Results 81 to 90 of about 176,382 (265)

Fraction of Stars in Clusters for the LEGUS Dwarf Galaxies [PDF]

, 2022
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 between the ensemble properties of the cluster populations and those of their ...
D. Cook, J. Lee, A. Adamo, D. Calzetti, R. Chandar, B. Whitmore, A. Aloisi, M. Cignoni, D. Dale, B. Elmegreen, M. Fumagalli, K. Grasha, K. Johnson, R. Kennicutt, H. Kim, S. Linden, M. Messa, G. Ostlin, J. Ryon, E. Sacchi, D. Thilker, M. Tosi, A. W. CaltechIPAC, Pasadena, Ca, USA., D. Astronomy, U. Arizona, Tucson, Az, Gemini ObservatoryNOIRLab, The Oskar Klein Centre, S. University, Stockholm, Sweden., U. O. M. Amherst, Amherst, Ma, D. Physics, Astronomy, U. Toledo, Toledo, Oh, Space Telescope Science Institute, Baltimore., Md, D. Physics, University of Pisa, Pisa, Italy., Infn, I. D. A. E. S. D. Spazio, Bologna, U. Wyoming, Laramie, Wy, Ibm Research Division, T. J. W. R. Center, Yorktown Hts., Ny, Dipartimento di Fisica G. Occhialini, U. Bicocca, Milano, Research School for Astronomy, Astrophysics, Australian National University, Canberra, Australia., U. Virginia, Charlottesville, Va, S. Observatory, P. George, C. N. Y. I. F. T. Physics, Texas A M University, College Station, Tx, G. Observatory, L. Serena, Chile., Observatoire de Geneve, U. Geneva, Geneva, Switzerland., Bologna University, T. J. H. University, I. D. Astronomia, Universidad Autonoma de Mexico, Unidad Acad'emica en Ensenada, Ensenada, Mexico.   +90 more
semanticscholar   +1 more source

Witnessing a Transformation to Blue-cored Dwarf Early-type Galaxies in Filaments and the Cluster Outskirts: Gas-phase Abundances and Internal Kinematics Perspectives

The Astrophysical Journal, 2023
The presence of transitional dwarf galaxies in filaments and cluster outskirts may be closely related to preprocessing in the filament; however, the underlying mechanism is not yet comprehensively understood.
Jiwon Chung, Joon Hyeop Lee, Hyunjin Jeong, Suk Kim   +3 more
doaj   +1 more source

UGC 7639: A Dwarf Galaxy in the Canes Venatici I Cloud

Advances in Astronomy, Volume 2015, Issue 1, 2015., 2015
We want to get insight into the formation mechanism and the evolution of UGC 7639, a dwarf galaxy in the Canes Venatici I Cloud (CVnIC). We used archival multiwavelength data to constrain its global properties. Ultraviolet images show that UGC 7639 inner regions are composed mostly by young stellar populations.
L. M. Buson, D. Bettoni, P. Mazzei, G. Galletta, Duncan Forbes   +4 more
wiley   +1 more source

Pavo: Discovery of a Star-forming Dwarf Galaxy Just Outside the Local Group

The Astrophysical Journal Letters, 2023
We report the discovery of Pavo, a faint ( M _V = −10.0), star-forming, irregular, and extremely isolated dwarf galaxy at D ≈ 2 Mpc. Pavo was identified in Dark Energy Camera Legacy Survey imaging via a novel approach that combines low surface brightness
Michael G. Jones, Burçin Mutlu-Pakdil, David J. Sand, Richard Donnerstein, Denija Crnojević, Paul Bennet, Catherine E. Fielder, Ananthan Karunakaran, Kristine Spekkens, Jay Strader, Ryan Urquhart, Dennis Zaritsky   +11 more
doaj   +1 more source

Formation of dwarf ellipticals and dwarf irregular galaxies by interaction of giant galaxies under environmental influence [PDF]

, 2014
A model is proposed for the formation of gas-rich dwarf irregular galaxies and gas-poor, rotating dwarf elliptical galaxies following the interaction between two giant galaxies as a function of space density. The formation of dwarf galaxies is considered to depend on a random variable, the tidal index theta, an environmental parameter defined by ...
arxiv   +1 more source

Chemical and Photometric Evolution Models for Disk, Irregular, and Low Mass Galaxies

Advances in Astronomy, Volume 2014, Issue 1, 2014., 2014
We summarize the updated set of multiphase chemical evolution models performed with 44 theoretical radial mass initial distributions and 10 possible values of efficiencies to form molecular clouds and stars. We present the results about the infall rate histories, the formation of the disk, and the evolution of the radial distributions of diffuse and ...
Mercedes Mollá, Jorge Iglesias Páramo
wiley   +1 more source

HST FUV Spectroscopy of Super Star Cluster A in the Green Pea Analog Mrk 71: Revealing the Presence of Very Massive Stars

The Astrophysical Journal, 2023
Mrk 71 is a low-metallicity ( Z = 0.16 Z _☉ ) starburst region in the local dwarf galaxy NGC 2366, hosting two super star clusters (SSCs A and B), and it is recognized as a Green Pea (GP) analog with SSC A responsible for the GP properties.
Linda J. Smith, M. S. Oey, Svea Hernandez, Jenna Ryon, Claus Leitherer, Stephane Charlot, Gustavo Bruzual, Daniela Calzetti, You-Hua Chu, Matthew J. Hayes, Bethan L. James, Anne E. Jaskot, Göran Östlin   +12 more
doaj   +1 more source

The Unique Structural Parameters of the Underlying Host Galaxies in Blue Compact Dwarfs [PDF]

, 2014
The nature of possible evolutionary pathways between various types of dwarf galaxies is still not fully understood. Blue compact dwarf galaxies (BCDs) provide a unique window into dwarf galaxy formation and evolution and are often thought of as an evolutionary stage between different classes of dwarf galaxies. In this study we use deep optical and near-
arxiv   +1 more source

Morphological Evolution of Dwarf Galaxies in the Local Group [PDF]

, 2003
The dwarf galaxies of the Local Group can be separated in three morphological groups: irregular, elliptical and spheroidal. As in the large galaxy clusters, there seems to be a morphology-position relationship: irregular galaxies are preferentially found in the outskirts (low density regions) of the Local Group, whereas dwarf ellipticals and ...
arxiv   +1 more source

Diffuse Ionized Gas in the Dwarf Irregular Galaxy DDO 53 [PDF]

Astron.J.134:1447-1458,2007, 2007
The spectral characteristics throughout the dwarf irregular galaxy DDO 53 are studied. The results are very similar to those for other irregular galaxies: high excitation and low values of the [SII]/Halpha ratio. The most likely ionization source is photon leakage from the classical HII regions, without any other source, although the interstellar ...
arxiv   +1 more source