
pp. 63-80 ◽  
Author(s):  
Yu Gao ◽  
Philip M. Solomon
Keyword(s):  
Normal Spiral ◽  
Ultraluminous Galaxies

A Population of Hot, Dusty Ultraluminous Galaxies atz≈ 2

2004 ◽  
Vol 614 (2) ◽  
pp. 671-678 ◽  
Author(s):  
S. C. Chapman ◽  
Ian Smail ◽  
A. W. Blain ◽  
R. J. Ivison
Keyword(s):  
Ultraluminous Galaxies

scholarly journals Minibars in the Centers of Normal Galaxies

1996 ◽  
Vol 157 ◽  
pp. 207-211
Author(s):  
A. V. Zasov ◽  
O. K. Sil’chenko
Keyword(s):  
High Frequency ◽  
Spiral Galaxies ◽  
Velocity Fields ◽  
Frequency Of Occurrence ◽  
Gas Velocity ◽  
Ionized Gas ◽  
Normal Galaxies ◽  
Normal Spiral

AbstractAnalysis of ionized gas velocity fields in the circumnuclear regions of 13 normal spiral galaxies has shown that about half of them reveal a discrepancy between the kinematical axis at R < 2″ and the photometric or kinematical axes of the outer regions. This result indicates a high frequency of occurrence of non-axisymmetric gravitational potentials in the inner few hundred parsecs of galaxies. The possible nature of these minibars is discussed.

scholarly journals Zeeman splitting in OH megamasers

2007 ◽  
Vol 3 (S242) ◽  
pp. 467-470
Author(s):  
Timothy Robishaw ◽  
Carl Heiles ◽  
Eliot Quataert
Keyword(s):  
Emission Line ◽  
Zeeman Effect ◽  
Zeeman Splitting ◽  
Ultraluminous Galaxies

AbstractWe detected significant Zeeman splitting in the 1667 MHz OH megamaser emission from four ultraluminous galaxies. These detections, in addition to being the first extragalactic detection of the Zeeman effect in an emission line, suggest that OH megamasers are excellent extragalactic magnetometers.

Radio Radiation from Normal Spiral Galaxies

1967 ◽  
Vol 150 ◽  
pp. 413 ◽  
Author(s):  
Yervant Terzian
Keyword(s):  
Spiral Galaxies ◽  
Radio Radiation ◽  
Normal Spiral

Dense molecular gas and starbursts in ultraluminous galaxies

1992 ◽  
Vol 387 ◽  
pp. L55 ◽  
Author(s):  
P. M. Solomon ◽  
D. Downes ◽  
S. J. E. Radford
Keyword(s):  
Molecular Gas ◽  
Ultraluminous Galaxies

scholarly journals Preliminary note on the anatomy of the umbilical cord

1876 ◽  
Vol 24 (164-170) ◽  
pp. 417-440 ◽  
Keyword(s):  
Umbilical Cord ◽  
Human Umbilical Cord ◽  
Preliminary Note ◽  
Fixed Axis ◽  
The Subject ◽  
The Right ◽  
Black Sphere ◽  
Mechanical Arrangement ◽  
Normal Spiral ◽  
The Revolution

The peculiar twisted appearance of the human umbilical cord has received much attention from anatomists, and has been the subject of much ingenious speculation. According to Velpeau (‘ Embryologie’) the torsion begins as early as the seventh or eighth week, whilst Burdach has not observed it earlier than the tenth. I have repeatedly seen fœtuses, apparently of the twelfth and thirteenth week, in which no appearance of twisting was observable in the cord, though one of the most perfectly twisted cords in my possession belongs to a fœtus of certainly not more than thirteen weeks’ development. Velpeau attributes the twisting simply to the rotation of the fœtus. Schroeder Van der Kolk supposes that the blood flowing in the arteries exerts a backstroke influence on the pelvis of the swimming fœtus, thus determining its revolution in one direction or the other, as the arteries are to be found to the right or left of the vein. In order to dismiss this view we have only to recollect that the umbilicus could not in any way become a fixed axis, and that the mechanical arrangement of the heart, in the non-separation of its streams, would yield but a very weak impulse until very late in pregnancy. The revolution of the fœtus is not known to occur, though its occurrence is probable. Such revolution occurs in the spawn of the frog as early as the first segmentation of the black sphere; but then it is evidently the result of the necessity there is for an equal exposure of all parts of the embryo to the action of light and heat, just as the germinal spot is always uppermost in the bird’s egg. No such necessity exists in the persistently included mammalian ovum, and the revolution of the fœtus cannot be accepted. If it did occur it is highly improbable that the revolutions could number only from four to eighteen, these being the ranges I have noticed in a large number of fully developed cords. Another objection to Schroeder’s hypothesis is that, as a matter of fact, the arteries leave the omphalic ring nearly always below the vein and symmetrically arranged in relation to it. Their passage to one or other side of it is seldom apparent till the external dermal ring has been reached. Also I have seen the first revolution of the arteries pass from right to left, after which they suddenly bent on themselves and passed up the cord in an irregularly straight course, whilst the vein maintained the normal spiral. Further, I have seen the arteries reverse their course about the middle of the cord, though the vein maintained the uniform spiral.

scholarly journals NGC 4258: A Bent Jet in a Spiral Galaxy

1982 ◽  
Vol 97 ◽  
pp. 145-147
Author(s):  
R. H. Sanders
Keyword(s):  
Spiral Galaxy ◽  
Leading Edge ◽  
Continuum Emission ◽  
Spiral Arms ◽  
Western Side ◽  
Normal Spiral ◽  
The Continuum

The remarkable continuum arms in the spiral galaxy NGC 4258 are suggestive of some form of ejection from the nucleus of this galaxy (Van der Kruit, Oort and Mathewson, 1972). To summarize the observations (see Oort, Figure 2, this volume), the “anomalous spiral arms” are clearly distinct from the normal spiral arms, although wound in the same sense; there is a sharp gradient of the continuum emission on the leading edge of the arms, and an indication that the arms split on the western side; the arms go directly into the nucleus and coincide with Hα emitting filaments (Courtes, Viton and Veron, 1965).

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