Peculiar galaxies UGC 5119 and NGC 2748 galaxies with stellar polar rings O' Merkulova, L' Shalyapin

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Peculiar galaxies UGC 5119 and NGC 2748
galaxies with stellar polar rings?O. Merkulova,
L. Shalyapina, V. Yakovleva(Saint-Petersburg
State University)?
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Polar-ring galaxies
NGC 4650A
NGC 2685
NGC 660
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Polar-ring galaxies
NGC 4650A

• the rare class of dynamically
• peculiar systems where the rings of
• gas, dust and stars aligned roughly
• perpendicular to the major axis
• of the main galaxy
• Whitmore et al. (1990) Catalog
• of polar-ring galaxies, candidates
• and related objects (PRC)

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Polar-ring galaxies

• the rare class of dynamically peculiar systems
  where the rings of gas, dust and stars aligned
  roughly perpendicular to the major axis of the
  main galaxy

• Whitmore et al. (1990) Catalog of polar-ring
  galaxies, candidates and related objects (PRC)?

• UGC 5119 PRC B-19
• NGC 2748 PRC C-28

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Observations(6-m telescope of SAO RAS)
UGC 5119
NGC 2748
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UGC 5119 (PRC B-19)?
Basic parameters

• Distance (H0 65 km/s/Mpc) 91.8 Mpc
• Scale 1? 0.45 kpc
• Morph. type E2
• Vhel 5986 km/s
• MB,0 -20m.3
• PA of major axis 12
• Bulge parameters µeR 18.5
  mag/??, reR 3?.4 (1.5 kpc)
• PA of major axis of ring 78

Image in the V band
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MPFS results
Model Rotation Curve
Stellar velocity field
Model of Observed Stellar Rotation Curve by
Freeman Disk Vsys 5986 km/s i 45 h 3?.
(1.4 kpc).
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MPFS results
Stellar velocity field
Continuum map
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Long-slit results

• Main features
• Radial velocity curve along galaxy major axis
  rotation around minor axis
• Radial velocity curve along ring major axis
• a) central region (R 10?)
• zero-velocities
• b) outer regions (R 10?)
• the presence of velocity gradient

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Long-slit results

• Main features
• Radial velocity curve along galaxy major axis
  rotation around minor axis
• Radial velocity curve along ring major axis
• a) central region (R 10?)
• zero-velocities
• b) outer regions (R 10?)
• the presence of velocity gradient

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Along Galaxy Major Axis
Along Ring Major Axis
Nucleus T1x109 yr, Fe/H0.0-0.25, a/Fe0.0
R 4? T2x109 yr, Fe/H0.0-0.25,
a/Fe0.0 R6? T3x109 yr, Fe/H0.0,
a/Felt0.0
R 5? T6x109 yr, Fe/H-0.33,
a/Fe0.0 R9? T17x109 yr, Fe/H-1.5,
a/Fe0.3
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NGC 2748 (PRC C-28)

• Basic parameters
• Distance (H0 65 km/s/Mpc) 25.5 Mpc
• Scale 1? 0.12 kpc
• Morph. type (RC3) Sbc (T4)
• Vhel 1490 km/s
• MB0 -18m.95
• Inclination i 67
• P.A. of major axis 42
• MHI 2.14 ? 109 ?Sun
• MHI/LB 0.47 ?Sun/LSun,B
• The group member of 11 galaxies

Image in the B-band with different brightness
thresholds
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Fabry-Perot Interferometer results
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• Fitting results
• inner thin disk h0 4? 0.5 kpc, q 0.1
• outer thick disk h 25? 3.1 kpc
• halo ?0 0.001 MSun/pc3,
• Rc 53? 6.6 kpc

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Stellar radial velocity curves
Main features Rotation Curve along galaxy major
axis disk-like rotation Rotation Curve along
ring major axis a) central region (R
20?) zero-velocities b) outer regions (R
20?) the presence of velocity gradient
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Two kinematically distinct subsystems 1) The
main galaxy disk PA1 42, i1 67 2) The
stellar ring PA2 132, i2 55
The angle between the galactic disk and the ring
is equal to 77 10, so the stellar ring is
polar
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Conclusions

• Peculiar galaxies UGC 5119 and NGC 2748,
  probably, have stellar polar rings, which were
  formed, perhaps, as the result of dwarf
  elliptical galaxy capture and desruption.

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Conclusions

• Peculiar galaxies UGC 5119 and
• NGC 2748, probably, have stellar polar rings,
  which were formed, perhaps, as the result of
  dwarf elliptical galaxy capture and desruption.