Zobrazeno 71 - 80
of 10 763
pro vyhledávání: '"Ptak A"'
Autor:
Masini, A., Hickox, R. C., Carroll, C. M., Aird, J., Alexander, D. M., Assef, R. J., Bower, R., Brodwin, M., Brown, M. J. I., Chatterjee, S., Chen, C. -T. J., Dey, A., DiPompeo, M. A., Duncan, K. J., Eisenhardt, P. R. M., Forman, W. R., Gonzalez, A. H., Goulding, A. D., Hainline, K. N., Jannuzi, B. T., Jones, C., Kochanek, C. S., Kraft, R., Lee, K. -S., Miller, E. D., Mullaney, J., Myers, A. D., Ptak, A., Stanford, A., Stern, D., Vikhlinin, A., Wake, D. A., Murray, S. S.
We present a new, ambitious survey performed with the Chandra X-ray Observatory of the 9.3 deg$^2$ Bo\"otes field of the NOAO Deep Wide-Field Survey. The wide field probes a statistically representative volume of the Universe at high redshift. The Ch
Externí odkaz:
http://arxiv.org/abs/2009.03317
Autor:
Babczynski, Tomasz1 tomasz.babczynski@pwr.edu.pl, Ptak, Roman1 roman.ptak@pwr.edu.pl
Publikováno v:
International Journal of Electronics & Telecommunications. 2024, Vol. 70 Issue 1, p95-102. 8p.
Autor:
Ptak, Anita1 (AUTHOR) anita.ptak@pwr.edu.pl, Łuksza, Zuzanna1 (AUTHOR)
Publikováno v:
Polymers (20734360). Dec2023, Vol. 15 Issue 24, p4696. 14p.
Autor:
Kovlakas, Konstantinos, Zezas, Andreas, Andrews, Jeff J., Basu-Zych, Antara, Fragos, Tassos, Hornschemeier, Ann, Lehmer, Bret, Ptak, Andrew
Using the Chandra Source Catalog 2.0 and a newly compiled catalogue of galaxies in the local Universe, we deliver a census of ultraluminous X-ray source (ULX) populations in nearby galaxies. We find 629 ULX candidates in 309 galaxies with distance sm
Externí odkaz:
http://arxiv.org/abs/2008.10572
Autor:
Marchesi, Stefano, Gilli, Roberto, Lanzuisi, Giorgio, Dauser, Thomas, Ettori, Stefano, Vito, Fabio, Cappelluti, Nico, Comastri, Andrea, Mushotzky, Richard, Ptak, Andrew, Norman, Colin
Publikováno v:
A&A 642, A184 (2020)
We present a series of new, publicly available mock catalogs of X-ray selected active galactic nuclei (AGNs), non-active galaxies, and clusters of galaxies. They are based on up-to-date observational results on the demographic of extragalactic X-ray
Externí odkaz:
http://arxiv.org/abs/2008.09133
Autor:
Basu-Zych, Antara R., Hornschemeier, Ann E., Haberl, Frank, Vulic, Neven, Wilms, Jorn, Zezas, Andreas, Kovlakas, Konstantinos, Ptak, Andrew, Dauser, Thomas
eROSITA, launched on 13 July 2019, will be completing the first all-sky survey in the soft and medium X-ray band in nearly three decades. This 4-year survey, finishing in late 2023, will present a rich legacy for the entire astrophysics community and
Externí odkaz:
http://arxiv.org/abs/2008.01870
Autor:
Lehmer, Bret D., Ferrell, Andrew P., Doore, Keith, Eufrasio, Rafael T., Monson, Erik B., Alexander, David M., Basu-Zych, Antara, Brandt, William N., Sivakoff, Greg, Tzanavaris, Panayiotis, Yukita, Mihoko, Fragos, Tassos, Ptak, Andrew
We investigate X-ray binary (XRB) luminosity function (XLF) scaling relations for Chandra detected populations of low-mass XRBs (LMXBs) within the footprints of 24 early-type galaxies. Our sample includes Chandra and HST observed galaxies at D < 25 M
Externí odkaz:
http://arxiv.org/abs/2004.13045
Autor:
Elvis, Martin, Arenberg, Jon, Ballantyne, David, Bautz, Mark, Beichman, Charles, Booth, Jeffrey, Buckley, James, Burns, Jack O., Camp, Jordan, Conti, Alberto, Cooray, Asantha, Danchi, William, Delabrouille, Jacques, De Zotti, Gianfranco, Flauger, Raphael, Glenn, Jason, Grindlay, Jonathan, Hanany, Shaul, Hartmann, Dieter, Helou, George, Herranz, Diego, Hubmayr, Johannes, Johnson, Bradley R., Jones, William, Kasdin, N. Jeremy, Kouvoliotou, Chryssa, Kunze, Kerstin E., Lawrence, Charles, Lazio, Joseph, Lipscy, Sarah, Lillie, Charles F., Maccarone, Tom, Madsen, Kristin C., Mushotzky, Richard, Olinto, Angela, Plavchan, Peter, Pogosian, Levon, Ptak, Andrew, Ray, Paul, Rocha, Graca M., Scowen, Paul, Seager, Sara, Tinto, Massimo, Tomsick, John, Tucker, Gregory., Ulmer, Mel, Wang, Yun, Wollack, Edward J.
Astrophysics spans an enormous range of questions on scales from individual planets to the entire cosmos. To address the richness of 21st century astrophysics requires a corresponding richness of telescopes spanning all bands and all messengers. Much
Externí odkaz:
http://arxiv.org/abs/2002.12739
Truncated Toeplitz operators in a model space are C--symmetric with respect to a natural conjugation in that space. We show that this and another conjugation associated to an orthogonal decomposition possess unique properties and we study their relat
Externí odkaz:
http://arxiv.org/abs/2001.00400
A new class of operators, larger than $C$-symmetric operators and different than normal one, named $C$--normal operators is introduced. Basic properties are given. Characterizations of this operators in finite dimensional spaces using a relation with
Externí odkaz:
http://arxiv.org/abs/1912.13369