Results 11 to 20 of about 12,211 (252)
Giant Halos in Dwarf Irregular Galaxies vs. Dwarf Elliptical Galaxies [PDF]
Proceedings of the International Astronomical Union, 2005 We present a discovery of a giant stellar halo in NGC 6822, a dwarf irregular galaxy in the Local Group. This halo is mostly made of old red giants, showing striking features: 1) it is several times larger than the main body of the galaxy seen in the ...
Hwang, Narae, Lee, Myung Gyoon
core +4 more sources
DDO 43: A Prototypical Dwarf Irregular Galaxy? [PDF]
The Astronomical Journal, 2005 We present sensitive and high resolution 21 cm observations of the dwarf irregular (dIm) galaxy DDO 43, in conjunction with optical broad and narrow band images in U, B, V, and Halpha. The observations are used to examine the relationship between its HI morphology and kinematics to past and present star formation.
Caroline E. Simpson +2 more
openalex +5 more sources
The natural science underlying big history. [PDF]
ScientificWorldJournal, 2014 Nature’s many varied complex systems—including galaxies, stars, planets, life, and society—are islands of order within the increasingly disordered Universe. All organized systems are subject to physical, biological, or cultural evolution, which together comprise the grander interdisciplinary subject of cosmic evolution.
Chaisson EJ.
europepmc +2 more sources
A STAR FORMATION LAW FOR DWARF IRREGULAR GALAXIES [PDF]
The Astrophysical Journal, 2015 The radial profiles of gas, stars, and far ultraviolet radiation in 20 dwarf Irregular galaxies are converted to stability parameters and scale heights for a test of the importance of two-dimensional (2D) instabilities in promoting star formation. A detailed model of this instability involving gaseous and stellar fluids with self-consistent thicknesses
Bruce G. Elmegreen, Deidre A. Hunter
openalex +5 more sources
The Sagittarius dwarf irregular galaxy: Metallicity and stellar populations [PDF]
Astronomy & Astrophysics, 2002 10 pages, 7 figures, accepted A& ...
Y. Momany +3 more
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THE OUTER DISKS OF DWARF IRREGULAR GALAXIES [PDF]
The Astronomical Journal, 2011 AJ, in ...
Deidre A. Hunter +14 more
openaire +4 more sources
Commodity risk assessment of Quercus robur plants from the UK
EFSA Journal, Volume 21, Issue 10, October 2023., 2023 Abstract The European Commission requested the EFSA Panel on Plant Health to prepare and deliver risk assessments for commodities listed in Commission Implementing Regulation (EU) 2018/2019 as ‘High‐risk plants, plant products and other objects’. This Scientific Opinion covers plant health risks posed by plants of Quercus robur imported from the UK as:
EFSA Panel on Plant Health (PLH) +29 more
wiley +1 more source
The intrinsic shapes of dwarf irregular galaxies [PDF]
Monthly Notices of the Royal Astronomical Society: Letters, 2013 Abstract We use the measured B-band axial ratios of galaxies from an updated catalogue of Local Volume galaxies to determine the intrinsic shape of dwarf irregular galaxies (de Vaucouleurs’ morphological types 8–10). We find that the shapes change systematically with luminosity, with fainter galaxies being thicker.
Roychowdhury, Sambit +3 more
openaire +3 more sources
Chemical abundances in the dwarf galaxy NGC 4163 based on the nebular and auroral emission lines
Astronomische Nachrichten, Volume 343, Issue 9-10, November-December 2022., 2022 Abstract We constructed an oxygen abundance map and N/O ratio map of the unusually low excitation dwarf irregular galaxy NGC 4163 based on publicly available spectroscopy obtained by the MaNGA survey. We detected auroral emission line [O II]λλ$$ \lambda \lambda $$7320,7330 which allows us to measure chemical abundance by direct Te$$ {\mathrm{T}}_e ...
I. A. Zinchenko, L. S. Pilyugin
wiley +1 more source
Kinematics of the dwarf irregular galaxy GR8 [PDF]
Astronomy & Astrophysics, 2003 We present deep, high velocity resolution (~1.6 km/s) Giant Meterwave Radio Telescope HI 21cm synthesis images for the faint (M_B ~ -12.1) dwarf irregular galaxy GR8. We find that the velocity field of the galaxy shows a clear systematic large scale pattern, with a maximum amplitude ~10 km/s.
Jayaram N. Chengalur, Ayesha Begum
openaire +4 more sources