Results 11 to 20 of about 722,598 (307)

The extended structure of the dwarf irregular galaxy Sagittarius [PDF]

Astronomy & Astrophysics, 2014
We present a detailed study of the stellar and HI structure of the dwarf irregular galaxy Sagittarius. We use new deep and wide field photometry to trace the surface brightness profile of the galaxy out to ~5.0' (corresponding to ~1600 pc) and down to ...
Battaglia, G., Beccari, G., Bellazzini, M., Fraternali, F., Galleti, S., Oosterloo, T. A., Perina, S., Sollima, A., Testa, V.   +8 more
core   +11 more sources

The Magnetic Field of the Irregular Galaxy NGC 4214 [PDF]

The Astrophysical Journal, 2011
We examine the magnetic field in NGC 4214, a nearby irregular galaxy, using multi-wavelength radio continuum polarization data from the Very Large Array.
Allsopp, Amanda A. Kepley, Beck, Beck, Burn, Chyży, Chyży, Condon, Dalcanton, de Vaucouleurs, Dogiel, Drozdovsky, Ellen G. Zweibel, Eric M. Wilcots, Everett, Everett, Fanelli, Greisen, Hanasz, Haynes, Haynes, Hopp, Hunt, Hunter, Hunter, Hunter, Hunter, Hunter, Kelsey E. Johnson, Kepley, Kepley, Klein, Klein, Kobulnicky, Kulsrud, Lisenfeld, MacKenty, Maiz-Apellaniz, Mao, Martin, Maíz-Apellániz, Maíz-Apellániz, McMahon, Otmianowska-Mazur, Ott, Pacholczyk, Sault, Schlegel, Schmitt, Schwartz, Simmons, Spitzer, Steidel, Timothy Robishaw, Tremonti, Wilcots, Úbeda, Úbeda   +57 more
core   +6 more sources

The Dwarf Irregular Galaxy UGC 7636 Exposed: Stripping At Work In The Virgo Cluster [PDF]

, 1999
We present the results of optical spectroscopy of a newly discovered H II region residing in the H I gas cloud located between the dwarf irregular galaxy UGC 7636 and the giant elliptical galaxy NGC 4472 in the Virgo Cluster.
Binggeli B., Edge A. C., Henning P. A., Henry Lee, Le Fevre O., Marshall L. McCall, Michael G. Richer, Pagel B. E. J., Schindler S.   +8 more
core   +2 more sources

The History of Galaxies and Galaxy Number Counts [PDF]

, 1997
(Abridged) A simple quantitative model is presented for the history of galaxies to explain galaxy number counts, redshift distributions and some other related observations. We first infer that irregular galaxies and the disks of spiral galaxies are young, probably formed at $z\approx 0.5-2$ from a simultaneous consideration of colours and gas content ...
Abraham R. G., Arimoto N., Arimoto N., Babul A., Broadhurst T. J., Cole S., Colless M., Colless M., Couch W. J., Efstathiou G., Ellis R. S., Glazebrook K., Glazebrook K., Glazebrook K., Guiderdoni B., Jones L. R., K. Shimasaku, Kauffmann G., M. Fukugita, Madau P., Maddox S. J., Metcalfe N., Metcalfe N., Mobasher B., Persic M., Phillipps S., Sandage A., Smith L. F., Storrie-Lombardi L. J., van der Marel R.   +29 more
arxiv   +5 more sources

THE CHEMISTRY OF IRREGULAR GALAXIES [PDF]

arXiv, 1995
I review the current data on abundances in irregular galaxies, with special emphasis on recent results on C/O and Si/O from observations with the Hubble Space Telescope. The abundance data for He, C, N, and O in irregular galaxies is discussed in the context of models for the evolution of dwarf galaxies.
arxiv   +3 more sources

The Star Clusters in the Starburst Irregular Galaxy NGC 1569 [PDF]

, 2000
We examine star clusters in the irregular, starburst galaxy NGC 1569 from HST images. In addition to the two known super star clusters, we identify 45 other clusters that are compact but resolved. Integrated UVI colors of the clusters span a large range,
Bica E., Bouchet P., Deidre A. Hunter, Girardi L., Goodwin S. P., Hunter D. A., Israel F. P., Israel F. P., J. S. Gallagher, Olofsson K., Prada F., Robert W. O’Connell, Stil J. M., Tammy A. Smecker-Hane, Taylor C. L., Tomita A., Vallenari A.   +16 more
core   +4 more sources

Starbursts in Ring and Irregular Galaxies

Publications of the Astronomical Society of Australia, 1991
AbstractThis paper presents the current status of a Ph.D. project undertaken to search for extended-scale bursts of star formation (> 1 kpc) in irregular and collisionally produced ring galaxies, principally in the southern half of the sky. Results of recent 8.4 GHz radio continuum observations and UBVRI CCD imaging of some of the program galaxies ...
V. J. McIntyre, W. J. Zealey
openalex   +3 more sources

Stellar Structure of Irregular Galaxies. I. Face-on Galaxies [PDF]

Astron.Rep. 49 (2005) 501-509, 2006
Stellar photometry of nearby irregular galaxies of the Local Group is used to identify and study the young and old stellar populations of these galaxies. An analysis of the spatial distributions of stars of different ages in face-on galaxies shows that the young stellar populations in irregular galaxies are concentrated toward the center, and form ...
arxiv   +3 more sources

Magnetic Fields in Irregular Galaxies [PDF]

Highlights of Astronomy, 2002
AbstractRadio data of large irregular galaxies reveal some extended synchrotron emission with a substantial degree of polarization. In the case of NGC 4449 strong galaxy-scale regular magnetic fields were found, in spite of the lack of ordered rotation required for the conventional dynamo action.
K. T. Chyży
openalex   +3 more sources

The Sagittarius dwarf irregular galaxy: metallicity and stellar populations [PDF]

, 2002
We present deep $BVI$ observations of the dwarf irregular galaxy UKS1927-177 in Sagittarius. Statistically cleaned $V$, $(B-I)$ CMDs clearly display the key evolutionary features in this galaxy.
Bertelli, Burstein, Caldwell, Calzetti, Cappellari, Cesarsky, Da Costa, E. V. Held, Gerola, Held, I. Saviane, Karachentsev, L. Rizzi, Landolt, Lee, Lee, Lee, Lo, Longmore, Madore, Mateo, Minniti, Mould, Pritchet, Sakai, Salaris, Saviane, Saviane, Schlegel, Seaton, Skillman, Skillman, Stetson, Stetson, Strobel, Tolstoy, van den Bergh, van den Bergh, van Dyk, Y. Momany, Young, Zijlstra   +41 more
core   +4 more sources