Results 11 to 20 of about 228,395 (174)

Decomposition of the central structure of NGC 2273 in the NIR: A case study

Astronomische Nachrichten, Volume 344, Issue 10, December 2023., 2023
Abstract The Seyfert 2 galaxy NGC 2273 is a prime target to explore how active nuclei can be fed. It has a star‐forming innermost nuclear ring with a radius of 0.33kpc from where material may be funneled to the supermassive black hole in its center. In this article, we discuss high‐resolution adaptive optics aided JHKs images of NGC 2273 taken with the
L. Schey, J. Heidt, A. Pramskiy, D. Thompson, G. Agapito, S. Esposito, R. Gredel, D. Miller, E. Pinna, A. Puglisi, F. Rossi, W. Seifert, G. Taylor, A. Quirrenbach   +13 more
wiley   +1 more source

Target Selection and Sample Characterization for the DESI LOW-Z Secondary Target Program

The Astrophysical Journal, 2023
We introduce the DESI LOW- Z Secondary Target Survey, which combines the wide-area capabilities of the Dark Energy Spectroscopic Instrument (DESI) with an efficient, low-redshift target selection method.
Elise Darragh-Ford, John F. Wu, Yao-Yuan Mao, Risa H. Wechsler, Marla Geha, Jaime E. Forero-Romero, ChangHoon Hahn, Nitya Kallivayalil, John Moustakas, Ethan O. Nadler, Marta Nowotka, J. E. G. Peek, Erik J. Tollerud, Benjamin Weiner, J. Aguilar, S. Ahlen, D. Brooks, A. P. Cooper, A. de la Macorra, A. Dey, K. Fanning, A. Font-Ribera, S. Gontcho A Gontcho, K. Honscheid, T. Kisner, Anthony Kremin, M. Landriau, Michael E. Levi, P. Martini, Aaron M. Meisner, R. Miquel, Adam D. Myers, Jundan Nie, N. Palanque-Delabrouille, W. J. Percival, F. Prada, D. Schlegel, M. Schubnell, Gregory Tarlé, M. Vargas-Magaña, Zhimin Zhou, H. Zou   +41 more
doaj   +1 more source

PAWS and POCO: NIR Astrophotonic Instruments for Astronomy

Astronomische Nachrichten, Volume 344, Issue 8-9, October-November 2023., 2023
Abstract For near‐infrared ground and space‐based astronomy, compact photonic devices can replace the large bulk optical components in spectrographs, frequency combs, beam combiners, and sky subtraction filters, thus saving cost, reducing volume, weight, and power requirements.
Kalaga Madhav, Alan Günther, Eloy Hernandez, Stella Vjes̆nica, Daniel Bodenmüller, Andreas Stoll, Christer Sandin, Haydar Altuğ Yıldırım, Martin M. Roth   +8 more
wiley   +1 more source

Evaluating the GeoSnap 13‐μ$$ \mu $$m cutoff HgCdTe detector for mid‐IR ground‐based astronomy

Astronomische Nachrichten, Volume 344, Issue 8-9, October-November 2023., 2023
Abstract New mid‐infrared HgCdTe (MCT) detector arrays developed in collaboration with Teledyne Imaging Sensors (TIS) have paved the way for improved 10‐μ$$ \mu $$m sensors for space‐ and ground‐based observatories. Building on the successful development of longwave HAWAII‐2RGs for space missions such as NEO Surveyor, we characterize the first 13‐μ ...
Jarron M. Leisenring, Dani Atkinson, Rory Bowens, Vincent Douence, William F. Hoffmann, Michael R. Meyer, John Auyeung, James Beletic, Mario S. Cabrera, Alexandra Z. Greenbaum, Philip Hinz, Derek Ives, William J. Forrest, Craig W. McMurtry, Judith L. Pipher, Eric Viges   +15 more
wiley   +1 more source

Simulating high-redshift galaxies [PDF]

