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HD 168424


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Model-independent measurements of bar pattern speeds
The pattern speed is one of the fundamental parameters that determinesthe structure of barred galaxies. This quantity is usually derived fromindirect methods or by employing model assumptions. The number of barpattern speeds derived using the model-independent Tremaine &Weinberg technique is still very limited. We present the results ofmodel-independent measurements of the bar pattern speed in four galaxiesranging in Hubble type from SB0 to SBbc. Three of the four galaxies inour sample are consistent with bars being fast rotators. The lack ofslow bars is consistent with previous observations and suggests thatbarred galaxies do not have centrally concentrated dark matter haloes.This contradicts simulations of cosmological structure formation andobservations of the central mass concentration in nonbarred galaxies.

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Observation and Astrometry data

Constellation:ぼうえんきょう座
Right ascension:18h21m55.73s
Declination:-47°43'25.6"
Apparent magnitude:8.372
Distance:709.22 parsecs
Proper motion RA:4.7
Proper motion Dec:0.6
B-T magnitude:9.652
V-T magnitude:8.478

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 168424
TYCHO-2 2000TYC 8362-1625-1
USNO-A2.0USNO-A2 0375-35158240
HIPHIP 90008

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