Results 131 to 140 of about 722,598 (307)

Adaptive optics imaging and optical spectroscopy of a multiple merger in a luminous infrared galaxy

, 2007
(abridged) We present near-infrared (NIR) adaptive optics imaging obtained with VLT/NACO and optical spectroscopy from the Southern African Large Telescope (SALT) of a luminous infrared galaxy (LIRG) IRAS 19115-2124. These data are combined with archival
A. Adamo, A. Efstathiou, A. Kniazev, A. Zijlstra, Alberdi, Anders, Arribas, Barnes, Barnes, Bell, Bergvall, Bertin, Bohlin, Borne, Bournaud, Brosch, Buckley, Burgh, Bushouse, Chakrabarti, Chapman, Choi, Cole, Colina, Colina, Conselice, Coppin, Cui, Cullen, D. A. H. Buckley, D. Farrah, Dasyra, Dasyra, Davoodi, Denicoló, Di Matteo, E. B. Burgh, E. Romero-Colmenero, Efstathiou, Efstathiou, Elbaz, Farrah, Farrah, Farrah, Farrah, G. Östlin, Genzel, Giveon, Heckman, Hinz, Houck, Hughes, James, Jarrett, K. Nordsieck, Kawakatu, Kennicutt, Kim, Kobulnicky, L. Crause, Levenson, Lonsdale, Lonsdale, Lípari, Lípari, M. Still, Martin, Mattila, Mattila, Mihos, Mirabel, Monreal-Ibero, Monreal-Ibero, Murphy, Murphy, N. Loaring, Naab, Naab, Naab, O'Donaghue, P. H. Johansson, P. Lira, P. Väisänen, Pahre, Parra, Peng, Phillips, Pérez-Torres, Rhoads, Rieke, Rieke, Robertson, Rupke, S. Mattila, S. Ryder, Sanders, Sanders, Schwartz, Sirianni, Smail, Smith, Sparks, Spoon, Springel, Springel, Strauss, Sturm, Takata, Thronson, Valiante, Veilleux, Veilleux, Veilleux, Veilleux, Veilleux, Verma, Väisänen, Wahde, Wang, Wetzstein, Y. Hashimoto, Zasov   +121 more
core   +2 more sources

Mass‐Loss, Composition and Observational Signatures of Stellar Winds From X‐Ray Bursts

Astronomische Nachrichten, Volume 346, Issue 1, January 2025.
ABSTRACT X‐Ray bursts (XRBs) are powerful thermonuclear events on the surface of accreting neutron stars (NSs), which can synthesize intermediate‐mass elements. Although the high surface gravity prevents an explosive ejection, a small fraction of the envelope may be ejected by radiation‐driven winds.
Yago Herrera, Daniel Muñoz Vela, Gloria Sala, Jordi José, Yuri Cavecchi   +4 more
wiley   +1 more source

RR Lyrae and Short-Period Variable Stars in the Dwarf Irregular Galaxy NGC 6822 [PDF]

, 2003
We report the discovery of a large number of short-period variable stars in the dwarf irregular galaxy NGC 6822, based on deep time-series imaging carried out with the ESO Very Large Telescope.
G. Clementini, E. Held, L. Baldacci, L. Rizzi   +3 more
semanticscholar   +1 more source

Star Formation in the Lopsided Galaxy Arp 291

The Astrophysical Journal
We have investigated the star formation process taking place in the lopsided galaxy Arp 291, based on narrowband images in the H α , [N ii ] λ 6583, and [O iii ] λ 5007 emission lines, obtained using the modern tunable photometer MaNGaL at the Caucasus ...
Irina S. Proshina, Dmitriy V. Oparin
doaj   +1 more source

Expectations of the Size Evolution of Massive Galaxies at 3 ≤ z ≤ 6 from the TNG50 Simulation: The CEERS/JWST View

The Astrophysical Journal, 2023
We present a catalog of about 25,000 images of massive ( M _⋆ ≥ 10 ^9 M _⊙ ) galaxies at redshifts 3 ≤ z ≤ 6 from the TNG50 cosmological simulation, tailored for observations at multiple wavelengths carried out with JWST.
Luca Costantin, Pablo G. Pérez-González, Jesús Vega-Ferrero, Marc Huertas-Company, Laura Bisigello, Fernando Buitrago, Micaela B. Bagley, Nikko J. Cleri, Michael C. Cooper, Steven L. Finkelstein, Benne W. Holwerda, Jeyhan S. Kartaltepe, Anton M. Koekemoer, Dylan Nelson, Casey Papovich, Annalisa Pillepich, Nor Pirzkal, Sandro Tacchella, L. Y. Aaron Yung   +18 more
doaj   +1 more source

Comparative Analysis of Seventeen Mitochondrial Genomes of Mileewinae Leafhoppers, Including the Unique Species Mileewa digitata (Hemiptera: Cicadellidae: Mileewinae) From Xizang, China, and New Insights Into Phylogenetic Relationships Within Mileewini

Ecology and Evolution, Volume 15, Issue 1, January 2025.
In this study, we sequenced and comparatively analyzed 17 mitochondrial genomes from 16 species of Mileewinae, including the distinct mitochondrial genome of the unique species Mileewa digitata. Phylogenetic analyses employing Bayesian Inference (BI) and Maximum Likelihood (ML) methods produced six trees that further challenge the monophyly of the ...
Hongli He, Bin Yan, Xiaofei Yu, Maofa Yang   +3 more
wiley   +1 more source

Strange and Odd Morphology Extragalactic Radio Sources (STROMERSs): A Faint Images of the Radio Sky at Twenty-Centimeters (FIRST) Look at the Strange and Odd Radio Sources

Universe
We report the identification of an extremely rare and peculiar set of irregular radio sources, termed “STROMERSs” (STRange and Odd Morphology Extragalactic Radio Sources).ingThe irregular radio sources with very anomalous morphologies that make them ...
Soumen Kumar Bera, Tapan K. Sasmal, Soumen Mondal, Taotao Fang, Xuelei Chen   +4 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 normalized to either galaxy luminosity or gas mass (although there is considerable overlap between ...
arxiv   +1 more source

Molecular Clouds in Dwarf Irregular Galaxies [PDF]

Highlights of Astronomy, 1989
The study of molecular clouds in dwarf galaxies was, until recently, an arduous task and provided detections in only a handful of sources (see Thronson and Bally 1986; Wiklind et al. 1986; Tacconi and Young 1987; Arnoult et al. 1988). Line strengths observed in CO were small (<100mK) and measurements were confined to one position per source, thus ...
openaire   +2 more sources

Analysis of 42 Years of Cosmic Ray Measurements by the Neutron Monitor at Lomnický štít Observatory

Earth and Space Science, Volume 12, Issue 1, January 2025.
Abstract The correlation and physical interconnection between space weather indices and cosmic ray flux has been well‐established with extensive literature on the topic. Our investigation is centered on the relationships among the solar radio flux, geomagnetic field activity, and cosmic ray flux, as observed by the Neutron Monitor at the Lomnický štít ...
Imre Kisvárdai, Filip Štempel, Lukáš Randuška, Šimon Mackovjak, Ronald Langer, Igor Strhárský, Ján Kubančák   +6 more
wiley   +1 more source