Results 101 to 110 of about 12,211 (252)

Searches for Extremely Metal-poor Galaxies Using Arecibo Legacy Fast ALFA–Selected Dwarf Galaxies

The Astrophysical Journal, 2023
We present a study of nearby dwarf galaxies selected from the Arecibo Legacy Fast ALFA (ALFALFA) blind H i survey. A primary goal of the project was to utilize a nonstandard selection method with the hope of detecting previously unrecognized extremely ...
John H. Miller Jr., John J. Salzer, Steven Janowiecki, Martha P. Haynes, Alec S. Hirschauer   +4 more
doaj   +1 more source

A Pressure Anomaly for HII Regions in Irregular Galaxies [PDF]

, 2000
The pressures of giant HII regions in 6 dwarf Irregular galaxies are a factor of ~10 larger than the average pressures of the corresponding galaxy disks, obtained from the stellar and gaseous column densities.
Becquaert J. F., Bottema R., Boulanger F., Broeils A., Bruce G. Elmegreen, Combes F., de Paolis F., de Paolis F., Deidre A. Hunter, Honma M., Kalberla P. M. W., Knapp G. R., Kuijken K., Lequeux J., Lequeux J., Loinard L., Olling R. P., Pfenniger D., Pfenniger D., Shostak G. S., Skillman E. D., Stavely-Smith L., van der Kruit P. C., van der Kruit P. C., van der Kruit P. C., Wilson T. L.   +25 more
core   +3 more sources

The chemical content of a sample of dwarf irregular galaxies [PDF]

Astronomy & Astrophysics, 2002
We present abundances of neon, nitrogen and oxygen of some nearby dwarf irregular galaxies. The elemental abundances are retrieved from long-slit spectroscopy of H ii regions in the objects. The abundances are found to be sub-solar in all cases. For the dwarf irregular galaxy DDO 190 the abundances reported in this work are the rst ever published.
K. Olofsson, A. M. Hidalgo-Gámez
openaire   +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 IC 10, Leo A and Sextans A

, 2003
In the framework of our narrow-band survey of the Local Group galaxies, we present the results of the search for planetary nebulae (PNe) in the dwarf irregular galaxies IC10, LeoA and SextansA.
A. A. Zijlstra, A. Mampaso, Arnaboldi, Ciardullo, Ciardullo, Cook, D. J. Lennon, D. L. Pollacco, Danziger, de Vaucouleurs, Dohm-Palmer, Dolphin, Dopita, Durrell, Hodge, Hodge, Huchtmeier, Hunter, J. R. Walsh, Jacoby, Jacoby, Killen, L. Magrini, Leisy, M. Perinotto, Magrini, Massey, Massey, Mathis, Minniti, Morgan, Méndez, N. A. Walton, Oke, P. Leisy, R. Greimel, R. L. M. Corradi, Roberts, Sakai, Sakai, Sandage, Shostak, Skillman, Strobel, Tolstoy, Wilson, Young, Zijlstra   +47 more
core   +1 more source

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

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

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

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

Deep Hubble Space Telescope Imaging of IC 1613 II. The Star Formation History

, 2003
We present deep HST WFPC2 imaging of the Local Group dwarf irregular galaxy IC 1613. The photometry is the deepest to date for an isolated dwarf irregular galaxy.
Abhijit Saha, Andrew A. Cole, Andrew E. Dolphin, Antonello E., Babul A., Borissova J., Carraro G., Colless M., Duquennoy A., Efstathiou G., Eline Tolstoy, Evan D. Skillman, Fioc M., Gallagher J. S., Gardiner L. T., Glazebrook K., Hodge P., J. S. Gallagher, Kroupa P., Lake G., Maeder A., Mario Mateo, Matteucci F., Mighell K. J., Nath B. B., Peimbert M., Quinn T., R. C. Dohm‐Palmer, Rees M. J., Skillman E. D., Skillman E. D., White S. D. M.   +31 more
core   +2 more sources