Dynamics of Ringed Barred Spiral Galaxies. I. Surface Photometry and Kinematics of NGC 1433 and NGC 6300

AbstractPrevious optical surface photometry of barred spiral galaxies revealed that there are two distinct types of bars: large bars tend to have a nearly constant surface brightness (”flat“ bar), while smaller bars tend to have a decreasing surface brightness with a scale length similar to the disk (”exponential“ bar). Statistically, flat bars tend to occur in early Hubble types and exponential bars in later types. Studies of resonances in spirals indicate that flat bars end inside corotation, while exponential bars end between the inner Lindblad and 4:1 resonances. Near-infrared (JHK) surface photometry of bars is presented in order to compare the stellar distributions and bar potentials in flat and exponential barred galaxies. The presence of isophotal twists in some galaxies provides additional information on resonances. The grand design and fiocculent optical structures in the two types of barred galaxies will be compared and contrasted with their near-infrared light distributions.

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Multiband Photometry of NGC 7479 and NGC 7606

International Astronomical Union Colloquium ◽

10.1017/s0252921100049605 ◽

1996 ◽

Vol 157 ◽

pp. 123-125

Author(s):

A. M. Varela ◽

J. A. L. Aguerri ◽

M. Prieto ◽

C. Muñoz-Tuñón

Keyword(s):

Spiral Galaxies ◽

Three Dimensional ◽

Surface Photometry ◽

Dimensional Model ◽

Three Dimensional Model ◽

Isaac Newton ◽

La Palma ◽

Radial Profiles ◽

Isaac Newton Telescope ◽

Barred Spiral Galaxies

We present surface photometry in U BV RI passbands of the barred spiral galaxies NGC 7479 and NGC 7606, for which observations were obtained at the Cassegrain focus of the 2.5-m Isaac Newton Telescope at La Palma. Data are presented in the form of images and mean radial profiles from azimuthal fits of ellipses, giving the luminosity, ellipticities and position angles of the isophotes as functions of the galactocentric radii. Images in I-band are shown in Figure 1 of NGC 7479 (left) and NGC 7606 (right). These belong to a sample of galaxies with moderate circumnuclear starbursts. We are analyzing their structure to study the effects of departures from an axisymmetric potential for the dynamics of a galaxy. One objective of this study is to make a three-dimensional model of the bar and bulge using the method of photometric inversion. The sample consists of 27 spiral galaxies with and without a bar.

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6.10. The dust lanes of the barred galaxy NGC 5383

Symposium - International Astronomical Union ◽

10.1017/s007418090008493x ◽

1998 ◽

Vol 184 ◽

pp. 281-282

Author(s):

H.B. Ann ◽

J.M. Kim

Keyword(s):

Spiral Galaxies ◽

Surface Photometry ◽

Barred Galaxies ◽

The Galaxy ◽

Pattern Speed ◽

Dynamical Properties ◽

Barred Spiral Galaxies ◽

Shock Fronts

NGC 5383 is a barred galaxy of type (R′)SB(rs)b: pec with well developed dust lanes which provide valuable information about the dynamics of the galaxy. It is well known that dust lanes in barred spiral galaxies represent the loci of shock fronts which are caused by the gas inflow driven by bar potential (Athanassoula 1992). However, detailed morphology of dust lanes depends on the distribution of masses in bulge, disk, and bar as well as bar pattern speed. We conducted a UBVRI and Hα surface photometry and SPH simulations for NGC 5383 to investigate the relation between the morphology of dust lanes and the dynamical properties of barred galaxies.

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