Results 51 to 60 of about 11,803 (197)
The Westerbork HI Survey of Spiral and Irregular Galaxies I. HI Imaging of Late-type Dwarf Galaxies
, 2002 Neutral hydrogen observations with the Westerbork Synthesis Radio Telescope are presented for a sample of 73 late-type dwarf galaxies. These observations are part of the WHISP project (Westerbork HI Survey of Spiral and Irregular Galaxies).
Sancisi, R. +3 more
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Stellar Abundances in Dwarf Irregular Galaxies
, 2003 Dwarf irregular galaxies appear to have undergone very slow chemical evolution since they have low nebular abundances, but have had ongoing star formation over the past 15 Gyr. They are too distant for red giant abundance analyses to examine the details of their chemical evolution, however the isolated, bright blue supergiants do allow us to determine ...
Venn, K.A. +3 more
openaire +3 more sources
Variable star monitoring in local group dwarf irregular galaxies [PDF]
International Astronomical Union Colloquium, 2004 AbstractDwarf galaxies in the local group provide a unique astrophysical laboratory. Despite their proximity some of these systems still lack reliable distance determinations as well as studies of their stellar content and star formation history. We present first results of our survey of variable stars in a sample of six local group dwarf irregular ...
Snigula, Jan +3 more
openaire +2 more sources
The Astrophysical Journal Supplement SeriesWe present a sample of low H i mass ( M _H I
Cheng Cheng +6 more
doaj +1 more source
Stellar Populations in the Local Group of Galaxies
, 2005 The characteristics and properties of the stellar populations and evolutionary histories of Local Group galaxies are summarized and compared to predictions of cosmological models.
Grebel, Eva K.
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Identifying Old Tidal Dwarf Irregulars [PDF]
, 2000 We examine the observational consequences of the two possible origins for irregular galaxies: formation from collapse of a primordial cloud of gas early in the age of the Universe, and formation from tidal tails in an interaction that could have occured ...
Bottinelli L. +16 more
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Chemical evolution of dwarf irregular and blue compact galaxies [PDF]
Astronomy & Astrophysics, 2011 Dwarf irregular and blue compact galaxies are very interesting objects since they are relatively simple and unevolved. We present new models for the chemical evolution of these galaxies by assuming different regimes of star formation (bursting and continuous) and different kinds of galactic winds (normal and metal-enhanced).
Yin, J. +2 more
openaire +3 more sources
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
doaj +1 more source
The Astrophysical Journal, 2023 We conducted an optical monitoring survey of the Sagittarius dwarf irregular galaxy (SagDIG) during the period of 2016 June–2017 October, using the 2.5 m Isaac Newton Telescopeat La Palama.
Tahere Parto +9 more
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Workshop on the Magellanic Clouds and other Dwarf Galaxies [PDF]
, 1998 The Workshop 'The Magellanic Clouds and Other Dwarf Galaxies' was held at the Physikzentrum Bad Honnef in January 1998. The proceedings comprise 79 contributions.
Braun, J M, Richtler, T
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