Results 81 to 90 of about 11,803 (197)

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

Ultradeep Imaging of Nearby Dwarf Irregular Galaxies: Young Objects in the Far Outer Disk

The Astronomical Journal
Ultradeep 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, Hong-Xin Zhang, Bruce G. Elmegreen, Ella R. Castelloe, Hannah Michaye Ledford, Ishara Nisley, Ryuga Hatano   +6 more
doaj   +1 more source

The Local Group Census: planetary nebulae in Sextans B

, 2002
Five planetary nebulae (PNe) have been discovered in the nearby dwarf irregular galaxy. Emission line images were obtained using the Wide Field Camera of the 2.5m Isaac Newton Telescope (INT) at La Palma (Spain).
A. A. Zijlstra, Ciardullo, Courteau, D. J. Lennon, D. L. Pollacco, Danziger, Dudziak, Hunter, Hunter, J. R. Walsh, Jacoby, Jacoby, Jacoby, L. Magrini, Lilly, M. Perinotto, Madau, Magrini, Magrini, Mendez, Minniti, Moles, N. A. Walton, Oke, R. Greimel, R. L. M. Corradi, Roye, Sakai, Seaton, Strobel, Tosi, Walsh, Zijlstra, Zijlstra   +33 more
core   +1 more source

Virgo Early-Type Dwarfs in ALFALFA

, 2007
Early-type dwarf galaxies dominate cluster populations, but their formation and evolutionary histories are poorly understood. The ALFALFA (Arecibo Legacy Fast ALFA) survey has completed observations of the Virgo Cluster in the declination range of 6 - 16
Binggeli, Rebecca A. Koopmann
core   +1 more source

A Tale of Three Dwarfs: Cluster-based Star Formation Histories of Blue Compact Dwarf Galaxies

The Astrophysical Journal
We present a new study of the cluster populations in the blue compact dwarf galaxies (BCD) ESO185-IG13, ESO338-IG04, and Haro11, based on new and archival high-resolution images taken by the Hubble Space Telescope, and the first to probe the populations ...
Rupali Chandar, Miranda Caputo, Angus Mok, Sean Linden, Bradley C. Whitmore, Paul Goudfrooij, David O. Cook, Daniela Calzetti, Debra M. Elmegreen, Janice C. Lee, Leonardo Úbeda, Richard White   +11 more
doaj   +1 more source

Oxygen Abundance Throughout the Dwarf Starburst Galaxy IC 10

The Astronomical Journal
Measurements of oxygen abundance throughout galaxies provide insight to the formation histories and ongoing processes. Here we present a study of the gas-phase oxygen abundance in the H ii regions and diffuse gas of the nearby starburst dwarf galaxy, IC ...
Maren Cosens, Shelley A. Wright, Karin Sandstrom, Lee Armus, Norman Murray, Jordan N. Runco, Sanchit Sabhlok, James Wiley   +7 more
doaj   +1 more source

WLM: Dynamics of an isolated dwarf irregular galaxy under ram pressure in the Local Group

Astronomy & Astrophysics
The Wolf–Lundmark–Melotte (WLM) galaxy is an archetypal dwarf irregular galaxy that has not experienced interactions with major Local Group galaxies within the past 8 Gyr.
Kolhe Neel, Hammer Francois, Yang Yanbin, Namumba Brenda, Chemin Laurent, Amram Philippe, Ianjamasimanana Roger, Carignan Claude   +7 more
doaj   +1 more source

The K luminosity-metallicity relation for dwarf galaxies and the tidal dwarf galaxies in the tails of HCG 31

, 2006
We determine a K-band luminosity-metallicity (K-Z) relation for dwarf irregular galaxies, over a large range of magnitudes, -20.5 < M_K < -13.5, using a combination of K photometry from either the 2-micron all sky survey (2MASS) or the recent study of ...
Athanassoula E., Barnes J., Chantal Balkowski, Claudia L. Mendes de Oliveira, Duc P.-A., Edmunds M. G., Eduardo S. Cypriano, Henri Plana, Hidalgo-Gamez A. M., Laerte Sodré, Jr., Masegosa J., Philippe Amram, Sonia Temporin, Vigroux L.   +13 more
core   +2 more sources

Far-infrared Emission Lines as Metallicity Diagnostic

The Astrophysical Journal
The chemical abundance of the interstellar medium is a key tracer of galaxy evolution. Optical and ultraviolet emission lines are widely used to derive gas-phase metallicities, but suffer from uncertainties due to possible temperature fluctuations and ...
Elizabeth Fletcher, Tommy Wiklind, Skarleth Motiño Flores, Rafael T. Eufrasio   +3 more
doaj   +1 more source

Reignited star formation in dwarf galaxies quenched during reionization

, 2018
Irregular dwarf galaxies of the Local Group have very varied properties and star formation histories. Some of them formed the majority of their stars very late compared to the others. Extreme examples are Leo A and Aquarius which reached the peak of star
Ledinauskas, Eimantas, Zubovas, Kastytis
core   +1 more source