Results 41 to 50 of about 348,228 (250)

Inflaton clusters and inflaton stars [PDF]

Journal of Cosmology and Astroparticle Physics, 2020
In a broad class of scenarios, inflation is followed by an extended era of matter-dominated expansion during which the inflaton condensate is nonrelativistic on subhorizon scales. During this phase density perturbations grow to the point of nonlinearity and collapse into bound structures.
Jens C. Niemeyer, Jens C. Niemeyer, Richard Easther   +2 more
openaire   +4 more sources

UOCS. XIII. Study of the Far-ultraviolet Bright Stars in the Open Cluster NGC 2420 Using AstroSat

The Astrophysical Journal
We present the study of four far-ultraviolet (FUV) bright stars in the field of the open cluster NGC 2420 using the Ultra Violet Imaging Telescope mounted on AstroSat.
R. K. S. Yadav, Arvind K. Dattatrey, Geeta Rangwal, Annapurni Subramaniam, D. Bisht, Ram Sagar   +5 more
doaj   +1 more source

The spatial distribution of star and cluster formation in M51

, 2008
Aims. We study the connection between spatially resolved star formation and young star clusters across the disc of M51. Methods. We combine star cluster data based on B, V, and I-band Hubble Space Telescope ACS imaging, together with new WFPC2 U-band ...
Alvensleben, Alvensleben, Alvensleven, Alvensleven, Bash, Bastian, Bastian, Bastian, Bastian, Bate, Beech, Bertelli, Bertin, Bik, Boeshaar, Cardelli, Charbonnel, Condon, Contopoulos, Contopoulos, de Grijs, de Grijs, Diaz, Dolphin, Efremov, Efremov, Elmegreen, Elmegreen, Elmegreen, Elmegreen, Elmegreen, Elson, Fall, Feldmeier, García-Burillo, Gieles, Gieles, Girardi, Gomez, Goodwin, H. J. G. L. M. Lamers, Helou, Hill, Holtzman, Hunter, Hwang, Jarrett, Kennicutt, Kennicutt, Kennicutt, Kennicutt, Kennicutt, Kroupa, Lada, Larsen, Larsen, Larsen, Larsen, Larson, Marsh, Meurer, Mihos, Murgia, Murphy, Murphy, Niklas, Niklas, P. Anders, Patrikeev, R. A. Scheepmaker, Roberts, S. S. Larsen, Schaerer, Scheepmaker, Schlegel, Schuster, Tamburro, Tully, Whitmore, Whitmore, Yun, Zhang, Zimmer   +82 more
core   +2 more sources

An Investigation of Open Clusters Berkeley 68 and Stock 20 Using CCD UBV and Gaia DR3 Data

The Astronomical Journal, 2023
We performed detailed photometric and astrometric analyses of the open star clusters Berkeley 68 and Stock 20. This was based on ground-based CCD UBV photometric data complemented by space-based Gaia Data Release 3 (DR3) photometry and astrometry.
Talar Yontan
doaj   +1 more source

A comprehensive set of simulations studying the influence of gas expulsion on star cluster evolution

, 2007
We have carried out a large set of N-body simulations studying the effect of residual-gas expulsion on the survival rate and final properties of star clusters.
Aarseth, Aarseth, Adams, Bastian, Binney, Boily, Boily, Churchwell, Clark, Fellhauer, Geyer, Goodwin, Goodwin, H. Baumgardt, Heggie, Hills, Hut, Kroupa, Kroupa, Kroupa, Kroupa, Kroupa, Lada, Lada, Lada, Makino, P. Kroupa, Palla, Tutukov, Weidner, Whitmore   +30 more
core   +1 more source

Lithopanspermia in Star-Forming Clusters [PDF]

Astrobiology, 2005
This paper considers the lithopanspermia hypothesis in star forming groups and clusters, where the chances of biological material spreading from one solar system to another is greatly enhanced (relative to the field) due to the close proximity of the systems and lower relative velocities. These effects more than compensate for the reduced time spent in
Adams, Fred C., Spergel, David N.
openaire   +6 more sources

The GeMS/GSAOI Galactic Globular Cluster Survey (G4CS). II. Characterization of 47 Tuc with Bayesian Statistics

The Astrophysical Journal, 2023
We present a photometric analysis of globular cluster 47 Tuc (NGC 104) using near-IR imaging data from the GeMS/GSAOI Galactic Globular Cluster Survey (G4CS), which is in operation at Gemini-South telescope.
Mirko Simunovic, Thomas H. Puzia, Bryan Miller, Eleazar R. Carrasco, Aaron Dotter, Santi Cassisi, Stephanie Monty, Peter Stetson   +7 more
doaj   +1 more source

Star clusters as building blocks for dSph galaxies formation

, 2009
We study numerically the formation of dSph galaxies. Intense star bursts, e.g. in gas-rich environments, typically produce a few to a few hundred young star clusters, within a region of just a few hundred pc.
Assmann, P., Fellhauer, M., Wilkinson, M. I.   +2 more
core   +1 more source

A Systematic Analysis of Star Cluster Disruption by Tidal Shocks. II. Predicting Star Cluster Dissolution Rates from a Time-series Analysis of Their Tidal Histories

The Astrophysical Journal
Most of the dynamical mass loss from star clusters is thought to be caused by the time variability of the tidal field (“tidal shocks”). Systematic studies of tidal shocks have been hampered by the fact that each tidal history is unique, implying both a ...
Jeremy J. Webb, Marta Reina-Campos, J. M. Diederik Kruijssen   +2 more
doaj   +1 more source

A Wide View of the Galactic Globular Cluster NGC 2808: Red Giant and Horizontal Branch Star Spatial Distributions

The Astronomical Journal, 2023
Wide-field and deep DECam multiband photometry, combined with HST data for the core of the Galactic globular cluster NGC 2808, allowed us to study the distribution of various stellar subpopulations and stars in different evolutionary phases out to the ...
Christian I. Johnson, Annalisa Calamida, Justin A. Kader, Ivan Ferraro, Catherine A. Pilachowski, Giuseppe Bono, Alessandra Mastrobuono-Battisti, Armin Rest, Alfredo Zenteno, Alice Zocchi   +9 more
doaj   +1 more source