Large‐scale streaming of flat galaxies

Караченцев, И. Д.; Караченцева, В. Е.; Kudrya, Yu. N.; Parnovsky, S. L.

doi:10.1002/asna.2103160602

Cited by 31 publications

(47 citation statements)

References 22 publications

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“…Our results re-enforce the conclusions of Karachentsev and collaborators (Karachentsev et al 1993(Karachentsev et al , 1999) that simple disk galaxies are relatively common, especially among intermediate-mass starforming galaxies (Matthews & Gallagher 1997). Galaxy formation models must be able to produce such high angular momentum systems with reasonable frequencies.…”

Section: Conclusion and Summarysupporting

confidence: 88%

“…7: RFGC objects clearly exceed our chosen limits for simple disk galaxies in the case of both discriminators, the CI (upper inset) and the ε (bottom inset). That means that Karachentsev et al (1993) and Karachentsev et al (1999) did not only select simple disk systems, but also included some mixed-morphology galaxies, whose classification we can now correct thanks to the CCD data 3 .…”

Section: A Comparison Of the Revised Flat Galaxies Catalog With Our Cmentioning

confidence: 92%

“…For instance, uncertainties can be introduced by variations in galaxy properties which are a form of "cosmic noise". We required our visual subdivision to be consistent with the earlier studies (Karachentsev et al 1993(Karachentsev et al , 1999.…”

Section: The Intermediate Class Contains the Largest Fraction Of Galamentioning

confidence: 99%

“…He used photographic data in order to identify and catalog these systems. The resulting catalogs are the "Flat Galaxy Catalogue" (hereafter FGC) (Karachentsev et al 1993) and its extension, the "Revised Flat Galaxy Catalogue" (hereafter RFGC) by Karachentsev et al (1999). This RFGC is an all-sky survey and contains the largest published compilation of visually selected bulgeless edge-on galaxies: 4236 objects in total.…”

Section: Introductionmentioning

confidence: 99%

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A catalog of edge-on disk galaxies

Kautsch¹,

Grebel²,

Barazza

et al. 2005

A&A

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Spiral galaxies range from bulge-dominated early-type galaxies to late types with little or no bulge. Cosmological models do not predict the formation of disk-dominated, essentially bulgeless galaxies, yet these objects exist. A particularly striking and poorly understood example of bulgeless galaxies are flat or superthin galaxies with large axis ratios. We therefore embarked on a study aimed at a better understanding of these enigmatic objects, starting by compiling a statistically meaningful sample with well-defined properties. The disk axis ratios can be most easily measured when galaxies are seen edge-on. We used data from the Sloan Digital Sky Survey (SDSS) in order to identify edge-on galaxies with disks in a uniform, reproducible, automated fashion. In the five-color photometric database of the SDSS Data Release 1 (2099 deg 2 ) we identified 3169 edge-on disk galaxies, which we subdivided into disk galaxies with bulge, intermediate types, and simple disk galaxies without any obvious bulge component. We subdivided these types further into subclasses: Sa(f), Sb(f), Sc(f), Scd(f), Sd(f), Irr(f), where the (f) indicates that these galaxies are seen edge-on. Here we present our selection algorithm and the resulting catalogs of the 3169 edge-on disk galaxies including the photometric, morphological, and structural parameters of our targets. A number of incompleteness effects affect our catalog, but it contains almost a factor of four more bulgeless galaxies with prominent simple disks (flat galaxies) within the area covered here than previous optical catalogs, which were based on the visual selection from photographic plates (cf. Karachentsev et al. 1999, Bull. Special Astrophys. Obs., 47, 5). We find that approximately 15% of the edge-on disk galaxies in our catalog are flat galaxies, demonstrating that these galaxies are fairly common, especially among intermediate-mass star-forming galaxies. Bulgeless disks account for roughly one third of our galaxies when also puffy disks and edge-on irregulars are included. Our catalog provides a uniform database for a multitude of follow-up studies of bulgeless galaxies in order to constrain their intrinsic and environmental properties and their evolutionary status.

