Results 71 to 80 of about 334,147 (281)

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 optical images, and 2) it is elongated in the direction almost perpendicular to the HI disk of NGC 6822.
Narae Hwang, Myung Gyoon Lee
openaire   +4 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

Constraining Star-Formation Driven Outflows in Local Dwarf Galaxies with Herschel†

Physical Sciences Forum, 2023
Galactic feedback (i.e., outflows) plays a fundamental role in regulating galaxy formation and evolution. We investigate the physical properties of galactic outflows in a sample of 29 local low-metallicity dwarf galaxies drawn from the Dwarf Galaxy ...
Michael Romano
doaj   +1 more source

R-process enrichment from a single event in an ancient dwarf galaxy [PDF]

Nature, 2015
Elements heavier than zinc are synthesized through the rapid (r) and slow (s) neutron-capture processes. The main site of production of the r-process elements (such as europium) has been debated for nearly 60 years.
A. Ji, A. Frebel, A. Chiti, J. Simon
semanticscholar   +1 more source

On the dynamics of the Sagittarius dwarf galaxy [PDF]

Monthly Notices of the Royal Astronomical Society, 1995
We use numerical simulations to test the feasibility of the suggestion by Ibata et al. (1994) that the excess population of stars which they discovered in the Sagittarius region may be the disrupted remains of a dwarf spheroidal galaxy. We find that a Fornax-like model for the pre-disruption system can indeed reproduce the data.
Hector Velazquez, Simon D. M. White
openaire   +2 more sources

The Herschel Dwarf Galaxy Survey - I. Properties of the low-metallicity ISM from PACS spectroscopy [PDF]

, 2015
Context. The far-infrared (FIR) lines are important tracers of the cooling and physical conditions of the interstellar medium (ISM) and are rapidly becoming workhorse diagnostics for galaxies throughout the universe.
D. Cormier, S. Madden, V. Lebouteiller, N. Abel, S. Hony, F. Galliano, A. Rémy-Ruyer, F. Bigiel, M. Baes, A. Boselli, M. Chevance, A. Cooray, I. D. Looze, I. D. Looze, V. Doublier, M. Galametz, T. Hughes, O. Karczewski, Min-Young Lee, N. Lu, L. Spinoglio   +20 more
semanticscholar   +1 more source

Quantifying Bursty Star Formation in Dwarf Galaxies

The Open Journal of Astrophysics
Dwarf galaxy star formation histories are theoretically expected to be bursty, potentially leaving distinct imprints on their chemical evolution. We propose that episodic starbursts with quiescent periods longer than ~100 Myr should lead to discontinuous
Yuan-Sen Ting, Alexander Ji
doaj   +1 more source

JWST Imaging of the Closest Globular Clusters—VI. The Lowest‐Mass Objects in M 4 and the Galactic Bulge

Astronomische Nachrichten, EarlyView.
ABSTRACT We present James Webb Space Telescope observations of M 4—the closest globular cluster—that probe the lower Main Sequence down to the hydrogen‐burning limit. The unveiled stellar sequence reaches much fainter luminosities than previously possible, revealing a few extremely red objects that are consistent with brown dwarfs as cool as Teff∼1000K$
L. R. Bedin, R. Gerasimov, A. Calamida, M. Libralato, M. Scalco, D. Nardiello, M. Griggio, D. Apai, J. Anderson, A. Bellini, A. Burgasser   +10 more
wiley   +1 more source

The unexpected diversity of dwarf galaxy rotation curves [PDF]

, 2015
We examine the circular velocity profiles of galaxies in A cold dark matter (CDM) cosmological hydrodynamical simulations from the EAGLE and LOCAL GROUPS projects and compare them with a compilation of observed rotation curves of galaxies spanning a wide
K. Oman, J. Navarro, Azadeh Fattahi, C. Frenk, Till Sawala, S. White, R. Bower, R. Crain, M. Furlong, M. Schaller, J. Schaye, T. Theuns   +11 more
semanticscholar   +1 more source

The cores of dwarf galaxy haloes [PDF]

Monthly Notices of the Royal Astronomical Society, 1996
We use N-body simulations to examine the effects of mass outflows on the density profiles of cold dark matter (CDM) halos surrounding dwarf galaxies. In particular, we investigate the consequences of supernova-driven winds that expel a large fraction of the baryonic component from a dwarf galaxy disk after a vigorous episode of star formation.
Julio F. Navarro, Julio F. Navarro, Vincent R. Eke, Carlos S. Frenk   +3 more
openaire   +3 more sources