Access to Astronomical Catalogues

← Click to display the menu
J/A+A/428/877   4 nearby galaxies velocities & line-strengths (Krajnovic+, 2004)

HST observations of nuclear stellar disks. Krajnovic D., Jaffe W. <Astron. Astrophys. 428, 877 (2004)> =2004A&A...428..877K
ADC_Keywords: Galaxies, nearby ; Velocity dispersion ; Spectroscopy Keywords: galaxies: elliptical and lenticular, cD - galaxies: nuclei - galaxies: kinematics and dynamics - galaxies: galaxies: photometry - galaxies: stellar content - galaxies: evolution Abstract: We present observations of four nearby early-type galaxies previously known (Rest et al., 2001AJ....121.2431R) to have nuclear stellar disks using two instruments on-board the Hubble Space Telescope. We observed NGC 4128, NGC 4612, and NGC 5308 with the Wide Field Planetary Camera 2, and the same three galaxies, plus NGC 4570, with the Space Telescope Imaging Spectrograph. We have detected a red nucleus in NGC 4128, a blue nucleus in NGC 4621, and a blue disk in NGC 5308. Additionally, we have discovered a blue disk-like feature with position angle ∼15° from the major axis in NGC 4621. In NGC 5308 there is evidence for a blue region along the minor axis. We discovered a blue transient on the images of NGC 4128 at position 0.14" west and 0.32" north from the nucleus. The extracted kinematic profiles belong to two groups: fast (NGC 4570 and NGC 5308) and kinematically disturbed rotators (NGC 4128 and NGC 4621). We report the discovery of a kinematically decoupled core in NGC 4128. Galaxies have mostly old (10-14Gyr) stellar populations with large spread in metallicities (sub- to super-solar). We discuss the possible formation scenarios, including bar-driven secular evolution and the influence of mergers, which can explain the observed color and kinematic features. Description: Measured kinematics and line-strengths for observed galaxies using full spectral region in the fit and excluding Mgb region from the fit. Objects: ---------------------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------------------- 12 08 32.2 +68 46 05 NGC 4128 = UGC 7120 12 36 53.6 +07 14 46 NGC 4570 = UGC 7785 12 42 02.4 +11 38 45 NGC 4621 = M 59 = UGC 7858 13 47 00.4 +60 58 23 NGC 5308 = UGC 8722 ---------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file tablea1.dat 57 48 Measured kinematics and line-strengths for observed galaxies using full spectral region in the fit tablea2.dat 57 48 Measured kinematics and line-strengths for observed galaxies excluding Mgb region from the fit
Byte-by-byte Description of file: tablea1.dat tablea2.dat
Bytes Format Units Label Explanations
1- 3 A3 --- --- [NGC] 5- 8 I4 --- NGC NGC number of the object 10- 14 F5.2 arcsec Radius Radius of measurement 17- 20 I4 km/s Vel Mean velocity 24- 25 I2 km/s e_Vel Mean velocity error 29- 31 I3 km/s sigma Velocity dispersion 35- 36 I2 km/s e_sigma Velocity dispersion error 40- 42 F3.1 0.1nm Mgb Mgb line-strength 45- 47 F3.1 0.1nm e_Mgb Mgb line-strength error 50- 52 F3.1 0.1nm Fe5270 Fe5270 line-strength 55- 57 F3.1 0.1nm e_Fe5270 Fe5270 line-strength error
Acknowledgements: Davor Krajnovic, davor(at)strw.leidenuniv.nl
(End) Patricia Vannier [CDS] 16-Sep-2004
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

catalogue service

© UDS/CNRS

Contact