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Section: Conclusion and Summarysupporting

confidence: 88%

Section: A Comparison Of the Revised Flat Galaxies Catalog With Our Cmentioning

confidence: 92%

Section: The Intermediate Class Contains the Largest Fraction Of Galamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A catalog of edge-on disk galaxies

Kautsch¹,

Grebel²,

Barazza

et al. 2005

A&A

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“…Major Tully-Fisher distances catalogs are provided, including the Nearby Galaxies Catalog (NGC, Tully 1988, n=2371), the Mark III Catalog of Galaxy Peculiar Velocities (Mk III, Willick et al 1997, the Revised Flat Galaxies Catalog (RFGC, see Karachentsev et al 2000, n=1327, and Parnovsky & Parnowski (2010, n=1623), the Two-Micron All-Sky Survey (2MASS) Flat Galaxy Catalog (2MFGC, Karachentsev et al 2006Karachentsev et al , 2011, the Kinematics of the Local universe survey (KLUN, Theureau et al 2007, n=4149), and the Spiral Field I-band Plus survey (SFI++, Springob et al 2009, and references therein, n=4857). Additional Tully-Fisher distances among the many thousands in the EDD mentioned earlier but not published in other references are also included (EDD, Tully et al 2009Tully et al , 2013.…”

Section: How Ned-d Is Compiledmentioning

confidence: 99%

Redshift-Independent Distances in the Nasa/Ipac Extragalactic Database: Methodology, Content, and Use of Ned-D

Steer¹,

Madore

Mazzarella

et al. 2016

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Estimates of galaxy distances based on indicators that are independent of cosmological redshift are fundamental to astrophysics. Researchers use them to establish the extragalactic distance scale, to underpin estimates of the Hubble constant, and to study peculiar velocities induced by gravitational attractions that perturb the motions of galaxies with respect to the "Hubble flow" of universal expansion. In 2006 the NASA/IPAC Extragalactic Database (NED) began making available a comprehensive compilation of redshift-independent extragalactic distance estimates. A decade later, this compendium of distances (NED-D) now contains more than 100,000 individual estimates based on primary and secondary indicators, available for more than 28,000 galaxies, and compiled from over 2000 references in the refereed astronomical literature. This paper describes the methodology, content, and use of NED-D, and addresses challenges to be overcome in compiling such distances. Currently, 75 different distance indicators are in use. We include a figure that facilitates comparison of the indicators with significant numbers of estimates in terms of the minimum, 25th percentile, median, 75th percentile, and maximum distances spanned. Brief descriptions of the indicators, including examples of their use in the database, are given in an appendix.

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Influence of measurement errors and deviations from Tully‐Fisher relationship on multipole structure of bulk galaxy motion

Parnovsky

Parnowski

2008

Astron Nachr

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The velocity field of large-scale non-Hubble galaxy motion recovered from peculiar velocities of spiral galaxies is distorted due to measurement errors and deviations from Tully-Fisher relationship. To figure out how this affects the multipole structure we use the Monte-Carlo approach and simulate errors and deviations. We use the galaxies from the Revised Flat Galaxy Catalogue subsample and the generalized Tully-Fisher relationship in the 'H I line width-angular diameter' version. The analysis of the multipole structure has shown that the dipole velocity component (bulk motion) is underestimated, and the characteristic values of the quadrupole component are overestimated. The directions of the quadrupole component's eigenvectors can be determined precisely enough. Typical deviation angles of bulk motion apices lie between 17 and 40• . The main input is caused by errors in the measurement of the angular diameter. The probability of the quadrupole component being incidental can be estimated at the 4 per cent level. For the octopole component, it can be estimated at the 7-10 per cent level. This is essentially higher than the estimations less than 1 per cent due to the Fisher test.

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Large‐scale streaming of flat galaxies

Cited by 31 publications

References 22 publications

A catalog of edge-on disk galaxies

A catalog of edge-on disk galaxies

Redshift-Independent Distances in the Nasa/Ipac Extragalactic Database: Methodology, Content, and Use of Ned-D

Influence of measurement errors and deviations from Tully‐Fisher relationship on multipole structure of bulk galaxy motion

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