Results 1 to 10 of about 12,436 (240)

Giant Halos in Dwarf Irregular Galaxies vs. Dwarf Elliptical Galaxies [PDF]

Proceedings of the International Astronomical Union, 2005
We present a discovery of a giant stellar halo in NGC 6822, a dwarf irregular galaxy in the Local Group. This halo is mostly made of old red giants, showing striking features: 1) it is several times larger than the main body of the galaxy seen in the ...
Hwang, Narae, Lee, Myung Gyoon
core   +2 more sources

Searching for TeV Dark Matter in Irregular Dwarf Galaxies with HAWC Observatory [PDF]

The Astrophysical Journal, 2023
We present the results of dark matter (DM) searches in a sample of 31 dwarf irregular (dIrr) galaxies within the field of view of the HAWC Observatory.
R. Alfaro, C. Alvarez, J. C. Arteaga-Velázquez, D. Avila Rojas, H. A. Ayala Solares, R. Babu, E. Belmont-Moreno, K. S. Caballero-Mora, T. Capistrán, A. Carramiñana, S. Casanova, O. Chaparro-Amaro, U. Cotti, J. Cotzomi, E. De la Fuente, R. Diaz Hernandez, B. L. Dingus, M. A. DuVernois, M. Durocher, J. C. Díaz-Vélez, C. Espinoza, K. L. Fan, N. Fraija, J. A. García-González, F. Garfias, M. M. González, J. P. Harding, S. Hernández-Cadena, D. Huang, F. Hueyotl-Zahuantitla, A. Iriarte, V. Joshi, S. Kaufmann, D. Kieda, J. Lee, H. León Vargas, J. T. Linnemann, A. L. Longinotti, G. Luis-Raya, K. Malone, O. Martinez, J. Martínez-Castro, J. A. Matthews, E. Moreno, M. Mostafá, A. Nayerhoda, L. Nellen, N. Omodei, Y. Pérez Araujo, E. G. Pérez-Pérez, C. D. Rho, D. Rosa-González, H. Salazar, D. Salazar-Gallegos, A. Sandoval, J. Serna-Franco, Y. Son, R. W. Springer, O. Tibolla, K. Tollefson, I. Torres, R. Torres-Escobedo, R. Turner, F. Ureña-Mena, L. Villaseñor, X. Wang, E. Willox, H. Zhou, C. de León, The HAWC Collaboration, V. Gammaldi, E. Karukes, P. Salucci   +72 more
doaj   +2 more sources

Lopsidedness in dwarf irregular galaxies [PDF]

Monthly Notices of the Royal Astronomical Society, 2000
We quantify the amplitude of the lopsidedness, the azimuthal angular asymmetry index, and the concentration of star forming regions, as represented by the distribution of the H$\alpha$ emission, in a sample of 78 late-type irregular galaxies.
Abraham, Alexander, Almoznino, Ana B. Heller, Brosch, Carignan, Conselice, Dohm-Palmer, Dohm-Palmer, Dohm-Palmer, Draper, Edelson, Elchanan Almoznino, Elmegreen, Gerola, Heller, Heller, Hunter, Jog, John J. Salzer, Kaspi, Kornreich, Larson, Leitherer, Levine, Liese van Zee, Mihos, Moffat, Netzer, Noah Brosch, Rudnick, Salzer, Schechter, Skillman, van Zee, van Zee, van Zee, van Zee, van Zee, Walker, Young, Zaritsky   +41 more
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Stellar Abundances in Dwarf Irregular Galaxies [PDF]

, 2003
Dwarf irregular galaxies appear to have undergone very slow chemical evolution since they have low nebular abundances, but have had ongoing star formation over the past 15 Gyr. They are too distant for red giant abundance analyses to examine the details of their chemical evolution, however the isolated, bright blue supergiants do allow us to determine ...
Kim A. Venn, Eline Tolstoy, A. Kaufer, Rolf P. Kudritzki   +3 more
openalex   +4 more sources

Empirical dependencies for irregular dwarf galaxies [PDF]

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.
Komiljon Tillaboev, Ikram Tadjibaev, Nilufar Otojanova   +2 more
openalex   +3 more sources

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.
G. Marconi, M. Tosi, L. Greggio, P. Focardi   +3 more
openalex   +3 more sources

Oxygen abundances in dwarf irregular galaxies and the metallicity - luminosity relationship [PDF]

, 2001
The low-luminosity dwarf irregular galaxies are considered. The oxygen abundances in HII regions of dwarf irregular galaxies were recalculated from published spectra through the recently suggested P - method. It has been found that the metallicity of low-
Pilyugin, L. S.
core   +4 more sources

Star Formation in Sculptor Group Dwarf Irregular Galaxies and the Nature of "Transition" Galaxies [PDF]

, 2002
We present new H-alpha narrow band imaging of the HII regions in eight Sculptor Group dwarf irregular (dI) galaxies. Comparing the Sculptor Group dIs to the Local Group dIs, we find that the Sculptor Group dIs have, on average, lower values of SFR when ...
Babul A., Binggeli B., Bomans D. J., Brosch N., Bryan W. Miller, Efstathiou G., Evan D. Skillman, Heisler C. A., Quinn T., Scalo J. M., Stéphanie Côté   +10 more
core   +3 more sources

The Interstellar Medium in Dwarf Irregular Galaxies [PDF]

Annual Review of Astronomy and Astrophysics
Dwarf irregular (dIrr) galaxies are among the most common type of galaxy in the Universe. They typically have gas-rich, low-surface-brightness, metal-poor, and relatively thick disks. Here, we summarize the current state of our knowledge of the interstellar medium (ISM), including atomic, molecular, and ionized gas, along with their dust properties and
Deidre A. Hunter, Bruce G. Elmegreen, S. C. Madden   +2 more
openalex   +4 more sources

Modified Newtonian Dynamics (MOND): Observational Phenomenology and Relativistic Extensions [PDF]

Living Reviews in Relativity, 2012
Benoit Famaey, Stacy McGaugh
exaly   +2 more sources