Results 41 to 50 of about 106,016 (255)

Galactic Rotation from Young Open Star Clusters [PDF]

Symposium - International Astronomical Union, 1980
The rotation of the Galaxy can best be studied with the aid of tracers for which distance and velocity can be obtained simultaneously, accurately and unambiguously out to large distances. Clearly, the best objects are the very young clusters. The local gradient of the angular velocity is contained in Oort's constant and, due e.g. to perturbations from
H. M. Maitzen, A.F.J. Moffat, Th. Schmidt-Kaler   +2 more
openaire   +1 more source

Constraining the Fraction of Binary Black Holes Formed in Isolation and Young Star Clusters with Gravitational-wave Data [PDF]

Astrophysical Journal, 2019
Ten binary black hole mergers have already been detected during the first two observing runs of advanced LIGO and Virgo, and many more are expected to be observed in the near future.
Y. Bouffanais, M. Mapelli, D. Gerosa, U. N. Di Carlo, N. Giacobbo, E. Berti, V. Baibhav   +6 more
semanticscholar   +1 more source

The Cosmic Evolution of Binary Black Holes in Young, Globular and Nuclear Star Clusters: Rates, Masses, Spins and Mixing Fractions [PDF]

, 2021
The growing population of binary black holes (BBHs) observed by gravitational wave detectors is a potential Rosetta stone for understanding their formation channels. Here, we use an upgraded version of our semi-analytic codes fastcluster and cosmoRate to
M. Mapelli, Y. Bouffanais, F. Santoliquido, M. A. Sedda, M. Artale   +4 more
semanticscholar   +1 more source

GW190521 formation via three-body encounters in young massive star clusters [PDF]

Monthly notices of the Royal Astronomical Society, 2021
GW190521 is the most massive binary black hole (BBH) merger observed to date, and its primary component lies in the pair-instability (PI) mass gap. Here, we investigate the formation of GW190521-like systems via three-body encounters in young massive ...
Marco Dall’Amico, M. Mapelli, U. N. Di Carlo, Y. Bouffanais, S. Rastello, F. Santoliquido, A. Ballone, M. A. Sedda   +7 more
semanticscholar   +1 more source

The young Galactic star cluster [DBS2003] 179 [PDF]

Astronomy & Astrophysics, 2008
Recent near- and mid-infrared surveys have brought evidence that the Milky Way continues to form massive clusters. We carry out a program to determine the basic physical properties of the new massive cluster candidate [DBS2003]179. Medium-resolution K-band spectra and deep near-infrared images of [DBS2003]179 were used to derive the spectral types of ...
Borissova, J., Ivanov, V. D., Hanson, M. M., Georgiev, L., Minniti, D., Kurtev, R., Geisler, D.   +6 more
openaire   +3 more sources

Discrepancies in the ages of young star clusters; evidence for mergers? [PDF]

Monthly notices of the Royal Astronomical Society, 2019
There is growing evidence that star clusters can no longer be considered simple stellar populations (SSPs). Intermediate and old age clusters are often found to have extended main sequence turn-offs (eMSTOs) which are difficult to explain with single age
Emma R. Beasor, B. Davies, N. Smith, N. Bastian   +3 more
semanticscholar   +1 more source

Effects of Close Binary Evolution on the Main-sequence Morphology of Young Star Clusters [PDF]

Astrophysical Journal, 2019
Star clusters are the building blocks of galaxies. They are composed of stars of nearly equal age and chemical composition, allowing us to use them as chronometers and as testbeds for gauging stellar evolution.
Chen Wang, N. Langer, A. Schootemeijer, N. Castro, S. Adscheid, P. Marchant, B. Hastings   +6 more
semanticscholar   +1 more source

Universal Upper End of the Stellar Initial Mass Function in the Young and Compact LEGUS Clusters

The Astrophysical Journal, 2023
We investigate the variation in the upper end of the stellar initial mass function (uIMF) in 375 young and compact star clusters in five nearby galaxies within ∼5 Mpc. All the young stellar clusters (YSCs) in the sample have ages ≲ 4 Myr and masses above
Dooseok Escher Jung, Daniela Calzetti, Matteo Messa, Mark Heyer, Mattia Sirressi, Sean T. Linden, Angela Adamo, Rupali Chandar, Michele Cignoni, David O. Cook, Clare L. Dobbs, Bruce G. Elmegreen, Aaron S. Evans, Michele Fumagalli, John S. Gallagher III, Deidre A. Hunter, Kelsey E. Johnson, Robert C. Kennicutt Jr., Mark R. Krumholz, Daniel Schaerer, Elena Sabbi, Linda J. Smith, Monica Tosi, Aida Wofford   +23 more
doaj   +1 more source

Connecting young star clusters to CO molecular gas in NGC 7793 with ALMA–LEGUS [PDF]

Monthly notices of the Royal Astronomical Society, 2018
We present an investigation of the relationship between giant molecular cloud (GMC) properties and the associated stellar clusters in the nearby flocculent galaxy NGC 7793. We combine the star cluster catalogue from the HST LEGUS (Legacy ExtraGalactic UV
K. Grasha, K. Grasha, D. Calzetti, L. Bittle, K. Johnson, J. D. Meyer, R. Kennicutt, B. Elmegreen, A. Adamo, M. Krumholz, M. Fumagalli, E. Grebel, D. Gouliermis, D. Gouliermis, D. Cook, J. Gallagher, A. Aloisi, D. Dale, S. Linden, E. Sacchi, D. Thilker, R. Walterbos, M. Messa, A. Wofford, Linda J. Smith   +24 more
semanticscholar   +1 more source

TESS Hunt for Young and Maturing Exoplanets (THYME). VII. Membership, Rotation, and Lithium in the Young Cluster Group-X and a New Young Exoplanet

The Astronomical Journal, 2022
The public, all-sky surveys Gaia and TESS provide the ability to identify new young associations and determine their ages. These associations enable study of planetary evolution by providing new opportunities to discover young exoplanets.
Elisabeth R. Newton, Rayna Rampalli, Adam L. Kraus, Andrew W. Mann, Jason L. Curtis, Andrew Vanderburg, Daniel M. Krolikowski, Daniel Huber, Grayson C. Petter, Allyson Bieryla, Benjamin M. Tofflemire, Pa Chia Thao, Mackenna L. Wood, Ronan Kerr, Boris S. Safanov, Ivan A. Strakhov, David R. Ciardi, Steven Giacalone, Courtney D. Dressing, Holden Gill, Arjun B. Savel, Karen A. Collins, Peyton Brown, Felipe Murgas, Keisuke Isogai, Norio Narita, Enric Palle, Samuel N. Quinn, Jason D. Eastman, Gábor Fűrész, Bernie Shiao, Tansu Daylan, Douglas A. Caldwell, George R. Ricker, Roland Vanderspek, Sara Seager, Joshua N. Winn, Jon M. Jenkins, David W. Latham   +38 more
doaj   +1 more source