Results 101 to 110 of about 37,027 (256)
ON THE STAR FORMATION LAW FOR SPIRAL AND IRREGULAR GALAXIES [PDF]
The Astrophysical Journal, 2015 A dynamical model for star formation on a galactic scale is proposed in which the interstellar medium is constantly condensing to star-forming clouds on the dynamical time of the average midplane density, and the clouds are constantly being disrupted on the dynamical time scale appropriate for their higher density.
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FIGGS Faint Irregular Galaxies GMRT Survey [PDF]
, 2008 The Faint Irregular Galaxies GMRT Survey (FIGGS) is a large program aimed at providing a comprehensive and statistically robust characterisation of the neutral ISM properties of faint (M_B > -14.5), nearby, gas rich, dwarf irregular galaxies using the Giant Metrewave Radio Telescope (GMRT). Here we briefly describe the survey and discuss some of the
Begum, Ayesha +4 more
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Ultradeep Imaging of Nearby Dwarf Irregular Galaxies: Young Objects in the Far Outer Disk
The Astronomical JournalUltradeep UBVI imaging of 10 nearby (≤7.8 Mpc) noninteracting dwarf irregular galaxies are used to examine their far outer stellar disks. The annulus between 26 mag arcsec ^−2 and 29 mag arcsec ^−2 in the V band is what we define as the far outer disk ...
Deidre A. Hunter +6 more
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Fragmentation of Expanding Shells in Spiral and Irregular Galaxies
Astronomy & Astrophysics, 1997 Conditions for the fragmentation of expanding shells due to gravitational instability are discussed. The self-similar analytical solution is compared with the results of 3-dimensional computer simulations for the expansion into homogeneous media. For realistic galactic disks we show that the formation of fragments is influenced by the amount of energy ...
Ehlerova, Sona +3 more
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A γ-Ray-emitting Collisional Ring Galaxy System in Our Galactic Neighborhood
The Astrophysical Journal LettersThe astrophysical γ -ray photons carry the signatures of the violent phenomena happening on various astronomical scales in our Universe. This includes supernova remnants, pulsars, and pulsar wind nebulae in the Galactic environment and extragalactic ...
Vaidehi S. Paliya, D. J. Saikia
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Galaxy Morphological Classification with Zernike Moments and Machine Learning Approaches
The Astrophysical Journal Supplement SeriesClassifying galaxies is an essential step for studying their structures and dynamics. Using GalaxyZoo2 (GZ2) fractions thresholds, we collect 545 and 11,735 samples in nongalaxy and galaxy classes, respectively.
Hamed Ghaderi +2 more
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Interstellar gas motions around massive star formation regions in the nearby dwarf galaxy DDO43
Acta PolytechnicaAreas of massive star formation are strongly influenced by stellar winds and supernovae, therefore, enhanced turbulent flows are expected. We analyse high-quality Karl G. Jansky Very Large Array observations of the neutral hydrogen gas content of DDO43,
Enikő Pichler +4 more
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Recent star formation history of the dwarf irregular galaxy Leo A [PDF]
, 2022 Alina Leščinskaitė +2 more
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A Luminous X-Ray Active Galactic Nucleus in the Dwarf–Dwarf Galaxy Merger RGG 66
The Astrophysical JournalWe present the discovery of a luminous X-ray active galactic nucleus (AGN) in the dwarf galaxy merger RGG 66. The black hole is predicted to have a mass of M _BH ∼ 10 ^5.4 M _⊙ and to be radiating close to its Eddington limit ( L _bol / L _Edd ∼ 0.75 ...
Seth J. Kimbrell, Amy E. Reines
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UniverseDistinguishing galaxies as either fast or slow rotators plays a vital role in understanding the processes behind galaxy formation and evolution. Standard techniques, which are based on the λR spin parameter obtained from stellar kinematics, frequently ...
Amirmohammad Chegeni +4 more
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