, 2011
Recent observations have gathered a considerable sample of high redshift galaxy candidates and determined the evolution of their luminosity function (LF). To interpret these findings, we use cosmological SPH simulations including, in addition to standard
Ahn, Andrea Ferrara, Atek, Berger E., Bianchi, Bolton, Bolton, Bouwens, Bouwens, Bouwens, Bouwens, Bradley, Choudhury, Choudhury, Daigne, Dayal, Dayal, Dayal, di Serego Alighieri, Eyles, Ferrara, Finkelstein, Finlator, Fryer, Giavalisco, Governato, Grindlay, Haardt, Haiman, Heger, Hirschi, Iye, Jimenez, Kashikawa, Kawai, Komissarov, Labbé, Lai, Leitherer, Mac, MacFadyen, Madau, Madau, Malhotra, Mao, McKee, Nagamine, Nagamine, Nagao, Nozawa, Oesch, Okamoto, Ouchi, Pratika Dayal, Richard, Ruben Salvaterra, Salvadori, Salvaterra, Salvaterra, Salvaterra, Salvaterra, Samui, Savaglio, Scannapieco, Schaerer, Schaerer, Schneider, Schneider, Schneider, Schneider, Shapley, Shimasaku, Spergel, Springel, Springel, Stark, Steidel, Stiavelli, Susa, Taniguchi, Tanvir, Todini, Tornatore, Trenti, Valiante, Vazquez, Yan, Yoon   +87 more
core   +2 more sources

Fraction of Clumpy Star-forming Galaxies at 0.5 ≤ z ≤ 3 in UVCANDELS: Dependence on Stellar Mass and Environment

The Astrophysical Journal, 2023
High-resolution imaging of galaxies in rest-frame UV has revealed the existence of giant star-forming clumps prevalent in high-redshift galaxies. Studying these substructures provides important information about their formation and evolution and informs ...
Zahra Sattari, Bahram Mobasher, Nima Chartab, Daniel D. Kelson, Harry I. Teplitz, Marc Rafelski, Norman A. Grogin, Anton M. Koekemoer, Xin Wang, Rogier A. Windhorst, Anahita Alavi, Laura Prichard, Ben Sunnquist, Jonathan P. Gardner, Eric Gawiser, Nimish P. Hathi, Matthew J. Hayes, Zhiyuan Ji, Vihang Mehta, Brant E. Robertson, Claudia Scarlata, L. Y. Aaron Yung, Christopher J. Conselice, Y. Sophia Dai, Yicheng Guo, Ray A. Lucas, Alec Martin, Swara Ravindranath   +27 more
doaj   +1 more source

Detector system challenges of the wide‐field spectroscopic survey telescope (WST)

Astronomische Nachrichten, Volume 344, Issue 8-9, October-November 2023., 2023
Abstract The wide‐field spectroscopic survey telescope (WST) is proposed to become the next large optical/near infrared facility for the European southern observatory (ESO) once the extremely large telescope (ELT) has become operational. While the latter is optimized for unprecedented sensitivity and adaptive‐optics assisted image quality over a small ...
Roland Bacon, Martin M. Roth, Paola Amico, Eloy Hernandez, The WST Consortium   +4 more
wiley   +1 more source

A tool to understand emission mechanisms of blazars through their high‐energy gamma‐ray emission

Astronomische Nachrichten, Volume 344, Issue 6, August 2023., 2023
The blazar SED is characterized by two energy components. Evidence suggests that the low‐energy component is generated by the synchrotron mechanism, but for the high‐energy component, the mechanism is still uncertain. Two main models have been proposed to explain this emission. According to the leptonic model, a correlation between the emission of both
Mabel Osorio, Erick Rangel, José Rodrigo Sacahui, María Magdalena González   +3 more
wiley   +1 more source

Early Results from GLASS-JWST. IX. First Spectroscopic Confirmation of Low-mass Quiescent Galaxies at z > 2 with NIRISS

The Astrophysical Journal Letters, 2023
How passive galaxies form, and the physical mechanisms which prevent star formation over long timescales, are some of the most outstanding questions in understanding galaxy evolution.
Danilo Marchesini, Gabriel Brammer, Takahiro Morishita, Pietro Bergamini, Xin Wang, Marusa Bradac, Guido Roberts-Borsani, Victoria Strait, Tommaso Treu, Adriano Fontana, Tucker Jones, Paola Santini, Benedetta Vulcani, Ana Acebron, Antonello Calabrò, Marco Castellano, Karl Glazebrook, Claudio Grillo, Amata Mercurio, Themiya Nanayakkara, Piero Rosati, Chanita Tubthong, Eros Vanzella   +22 more
doaj   +1 more source

Unraveling the enigmatic soft x‐ray excess: Current understanding and future perspectives

Astronomische Nachrichten, Volume 344, Issue 6, August 2023., 2023
Abstract This article explores various theoretical models proposed to explain the soft x‐ray excess phenomenon, including warm Comptonization, ionized reflection models, and ionized outflowing disc winds. The soft x‐ray excess is better understood thanks to crucial observations made by ROSAT, XMM‐Newton, and eROSITA.
Thomas Boller
wiley   +1 more source