Model rotation curves of disk galaxies oriented at an arbitrary angle to the plane of the sky

Stepanova, K. V.; Волков, Е. В.

doi:10.1134/s1063773713070062

Cited by 4 publications

(3 citation statements)

References 3 publications

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“…Optical RCs of edge-on galaxies are strongly suffered by internal absorption which changes their shapes (e.g. Bosma et al 1992, Zasov & Khoperskov 2003, Stepanova & Volkov 2013. However, our RCs are sufficiently extended (mean extension of the curves is (0.80 ± 0.19) a, where a is a semi-major axis of the galaxy, see Table 1) to estimate rotational velocities and to check the Tully-Fisher (TF) relation for the sample galaxies.…”

Section: Kinematical Characteristics Of Galaxiesmentioning

confidence: 93%

Galaxies with conspicuous optical warps

Решетников

Mosenkov

Моисеев

et al. 2016

Mon. Not. R. Astron. Soc.

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In this paper, we present results of a photometric and kinematic study for a sample of 13 edge-on spiral galaxies with pronounced integral-shape warps of their stellar discs. The global structure of the galaxies is analyzed on the basis of the Sloan Digital Sky Survey (SDSS) imaging, in the g, r and i passbands. Spectroscopic observations are obtained with the 6-m Special Astrophysical Observatory telescope. In general, galaxies of the sample are typical bright spiral galaxies satisfying the Tully-Fisher relation. Most of the galaxies reside in dense spatial environments and, therefore, tidal encounters are the most probable mechanism for generating their stellar warps. We carried out a detailed analysis of the galaxies and their warps and obtained the following main results: (i) maximum angles of stellar warps in our sample are about 20 o ; (ii) warps start, on average, between 2 and 3 exponential scale lengths of a disc; (iii) stronger warps start closer to the center, weak warps start farther; (iv) warps are asymmetric, with the typical degree of asymmetry of about several degrees (warp angle); (v) massive dark halo is likely to preclude the formation of strong and asymmetric warps.

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Section: Kinematical Characteristics Of Galaxiesmentioning

confidence: 93%

Galaxies with conspicuous optical warps

Решетников

Mosenkov

Моисеев

et al. 2016

Mon. Not. R. Astron. Soc.

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“…A major concern is that the integration along the line-of-sight can have a dramatic effect on the derived rotation curve. This effect leads to a marked discrepancy between the rotation curve and the circular velocity curve especially in the inner part of a galaxy (Zasov & Khoperskov 2003;Stepanova & Volkov 2013). As a result the scheme needs the restoration of the rotation curve (Di Teodoro & Fraternali 2015) and more or less robust parametrization of σ R (R) (Kregel et al 2005).…”

Section: Introductionmentioning

confidence: 99%

Reconstructing the velocity dispersion profiles from the line-of-sight kinematic data in disc galaxies

Marchuk

Sotnikova

2016

Mon. Not. R. Astron. Soc.

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We present a modification of the method for reconstructing the stellar velocity ellipsoid (SVE) in disc galaxies. Our version does not need any parametrization of the velocity dispersion profiles and uses only one assumption that the ratio σ z /σ R remains constant along the profile or along several pieces of the profile. The method was tested on two galaxies from the sample of other authors and for the first time was applied to three lenticular galaxies NGC 1167, NGC 3245 and NGC 4150 as well as to one Sab galaxy NGC 338. We found that for galaxies with a high inclination (i > 55 − 60• ) it is difficult or rather impossible to extract the information about SVE while for galaxies at an intermediate inclination the procedure of extracting is successful. For NGC 1167 we managed to reconstruct SVE, provided that the value of σ z /σ R is piecewise constant. We found σ z /σ R = 0.7 for the inner parts of the disc and σ z /σ R = 0.3 for the outskirts. We also obtained a rigid constrain on the value of the radial velocity dispersion σ R for highly inclined galaxies and tested the result using the asymmetric drift equation, provided that the gas rotation curve is available.

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“…It should be noticed that for large inclination we need to account for the line-of-sight integration of the DF when determining rotation velocities. We did not make any reduction of data because for i < 60 • the distortion of the rotation curve for R > h is minimal (Stepanova & Volkov 2013).…”

Section: Non-constant α Model For Ngc 1167mentioning

confidence: 99%

Reconstructing the velocity dispersion profiles from the line-of-sight kinematic data in disc galaxies

Marchuk,

Sotnikova

2017

Preprint

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We present a modification of the method for reconstructing the stellar velocity ellipsoid (SVE) in disc galaxies. Our version does not need any parametrization of the velocity dispersion profiles and uses only one assumption that the ratio σ z /σ R remains constant along the profile or along several pieces of the profile. The method was tested on two galaxies from the sample of other authors and for the first time was applied to three lenticular galaxies NGC 1167, NGC 3245 and NGC 4150 as well as to one Sab galaxy NGC 338. We found that for galaxies with a high inclination (i > 55 − 60 • ) it is difficult or rather impossible to extract the information about SVE while for galaxies at an intermediate inclination the procedure of extracting is successful. For NGC 1167 we managed to reconstruct SVE, provided that the value of σ z /σ R is piecewise constant. We found σ z /σ R = 0.7 for the inner parts of the disc and σ z /σ R = 0.3 for the outskirts. We also obtained a rigid constrain on the value of the radial velocity dispersion σ R for highly inclined galaxies and tested the result using the asymmetric drift equation, provided that the gas rotation curve is available.

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Model rotation curves of disk galaxies oriented at an arbitrary angle to the plane of the sky

Cited by 4 publications

References 3 publications

Galaxies with conspicuous optical warps

Galaxies with conspicuous optical warps

Reconstructing the velocity dispersion profiles from the line-of-sight kinematic data in disc galaxies

Reconstructing the velocity dispersion profiles from the line-of-sight kinematic data in disc galaxies

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