Velocity fields in late-type galaxies from H-alpha Fabry-Perot interferometry. II - Kinematics and dynamics of the SD spiral NGC 7793

1980 ◽  
Vol 242 ◽  
pp. 30 ◽  
Author(s):  
E. Davoust ◽  
G. de Vaucouleurs
Keyword(s):  
Velocity Fields ◽  
Kinematics And Dynamics ◽  
Late Type ◽  
Fabry Perot

Ca II Emission from Late-type Stars

1983 ◽  
Vol 5 (2) ◽  
pp. 152-157 ◽  
Author(s):  
L. E. Cram
Keyword(s):  
Line Profile ◽  
Strong Correlation ◽  
Velocity Fields ◽  
Line Profiles ◽  
Late Type ◽  
Wide Range ◽  
Cool Stars ◽  
Visual Magnitude ◽  
The Absolute ◽  
Emission Core

Two recent observational surveys of the Ca II resonance lines (Zarro and Rodgers 1983; Linsky et al. 1979) illustrate the great diversity of line profile shapes found in the spectra of cool stars. This diversity reflects a corresponding wide range in the underlying chromospheric properties of the stars. There are, however, three well-marked systematic trends in the shapes of Ca II line profiles which presumably reflect systematic trends in chromospheric properties. One of these, the Wilson-Bappu effect (Wilson and Bappu 1957), describes the strong correlation betweeen the width of the emission core (see Figure 1) and the absolute visual magnitude of the star. Despite much work, it is still not clear whether this is due primarily to systematic changes of velocity fields (e.g. Hoyle and Wilson 1958) or optical depths (e.g. Jefferies and Thomas 1959) in stellar chromospheres.

scholarly journals Mass Determination in the Late-Type Spiral NGC 5457

2004 ◽  
Vol 220 ◽  
pp. 321-322
Author(s):  
Ivânio Puerari ◽  
Margarita Valdez-Gutiérrez ◽  
Margarita Rosado
Keyword(s):  
Dark Matter ◽  
Hii Regions ◽  
Matter Content ◽  
Gas Content ◽  
Dynamical Analysis ◽  
Mass Determination ◽  
Late Type ◽  
Ionized Gas ◽  
Fabry Perot ◽  
Insight Into

We have performed a kinematical and dynamical analysis of the ionized gas content of the late–type spiral NGC 5457 (M101) by means of scanning Fabry–Perot interferometry. the purpose of this study is to gain insight into the dark matter content in this galaxy. A sample of 263 HII regions were catalogued. We calculated radial velocity and velocity dispersions. From the dynamics of the ionized gas we were able to infer a mass of 9.8 × 1010 M⊙ inside a radius of 4'8 (or 10 kpc).

scholarly journals Star-forming regions in the intragroup medium of compact groups of galaxies

2009 ◽  
Vol 5 (S262) ◽  
pp. 440-441
Author(s):  
S. Torres-Flores ◽  
C. Mendes de Oliveira ◽  
D. F. de Mello ◽  
P. Amram ◽  
H. Plana ◽  
...  
Keyword(s):  
Star Formation ◽  
Dwarf Galaxy ◽  
Early Stage ◽  
Velocity Fields ◽  
Compact Groups ◽  
Advanced Stage ◽  
Groups Of Galaxies ◽  
Star Forming ◽  
Star Forming Regions ◽  
Fabry Perot

AbstractWe present the results of a multiwavelength campaign searching for young objects in the intragroup medium of seven compact groups of galaxies: HCG 2, 7, 22, 23, 92, 100 and NGC 92. We used Fabry-Perot velocity fields and rotation curves together with GALEX NUV and FUV images, optical R-band and HI maps to evaluate the stage of interaction of each group. We conclude that groups (i) HCG 7 and HCG 23 are in an early stage of interaction, (ii) HCG 2 and HCG 22 are mildly interacting, and (iii) HCG 92, HCG 100 and NGC 92 are in a late stage of evolution. Evolved groups have a population of young objects in their intragroup medium while no such population is found within the less evolved groups. We also report the discovery of a tidal dwarf galaxy candidate in the tail of NGC 92. These three groups, besides containing galaxies which have peculiar velocity fields, also show extended HI tails. Our results indicate that the advanced stage of evolution of a group together with the presence of intragroup HI clouds may lead to star formation in the intragroup medium.

scholarly journals Spectroscopic Variability in Late-Type Dwarfs Using High S:N Spectra

1988 ◽  
Vol 132 ◽  
pp. 287-289
Author(s):  
B. H. Foing ◽  
J. E. Beckman ◽  
G. Vladilo
Keyword(s):  
High Resolution ◽  
Surface Activity ◽  
Resonance Line ◽  
Velocity Fields ◽  
Doppler Imaging ◽  
Late Type ◽  
3 Dimensional ◽  
Spectral Signatures ◽  
Activity Cycles

Monitoring of active late-type dwarfs, spectroscopically with high resolution (λ/Δλ ∼ 105) and high S:N (>300) round their activity cycles, principally in the Call H resonance line, offers techniques to explore (a) plage filling factors (b) 3-dimensional chromospheric velocity fields (c) maps of surface activity via “Doppler Imaging”. In this paper we deal with the use of spectral signatures to derive plage cover.

scholarly journals Panoramic Spectroscopy of Sy Galaxies with elongated radio structures

2006 ◽  
Vol 2 (S235) ◽  
pp. 136-136
Author(s):  
A. A. Smirnova ◽  
A. V. Moiseev
Keyword(s):  
Velocity Fields ◽  
Emission Lines ◽  
Stellar Kinematics ◽  
Active Nucleus ◽  
Ionized Gas ◽  
Fabry Perot ◽  
Gas Ionization ◽  
Integral Field Spectrograph ◽  
Ionizing Gas ◽  
Integral Field

AbstractWe have studied the ionized gas and stellar kinematics in several galaxies with active nuclei and elongated radio structures using 3D spectroscopy. The observations were performed at the SAO RAS 6-m telescope with the integral-field spectrograph MPFS (Afanasiev et al. 2001) and with a scanning Fabry-Perot interferometer (FPI) in the multimode device SCORPIO (Afanasiev & Moiseev 2005). Based on these data the intensity maps and velocity fields in the different emission lines of the ionizing gas were constructed. Using the lines-ratio diagrams we tried to search a source of the gas ionization: an active nucleus, hot young stars or shock waves.

scholarly journals Dark Matter Distribution in Nearby Galaxies

2004 ◽  
Vol 220 ◽  
pp. 327-328
Author(s):  
Olivia Garrido ◽  
Philippe Amram ◽  
Claude Carignan ◽  
Sébastien Blais-Ouellette ◽  
Michel Marcelin ◽  
...  
Keyword(s):  
Dark Matter ◽  
High Resolution ◽  
Mass Distribution ◽  
Rotation Curve ◽  
Velocity Fields ◽  
Constant Density ◽  
Matter Distribution ◽  
Fabry Perot ◽  
Nearby Galaxies ◽  
Dark Matter Distribution

We present results obtained from a study of the mass distribution of 24 galaxies observed using Fabry-Pérot techniques, as part of the GHASP survey (see Russeil et al., this meeting). For each galaxy, we combined high resolution Hα rotation curves derived from 2-D velocity fields, with low resolution HI data, in order to determine accurately the inner slope of the rotation curve which strongly constrains the distribution of matter. Our work suggests the existence of a constant density core in the center of the dark halos.

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