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Pressure and Star Formation in LITTLE THINGS Dwarf Irregular Galaxies
Bruce G. Elmegreen, Deidre A. Hunter, Edvige Corbelli
The surface densities of star formation, Sigma_SFR, in 24 dwarf irregular (dIrr) galaxies from the LITTLE THINGS survey are combined with gas surface densities and midplane pressur…
Stellar Populations and Molecular Gas Composition in the Low-Metallicity Environment of WLM
Haylee N. Archer, Deidre A. Hunter, Bruce G. Elmegreen +8
We investigate the stellar populations and molecular gas properties of a star-forming region within the dwarf irregular (dIrr) galaxy WLM. Low-metallicity dIrrs like WLM offer a va…
AstroSat UV Deep Field South -- I. Far and Near-ultraviolet Source Catalog of the GOODS South region
Kanak Saha, Soumil Maulick, Pushpak Pandey +11
We present the AstroSat UV Deep Field South (AUDFs), an imaging survey using the wide-field Ultraviolet Imaging Telescope on board AstroSat. AUDFs covers arcmin of…
Probing the relationship between early star formation and CO in the dwarf irregular galaxy WLM with JWST
Haylee N. Archer, Deidre A. Hunter, Bruce G. Elmegreen +5
Wolf-Lundmark-Melotte (WLM) is a Local Group dwarf irregular (dIrr) galaxy with a metallicity 13% of solar. At 1 Mpc, the relative isolation of WLM provides a unique opportunity to…
Spatial segregation of massive clusters in a simulation of colliding dwarf galaxies
Bruce G. Elmegreen, Natalia Lahen
The collective properties of star clusters are investigated using a simulation of the collision between two dwarf galaxies. The characteristic power law of the cluster mass functio…
Feedback and galaxy dynamics: A study of turbulence and star formation in 34 galaxies using the PHANGS survey
Bruce G. Elmegreen
The correlation between interstellar turbulent speed and local star formation rate surface density, Sigma_SFR, is studied using CO observations in the PHANGS survey. The local velo…
The Interstellar Medium in Dwarf Irregular Galaxies
Deidre A. Hunter, Bruce G. Elmegreen, Suzanne C. Madden
Dwarf irregulars (dIrrs) are among the most common type of galaxy in the Universe. They typically have gas-rich, low surface-brightness, metal-poor, and relatively-thick disks. Her…
ALMA-LEGUS II: The Influence of Sub-Galactic Environment on Molecular Cloud Properties
Molly K. Finn, Kelsey E. Johnson, Remy Indebetouw +24
We compare the molecular cloud properties in sub-galactic regions of two galaxies, barred spiral NGC 1313, which is forming many massive clusters, and flocculent spiral NGC 7793, w…
ALMA-LEGUS I: The Influence of Galaxy Morphology on Molecular Cloud Properties
Molly K. Finn, Kelsey E. Johnson, Remy Indebetouw +24
We present a comparative study of the molecular gas in two galaxies from the LEGUS sample: barred spiral NGC 1313 and flocculent spiral NGC 7793. These two galaxies have similar ma…
Neutral atomic and molecular clouds and star formation in the outer Carina arm
Geumsook Park, Bon-Chul Koo, Kee-Tae Kim +1
We present a comprehensive investigation of HI (super)clouds, molecular clouds (MCs), and star formation in the Carina spiral arm of the outer Galaxy. Utilizing HI4PI and CfA CO su…
Universal Upper End of the Stellar Initial Mass Function in the Young and Compact LEGUS clusters
Dooseok Escher Jung, Daniela Calzetti, Matteo Messa +21
We investigate the variation in the upper end of stellar initial mass function (uIMF) in 375 young and compact star clusters in five nearby galaxies within Mpc. All the yo…
Exponential galaxy discs as the quasi-stationary distribution in a Markov chain model simulating stellar scattering
Jian Wu, Curtis Struck, Bruce G. Elmegreen +1
Previous models have shown that stochastic scattering of stars in a two-dimensional galaxy disc can generate a time-independent surface density distribution that is an exponential…
