scholarly journals Hubble Space Telescope photometry of the central regions of Virgo Cluster elliptical galaxies. 1: Observations, discussion, and conclusions

1994 ◽  
Vol 108 ◽  
pp. 1567 ◽  
Author(s):  
W. Jaffe ◽  
H. C. Ford ◽  
R. W. O'Connell ◽  
F. C. van den Bosch ◽  
L. Ferrarese
Keyword(s):  
Hubble Space Telescope ◽  
Elliptical Galaxies ◽  
Virgo Cluster ◽  
Space Telescope ◽  
Central Regions

Hubble Space Telescope photometry of the central regions of Virgo cluster elliptical galaxies. 3: Brightness profiles

1994 ◽  
Vol 108 ◽  
pp. 1598 ◽  
Author(s):  
L. Ferrarese ◽  
F. C. van den Bosch ◽  
H. C. Ford ◽  
W. Jaffe ◽  
R. W. O'Connell
Keyword(s):  
Hubble Space Telescope ◽  
Elliptical Galaxies ◽  
Virgo Cluster ◽  
Space Telescope ◽  
Central Regions

scholarly journals Hubble Space Telescope photometry of the central regions of Virgo cluster elliptical galaxies. II: Isophote shapes.

1994 ◽  
Vol 108 ◽  
pp. 1579 ◽  
Author(s):  
Frank C. van den Bosch ◽  
Laura Ferrarese ◽  
Walter Jaffe ◽  
Holland C. Ford ◽  
Robert W. O'Connell
Keyword(s):  
Hubble Space Telescope ◽  
Elliptical Galaxies ◽  
Virgo Cluster ◽  
Space Telescope ◽  
Central Regions

scholarly journals Hubble Space Telescope Studies of the Dense Central Regions of Globular Clusters

1996 ◽  
Vol 174 ◽  
pp. 19-28
Author(s):  
Puragra Guhathakurta ◽  
Brian Yanny ◽  
Donald P. Schneider ◽  
John N. Bahcall
Keyword(s):  
Density Profile ◽  
Globular Clusters ◽  
Hubble Space Telescope ◽  
Stellar Populations ◽  
Core Collapse ◽  
Red Giants ◽  
Space Telescope ◽  
Blue Straggler ◽  
Central Regions ◽  
Stellar Density

We present results from an ongoing program to probe the dense central parts of Galactic globular clusters using multicolor Hubble Space Telescope images (WF/PC-I and WFPC2). Our sample includes the dense clusters M15, 47 Tuc, M30, NGC 6624, M3 and M13. The two main goals of our program are to measure the shape of stellar density profile in clusters (the slope of the density cusp in post core collapse clusters, in particular) and to understand the nature of evolved stellar populations in very dense regions and their variation as a function of radius. The latter includes studies of blue straggler stars and of the central depletion of bright red giants. Our recent WFPC2 study of M15 is described in detail.

scholarly journals The Central Kiloparsec-Scale Structure of Galaxies

2001 ◽  
Vol 205 ◽  
pp. 154-161 ◽  
Author(s):  
Roeland P. van der Marel
Keyword(s):  
Recent Work ◽  
Spiral Galaxies ◽  
Hubble Space Telescope ◽  
Elliptical Galaxies ◽  
Scale Structure ◽  
Space Telescope ◽  
Near Ir ◽  
Ir Imaging ◽  
Imaging And Spectroscopy

This review summarizes some aspects of the central kiloparsec scale structure of galaxies, and in particular spiral galaxies, elliptical galaxies and merger remnants. The focus is on results from optical and near-IR imaging and spectroscopy, with emphasis on recent work with the Hubble Space Telescope.

Hubble Space Telescope observations of the centers of elliptical galaxies

1996 ◽  
pp. 293-306 ◽  
Author(s):  
H. Ford ◽  
L. Ferrarese ◽  
G. Hartig ◽  
W. Jaffe ◽  
Z. Tsvetanov ◽  
...  
Keyword(s):  
Hubble Space Telescope ◽  
Elliptical Galaxies ◽  
Space Telescope

scholarly journals Hubble Space Telescope photometry of multiple stellar populations in the inner parts of NGC 2419

2019 ◽  
Vol 624 ◽  
pp. A25 ◽  
Author(s):  
Søren S. Larsen ◽  
Holger Baumgardt ◽  
Nate Bastian ◽  
Svea Hernandez ◽  
Jean Brodie
Keyword(s):  
Hubble Space Telescope ◽  
Dynamical Evolution ◽  
Bimodal Distribution ◽  
Wide Field ◽  
Red Giants ◽  
Space Telescope ◽  
Deep Imaging ◽  
Central Regions ◽  
Average Rotation ◽  
The Difference

We present new deep imaging of the central regions of the remote globular cluster NGC 2419, obtained with the F343N and F336W filters of the Wide Field Camera 3 on board the Hubble Space Telescope. The new data are combined with archival imaging to constrain nitrogen and helium abundance variations within the cluster. We find a clearly bimodal distribution of the nitrogen-sensitive F336W–F343N colours of red giants, from which we estimate that about 55% of the giants belong to a population with about normal (field-like) nitrogen abundances (P1), while the remaining 45% belong to a nitrogen-rich population (P2). On average, the P2 stars are more He-rich than the P1 stars, with an estimated mean difference of ΔY ≃ 0.05, but the P2 stars exhibit a significant spread in He content and some may reach ΔY ≃ 0.13. A smaller He spread may also be present for the P1 stars. Additionally, stars with spectroscopically determined low Mg abundances ([Mg/Fe] <  0) are generally associated with P2. We find the P2 stars to be slightly more centrally concentrated in NGC 2419 with a projected half-number radius of about 10% less than for the P1 stars, but the difference is not highly significant (p ≃ 0.05). Using published radial velocities, we find evidence of rotation for the P1 stars, whereas the results are inconclusive for the P2 stars, which are consistent with no rotation as well as the same average rotation found for the P1 stars. Because of the long relaxation time scale of NGC 2419, the radial trends and kinematic properties of the populations are expected to be relatively unaffected by dynamical evolution. Hence, they provide constraints on formation scenarios for multiple populations, which must account not only for the presence of He spreads within sub-populations identified via CNO variations, but also for the relatively modest differences in the spatial distributions and kinematics of the populations.

Distance to the Virgo cluster galaxy M100 from Hubble Space Telescope observations of Cepheids

Nature ◽  
1994 ◽  
Vol 371 (6500) ◽  
pp. 757-762 ◽  
Author(s):  
Wendy L. Freedman ◽  
Barry F. Madore ◽  
Jeremy R. Mould ◽  
Robert Hill ◽  
Laura Ferrarese ◽  
...  
Keyword(s):  
Hubble Space Telescope ◽  
Virgo Cluster ◽  
Cluster Galaxy ◽  
Space Telescope
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