The Catalog of Edge-on Disk Galaxies From Sdss. I. The Catalog and the Structural Parameters of Stellar Disks

We present a detailed photometric study of a sample of 22 edge-on galaxies with clearly visible X-shaped structures. We propose a novel method to derive geometrical parameters of these features, along with the parameters of their host galaxies based on the multi-component photometric decomposition of galactic images. To include the X-shaped structure into our photometric model, we use the IMFIT package, in which we implement a new component describing the X-shaped structure. This method is applied for a sample of galaxies with available SDSS and Spitzer IRAC 3.6 µm observations. In order to explain our results, we perform realistic N -body simulations of a Milky Way-type galaxy and compare the observed and the model X-shaped structures. Our main conclusions are as follows: (1) galaxies with strong Xshaped structures reside in approximately the same local environments as field galaxies; (2) the characteristic size of the X-shaped structures is about 2/3 of the bar size; (3) there is a correlation between the X-shaped structure size and its observed flatness: the larger structures are more flattened; (4) our N -body simulations qualitatively confirm the observational results and support the bar-driven scenario for the X-shaped structure formation.

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“…The average observed colour of the galaxies ( g − r = +0.86 ± 0.07) is also consistent with edge-on early-type spirals (e.g., Bizyaev et al 2014 …”

Section: The Samplesupporting

confidence: 76%

“…Our sample of galaxies with the X-shaped structures is drawn from the EGIS catalogue (Bizyaev et al 2014), which contains 5747 edge-on galaxies. To form the sample of galaxies with prominent X-structures, we visually inspected SDSS 1 images of the EGIS galaxies.…”

Section: The Samplementioning

confidence: 99%

Measuring the X-shaped structures in edge-on galaxies

Савченко

Sotnikova

Mosenkov

et al. 2017

Monthly Notices of the Royal Astronomical Society

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“…We identified edge-on galaxies from visual inspection similar to how it was done in Bizyaev et al (2014): objects were classified as edge-on systems if they had no traces of spiral arms that could be seen, and also if the dust lane (if present) was projected on or very close to the galaxy's disk midplane. We also restricted our search to objects not showing obvious signs of interaction.…”

Section: The Sample Of Edge-on Galaxies In Mangamentioning

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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“…A catalog of edge-on disk galaxies in SDSS DR7 (EGIS; Bizyaev et al 2014) consists of 5747 genuine edge-on galaxies in the Sloan Digital Sky Survey (SDSS; Abazajian et al 2009). By analyzing photometric profiles in each of the g-, r-, and i-band images, the EGIS catalog provides estimates for structural parameters of the stellar disks of the galaxies, such as the disk scale height (h), radial scale length (z 0 ), and central surface brightness (µ 0 ).…”

Section: The Samplementioning

confidence: 99%

Long-slit Spectroscopy of Edge-on Low Surface Brightness Galaxies

Zhu

Zheng

et al. 2017

ApJ

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We present long-slit optical spectra of 12 edge-on low surface brightness galaxies (LSBGs) positioned along their major axes. After performing reddening corrections for the emission-line fluxes measured from the extracted integrated spectra, we measured the gas-phase metallicities of our LSBG sample using both the In the luminosity-metallicity plot, our LSBG sample is consistent with the behavior of normal galaxies. In the mass-metallicity diagram, our LSBG sample has lower metallicities for lower stellar mass, similar to normal galaxies. The stellar masses estimated from z-band luminosities are comparable to those of prominent spirals. In a plot of the gas mass fraction versus metallicity, our LSBG sample generally agrees with other samples in the high gas mass fraction space. Additionally, we have studied stellar populations of 3 LSBGs which have relatively reliable spectral continua and high signal-to-noise ratios, and qualitatively conclude that they have a potential dearth of stars with ages < 1 Gyr instead of being dominated by stellar populations with ages > 1 Gyr. Regarding the chemical evolution of our sample, the LSBG data appear to allow for up to 30% metal loss, but we cannot completely rule out the closed-box model. Additionally, we find evidence that our galaxies retain up to about 3 times as much of their metals compared with dwarfs, consistent with metal retention being related to galaxy mass. In conclusion, our data support the view that LSBGs are probably just normal disk galaxies continuously extending to the low end of surface brightness.

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The Catalog of Edge-on Disk Galaxies From Sdss. I. The Catalog and the Structural Parameters of Stellar Disks

Cited by 80 publications

References 49 publications

Measuring the X-shaped structures in edge-on galaxies

Measuring the X-shaped structures in edge-on galaxies

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

Long-slit Spectroscopy of Edge-on Low Surface Brightness Galaxies

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