Results 51 to 60 of about 445,447 (209)

Stellar Abundances in Dwarf Irregular Galaxies

, 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 ...
Venn, K.A., Tolstoy, E., Kaufer, A., Kudritzki, R.P.   +3 more
openaire   +3 more sources

H i Clouds in LITTLE THINGS Dwarf Irregular Galaxies [PDF]

The Astronomical Journal, 2019
Abstract We identify 814 discrete H i clouds in 40 dwarf irregular galaxies from the LITTLE THINGS survey using an automated cloud-finding algorithm. The cloud masses range from ∼103 to 107 M ⊙, have a surface density averaged over all of the clouds of ∼9.65 M ⊙ pc−2, and constitute 2%
Deidre A. Hunter, Bruce G. Elmegreen, Clara L. Berger   +2 more
openaire   +2 more sources

Holmberg IX: A Unique, Infant but Inactive Galaxy as Revealed via a Multiwavelength Approach

The Astrophysical Journal Letters
In this Letter, we report a novel discovery of unique characteristics for the tidal dwarf galaxy (candidate) Holmberg IX via a multiwavelength investigation.
Ye-Wei Mao, Luis C. Ho, Alexei V. Moiseev, Oleg V. Egorov, Andrej M. Sobolev   +4 more
doaj   +1 more source

DDO 43: A Prototypical Dwarf Irregular Galaxy? [PDF]

The Astronomical Journal, 2005
We present sensitive and high resolution 21 cm observations of the dwarf irregular (dIm) galaxy DDO 43, in conjunction with optical broad and narrow band images in U, B, V, and Halpha. The observations are used to examine the relationship between its HI morphology and kinematics to past and present star formation.
Simpson, Caroline E., Hunter, Deidre A., Nordgren, Tyler E.   +2 more
openaire   +2 more sources

Star Forming Dwarf Galaxies

, 2011
Star forming dwarf galaxies (SFDGs) have a high gas content and low metallicities, reminiscent of the basic entities in hierarchical galaxy formation scenarios.
Bergvall, Nils,, Nils Bergvall
core   +1 more source

A JWST/MIRI and NIRCam Analysis of the Young Stellar Object Population in the Spitzer I Region of NGC 6822

The Astrophysical Journal
We present an imaging survey of the Spitzer I star-forming region in NGC 6822 conducted with the NIRCam and MIRI instruments on board JWST. Located at a distance of 490 kpc, NGC 6822 is the nearest non-interacting low-metallicity (∼0.2 Z _⊙ ) dwarf ...
Laura Lenkić, Conor Nally, Olivia C. Jones, Martha L. Boyer, Patrick J. Kavanagh, Nolan Habel, Omnarayani Nayak, Alec S. Hirschauer, Margaret Meixner, B. A. Sargent, Tea Temim   +10 more
doaj   +1 more source

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

The Westerbork HI survey of spiral and irregular galaxies - I. HI imaging of late-type dwarf galaxies

, 2002
Neutral hydrogen observations with the Westerbork Synthesis Radio Telescope are presented for a sample of 73 late-type dwarf galaxies. These observations are part of the WHISP project (Westerbork Hi Survey of Spiral and Irregular Galaxies).
J. M. van der Hulst, Van Albada, TS, van der Hulst, JM, Swaters, R A, Swaters, RA, R. A. Swaters, R. Sancisi, Sancisi, R, Van Albada, T S, van der Hulst, J M ; id_orcid, T. S. van Albada   +10 more
core   +1 more source

The Karl G. Jansky Very Large Array Local Group L-Band Survey (LGLBS)

The Astrophysical Journal Supplement Series
We present the Local Group L -Band Survey, a Karl G. Jansky Very Large Array (VLA) survey producing the highest-quality 21 cm and 1–2 GHz radio continuum images to date, for the six VLA-accessible, star-forming, Local Group galaxies. Leveraging the VLA’s
Eric W. Koch, Adam K. Leroy, Erik W. Rosolowsky, Laura Chomiuk, Julianne J. Dalcanton, Nickolas M. Pingel, Sumit K. Sarbadhicary, Snežana Stanimirović, Fabian Walter, Haylee N. Archer, Alberto D. Bolatto, Michael P. Busch, Hongxing Chen, Ryan Chown, Harrisen Corbould, Serena A. Cronin, Jeremy Darling, Thomas Do, Jennifer Donovan Meyer, Cosima Eibensteiner, Deidre Hunter, Rémy Indebetouw, Preshanth Jagannathan, Amanda A. Kepley, Chang-Goo Kim, Shin-Jeong Kim, Timea O. Kovacs, Joshua Marvil, Eric J. Murphy, Claire E. Murray, Jürgen Ott, D.J. Pisano, Mary Putman, Daniel R. Rybarczyk, Julia Roman-Duval, Karin Sandstrom, Eva Schinnerer, Evan D. Skillman, Adam Smercina, Ioana Stelea, Jay Strader, Jiayi Sun, Devisree Tallapaneni, Elizabeth Tarantino, Vicente Villanueva, Daniel R. Weisz, Thomas G. Williams, Tony Wong   +47 more
doaj   +1 more source

Stars at Low Metallicity in Dwarf Galaxies

, 2008
Dwarf galaxies offer an opportunity to understand the properties of low metallicity star formation both today and at the earliest times at the, epoch of the formation of the first stars.
Cole, Andrew, Battaglia, Giuseppina, Tolstoy, Eline   +2 more
core   +1 more source