Results 101 to 110 of about 12,147 (249)

Thick gas discs in faint dwarf galaxies

, 2010
We determine the intrinsic axial ratio distribution of the 'gas' disks of extremely faint M_B > -14.5 dwarf irregular galaxies. We start with the measured (beam corrected) distribution of apparent axial ratios in the HI 21cm images of dwarf irregular ...
Ayesha Begum, Begum, Begum, Begum, Begum, Begum, Begum, Begum, Begum, Binggeli, Binney, Binney, Dutta, Fall, Galametz, Haynes, Heidmann, Hubble, Igor D. Karachentsev, Jayaram N. Chengalur, Kaufmann, Lambas, Lucy, Noerdlinger, Roychowdhury, Ryden, Sambit Roychowdhury, Sandage, Shu, Staveley-Smith, Verheijen, Walter   +31 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 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

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

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

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

The JWST Resolved Stellar Populations Early Release Science Program. VIII. The Spatially Resolved Star Formation History of WLM

The Astrophysical Journal
Radial stellar population gradients within dwarf galaxies provide a promising avenue for disentangling the drivers of galaxy evolution, including environment. Within the Local Volume, radial stellar age gradient slopes correlate with interaction history,
Roger E. Cohen, Kristen B. W. McQuinn, Alessandro Savino, Max J. B. Newman, Daniel R. Weisz, Andrew E. Dolphin, Martha L. Boyer, Matteo Correnti, Marla C. Geha, Mario Gennaro, Karoline M. Gilbert, Nitya Kallivayalil, Jack T. Warfield, Benjamin F. Williams, Alyson M. Brooks, Andrew A. Cole, Evan D. Skillman, Christopher T. Garling, Jason S. Kalirai, Jay Anderson   +19 more
doaj   +1 more source

Star formation in dwarf irregular galaxies NGC 6822

The Astronomical Journal, 1995
Our proposed method to study the star formation histories in nearby irregulars is here applied to NGC 6822. To this purpose we have obtained accurate CCD photometry of three regions in the galaxy, reaching V$\simeq$23.5 with an accuracy of $ _{BVR}\leq$0.1 mag.
Paola Focardi, Gianni Marconi, Laura Greggio, Monica Tosi   +3 more
openaire   +3 more sources