H I observations of flat galaxies

Митронова, С. Н.; Huchtmeier, W. K.; Караченцев, И. Д.; Караченцева, В. Е.; Kudrya, Yu. N.

doi:10.1134/1.2007027

Cited by 17 publications

(18 citation statements)

References 15 publications

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“…NGC 6010. This is another small-bulge, edge-on S0 galaxy included in the catalog of "flat galaxies" by Mitronova et al (2004). Also, we must note that in our present sample it is the only S0 galaxy without strong emission lines in the spectra.…”

Section: Resultsmentioning

confidence: 99%

“…This very luminous S0 + galaxy is strongly inclined to the line of sight, but it is not exactly edge-on, so we can distinguish a dust ring and no signs of a bar in the galaxy. The bulge is so small that the galaxy has been included in the list of "flat" late-type galaxies by Mitronova et al (2004). The systemic velocity of NGC 2917 given in the NED, 3675 km s −1 , is erroneous coming from a very weak spurious 21 cm signal detected by Richter & Huchtmeier (1987).…”

Section: Resultsmentioning

confidence: 99%

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Kinematics and Stellar Populations in Isolated Lenticular Galaxies

Katkov

Kniazev

Сильченко

2015

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By combining new long-slit spectral data obtained with the Southern African Large Telescope for nine galaxies with our previously published observations for 12 additional galaxies, we study the stellar and gaseous kinematics as well as radially resolved stellar population properties and ionized-gas metallicity and excitation for a sample of isolated lenticular galaxies. We have found that there is no particular time frame of formation for the isolated lenticular galaxies: the mean stellar ages of the bulges and disks are distributed between 1 and 13 > Gyr, and the bulge and the disk in every galaxy formed synchronously demonstrate similar stellar ages and magnesium-to-iron ratios. Extended ionized-gas disks are found in the majority of the isolated lenticular galaxies, in 72% ±11%. Half of all extended gaseous disks demonstrate a visible counterrotation with respect to their stellar counterparts. We argue that just such a fraction of projected counterrotation is expected if all of the gas in isolated lenticular galaxies is accreted from outside, under the assumption of isotropically distributed external sources. The very narrow range of the gas oxygen abundances we found for the outer ionized-gas disks excited by young stars, [O/H] from 0.0 to +0.2 dex, gives evidence for satellite merging as the most probable source of this accretion. Last, we formulate a hypothesis that the morphological type of a field disk galaxy is completely determined by the outer cold-gas accretion regime.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Kinematics and Stellar Populations in Isolated Lenticular Galaxies

Katkov

Kniazev

Сильченко

2015

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“…An excess of UFGs in the region of the Local Supercluster center (RA = 12. h 5, Dec = +12 • ) as compared to the homogeneous distribution is only ∆N ∼ 5 of galaxies. The section of 3000-10 000 km s −1 (the second panel from the top) is filled the most complete mainly due to the observations with the 300-m Arecibo Observatory radio telescope [22], the 6-m BTA telescope [23] and the 100-m Radio Telescope Effelsberg [24,25]. The galaxies in this radial velocity interval also show a barely discernible concentration in the regions of the well-known Coma and Pisces-Perseus clusters.…”

Section: A Sample Of Super-thin Edge-on Spiral Galaxiesmentioning

confidence: 98%

Ultra-flat galaxies selected from RFGC catalog. I. The sample properties

et al. 2016

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We used the Revised Flat Galaxy Catalog (RFGC) to create a sample of ultra-flat galaxies (UFG) covering the whole northern and southern sky apart from the Milky Way zone. It contains 817 spiral galaxies seen edge-on, selected into the UFG sample according to their apparent axial ratios (a/b) B ≥ 10.0 and (a/b) R ≥ 8.53 in the blue and red bands, respectively. Within this basic sample we fixed an exemplary sample of 441 UFG galaxies having the radial velocities of V LG < 10000 km s −1 , Galactic latitude of | b |> 10 • and the blue angular diameter of a B > 1. ′ 0. According to the Schmidt test the exemplary sample of 441 galaxies is characterized by about (80-90)% completeness, what is quite enough to study different properties of the ultra-flat galaxies. We found that more than 3/4 of UFGs have the morphological types within the narrow range of T = 7 ± 1, i.e. the thinnest stellar disks occur among the Scd, Sd, and Sdm types. The average surface brightness of UFG galaxies tends to diminish towards the flattest bulge-less galaxies. Regularly shaped disks without signs of asymmetry make up about 2/3 both among all the RFGC galaxies, and the UFG sample objects. About 60% of ultra-flat galaxies can be referred to dynamically isolated objects, while 30% of them probably belong to the scattered associations (filaments, walls), and only about 10% of them are dynamically dominating galaxies with respect to their neighbours.

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“…(3)A list of southern RFGC galaxies identified in the HIPASS survey [20] and in the catalog of Kilborn et al [21]. (4) Data from our observations on the 100-m Effelsberg telescope [22,23]. (5) A summary catalog of the profiles of the hydrogen 21 cm line in optically selected galaxies [24].…”

Section: A New Sample and Tully-fisher Relationmentioning

confidence: 99%

Peculiar velocities of 3000 spiral galaxies from the 2MFGC catalog

et al. 2006

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The 2MFGC catalog we have used contains 18020 galaxies selected from the extended objects in the 2MASS infrared sky survey as having apparent ratios of the axes b/a < 0.3. Most of them are spiral galaxies of late morphological types whose discs are seen almost edge-on. The individual distances to the 2724 2MFGC galaxies with known rotation velocities and radial velocities are determined using a multi-parametric infrared Tully-Fisher relation. A list of the distances and peculiar velocities of these galaxies is presented. The bulk motion of the 2MFGC galaxies relative to the cosmic microwave background is characterized with the velocity V = 199±37 km/s in the direction l = 304°±11°, b = -8°±8°. Our list is currently the most representative and uniform sample for analyzing non-Hubble motion of galaxies on a scale of ~100 Mpc.

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H I observations of flat galaxies

Cited by 17 publications

References 15 publications

Kinematics and Stellar Populations in Isolated Lenticular Galaxies

Kinematics and Stellar Populations in Isolated Lenticular Galaxies

Ultra-flat galaxies selected from RFGC catalog. I. The sample properties

Peculiar velocities of 3000 spiral galaxies from the 2MFGC catalog

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