Diverse Molecular Structures Across The Whole Star-Forming Disk of M83: High fidelity Imaging at 40pc Resolution
Jin Koda, Akihiko Hirota, Fumi Egusa +23
We present high-fidelity CO(1-0) imaging of molecular gas across the full star-forming disk of M83, using ALMA's 12m, 7m, and TP arrays and the MIRIAD package. The data have a mass…
Fraction of Stars in Clusters for the LEGUS Dwarf Galaxies
D. O. Cook, J. C. Lee, A. Adamo +20
We study the young star cluster populations in 23 dwarf and irregular galaxies observed by the HST Legacy ExtraGalactic Ultraviolet Survey (LEGUS), and examine relationships betwee…
Hubble Space Telescope Observations of Tadpole Galaxies Kiso 3867, SBS0, SBS1, and UM461
Debra Meloy Elmegreen, Bruce G. Elmegreen, John S. Gallagher +8
Tadpole galaxies are metal-poor dwarfs with typically one dominant star-forming region, giving them a head-tail structure when inclined. A metallicity drop in the head suggests tha…
Orbits and action changes during star-clump encounters responsible for the origin of exponential discs in dwarf galaxies
Jian Wu, Curtis Struck, Bruce G. Elmegreen +1
Previous studies found that stellar scattering by massive clumps can lead to the formation of exponential profiles in galaxy discs, but details on how a star is moved around have n…
Extended far-ultraviolet emission in distant dwarf galaxies
Anshuman Borgohain, Kanak Saha, Bruce Elmegreen +3
Blue Compact Dwarfs (BCDs) are low-luminosity (M mag), metal-poor ( ), centrally concentrated galaxies with bright clumps…
Star Cluster Formation and Evolution in M101: An Investigation with the Legacy Extragalactic UV Survey
S. T. Linden, G. Perez, D. Calzetti +13
We present Hubble Space Telescope WFC3/UVIS (F275W, F336W) and ACS/WFC optical (F435W, F555W, and F814W) observations of the nearby grand-design spiral galaxy M101 as part of the L…
The Dense Gas Mass Fraction and the Relationship to Star Formation in M51
Mark Heyer, Benjamin Gregg, Daniela Calzetti +15
Observations of 12CO J=1-0 and HCN J=1-0 emission from NGC 5194 (M51) made with the 50~meter Large Millimeter Telescope and the SEQUOIA focal plane array are presented. Using the H…
A Search for correlations between turbulence and star formation in THINGS galaxies
Bruce G. Elmegreen, Zorayda Martinez, Deidre A. Hunter
The spatial range for feedback from star formation varies from molecular cloud disruption on parsec scales to supershells and disk blowout on kiloparsec scales. The relative amount…
The Environments of CO Cores and Star Formation in the Dwarf Irregular Galaxy WLM
Haylee N. Archer, Deidre A. Hunter, Bruce G. Elmegreen +5
The low metallicities of dwarf irregular galaxies (dIrr) greatly influence the formation and structure of molecular clouds. These clouds, which consist primarily of H, are typi…
The Dependence of the Hierarchical Distribution of Star Clusters on Galactic Environment
Shyam H. Menon, Kathryn Grasha, Bruce G. Elmegreen +15
We use the angular Two Point Correlation Function (TPCF) to investigate the hierarchical distribution of young star clusters in 12 local (3--18 Mpc) star-forming galaxies using sta…
The mass-metallicity relation at z~1-2 and its dependence on star formation rate
Alaina Henry, Marc Rafelski, Ben Sunnquist +24
We present a new measurement of the gas-phase mass-metallicity relation (MZR), and its dependence on star formation rates (SFRs) at 1.3 < z < 2.3. Our sample comprises 1056 galaxie…
Photometric Observations of Dwarf Galaxies
Phil Cigan, Lisa M. Young, Haley L. Gomez +5
We present here far-infrared photometry of galaxies in a sample that is relatively unexplored at these wavelengths: low-metallicity dwarf galaxies with moderate star formation rate…