Results 41 to 50 of about 36,487 (213)

SAGAbg. I. A Near-unity Mass-loading Factor in Low-mass Galaxies via Their Low-redshift Evolution in Stellar Mass, Oxygen Abundance, and Star Formation Rate

The Astrophysical Journal
Measuring the relation between star formation and galactic winds is observationally difficult. In this work we make an indirect measurement of the mass-loading factor (the ratio between the mass outflow rate and star formation rate) in low-mass galaxies ...
Erin Kado-Fong, Marla Geha, Yao-Yuan Mao, Mithi A. C. de los Reyes, Risa H. Wechsler, Yasmeen Asali, Nitya Kallivayalil, Ethan O. Nadler, Erik J. Tollerud, Benjamin Weiner   +9 more
doaj   +1 more source

Witnessing a Transformation to Blue-cored Dwarf Early-type Galaxies in Filaments and the Cluster Outskirts: Gas-phase Abundances and Internal Kinematics Perspectives

The Astrophysical Journal, 2023
The presence of transitional dwarf galaxies in filaments and cluster outskirts may be closely related to preprocessing in the filament; however, the underlying mechanism is not yet comprehensively understood.
Jiwon Chung, Joon Hyeop Lee, Hyunjin Jeong, Suk Kim   +3 more
doaj   +1 more source

Stellar Populations of the Sagittarius Dwarf Irregular Galaxy [PDF]

, 1999
We present deep BVRI CCD photometry of the stars in the dwarf irregular galaxy SagDIG. The color-magnitude diagrams of the measured stars in SagDIG show a blue plume which consists mostly of young stellar populations, and a well-defined red giant branch (
Bertelli G., Cardelli J. A., Cesarsky D. A., Cousins A. W. J., Lee M. G., Longmore A. J., Lyo A.-R., Myung Gyoon Lee, Sang Chul Kim, Skillman E. D.   +9 more
core   +4 more sources

Solid Harmonic Wavelet Bispectrum for Image Analysis

Advanced Science, EarlyView.
The Solid Harmonic Wavelet Bispectrum (SHWB), a rotation‐ and translation‐invariant descriptor that captures higher‐order (phase) correlations in signals, is introduced. Combining wavelet scattering, bispectral analysis, and group theory, SHWB achieves interpretable, data‐efficient representations and demonstrates competitive performance across texture,
Alex Brown, Mathilda Avirett‐Mackenzie, Carolin Villforth, Georgios Exarchakis   +3 more
wiley   +1 more source

Fine-grained Morphological Study of Galaxy Pairs: A Human-in-the-loop Self-supervised Classification Framework

The Astronomical Journal
Galaxy pairs, as key probes for studying galaxy formation and evolution, provide a unique window for observing galaxy interactions, including the associated exchange of material and related galaxy formation activities.
Yating Li, Jiang-hui Cai, Hai-feng Yang, Jie Wang, Lihua Hu   +4 more
doaj   +1 more source

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   +1 more source

Stellar Populations of Dwarf Irregular Galaxies [PDF]

Symposium - International Astronomical Union, 1996
We recently completed two-color CCD photometry of resolved stars in 11 dwarf irregular galaxies (Hopp & Schulte-Ladbeck, 1995, A&AS 111, 527), selected because of their relative isolation from massive galaxies in the Kran-Korteweg – Tammann sample (1979, AN 300, 181).
R.E. Schulte-Ladbeck, Ulrich Hopp
openaire   +1 more source

An ATP‐Mediated Antibiotic β‐Peptide Nanofiber That Kills Multidrug‐Resistant Bacteria via a Multistage Mechanism

Advanced Science, EarlyView.
The 3K‐AP system forms infinite supramolecular fibrils that undergo controlled degradation into shorter fragments upon enzymatic hydrolysis. Multitechnique imaging reveals a stepwise bacteriolytic mechanism involving bacterial entrapment, disassembly into lethal constructs, and associated extracellular vesicle release, highlighting the dynamic ...
Sohini Chakraborty, Kamal el Battioui, Dániel Molnár, Bálint Jezsó, Lejla Daruka, Tasvilla Sonallya, Tünde Juhász, Rita Hirmondó, Imola Cs. Szigyártó, Loránd Románszki, Natália Tőkési, Daniel Pinkas, Eszter Házy, Olivér Pavela, Andrea Bodor, Zoltán Varga, István Mándity, Mihály Kovács, Csaba Pál, Kata Horváti, Judit Tóth, Tamás Beke‐Somfai   +21 more
wiley   +1 more source

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

Intrinsic galaxy shapes and alignments I: Measuring and modelling COSMOS intrinsic galaxy ellipticities [PDF]

, 2013
The statistical properties of the ellipticities of galaxy images depend on how galaxies form and evolve, and therefore constrain models of galaxy morphology, which are key to the removal of the intrinsic alignment contamination of cosmological weak ...
Abraham, Allgood, Altay, B. Joachimi, Bailin, Bailin, Bartelmann, Bernstein, Bernstein, Bertin, Bett, Bett, Bett, Bildfell, Binggeli, Binney, Bower, Brainerd, Bridle, Bridle, Bundy, Catelan, Cole, Croft, Davis, E. Semboloni, Erben, Faltenbacher, Fukugita, H. Hoekstra, Hahn, Hahn, Hao, Harker, Heavens, Heymans, Heymans, Hilbert, Hirata, Hoekstra, Hung, Ilbert, J. Hartlap, Jing, Joachimi, Joachimi, Joachimi, Joachimi, Kaiser, Kazantzidis, King, King, Kitching, Knebe, Knebe, Komatsu, Kuhlen, Lambas, Laureijs, Leauthaud, Lee, Mandelbaum, Mandelbaum, Melchior, Mobasher, P. E. Bett, P. Schneider, Parry, Percival, Pereira, Refregier, Rhodes, S. Hilbert, Scarlata, Schneider, Schrabback, Scoville, Spergel, Springel, Springel, T. Schrabback, Takada, van den, van Uitert, Zhang   +84 more
core   +2 more sources