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Research paper thumbnail of Dynamical Analysis of Elliptical Galaxy Halos

We describe a non-parametric method for determining both the anisotropy and mass profiles of elli... more We describe a non-parametric method for determining both the anisotropy and mass profiles of elliptical galaxies from velocity dispersions and velocity profile shapes along the line of sight. In this way, mass-to-light ratios out to 2-3 effective radii can be derived from stellar absorption line spectroscopy. We discuss two illustrative cases, NGC 1399 and NGC 6703. So far, all ellipticals which have been analysed show evidence for dark matter dominating in the outer parts. The circular velocity curves are nearly flat, as in spiral galaxies.

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Research paper thumbnail of R.: The orbital structure and potential of NGC 1399

Accurate and radially extended stellar kinematic data reaching R = 97 ′ ′ from the center are pre... more Accurate and radially extended stellar kinematic data reaching R = 97 ′ ′ from the center are presented for the cD galaxy of Fornax, NGC 1399. The stellar rotation is small ( ≤ 30 km/s); the stellar velocity dispersion remains constant at 250-270 km/s. The deviations from Gaussian line of sight velocity distributions are small, at the percent level. We construct dynamical models of the galaxy, deprojecting its nearly round (E0-E1) surface brightness distribution, and determining the spherical distribution function that best fits (at the 4 percent level) the kinematic data on a grid of parametrized potentials. We find that the stellar orbital structure is moderately radial, with β = 0.3 ± 0.1 for R ≤ 60 ′ ′ , similar to results found for some normal giant ellipticals. The gravitational potential is dominated by the luminous component out to the last data point, with a mass-to-light ratio M/LB = 10 M⊙/L⊙, although the presence of a central black hole of M ≈ 5 × 10 8 M ⊙ is compatible ...

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Research paper thumbnail of Dynamical analysis of elliptical galaxies

Evolution of Galaxies Dynamics of Galaxies and Galactic Nuclei, 1998

ABSTRACT We describe a non-parametric method for determining both the anisotropy and mass profile... more ABSTRACT We describe a non-parametric method for determining both the anisotropy and mass profiles of elliptical galaxies from velocity dispersions and velocity profile shapes along the line of sight. In this way, mass-to-light ratios out to 2-3 effective radii can be derived from stellar absorption line spectroscopy. We discuss two illustrative cases, NGC 1399 and NGC 6703. So far, all ellipticals which have been analysed show evidence for dark matter dominating in the outer parts. The circular velocity curves are nearly flat, as in spiral galaxies.

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Research paper thumbnail of Orbital structure and mass distribution in elliptical galaxies

Astronomy and Astrophysics Supplement Series, 2000

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Research paper thumbnail of The Orbital Structure and Potential of NGC 1399

The Astronomical Journal, 2000

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Research paper thumbnail of Preprint typeset using L ATEX style emulateapj v. 20/04/00 DYNAMICAL FAMILY PROPERTIES AND DARK HALO SCALING RELATIONS OF GIANT ELLIPTICAL GALAXIES

Based on a uniform dynamical analysis of the line-profile shapes of 21 mostly luminous, slowly ro... more Based on a uniform dynamical analysis of the line-profile shapes of 21 mostly luminous, slowly rotating, and nearly round elliptical galaxies, we have investigated the dynamical family relations and dark halo properties of ellipticals. Our results include: (i) The circular velocity curves (CVCs) of elliptical galaxies are flat to within ≃ 10 % for R ∼> 0.2Re. (ii) Most ellipticals are moderately radially anisotropic; their dynamical structure is surprisingly uniform. (iii) Elliptical galaxies follow a Tully-Fisher (TF) relation with marginally shallower slope than spiral galaxies, and vmax c ≃ 300 kms −1 for an L ∗ B galaxy. At given circular velocity, they are ∼ 1 mag fainter in B and ∼ 0.6 mag in R, and appear to have slightly lower baryonic mass than spirals, even for the maximum M/LB allowed by the kinematics. (iv) The luminosity dependence of M/LB indicated by the tilt of the Fundamental Plane (FP) is confirmed. The tilt of the FP is not caused by dynamical or photometric no...

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Research paper thumbnail of Orbital Structure and Dark Haloes of Elliptical Galaxies

Not Available Printing Options Send high resolution image to Level 2 Postscript Printer Send low ... more Not Available Printing Options Send high resolution image to Level 2 Postscript Printer Send low resolution image to Level 2 Postscript Printer Send low resolution image to Level 1 Postscript Printer Get high resolution PDF image Get low resolution PDF Send 300 dpi image to PCL Printer Send 150 dpi image to PCL Printer More Article Retrieval Options HELP for Article Retrieval Bibtex entry for this abstract Preferred format for this abstract (see Preferences) Find Similar Abstracts: Use: Authors Title Keywords (in text query field) Return: Query Results Return items starting with number Query Form Database: Astronomy Physics arXiv e-prints

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Research paper thumbnail of Dynamical family properties and dark halo scaling relations of giant elliptical galaxies

The Astronomical …, 2001

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Research paper thumbnail of Dynamical Analysis of Elliptical Galaxy Halos

We describe a non-parametric method for determining both the anisotropy and mass profiles of elli... more We describe a non-parametric method for determining both the anisotropy and mass profiles of elliptical galaxies from velocity dispersions and velocity profile shapes along the line of sight. In this way, mass-to-light ratios out to 2-3 effective radii can be derived from stellar absorption line spectroscopy. We discuss two illustrative cases, NGC 1399 and NGC 6703. So far, all ellipticals which have been analysed show evidence for dark matter dominating in the outer parts. The circular velocity curves are nearly flat, as in spiral galaxies.

