Does the stellar disc flattening depend on the galaxy type?

Based on SDSS data, we have selected a sample of nine edge-on spiral galaxies with bulges whose major axes show a high inclination to the disk plane. Such objects are called polar-bulge galaxies. They are similar in their morphology to polar-ring galaxies, but the central objects in them have small size and low luminosity. We have performed a photometric analysis of the galaxies in the g and r bands and determined the main characteristics of their bulges and disks. We show that the disks of such galaxies are typical for the disks of spiral galaxies of late morphological types. The integrated characteristics of their bulges are similar to the parameters of normal bulges. The stellar disks of polar-bulge galaxies often show large-scale warps, which can be explained by their interaction with neighboring galaxies or external accretion from outside.

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“…These values are close to the galactic disk thickness in welldefined samples of edge-on spiral galaxies (Mosenkov et al 2015).…”

Section: General Characteristics Of the Galaxiessupporting

confidence: 77%

Polar-bulge galaxies

et al. 2015

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“…As demonstrated by Mosenkov et al (2015), this can seriously affect the resulting galaxy parameters. Particularly striking is the huge discrepancy (more than a factor of two) between the I-band radial scale length obtained by Kregel et al (2002) compared to the one obtained by Xilouris et al (1999).…”

Section: The Targetmentioning

confidence: 99%

HERschelObservations of Edge-on Spirals (HEROES)

Mosenkov

Allaert

Baes

et al. 2016

A&A

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We investigate the dust energy balance for the edge-on galaxy IC 2531, one of the seven galaxies in the HEROES sample. We perform a state-of-the-art radiative transfer modelling based, for the first time, on a set of optical and near-infrared galaxy images. We show that by taking into account near-infrared imaging in the modelling significantly improves the constraints on the retrieved parameters of the dust content. We confirm the result from previous studies that including a young stellar population in the modelling is important to explain the observed stellar energy distribution. However, the discrepancy between the observed and modelled thermal emission at far-infrared wavelengths, the so-called dust energy balance problem, is still present: the model underestimates the observed fluxes by a factor of about two. We compare two different dust models, and find that dust parameters, and thus the spectral energy distribution in the infrared domain, are sensitive to the adopted dust model. In general, the THEMIS model reproduces the observed emission in the infrared wavelength domain better than the popular BARE-GR-S model. Our study of IC 2531 is a pilot case for detailed and uniform radiative transfer modelling of the entire HEROES sample, which will shed more light on the strength and origins of the dust energy balance problem.

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“…deGrijs et al (1997) showed that the photometric vertical scale height increases by 20% if the inclination i deviates from the 90 o by 5 o . We use the visibility of the dust lane in SDSS images of all selected galaxies with lags and simple technique described in Bizyaev & Kajsin (2004); Mosenkov et al (2015) to estimate the inclination. We do not see any dependence between the lag and the inclination.…”

Section: Inclination Effectsmentioning

confidence: 99%

SDSS IV MaNGA—Rotation Velocity Lags in the Extraplanar Ionized Gas from MaNGA Observations of Edge-on Galaxies

Bizyaev

Walterbos

Yoachim

et al. 2017

ApJ

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We present a study of the kinematics of the extraplanar ionized gas around several dozen galaxies observed by the Mapping of Nearby Galaxies at the Apache Point Observatory (MaNGA) survey. We considered a sample of 67 edge-on galaxies out of more than 1400 extragalactic targets observed by MaNGA, in which we found 25 galaxies (or 37%) with regular lagging of the rotation curve at large distances from the galactic midplane. We model the observed Hα emission velocity fields in the galaxies, taking projection effects and a simple model for the dust extinction into the account. We show that the vertical lag of the rotation curve is necessary in the modeling, and estimate the lag amplitude in the galaxies. We find no correlation between the lag and the star formation rate in the galaxies. At the same time, we report a correlation between the lag and the galactic stellar mass, central stellar velocity dispersion, and axial ratio of the light distribution. These correlations suggest a possible higher ratio of infalling-to-local gas in early-type disk galaxies or a connection between lags and the possible presence of hot gaseous halos, which may be more prevalent in more massive galaxies. These results again demonstrate that observations of extraplanar gas can serve as a potential probe for accretion of gas.

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Does the stellar disc flattening depend on the galaxy type?

Cited by 44 publications

References 58 publications

Polar-bulge galaxies

Polar-bulge galaxies

HERschelObservations of Edge-on Spirals (HEROES)

SDSS IV MaNGA—Rotation Velocity Lags in the Extraplanar Ionized Gas from MaNGA Observations of Edge-on Galaxies

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