Galactic-Field IMFs of Massive Stars

Abstract

Over the past years observations of young and populous star clusters have shown that the stellar IMF appears to be an invariant featureless Salpeter power-law with an exponent alpha=2.35 for stars more massive than a few Msun. A consensus has also emerged that most, if not all, stars form in stellar groups and star clusters, and that the mass function of young star clusters in the solar-neighborhood and in interacting galaxies can be described, over the mass range of a few 10 Msun to 10^7 Msun, as a power-law with an exponent near beta=2. These two results imply that galactic-field IMFs for early-type stars cannot, under any circumstances, be a Salpeter power-law, but that they must have a steeper exponent alpha_field>2.8. This has important consequences for the distribution of stellar remnants and for the chemo-dynamical and photometric evolution of galaxies.

ApJ, accepted, 6 pages, 3 figures

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• The Pressure of the Star Forming ISM in Cosmological Simulations
• Braving the Storm: Quantifying Disk-wide Ionized Outflows in the Large Magellanic Cloud with ULLYSES
• The ALMA-CRISTAL survey: Extended [CII] emission in an interacting galaxy system at z ~ 5.5
• IMF-induced intrinsic uncertainties on measuring galaxy distances based on the number of giant stars: the case of the ultra-diffuse galaxy NGC 1052-DF2
• ALMA 1.1mm Observations of a Conservative Sample of High Redshift Massive Quiescent Galaxies in SHELA
• Environmental effects in Herschel observations of the ionized carbon content of star forming dwarf galaxies in the Virgo cluster
• Compact object populations over cosmic time II. Compact object merger rates and masses over redshift from varying initial conditions
• Stellar Populations in a semi-analytic model I: bulges of Milky Way-like galaxies
• Ionized gas in quiescent galaxies: Temperature measurement and constraint on the ionization source
• Euclid preparation. Optical emission-line predictions of intermediate-z galaxy populations in GAEA for the Euclid Deep and Wide Surveys
• Virgo Filaments V: Disrupting the Baryon Cycle in the NGC 5364 Galaxy Group
• Spectroscopic Identification of Faint White Dwarf Candidates in the Praesepe Open Star Cluster
• Energetic constraints to chemo-photometric evolution of spiral galaxies
• On the relationship between metallicity distributions of globular clusters and of circumgalactic gas
• Non-evolutionary effects on period change in Magellanic Cepheids I. New binary systems revealed from Light Travel Time Effect
• Theoretical predictions for IMF diagnostics in UV spectroscopy of star clusters
• On the primordial specific frequency of globular clusters in dwarf and giant elliptical galaxies
• The environment of TeV halo progenitors
• The formation, disruption and properties of pressure-supported stellar systems and implications for the astrophysics of galaxies
• Collective Properties of X-ray Binary Populations of Galaxies II. Pre-Low-mass X-ray Binary Properties, Formation Rates, and Constraints
• Exoplanet detection and its dependence on stochastic sampling of the stellar Initial Mass Function
• Upper limit on the fraction of alien civilizations that develop communication technology
• Interpreting Millimeter Emission from IMEGIN galaxies NGC 2146 and NGC 2976
• Compact object populations over cosmic time I. BOSSA: a Binary Object environment-Sensitive Sampling Algorithm
• The Fermi paradox: Impact of astrophysical processes and dynamical evolution
• The observed multiplicity properties of B-type stars in the Galactic young open cluster NGC 6231
• Apache Point Observatory follow-up of ACcelerating Candidate ExopLanet host Stars (APO ACCELS): Ages for 166 Accelerating Stars in the Northern Hemisphere
• Black hole merger rates for LISA and LGWA from semi-analytical modelling of light seeds
• What triggers type Ia supernovae: Prompt detonations from primordial black holes or companion stars?
• Dark-matter-induced transients over cosmic time: The role of star formation history profiles
• The influence of star clusters on galactic disks: new insights on star-formation in galaxies
• Narrowband H$\alpha$ imaging of nearby Wolf-Rayet galaxies
• When Do Stars Go BOOM?
• Monte-Carlo experiments on star-cluster induced integrated-galaxy IMF variations
• PHANGS-MUSE: the HII region luminosity function of local star-forming galaxies
• What fraction of stars formed in infrared galaxies at high redshift?
• Unraveling the Spectral Energy Distributions of Clustered YSOs
• The Initial Mass Function in disc galaxies and in galaxy clusters: the chemo-photometric picture
• Downsizing revised: Star formation timescales for elliptical galaxies with an environment-dependent IMF and number of SNIa
• Astrophotometric search for massive stars in the Milky way. Confronting Random Forest predictions with available spectroscopy
• Simulations on the survivability of Tidal Dwarf Galaxies
• A complete survey of filaments in Cygnus X
• Imladris: a detailed and flexible model for galaxy simulations with individual stars
• Merging Galaxy Clusters and the Search for New Physics of Dark Matter: A Review
• The Star Formation History in a SMC field: IAC-star/IAC-pop at work
• Galactic consequences of clustered star formation
• The mmax-Mecl relation in the LEGUS clusters
• Chemical Enrichment of Isolated Relic Galaxy Mrk1216