Results 1 to 10 of about 3,434,376 (288)

A discontinuity in the low-mass initial mass function [PDF]

The Astrophysical Journal, 2007
The origin of brown dwarfs (BDs) is still an unsolved mystery. While the standard model describes the formation of BDs and stars in a similar way recent data on the multiplicity properties of stars and BDs show them to have different binary distribution ...
Bate M. R., Duchene G., Duquennoy A., Ingo Thies, Kroupa P., Kroupa P., Metchev S., Pavel Kroupa, Price N. M., Weidner C.   +9 more
core   +3 more sources

The initial mass function of early-type galaxies [PDF]

The Astrophysical Journal, 2009
We determine an absolute calibration of the initial mass function (IMF) of early-type galaxies, by studying a sample of 56 gravitational lenses identified by the SLACS Survey.
Adam S. Bolton, Auger, Bell, Bernardi, Bernardi, Bolton, Bolton, Bolton, Brinchmann, Bundy, de Vaucouleurs, Elmegreen, Gavazzi, Gavazzi, Gerhard, Gnedin, Graves, Humphrey, Jaffe, Jiang, Jimenez, Koopmans, Koopmans, Koopmans, Léon V. E. Koopmans, Matthew W. Auger, Navarro, Newman, Pellegrini, Philip J. Marshall, Raphaël Gavazzi, Sand, Schulz, Thomas, Tommaso Treu, Treu, Treu, Treu, Treu, van Dokkum   +39 more
core   +7 more sources

The fragmentation properties of massive star-forming regions in 30Dor-10 at 2000 au resolution [PDF]

Nature Communications
The fragmentation properties of parsec- scale clumps play a fundamental role in shaping the dense gas condensations known as cores, the immediate progenitor of stars.
Alessio Traficante, María J. Jiménez-Donaire, Remy Indebetouw, Tony Wong, Alice Nucara, Ralf S. Klessen, Patrick Hennebelle, Ugo Lebreuilly, Chiara Mininni, Sergio Molinari, Elena Sabbi, Juan D. Soler   +11 more
doaj   +2 more sources

Constraining the Initial Mass Function in the Epoch of Reionization from Astrophysical and Cosmological Data

Universe
We aim to constrain the stellar initial mass function (IMF) during the epoch of reionization. To this purpose, we build up a semi-empirical model for the reionization history of the Universe based on various ingredients: the latest determination of the ...
Andrea Lapi, Giovanni Gandolfi, Lumen Boco, Francesco Gabrielli, Marcella Massardi, Balakrishna S. Haridasu, Carlo Baccigalupi, Alessandro Bressan, Luigi Danese   +8 more
doaj   +3 more sources

Probing the Milky Way Stellar and Brown Dwarf Initial Mass Function with Modern Microlensing Observations

The Astrophysical Journal Letters, 2023
We use recent microlensing observations toward the central bulge of the Galaxy to probe the overall stellar plus brown dwarf initial mass function (IMF) in these regions well within the brown dwarf domain. We find that the IMF is consistent with the same
Gilles Chabrier, Romain Lenoble
doaj   +1 more source

The Initial Mass Function and Other Stellar Properties Across the Core of the Hydra I Cluster

The Astrophysical Journal, 2023
The Hydra I cluster offers an excellent opportunity to study and compare the relic old stellar populations in the core of its two brightest galaxies. In addition, the differing kinematics of the two galaxies allows a test of the local validity of general
Ilaria Lonoce, W. L. Freedman, A. Feldmeier-Krause   +2 more
doaj   +1 more source

Variation of the High-mass Slope of the Stellar Initial Mass Function: Theory Meets Observations

The Astrophysical Journal, 2023
We present observational evidence of a correlation between the high-mass slope of the stellar initial mass function (IMF) in young star clusters and their stellar surface density, σ _* .
Sami Dib
doaj   +1 more source

A Novel Survey for Young Substellar Objects with the W-band Filter. VI. Spectroscopic Census of Substellar Members and the IMF of the σ Orionis Cluster

The Astrophysical Journal, 2023
Low-mass stars and substellar objects are essential in tracing the initial mass function (IMF). We study the nearby young σ Orionis cluster ( d ∼ 408 pc, age ∼ 1.8 Myr) using deep near-infrared (NIR) photometric data in the J , W , and H bands from ...
Belinda Damian, Jessy Jose, Beth Biller, Gregory J. Herczeg, Loïc Albert, Katelyn Allers, Zhoujian Zhang, Michael C. Liu, Sophie Dubber, KT Paul, Wen-Ping Chen, Bhavana Lalchand, Tanvi Sharma, Yumiko Oasa   +13 more
doaj   +1 more source

Modeling a high mass turn down in the stellar initial mass function [PDF]

, 1999
Statistical sampling from the stellar initial mass function (IMF) for all star-forming regions in the Galaxy would lead to the prediction of ~1000 Msun stars unless there is a rapid turn-down in the IMF beyond several hundred solar masses.
Beech M., Bonnell I. A., Bruce G. Elmegreen, Elmegreen B. G., Elmegreen B. G., Giersz M., Heithausen A., Kahn F. D., Kroupa P., Larson R. B., Larson R. B., Larson R. B., Larson R. B., McDonald J. M., Pfenniger D., Price N. M., Sagar R., Sagar R., Scalo J. M., Selman F., Stutzki J., Subramaniam A., Terlevich R., Testi L., Vogelaar M. G. R., Weigelt G.   +25 more
core   +3 more sources

A Value-added COSMOS2020 Catalog of Physical Properties: Constraining Temperature-dependent Initial Mass Function

The Astrophysical Journal Supplement Series, 2023
This work presents and releases a catalog of new photometrically derived physical properties for the ∼10 ^5 most well-measured galaxies in the COSMOS field on the sky.
Vadim Rusakov, Charles L. Steinhardt, Albert Sneppen   +2 more
doaj   +1 more source