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

Результат исследований: Научные публикации в периодических изданияхстатья

5 Цитирования (Scopus)

Выдержка

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 σz/σR 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 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 σz/σR is piecewise constant. We found σz/σR = 0.7 for the inner parts of the disc and σz/σR = 0.3 for the outskirts. We also obtained a rigid constraint on the value of the radial velocity dispersion σR for highly inclined galaxies, and tested the result using the asymmetric-drift equation, provided that the gas rotation curve is available.
Язык оригиналаанглийский
Страницы (с-по)4956-4967
Число страниц12
ЖурналMonthly Notices of the Royal Astronomical Society
Том465
Номер выпуска4
DOI
СостояниеОпубликовано - 2017

Отпечаток

disk galaxies
line of sight
kinematics
galaxies
profiles
ellipsoids
inclination
radial velocity
gas
curves
gases
method

Ключевые слова

  • galaxies: fundamental parameters, galaxies: kinematics and dynamics

Цитировать

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title = "Reconstructing the velocity dispersion profiles from the line-of-sight kinematic data in disc galaxies",
abstract = "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 σz/σR 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 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 σz/σR is piecewise constant. We found σz/σR = 0.7 for the inner parts of the disc and σz/σR = 0.3 for the outskirts. We also obtained a rigid constraint on the value of the radial velocity dispersion σR for highly inclined galaxies, and tested the result using the asymmetric-drift equation, provided that the gas rotation curve is available.",
keywords = "galaxies: fundamental parameters, galaxies: kinematics and dynamics",
author = "Сотникова, {наталья Яковлевна} and Марчук, {Александр Александрович}",
year = "2017",
doi = "10.1093/mnras/stw3092",
language = "English",
volume = "465",
pages = "4956--4967",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
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}

Reconstructing the velocity dispersion profiles from the line-of-sight kinematic data in disc galaxies. / Сотникова, наталья Яковлевна; Марчук, Александр Александрович.

В: Monthly Notices of the Royal Astronomical Society, Том 465, № 4, 2017, стр. 4956-4967.

Результат исследований: Научные публикации в периодических изданияхстатья

TY - JOUR

T1 - Reconstructing the velocity dispersion profiles from the line-of-sight kinematic data in disc galaxies

AU - Сотникова, наталья Яковлевна

AU - Марчук, Александр Александрович

PY - 2017

Y1 - 2017

N2 - 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 σz/σR 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 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 σz/σR is piecewise constant. We found σz/σR = 0.7 for the inner parts of the disc and σz/σR = 0.3 for the outskirts. We also obtained a rigid constraint on the value of the radial velocity dispersion σR for highly inclined galaxies, and tested the result using the asymmetric-drift equation, provided that the gas rotation curve is available.

AB - 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 σz/σR 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 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 σz/σR is piecewise constant. We found σz/σR = 0.7 for the inner parts of the disc and σz/σR = 0.3 for the outskirts. We also obtained a rigid constraint on the value of the radial velocity dispersion σR for highly inclined galaxies, and tested the result using the asymmetric-drift equation, provided that the gas rotation curve is available.

KW - galaxies: fundamental parameters, galaxies: kinematics and dynamics

U2 - 10.1093/mnras/stw3092

DO - 10.1093/mnras/stw3092

M3 - Article

VL - 465

SP - 4956

EP - 4967

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 4

ER -