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Research paper thumbnail of R.: The orbital structure and potential of NGC 1399

Accurate and radially extended stellar kinematic data reaching R = 97 ′ ′ from the center are pre... more Accurate and radially extended stellar kinematic data reaching R = 97 ′ ′ from the center are presented for the cD galaxy of Fornax, NGC 1399. The stellar rotation is small ( ≤ 30 km/s); the stellar velocity dispersion remains constant at 250-270 km/s. The deviations from Gaussian line of sight velocity distributions are small, at the percent level. We construct dynamical models of the galaxy, deprojecting its nearly round (E0-E1) surface brightness distribution, and determining the spherical distribution function that best fits (at the 4 percent level) the kinematic data on a grid of parametrized potentials. We find that the stellar orbital structure is moderately radial, with β = 0.3 ± 0.1 for R ≤ 60 ′ ′ , similar to results found for some normal giant ellipticals. The gravitational potential is dominated by the luminous component out to the last data point, with a mass-to-light ratio M/LB = 10 M⊙/L⊙, although the presence of a central black hole of M ≈ 5 × 10 8 M ⊙ is compatible ...

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Research paper thumbnail of Dynamical analysis of elliptical galaxies

Evolution of Galaxies Dynamics of Galaxies and Galactic Nuclei, 1998

ABSTRACT We describe a non-parametric method for determining both the anisotropy and mass profile... more ABSTRACT We describe a non-parametric method for determining both the anisotropy and mass profiles of elliptical galaxies from velocity dispersions and velocity profile shapes along the line of sight. In this way, mass-to-light ratios out to 2-3 effective radii can be derived from stellar absorption line spectroscopy. We discuss two illustrative cases, NGC 1399 and NGC 6703. So far, all ellipticals which have been analysed show evidence for dark matter dominating in the outer parts. The circular velocity curves are nearly flat, as in spiral galaxies.

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Research paper thumbnail of Orbital structure and mass distribution in elliptical galaxies

Astronomy and Astrophysics Supplement Series, 2000

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Research paper thumbnail of The Orbital Structure and Potential of NGC 1399

The Astronomical Journal, 2000

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Research paper thumbnail of Preprint typeset using L ATEX style emulateapj v. 20/04/00 DYNAMICAL FAMILY PROPERTIES AND DARK HALO SCALING RELATIONS OF GIANT ELLIPTICAL GALAXIES

Based on a uniform dynamical analysis of the line-profile shapes of 21 mostly luminous, slowly ro... more Based on a uniform dynamical analysis of the line-profile shapes of 21 mostly luminous, slowly rotating, and nearly round elliptical galaxies, we have investigated the dynamical family relations and dark halo properties of ellipticals. Our results include: (i) The circular velocity curves (CVCs) of elliptical galaxies are flat to within ≃ 10 % for R ∼> 0.2Re. (ii) Most ellipticals are moderately radially anisotropic; their dynamical structure is surprisingly uniform. (iii) Elliptical galaxies follow a Tully-Fisher (TF) relation with marginally shallower slope than spiral galaxies, and vmax c ≃ 300 kms −1 for an L ∗ B galaxy. At given circular velocity, they are ∼ 1 mag fainter in B and ∼ 0.6 mag in R, and appear to have slightly lower baryonic mass than spirals, even for the maximum M/LB allowed by the kinematics. (iv) The luminosity dependence of M/LB indicated by the tilt of the Fundamental Plane (FP) is confirmed. The tilt of the FP is not caused by dynamical or photometric no...

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Research paper thumbnail of Orbital Structure and Dark Haloes of Elliptical Galaxies

Not Available Printing Options Send high resolution image to Level 2 Postscript Printer Send low ... more Not Available Printing Options Send high resolution image to Level 2 Postscript Printer Send low resolution image to Level 2 Postscript Printer Send low resolution image to Level 1 Postscript Printer Get high resolution PDF image Get low resolution PDF Send 300 dpi image to PCL Printer Send 150 dpi image to PCL Printer More Article Retrieval Options HELP for Article Retrieval Bibtex entry for this abstract Preferred format for this abstract (see Preferences) Find Similar Abstracts: Use: Authors Title Keywords (in text query field) Return: Query Results Return items starting with number Query Form Database: Astronomy Physics arXiv e-prints

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Research paper thumbnail of Dynamical family properties and dark halo scaling relations of giant elliptical galaxies

The Astronomical …, 2001

Bookmarks Related papers MentionsView impact