Results 11 to 20 of about 737 (162)

Identification and properties of intense star-forming galaxies at redshifts z > 10 [PDF]

, 2023
Surveys with the James Webb Space Telescope (JWST) have discovered candidate galaxies in the first 400 Myr of cosmic time. Preliminary indications have suggested these candidate galaxies may be more massive and abundant than previously thought.
Maiolino R., Egami E., Maseda M. V., Rix H. -W., Lutzgendorf N., Endsley R., Hausen R., Williams C. C., Arribas S., Looser T. J., Charlot S., Witstok J., Saxena A., de Graaff A., Willmer C. N. A., Rieke M., Bunker A., Chevallard J., Curti M., Kumari N., Sandles L., Hainline K., Carniani S., D'Eugenio F., Bonaventura N., Alberts S., Ji Z., Baum S., Boyett K., Hviding R. E., Curtis-Lake E., Florian M., Wallace I. E. B., Tacchella S., Ubler H., Nelson E., Lyu J., Rawle T., Smit R., Eisenstein D. J., Bhatawdekar R., Sun F., Whitler L., Dressler A., Helton J. M., Rieke G., Willott C., Stark D. P., Jakobsen P., Cameron A. J., Suess K. A., Topping M., Johnson B. D., Robertson B. E., Chen Z., Shivaei I.   +55 more
core   +12 more sources

NOEMA redshift measurements of bright Herschel galaxies [PDF]

, 2020
Using the IRAM NOrthern Extended Millimeter Array (NOEMA), we conducted a program to measure redshifts for 13 bright galaxies detected in the Herschel Astrophysical Large Area Survey (H-ATLAS) with S500 _m _ 80 mJy.
Herrera, C., P. van der Werf, Herrera, C.N., L. Marchetti, Harris, A.I., van der Werf, P., Dannerbauer, H., Hughes, D., Baker, A.J., Neri, R., Perez-Fournon, I., Riechers, D.A., Berta, S., Beelen, A., Gavazzi, R., Herrera, C. N., Messias, H., A. Cooray, A. Beelen, D. Hughes, S. Serjeant, M. Negrello, A. I. Harris, M. Lehnert, Young, A.J., Serjeant, S., Baker, A. J., Eales, S., S. Jin, G. Lagache, Buat, V., P. Cox, R. Ivison, H. Messias, Negrello, M., Ivison, R., D. A. Riechers, C. N. Herrera, Cooray, A., Dye, S., S. Berta, C. Yang, Sarjeant, S., Jin, S., S. Urquhart, Omont, A., C. Vlahakis, Bakx, T., S. Eales, S. Dye, A. J. Young, Riechers, D. A., A. Omont, V. Buat, Yang, C., L. Dunne, Lehnert, M., I. Perez-Fournon, Young, A., A. J. Baker, Cox, P., R. Gavazzi, Harris, A. I., Marchetti, L., A. Weiß, Harris, A.L., M. Krips, Lagache, Guilaine, Urquhart, S., Weiss, A., Krips, M., H. Dannerbauer, Lagache, G., Riechers, D., Dunne, L., R. Neri, Werf, P.P. van der, Vlahakis, C., Harris, A., T. Bakx, Baker, A., Young, A. J.   +81 more
core   +2 more sources

Jellyfish galaxies with the IllustrisTNG simulations – citizen-science results towards large distances, low-mass hosts, and high redshifts

Monthly Notices of the Royal Astronomical Society, 2023
ABSTRACT We present the ‘Cosmological Jellyfish’ project – a citizen-science classification program to identify jellyfish (JF) galaxies within the IllustrisTNG cosmological simulations. JF are satellite galaxies that exhibit long trailing gas features – ‘tails’ – extending from their stellar body.
Elad Zinger, Gandhali D Joshi, Annalisa Pillepich, Eric Rohr, Dylan Nelson   +4 more
openaire   +3 more sources

A search for the most massive galaxies: double trouble? [PDF]

