Results 91 to 100 of about 722,598 (307)

The faint outer regions of the Pegasus dwarf irregular galaxy: A much larger and undisturbed galaxy [PDF]

, 2009
We investigate the spatial extent and structure of the Pegasus dwarf irregular galaxy (PegDIG) using deep, wide-field, multicolour CCD photometry from the Sloan Digital Sky Survey (SDSS) and new deep H I observations.
A. Kniazev, N. Brosch, G. L. Hoffman, E. Grebel, D. Zucker, S. A. P. Saao, South Africa Salt Foundation, South Africa Steward Observatory, Israel Lafayette College, Usa University of Heidelberg, G. I. F. Astronomy, UK Macquarie University, Australia Anglo-Australian Observatory, A. S. Ras, Russia.   +14 more
semanticscholar   +1 more source

A Young Star Cluster in the Leo a Galaxy

Open Astronomy, 2015
We report a serendipitous discovery of a star cluster in the dwarf irregular galaxy Leo A. Young age (~28 Myr) and low mass (~510 M⊙) estimates are based on the isochrone fit assuming a metallicity derived for HII regions (Z = 0.0007).
Stonkutė R., Narbutis D., Bridžius A., Leščinskaitė A., Vansevičius V.   +4 more
doaj   +1 more source

On the massive star content of the nearby dwarf irregular Wolf-Rayet galaxy IC 4662 [PDF]

, 2009
Aims. We investigate the massive stellar content of the nearby dwarf irregular Wolf-Rayet galaxy IC 4662, and consider its global star forming properties in the context of other metal-poor galaxies, the SMC, IC 10 and NGC 1569. Methods.
Borissova, Buckalew, Crowther, Crowther, Crowther, De Robertis, Fagotto, Fruchter, Garnett, Gregory, Grocholski, Hadfield, Hammer, Helmboldt, Heydari-Malayeri, Hidalgo-Gámez, Hilditch, Hillenbrand, Hummer, Hunter, Hunter, J. L. Bibby, Johnson, Karachentsev, Kennicutt, Kennicutt, Kennicutt, Kennicutt, Kennicutt, Kennicutt, Kobulnicky, Kroupa, Leitherer, Lonsdale Persson, Maoz, Massey, McQuinn, Meynet, Meynet, Modjaz, P. A. Crowther, Parker, Rauw, Relaño, Russell, Schaerer, Schaerer, Schlegel, Seaton, Sirianni, Tody, Vacca   +51 more
core   +3 more sources

Nitrogen in irregular galaxies

The Astrophysical Journal, 1990
A study of nitrogen in giant H II regions located within low-abundance irregular galaxies is presented. Both observations and theoretical models are used to examine variations in the abundance of nitrogen relative to oxygen in these galaxies. Analysis of these and previously published observations suggests that the use of low spectral resolution is the
openaire   +2 more sources

Corvus A: A Low-mass, Isolated Galaxy at 3.5 Mpc

The Astrophysical Journal Letters
We report the discovery of Corvus A, a low-mass, gas-rich galaxy at a distance of approximately 3.5 Mpc, identified in DR10 of the Dark Energy Camera Legacy Imaging Survey during the initial phase of our ongoing SEmi-Automated Machine LEarning Search for
Michael G. Jones, David J. Sand, Burçin Mutlu-Pakdil, Catherine E. Fielder, Denija Crnojević, Paul Bennet, Kristine Spekkens, Richard Donnerstein, Amandine Doliva-Dolinsky, Ananthan Karunakaran, Jay Strader, Dennis Zaritsky   +11 more
doaj   +1 more source

A Diverse Population of z ∼ 2 ULIRGs Revealed by JWST Imaging

The Astrophysical Journal, 2023
Four ultraluminous infrared galaxies (ULIRGs) observed with JWST/NIRcam in the Cosmos Evolution Early Release Science program offer an unbiased preview of the z ∼ 2 ULIRG population.
J.-S. Huang, Zi-Jian Li, Cheng Cheng, Meicun Hou, Haojing Yan, S. P. Willner, Y.-S. Dai, X. Z. Zheng, J. Pan, D. Rigopoulou, T. Wang, Zhiyuan Li, Piaoran Liang, A. Esamdin, G. G. Fazio   +14 more
doaj   +1 more source

On the radial abundance gradients in discs of irregular galaxies [PDF]

Monthly Notices of the Royal Astronomical Society, 2015
10 pages, 4 figures, accepted to ...
Eva K. Grebel, Igor Zinchenko, Igor Zinchenko, L. S. Pilyugin, L. S. Pilyugin, L. S. Pilyugin   +5 more
openaire   +5 more sources

50% body weight loading reduces stature increases and lumbar disc expansion from 4 h hyper‐buoyancy floatation versus 15 min sitting upright

Experimental Physiology, EarlyView.
Abstract Microgravity is associated with stature increases, back pain and post‐flight intervertebral disc (IVD) herniation. This study aims to determine whether 30 s seated 50% body weight (BW) axial loading is comparable to 15 min sitting upright in 1 g upon changes in stature, anterior lumbar IVD height (via ultrasound), passive vertebral stiffness ...
David Marcos‐Lorenzo, Christina Lysandrou, Laura Sudres, Alfonso Gil‐Martinez, Jaap Swanenburg, James Edward Clark, David Andrew Green   +6 more
wiley   +1 more source

The JWST Hubble Sequence: The Rest-frame Optical Evolution of Galaxy Structure at 1.5 < z < 6.5

The Astrophysical Journal, 2023
We present results on the morphological and structural evolution of a total of 3956 galaxies observed with JWST at 1.5 < z < 6.5 in the JWST CEERS observations that overlap with the CANDELS EGS field.
Leonardo Ferreira, Christopher J. Conselice, Elizaveta Sazonova, Fabricio Ferrari, Joseph Caruana, Clár-Bríd Tohill, Geferson Lucatelli, Nathan Adams, Dimitrios Irodotou, Madeline A. Marshall, Will J. Roper, Christopher C. Lovell, Aprajita Verma, Duncan Austin, James Trussler, Stephen M. Wilkins   +15 more
doaj   +1 more source

A slow bar in the dwarf irregular galaxy NGC 3741 [PDF]

, 2013
Using the Tremaine-Weinberg method, we measure the speed of the HI bar seen in the disk of NGC 3741. NGC 3741 is an extremely gas rich galaxy with an {H\,{\sc i}} disk which extends to about 8.3 times its Holmberg radius.
Banerjee, Arunima, Begum, Ayesha, Chengalur, Jayaram N., Patra, Narendra Nath   +3 more
core   +1 more source