Results 1 to 10 of about 36,448 (174)

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

Supernova Remnants in the Irregular Galaxy NGC 4449

The Astrophysical Journal, 2023
The nearby irregular galaxy NGC 4449 has a star formation rate of ∼0.4 M _☉ yr ^−1 and should host of order 70 supernova remnants (SNRs) younger than 20,000 yr, a typical age for SNRs expanding into an interstellar medium (ISM) with a density of 1 cm ^−3
P. Frank Winkler, Knox S. Long, William P. Blair   +2 more
doaj   +3 more sources

The oxygen abundance deficiency in irregular galaxies [PDF]

New Astronomy Reviews, 2000
The observed oxygen abundances in a number of irregular galaxies have been compared with predictions of the closed-box model of chemical and photometric evolution of galaxies. Oxygen is found to be deficient with respect to the predicted abundances. This
Ferrini, F., Pilyugin, L. S.
core   +4 more sources

Catching Tidal Dwarf Galaxies at a Later Evolutionary Stage with ALFALFA

The Astronomical Journal, 2023
We present deep optical imaging and photometry of four objects classified as “Almost-Dark” galaxies in the Arecibo Legacy Fast Arecibo L-band Feed Array (ALFALFA) survey because of their gas-rich nature and extremely faint or missing optical emission in ...
Laurin M. Gray, Katherine L. Rhode, Lukas Leisman, Pavel E. Mancera Piña, John M. Cannon, John J. Salzer, Lexi Gault, Jackson Fuson, Gyula I. G. Józsa, Elizabeth A. K. Adams, Nicholas J. Smith, Martha P. Haynes, Steven Janowiecki, Hannah J. Pagel   +13 more
doaj   +1 more source

Magnetic Fields in Irregular Galaxies [PDF]

Proceedings of the International Astronomical Union, 2008
Magnetic fields are an important component of the interstellar medium, especially in low-mass galaxies like irregulars where the magnetic pressure may be significant. However, few irregular galaxies have observed magnetic field structures. Using the VLA, the GBT, and the ATCA, we have observed several irregular galaxies in the radio continuum to ...
Kepley, Amanda A., Muehle, Stefanie, Wilcots, Eric M., Everett, John, Zweibel, Ellen, Robishaw, Timothy, Heiles, Carl   +6 more
openaire   +4 more sources

Optical observations of the nearby galaxy NGC 2366 through narrowband Hα and [SII] filters. Supernova remnants status [PDF]

Serbian Astronomical Journal, 2019
We present detection of 64 H II regions, three superbubbles and two optical supernova remnant (SNR) candidates in the nearby irregular galaxy NGC 2366. The SNR candidates were detected by applying [S II]/Hα ratio criterion to observations made with the 2-
Vučetić M.M., Onić D., Petrov N., Ćiprijanović A., Pavlović M.Z.   +4 more
doaj   +1 more source

Near-IR TRGB Distance Modulus of Dwarf Irregular Galaxy IC 1613 [PDF]

Journal of Astronomy and Space Sciences, 2009
The JHKs magnitudes of the red giant branch tip (TRGB) and the distance moduli of the nearby dwarf irregular galaxy IC 1613 have been determined from the nearinfrared luminosity functions (LFs) of the resolved stars in the galaxy.
M. Y. Jung, S.-H. Chun, C.-R. Chang, M. Han, D. Lim, W. Han, Y.-J. Sohn   +6 more
doaj   +1 more source

Near-IR TRGB Distance to Nearby Dwarf Irregular Galaxy NGC 6822 [PDF]

Journal of Astronomy and Space Sciences, 2008
We report the distance modulus of nearby dwarf irregular galaxy NGC 6822 estimated from the so-called Tip of Red-giant Branch (TRGB) method. To detect the apparent magnitudes of the TRGB we use the color-magnitude diagrams (CMDs) and luminosity functions
Y.-J. Sohn, A. Kang, W, Han, J.-H. Park, H.-I. Kim, J.-W. Kim, I.-G. Shin, S.-H. Chun   +7 more
doaj   +1 more source

Outlier Detection in the DESI Bright Galaxy Survey

The Astrophysical Journal Letters, 2023
We present an unsupervised search for outliers in the Bright Galaxy Survey (BGS) data set from the DESI Early Data Release. This analysis utilizes an autoencoder to compress galaxy spectra into a compact, redshift-invariant latent space, and a ...
Yan Liang, Peter Melchior, ChangHoon Hahn, Jeff Shen, Andy Goulding, Charlotte Ward   +5 more
doaj   +1 more source

Searches for Extremely Metal-poor Galaxies Using Arecibo Legacy Fast ALFA–Selected Dwarf Galaxies

The Astrophysical Journal, 2023
We present a study of nearby dwarf galaxies selected from the Arecibo Legacy Fast ALFA (ALFALFA) blind H i survey. A primary goal of the project was to utilize a nonstandard selection method with the hope of detecting previously unrecognized extremely ...
John H. Miller Jr., John J. Salzer, Steven Janowiecki, Martha P. Haynes, Alec S. Hirschauer   +4 more
doaj   +1 more source