, 2005
We describe the results of a search for galaxies with large ({approx}> 350 kms{sup -1}) velocity dispersions. The largest systems we have found appear to be the extremes of the early-type galaxy population: compared to other galaxies with similar ...
York, D. G., Bernardi, Mariangela, Miller, C. J., Sheth, R., Subbarao, M., Schlegel, D., Brinkmann, J., Schneider, D. P., York, D., Schneider, D., Sheth, R. K., Miller, C., Bernardi, M., Nichol, Bob, Frieman, J., Nichol, R. C.   +15 more
core   +1 more source

Confirmation and refutation of very luminous galaxies in the early universe [PDF]

, 2023
During the first 500 million years of cosmic history, the first stars and galaxies formed, seeding the Universe with heavy elements and eventually reionizing the intergalactic medium. Observations with JWST have uncovered a surprisingly high abundance of
Kartaltepe, Jeyhan S., Bagley, Micaela B., Fernández, Vital, Zavala, Jorge A., Casey, Caitlin M., Haro, Pablo Arrabal, Finkelstein, Steven L., Larson, Rebecca L., Hutchison, Taylor A., Dunlop, James S., Weiner, Benjamin J., Jung, Intae, Ferguson, Henry C., Amorín, Ricardo O., Cullen, Fergus, Cohen, Seth H., Carnall, Adam, Dickinson, Mark, Fujimoto, Seiji, Buat, Véronique, Carnall, Adam C., Koekemoer, Anton M., Pirzkal, Norbert, McLeod, Derek J., Kocevski, Dale D., Burgarella, Denis, McLure, Ross J., Trump, Jonathan R., Donnan, Callum T., Wilkins, Stephen M., Giavalisco, Mauro, Huertas-Company, Marc, Lucas, Ray A., Chworowsky, Katherine, Seillé, Lise-Marie, Papovich, Casey, Krips, Melanie, Arrabal Haro, Pablo, Pérez-González, Pablo G.   +38 more
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Distance Causes Departure: Characteristics of Galaxies Vulnerable to Photometric Redshift Measurements

Journal of Physics: Conference Series, 2022
Abstract In this article, we developed the method for calculating photometric redshift through a simple linear regression model. By studying the training set DR17 in Sloan Digital Sky Survey (SDSS), using the spectroscopic redshift data do the fitting job, we got linear coefficients and apply it to the target set and study the model.
openaire   +1 more source

A multi-wavelength study of powerful high redshift radio galaxies [PDF]

, 2021
Philosophiae Doctor - PhDWe present a new sample of distant powerful radio galaxies, in order to study their host-galaxy properties and provide targets for future observations of Hi absorption with new radio telescopes.
Marubini, Takalani
core   +3 more sources

Feature importance for machine learning redshifts applied to SDSS galaxies [PDF]

, 2015
Accepted —-. Received —-; in original form —-. We present an analysis of importance feature selection applied to photometric redshift estimation using the machine learning architecture Random Decision Forests (RDF) with the ensemble learning routine ...
Markus Michael Rau, Roman Zitlau, Rau, M., Stella Seitz, Jochen Weller, Ben Hoyle, Hoyle, B., Weller, J., Zitlau, R., Seitz, S.   +9 more
core   +1 more source

Can Cosmological Simulations Reproduce the Spectroscopically Confirmed Galaxies Seen at $z\geq 10$? [PDF]

, 2023
Recent photometric detections of extreme $(z>10)$ redshift galaxies from the JWST have been shown to be in strong tension with existing simulation models for galaxy formation, and in the most acute case, in tension with $\Lambda CDM$ itself.
M. Tremmel, Trebitsch, M., B. W. Keller, Munshi, F., Tremmel, M., Keller, B. W., F. Munshi, M. Trebitsch   +7 more
core   +2 more sources

Directly observed relations in complete galaxy samples and the predictions of redshift-distance power laws [PDF]

Proceedings of the National Academy of Sciences, 1986
Directly observed relations in complete galaxy samples (apparent magnitude or diameter vs. redshift) are compared with the predictions of redshift-distance power laws. The predictions are obtained by an objective, nonparametric, statistically uniform, and fully reproducible procedure.
openaire   +2 more sources