scholarly journals Life in Low Density Environments – Field Galaxies from z=1.0 to the Present

2015 ◽  
Vol 11 (S319) ◽  
pp. 127-127
Author(s):  
Inger Jørgensen ◽  
Scott Fisher ◽  
Charity Woodrum ◽  
Teiler Kwan ◽  
Jacob Bieker
Keyword(s):  
Hubble Space Telescope ◽  
Galaxy Cluster ◽  
Stellar Populations ◽  
Low Density ◽  
Space Telescope ◽  
Cluster Galaxies ◽  
Preliminary Results ◽  
Spectroscopic Observations ◽  
Future Work

AbstractWe present results on the stellar populations of bulge-dominated field galaxies at redshifts up to ≈1.0. The sample consists of non-cluster galaxies observed as part of the spectroscopic observations for the Gemini/HST Galaxy Cluster Project (GCP). Our preliminary results show that the bulge-dominated field galaxies contain younger stellar populations than cluster galaxies at similar redshifts. Future work will include photometry from Hubble Space Telescope and will be aimed at establishing the evolution of the sizes and the mass-to-light ratios for the field galaxies.

REQUIEM-2D Methodology: Spatially Resolved Stellar Populations of Massive Lensed Quiescent Galaxies from Hubble Space Telescope 2D Grism Spectroscopy

2020 ◽  
Vol 900 (2) ◽  
pp. 184 ◽  
Author(s):  
Mohammad Akhshik ◽  
Katherine E. Whitaker ◽  
Gabriel Brammer ◽  
Guillaume Mahler ◽  
Keren Sharon ◽  
...  
Keyword(s):  
Hubble Space Telescope ◽  
Stellar Populations ◽  
Space Telescope ◽  
Spatially Resolved

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.

Internal kinematics of multiple stellar populations in globular clusters

2019 ◽  
Vol 14 (S351) ◽  
pp. 324-328
Author(s):  
Mattia Libralato
Keyword(s):  
High Precision ◽  
Globular Clusters ◽  
Hubble Space Telescope ◽  
Stellar Populations ◽  
Stellar Systems ◽  
Proper Motions ◽  
Space Telescope ◽  
Formation And Evolution ◽  
Galactic Globular Clusters ◽  
Shed Light

AbstractSpectroscopy and photometry have revealed existence, complexity and properties of the multiple stellar populations (mPOPs) hosted in Galactic globular clusters. However, the conundrum of the formation and evolution of mPOPs is far from being completely exploited: the available pieces of information seem not enough to shed light on these topics. Astrometry, and in particular high-precision proper motions, can provide us the sought-after answers about how mPOPs formed and have evolved in these ancient stellar systems. In the following, I present a brief overview of the observational results on the internal kinematics of the mPOPs in some GCs thanks to Hubble Space Telescope high-precision proper motions.

scholarly journals Photometric Calibrators for All-Sky Surveys: The GSPC-II Program

1994 ◽  
Vol 161 ◽  
pp. 301-303
Author(s):  
A. Ferrari ◽  
E.D. Siciliano ◽  
A. Pizzuti ◽  
B. Bucciarelli ◽  
G. Massone ◽  
...  
Keyword(s):  
Hubble Space Telescope ◽  
Stellar Populations ◽  
Galactic Structure ◽  
Mission Planning ◽  
Space Telescope ◽  
Sky Surveys ◽  
Star Catalog ◽  
Wide Range ◽  
The Uk ◽  
Guide Star

Accurate astrometric and photometric calibrations of all-sky photographic surveys, such as the Palomar Quick-V survey and the UK SERC-J survey, digitised for the construction of the Hubble Space Telescope Guide Star Catalog, are of extreme astrophysical value. Their wide range of applications includes, for example, galactic structure, stellar populations, extragalactic studies, and deep sky catalogs for mission planning and telescope operations. The Guide Star Photometric Catalog (GSPC-I, Lasker et al. 1988) provides stellar calibration sequences, placed approximately in the center of each survey plate, with a limiting magnitude of V = 15 mag. The goal of our program is to extend these calibrators to V = 20 mag in the Johnson-Kron-Cousins B, V and R passbands, with an accuracy of 0.05 mag. This is accomplished by taking CCD frames centered on the faintest star of each GSPC-I sequence. Typically, both long and short exposures are acquired in each field in order to link the bright and faint ends of the sequence.

scholarly journals Hubble Space Telescope spectra of the Type Ia supernova SN 2011fe: a tail of low-density, high-velocity material with Z < Z⊙

2014 ◽  
Vol 439 (2) ◽  
pp. 1959-1979 ◽  
Author(s):  
P. A. Mazzali ◽  
M. Sullivan ◽  
S. Hachinger ◽  
R. S. Ellis ◽  
P. E. Nugent ◽  
...  
Keyword(s):  
High Velocity ◽  
Hubble Space Telescope ◽  
Low Density ◽  
Space Telescope ◽  
Type Ia Supernova ◽  
Type Ia
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