Results 71 to 80 of about 11,751 (112)

H i Clouds in LITTLE THINGS Dwarf Irregular Galaxies [PDF]

The Astronomical Journal, 2019
Abstract We identify 814 discrete H i clouds in 40 dwarf irregular galaxies from the LITTLE THINGS survey using an automated cloud-finding algorithm. The cloud masses range from ∼103 to 107 M ⊙, have a surface density averaged over all of the clouds of ∼9.65 M ⊙ pc−2, and constitute 2%
Deidre A. Hunter, Bruce G. Elmegreen, Clara L. Berger   +2 more
openaire   +2 more sources

The HI column density distribution function in faint dwarf galaxies

, 2012
We present the HI column density distribution function,\fnh, as measured from dwarf galaxies observed as part of the Faint Irregular Galaxy GMRT (FIGGS) survey.
Begum, Ayesha, Chengalur, Jayaram N., Patra, Narendra Nath   +2 more
core   +1 more source

Rotationally Supported Virgo Cluster Dwarf Elliptical Galaxies: Stripped Dwarf Irregular Galaxies?

The Astronomical Journal, 2004
New observations of 16 dwarf elliptical galaxies in the Virgo Cluster indicate that at least seven dEs have significant velocity gradients along their optical major axis, with typical rotation amplitudes of 20-30 km/s. Of the remaining nine galaxies in this sample, 6 have velocity gradients less than 20 km/s kpc^{-1} while the other 3 observations had ...
van Zee, L., Skillman, E. D., Haynes, M. P.   +2 more
openaire   +2 more sources

What is the (Dark) Matter with Dwarf Galaxies?

, 2010
We present cosmological hydrodynamical simulations of the formation of dwarf galaxies in a representative sample of haloes extracted from the Millennium-II Simulation.
Aarseth, Adrian Jenkins, Baldry, Belokurov, Benson, Blanton, Bower, Boylan-Kolchin, Bruzual, Bush, Cantalupo, Carrasco, Cecilia Scannapieco, Chapman, Christlein, Cole, Cole, Cole, Conroy, Croton, de Blok, Dejonghe, Dekel, Dekel, Diemand, Dolphin, Efstathiou, Ferrara, Geha, Gnedin, Governato, Guo, Guo, Haardt, Hoeft, Hunter, Jenkins, Katz, Kauffmann, Kennicutt, Kennicutt, Khochfar, Klypin, Koch, Komatsu, Koposov, Koyama, Larson, Li, Mandelbaum, Martin, Mashchenko, McConnachie, McQuinn, Monelli, Moore, Moster, Navarro, Pelupessy, Power, Qi Guo, Quirk, Revaz, Ricotti, Salpeter, Sawala, Scannapieco, Scannapieco, Scannapieco, Scannapieco, Simon, Simon White, Skillman, Somerville, Springel, Springel, Springel, Springel, Staveley-Smith, Stinson, Stinson, Sutherland, Sánchez-Janssen, Thielemann, Till Sawala, Tollerud, Trentham, Valcke, Vale, Viel, Woosley, Yang, Zavala   +92 more
core   +1 more source

OLD GLOBULAR CLUSTERS IN MAGELLANIC-TYPE DWARF IRREGULAR GALAXIES

The Astronomical Journal, 2008
We present a study of the old globular clusters (GC) using archival F606W and F814W HST/ACS images of 19 Magellanic-type dwarf Irregular (dIrr) galaxies found in nearby (2 - 8 Mpc) associations of only dwarf galaxies. All dIrrs have absolute magnitudes fainter than or equal to the SMC (Mv = -16.2 mag).
Georgiev, Iskren Y., Goudfrooij, Paul, Puzia, Thomas, Hilker, Michael   +3 more
openaire   +2 more sources

The evolution of the photometric properties of Local Group dwarf spheroidal galaxies

, 2008
We investigate the present-day photometric properties of the dwarf spheroidal galaxies in the Local Group. From the analysis of their integrated colours, we consider a possible link between dwarf spheroidals and giant ellipticals.
Annibali, Aparicio, Arimoto, Bonifacio, Bonifacio, Bower, Bradamante, Bruzual, Bullock, Calura, Calura, Calura, Calura, Calzetti, Calzetti, Calzetti, Carignan, Carignan, Carrera, Cescutti, Côté, Davies, Dekel, Dolphin, F. Calura, F. Matteucci, Fenner, Ferguson, François, Freedman, G. A. Lanfranchi, Gallagher, Gallagher, Geisler, Geisler, Grebel, Greggio, Hernandez, Hurley-Keller, Ikuta, Irwin, Karick, Kauffmann, Kawata, Koch, Koch, Kroupa, Kuhn, Kunth, Lanfranchi, Lanfranchi, Lanfranchi, Lanfranchi, Lanfranchi, Larson, Lin, Majewski, Mateo, Mateo, Matteucci, Matteucci, Matteucci, Matteucci, Matteucci, Mayer, Menci, Monaco, Moore, Mori, Muñoz, Nomoto, Papaderos, Phillipps, Recchi, Renzini, Ricotti, Rizzi, Sadakane, Salpeter, Sandage, Saro, Schmidt, Schulte-Ladbeck, Shapley, Shetrone, Shetrone, Skillman, Somerville, Tamura, Thielemann, Thomsen, Tinsley, Tolstoy, Tolstoy, van den Bergh, Van den Hoeck, Venn, Woosley, Zaritsky   +98 more
core   +1 more source

Oxygen and Nitrogen in Isolated Dwarf Irregular Galaxies

The Astrophysical Journal, 2006
We present long slit optical spectroscopy of 67 HII regions in 21 dwarf irregular galaxies to investigate the enrichment of oxygen, nitrogen, neon, sulfur, and argon in low mass galaxies. Oxygen abundances are obtained via direct detection of the temperature sensitive emission lines for 25 HII regions; for the remainder of the sample, oxygen abundances
van Zee, L., Haynes, M. P.
openaire   +2 more sources

Empirical dependencies for irregular dwarf galaxies

Astronomical and Astrophysical Transactions
In this work, we search for empirical relationships for irregular dwarf galaxies using a collection of observational data published in the NASA and HyperLeda databases. Using a complex statistical analysis, we calculated correlation coefficients between various physical parameters of irregular dwarf galaxies.
Tillaboev, K., Tadjibaev, I., Otojanova, N.   +2 more
openaire   +2 more sources

Properties of the Dwarf Irregular Galaxy DDO 169

The Astronomical Journal, 2006
This paper investigates the H i, optical, and dark matter properties of the dwarf irregular galaxy DDO 169. The galaxy shows signs of being tidally disrupted. Evidence of this can easily be seen in the galaxy's velocity field. We also show that DDO 169, which was thought to have a companion galaxy, does not.
Mansie G. Iyer, Caroline E. Simpson
openaire   +1 more source

Dwarf Irregular Galaxies and the Intergalactic Medium

, 1998
To be published in the proceedings of the XVI Cracow Summer School of Cosmology, 9 pages, no figures %in the University of Lodz ...
openaire   +2 more sources