Large-scale nested stellar discs in NGC 7217

Olga K. SilChenko, Igor V. Chilingarian, Natalia Ya. Sotnikova, Victor L. Afanasiev

Research output: Contribution to journalArticleResearch

21 Citations (Scopus)

Abstract

NGC 7217 is an unbarred early-type spiral galaxy having a multisegment exponential light profile and a system of star-forming rings of the unknown origin; it also possesses a circumnuclear gaseous polar disc. We analysed new long-slit spectroscopic data for NGC 7217 and derived the radial distributions of its stellar population parameters, and stellar and gaseous kinematics up to the radius of r≈100 arcsec (˜8 kpc). We performed the dynamical analysis of the galaxy by recovering its velocity ellipsoid at different radii and estimated the scaleheights of its two exponential discs. The inner exponential stellar disc of NGC 7217 appears to be thin and harbours intermediate-age stars (t_SSP≈5 Gyr). The outer stellar disc seen between the radii of 4 and 7 kpc is very thick (z_0= 1, … , 3 kpc), metal-poor, [Fe/H] <-0.4 dex, and has predominantly young stars, t_SSP=2 Gyr. The remnants of minor mergers of gas-rich satellites with an early-type giant disc galaxy available in the GalMer data base well resemble differe
Original languageEnglish
Pages (from-to)3645-3655
JournalMonthly Notices of the Royal Astronomical Society
Volume414
Issue number4
DOIs
StatePublished - 2011

Keywords

  • galaxies: evolution
  • galaxies: individual: NGC 7217
  • galaxies: spiral
  • galaxies: structure

Cite this

SilChenko, Olga K. ; Chilingarian, Igor V. ; Sotnikova, Natalia Ya. ; Afanasiev, Victor L. / Large-scale nested stellar discs in NGC 7217. In: Monthly Notices of the Royal Astronomical Society. 2011 ; Vol. 414, No. 4. pp. 3645-3655.
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abstract = "NGC 7217 is an unbarred early-type spiral galaxy having a multisegment exponential light profile and a system of star-forming rings of the unknown origin; it also possesses a circumnuclear gaseous polar disc. We analysed new long-slit spectroscopic data for NGC 7217 and derived the radial distributions of its stellar population parameters, and stellar and gaseous kinematics up to the radius of r≈100 arcsec (˜8 kpc). We performed the dynamical analysis of the galaxy by recovering its velocity ellipsoid at different radii and estimated the scaleheights of its two exponential discs. The inner exponential stellar disc of NGC 7217 appears to be thin and harbours intermediate-age stars (t_SSP≈5 Gyr). The outer stellar disc seen between the radii of 4 and 7 kpc is very thick (z_0= 1, … , 3 kpc), metal-poor, [Fe/H] <-0.4 dex, and has predominantly young stars, t_SSP=2 Gyr. The remnants of minor mergers of gas-rich satellites with an early-type giant disc galaxy available in the GalMer data base well resemble differe",
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author = "SilChenko, {Olga K.} and Chilingarian, {Igor V.} and Sotnikova, {Natalia Ya.} and Afanasiev, {Victor L.}",
year = "2011",
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Large-scale nested stellar discs in NGC 7217. / SilChenko, Olga K.; Chilingarian, Igor V.; Sotnikova, Natalia Ya.; Afanasiev, Victor L.

In: Monthly Notices of the Royal Astronomical Society, Vol. 414, No. 4, 2011, p. 3645-3655.

Research output: Contribution to journalArticleResearch

TY - JOUR

T1 - Large-scale nested stellar discs in NGC 7217

AU - SilChenko, Olga K.

AU - Chilingarian, Igor V.

AU - Sotnikova, Natalia Ya.

AU - Afanasiev, Victor L.

PY - 2011

Y1 - 2011

N2 - NGC 7217 is an unbarred early-type spiral galaxy having a multisegment exponential light profile and a system of star-forming rings of the unknown origin; it also possesses a circumnuclear gaseous polar disc. We analysed new long-slit spectroscopic data for NGC 7217 and derived the radial distributions of its stellar population parameters, and stellar and gaseous kinematics up to the radius of r≈100 arcsec (˜8 kpc). We performed the dynamical analysis of the galaxy by recovering its velocity ellipsoid at different radii and estimated the scaleheights of its two exponential discs. The inner exponential stellar disc of NGC 7217 appears to be thin and harbours intermediate-age stars (t_SSP≈5 Gyr). The outer stellar disc seen between the radii of 4 and 7 kpc is very thick (z_0= 1, … , 3 kpc), metal-poor, [Fe/H] <-0.4 dex, and has predominantly young stars, t_SSP=2 Gyr. The remnants of minor mergers of gas-rich satellites with an early-type giant disc galaxy available in the GalMer data base well resemble differe

AB - NGC 7217 is an unbarred early-type spiral galaxy having a multisegment exponential light profile and a system of star-forming rings of the unknown origin; it also possesses a circumnuclear gaseous polar disc. We analysed new long-slit spectroscopic data for NGC 7217 and derived the radial distributions of its stellar population parameters, and stellar and gaseous kinematics up to the radius of r≈100 arcsec (˜8 kpc). We performed the dynamical analysis of the galaxy by recovering its velocity ellipsoid at different radii and estimated the scaleheights of its two exponential discs. The inner exponential stellar disc of NGC 7217 appears to be thin and harbours intermediate-age stars (t_SSP≈5 Gyr). The outer stellar disc seen between the radii of 4 and 7 kpc is very thick (z_0= 1, … , 3 kpc), metal-poor, [Fe/H] <-0.4 dex, and has predominantly young stars, t_SSP=2 Gyr. The remnants of minor mergers of gas-rich satellites with an early-type giant disc galaxy available in the GalMer data base well resemble differe

KW - galaxies: evolution

KW - galaxies: individual: NGC 7217

KW - galaxies: spiral

KW - galaxies: structure

U2 - 10.1111/j.1365-2966.2011.18665.x

DO - 10.1111/j.1365-2966.2011.18665.x

M3 - Article

VL - 414

SP - 3645

EP - 3655

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

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ER -