Galaxies with rows

Chernin, A. D.; Kravtsova, A. S.; Засов, А. В.; Архипова, В. П.

doi:10.1134/1.1416272

Cited by 13 publications

(62 citation statements)

References 1 publication

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“…Furthermore, in the galaxy M51 with its almost perfect disc‐wide polygonal arms, the angles between straight segments are near 120°. The same is observed in M101 (Waller et al 1997), in other spirals (Chernin et al 2000a) and also in quasi‐regular hexagonal disc‐wide rings (Chernin et al 2000b). As described in Section 2, this characteristic angle has also been found in examples of the nuclear structures.…”

Section: Discussionsupporting

confidence: 76%

“…The nuclear structures of Section 2 have a clear analogy in the large‐scale structures of disc galaxies. The nuclear spiral straight segments may be considered to be counterparts to disc‐wide rows (Vorontsov‐Vel'yaminov 1987) and polygonal arms (Chernin 1999; Chernin et al 2000a). The ring with straight segments may be considered to be a counterpart to the disc‐wide hexagonal ring discovered by de Vaucouleurs (1970) in NGC 4303; in his words, ‘the inner pseudo‐ring – almost a hexagon – is formed by straight segments of three main spiral arms in NGC 4303’.…”

Section: Discussionmentioning

confidence: 99%

“…In this Letter, I show that Hubble Space Telescope images enable the identification of straight arm segments in nuclear spirals. It seems reasonable to consider these features as counterparts to the rows in disc‐wide spirals and polygonal arms studied by Vorontsov‐Vel'yaminov (1987), Chernin (1999) and Chernin et al (2000a).…”

Section: Introductionmentioning

confidence: 94%

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Using Hubble Space Telescope images to identify straight segments in galaxy nuclear spirals

Chernin¹

2000

Monthly Notices of the Royal Astronomical Society

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This Letter reports the discovery of straight segments of nuclear spiral arms. Hubble Space Telescope images of Seyfert galaxies are used. The morphology of the straight features on scales of few hundred parsecs proves to be similar to the morphology of disc‐wide polygonal spirals and rings. This suggests that the straight structures on both nuclear and disc scales may have a common physical nature.

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Section: Discussionsupporting

confidence: 76%

Section: Discussionmentioning

confidence: 99%

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Using Hubble Space Telescope images to identify straight segments in galaxy nuclear spirals

Chernin¹

2000

Monthly Notices of the Royal Astronomical Society

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“…If one looks carefully, in many cases, what seems at the first glance to be a logarithmic spiral arm is better approached by a sequence of straight segments with an angle between them (examples are M101, NGC 1232 and M51). Chernin et al (2001) present a list of a large number of galaxies with such ‘polygonal’ structures, which include some of the nearest and best known spirals. Chernin (1999) explains the straight portions as local flattening of the shock fronts that happens because a flat shock is a more stable configuration than a curved one.…”

Section: Resultsmentioning

confidence: 99%

The spiral structure of the Galaxy revealed by CS sources and evidence for the 4:1 resonance

Lépine

Roman-Lopes

Abraham

et al. 2011

Monthly Notices of the Royal Astronomical Society

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We present a map of the spiral structure of the Galaxy, as traced by molecular carbon monosulphide (CS) emission associated with IRAS sources which are believed to be compact H ii regions. The CS line velocities are used to determine the kinematic distances of the sources in order to investigate their distribution in the galactic plane. This allows us to use 870 objects to trace the arms, a number larger than that of previous studies based on classical H ii regions. The distance ambiguity of the kinematic distances, when it exists, is solved by different procedures, including the latitude distribution and an analysis of the longitude–velocity diagram. The study of the spiral structure is complemented with other tracers: open clusters, Cepheids, methanol masers and H ii regions. The well‐defined spiral arms are seen to be confined inside the corotation radius, as is often the case in spiral galaxies. We identify a square‐shaped sub‐structure in the CS map with that predicted by stellar orbits at the 4:1 resonance (four epicycle oscillations in one turn around the galactic centre). The sub‐structure is found at the expected radius, based on the known pattern rotation speed and epicycle frequency curve. An inner arm presents an end with strong inwards curvature and intense star formation that we tentatively associate with the region where this arm surrounds the extremity of the bar, as seen in many barred galaxies. Finally, a new arm with concave curvature is found in the Sagitta to Cepheus region of the sky. The observed arms are interpreted in terms of perturbations similar to grooves in the gravitational potential of the disc, produced by crowding of stellar orbits.

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“…Note that these results are based on an analysis of photographic plates and Palomar Atlas images. In this paper we report the results of an analysis of our catalog of galaxies with polygonal structures, which lists 276 objects not included into the earlier published catalog [3]. When combined, these catalogs include all NGC and IC galaxies with "rows".…”

Section: Straight-line Segments Can Be Subdividedmentioning

confidence: 99%

Galaxies with “rows”: A new catalog

Butenko¹,

Хоперсков²

2017

Astrophys. Bull.

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Galaxies with "rows" in Vorontsov-Velyaminov's terminology stand out among the variety of spiral galactic patterns. A characteristic feature of such objects is the sequence of straightline segments that forms the spiral arm. In 2001 A. Chernin and co-authors published a catalog of such galaxies which includes 204 objects from the Palomar Atlas. In this paper, we supplement the catalog with 276 objects based on an analysis of all the galaxies from the New General Catalogue and Index Catalogue. The total number of NGC and IC galaxies with rows is 406, including the objects of . The use of more recent galaxy images allowed us to detect more "rows" on average, compared with the catalog of Chernin et al. When comparing the principal galaxy properties we found no significant differences between galaxies with rows and all S-typeNGC/IC galaxies.We discuss twomechanisms for the formation of polygonal structures based on numerical gas-dynamic and collisionless Nbody calculations, which demonstrate that a spiral pattern with rows is a transient stage in the evolution of galaxies and a system with a powerful spiral structure can pass through this stage. The hypothesis of A. that the occurrence frequency of interacting galaxies is twice higher among galaxies with rows is not confirmed for the combined set of 480 galaxies. The presence of a central stellar bar appears to be a favorable factor for the formation of a system of "rows".

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Galaxies with rows

Cited by 13 publications

References 1 publication

Using Hubble Space Telescope images to identify straight segments in galaxy nuclear spirals

Using Hubble Space Telescope images to identify straight segments in galaxy nuclear spirals

The spiral structure of the Galaxy revealed by CS sources and evidence for the 4:1 resonance

Galaxies with “rows”: A new catalog

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