Results 11 to 20 of about 11,803 (197)

Thick gas discs in faint dwarf galaxies

Monthly Notices of the Royal Astronomical Society: Letters, 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   +3 more sources

The Interstellar Medium in Dwarf Irregular Galaxies

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
Hunter, Deidre A., Elmegreen, Bruce G., Madden, Suzanne C.   +2 more
openaire   +5 more sources

Nuclear Activity in the Low-metallicity Dwarf Galaxy SDSS J0944-0038 : A Glimpse into the Primordial Universe

The Astrophysical Journal Letters, 2023
Local low-metallicity dwarf galaxies are relics of the early universe and are thought to hold clues into the origins of supermassive black holes. While recent studies are uncovering a growing population of active galactic nuclei (AGNs) in dwarf galaxies,
Michael Reefe, Shobita Satyapal, Remington O. Sexton, Nathan J. Secrest, William Matzko, Emma Schwartzman, Kristina Nyland, Gabriela Canalizo, Barry Rothberg, Ryan W. Pfeifle, Jenna M. Cann, Archana Aravindan, Camilo Vazquez, Tracy Clarke   +13 more
doaj   +1 more source

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   +2 more sources

The Isaac Newton Telescope Monitoring project: Stellar population in the IC 10 dwarf irregular galaxy [PDF]

Iranian Journal of Astronomy and Astrophysics, 2019
We have conducted an optical monitoring survey of IC 10 dwarf irregular galaxy in the Local Group, using the Isaac Newton Telescope (INT) with the wide-field camera (WFC), to identify the Asymptotic Giant Branch stars (AGBs).
Mahtab Gholami, Mohammad Taghi Mirtorabi
doaj   +1 more source

Merger Induced Globular Cluster Formation and Galaxy Evolution [PDF]

, 2008
Based on the earlier work of Gunn and McCrea we model the formation of globular clusters in merging galaxies. Neutral hydrogen observations of dwarf irregular galaxies as well as more luminous systems are used to provide the key parameters of the model ...
Hartwick, F. D. A.
core   +1 more source

The Stellar Content of 10 Dwarf Irregular Galaxies [PDF]

The Astronomical Journal, 1998
We examine the stellar content of 10 dwarf irregular galaxies of which broad-band CCD photometry was published in Hopp & Schulte-Ladbeck (1995). We also present Halpha images for several of these galaxies. The galaxies in the sample are located outside of the Local Group.
Schulte-Ladbeck, Regina E., Hopp, Ulrich
openaire   +2 more sources

The Interstellar Medium of Dwarf Galaxies

Galaxies, 2022
Dwarf galaxies are by far the most numerous galaxies in the Universe, showing properties that are quite different from those of their larger and more luminous cousins. This review focuses on the physical and chemical properties of the interstellar medium
Christian Henkel, Leslie K. Hunt, Yuri I. Izotov   +2 more
doaj   +1 more source

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   +1 more source

A STAR FORMATION LAW FOR DWARF IRREGULAR GALAXIES [PDF]

The Astrophysical Journal, 2015
The radial profiles of gas, stars, and far ultraviolet radiation in 20 dwarf Irregular galaxies are converted to stability parameters and scale heights for a test of the importance of two-dimensional (2D) instabilities in promoting star formation. A detailed model of this instability involving gaseous and stellar fluids with self-consistent thicknesses
Bruce G. Elmegreen, Deidre A. Hunter
openaire   +2 more sources