Results 1 to 10 of about 3,387,094 (327)

THE INITIAL MASS FUNCTION OF EARLY-TYPE GALAXIES [PDF]

The Astrophysical Journal, 2010
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. Under the assumption of standard Navarro, Frenk & White dark matter halos, a combination of lensing, dynamical, and stellar population synthesis models is used to disentangle
Tommaso Treu, Matthew W. Auger, L. V. E. Koopmans, R. Gavazzi, Philip J. Marshall, A. Bolton   +5 more
core   +10 more sources

Faint Stars in a Faint Galaxy. II. The Low-mass Stellar Initial Mass Function of the Boötes I Ultrafaint Dwarf Spheroidal Galaxy [PDF]

The Astrophysical Journal, 2022
This paper presents improved constraints on the low-mass stellar initial mass function (IMF) of the Boötes I (Boo I) ultrafaint dwarf galaxy, based on our analysis of recent deep imaging from the Hubble Space Telescope.
Carrie Filion, Imants Platais, Rosemary F. G. Wyse, Vera Kozhurina-Platais   +3 more
doaj   +2 more sources

The stellar initial mass function [PDF]

Proceedings of the International Astronomical Union, 2006
Abstract The IMF UNIVERSALITY HYPOTHESIS cannot be discarded despite the existence of the CLUSTER IMF THEOREM. This means that the currently existing star-formation theory fails to describe the stellar outcome. The IGIMF THEOREM, however, predicts a variation of galaxy-wide IMFs in dependence of the galaxy's star-formation rate even if the IMF ...
Pavel Kroupa
openalex   +2 more sources

A two-step initial mass function: [PDF]

Astronomy & Astrophysics, 2001
If stars originate in transient bound clusters of moderate size, these clusters will decay due to dynamic interactions in which a hard binary forms and ejects most or all the other stars. When the cluster members are chosen at random from a reasonable initial mass function (IMF), the resulting binary characteristics do not match current observations ...
R. H. Durisen, M. Sterzik, Brian K. Pickett   +2 more
openalex   +2 more sources

Galactic Stellar and Substellar Initial Mass Function [PDF]

Publications of the Astronomical Society of the Pacific, 2003
Published version: PASP, 2003, 115, 763. A few changes.
Gilles Chabrier
openalex   +5 more sources

JWST’s PEARLS: Temperatures of Nine Highly Magnified Stars in a Galaxy at Redshift 0.94 and Simulated Stellar Population Dependence on Stellar Metallicity and the Initial Mass Function [PDF]

The Astrophysical Journal
We present stellar atmosphere modeling of JWST NIRCam photometry of nine highly magnified individual stars in a single galaxy at redshift z = 0.94 known as the Warhol arc, which is strongly lensed by the galaxy cluster MACS J0416.
Hayley Williams, Patrick L. Kelly, Rogier A. Windhorst, Alexei V. Filippenko, Amruth Alfred, Tom Broadhurst, Wenlei Chen, Christopher J. Conselice, Seth H. Cohen, José M. Diego, Benne W. Holwerda, Anton M. Koekemoer, Sung Kei Li, Ashish Kumar Meena, José M. Palencia, Massimo Ricotti, Clayton D. Robertson, Bangzheng Sun, Haojing Yan, Adi Zitrin   +19 more
doaj   +2 more sources

The Initial Mass Function of Stars and Brown Dwarfs in the Upper Sco Association [PDF]

The Astronomical Journal
I present infrared spectroscopy of 37 brown dwarf candidates in the Upper Scorpius (Upper Sco) association, 35 of which are classified as young and cool, making them likely members.
K. L. Luhman
doaj   +2 more sources

The Role of Magnetic Fields in Setting the Star Formation Rate and the Initial Mass Function [PDF]

Frontiers in Astronomy and Space Sciences, 2019
Star-forming gas clouds are strongly magnetized, and their ionization fractions are high enough to place them close to the regime of ideal magnetohydrodyamics on all but the smallest size scales.
Mark R. Krumholz, Mark R. Krumholz, Christoph Federrath, Christoph Federrath   +3 more
doaj   +2 more sources

Constraining the Initial Mass Function via Stellar Transients

Universe
The stellar initial mass function (IMF) represents a fundamental quantity in astrophysics and cosmology describing the mass distribution of stars from low mass all the way up to massive and very massive stars. It is intimately linked to a wide variety of
Francesco Gabrielli, Lumen Boco, Giancarlo Ghirlanda, Om Sharan Salafia, Ruben Salvaterra, Mario Spera, Andrea Lapi   +6 more
doaj   +3 more sources

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

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   +2 more sources