Zobrazeno 1 - 10
of 1 454
pro vyhledávání: '"A Zezas"'
Context. A major challenge in astrophysics is classifying galaxies by their activity. Current methods often require multiple diagnostics to capture the full range of galactic activity. Furthermore, overlapping excitation sources with similar observat
Externí odkaz:
http://arxiv.org/abs/2411.08983
Autor:
Adamcová, B., Svoboda, J., Kyritsis, E., Kouroumpatzakis, K., Zezas, A., Boorman, P. G., Borkar, A., Bílek, M., Clavel, M., Petrucci, P. -O.
Publikováno v:
A&A 691, A27 (2024)
Compact star-forming galaxies were dominant galaxy types in the early Universe. Blueberry galaxies (BBs) represent their local analogues being very compact and having intensive star formation. Motivated by high X-ray emission recently found in other
Externí odkaz:
http://arxiv.org/abs/2408.13572
Autor:
Moon, Hannah, Wik, Daniel R., Antoniou, V., Eracleous, M., Hornschemeier, Ann E., Lazzarini, Margaret, Lehmer, Bret D., Vulic, Neven, Williams, Benjamin F., Maccarone, T. J., Pottschmidt, K., Ptak, Andrew, Yukita, Mihoko, Zezas, Andreas
Publikováno v:
ApJ 970, 167, 2024
Using hard (E>10 keV) X-ray observations with NuSTAR, we are able to differentiate between accretion states, and thus compact object types, of neutron stars and black holes in X-ray binaries (XRBs) in M31, our nearest Milky Way-type neighbor. Using t
Externí odkaz:
http://arxiv.org/abs/2408.02828
Autor:
Kouroumpatzakis, K., Svoboda, J., Zezas, A., Borkar, A., Kyritsis, E., Boorman, P. G., Daoutis, C., Adamcová, B., Grossová, R.
Publikováno v:
A&A 688, A159 (2024)
Dwarf highly star-forming galaxies (SFGs) dominated the early Universe and are considered the main driver of its reionization. However, direct observations of these distant galaxies are mainly confined to rest-frame ultraviolet and visible light, lim
Externí odkaz:
http://arxiv.org/abs/2405.03391
Autor:
Kyritsis, E., Zezas, A., Haberl, F., Weber, P., Basu-Zych, A., Vulic, N., Maitra, C., Hämmerich, S., Wilms, J., Sasaki, M., Hornschemeier, A., Ptak, A., Merloni, A., Comparat, J.
We present a study of X-ray normal galaxies using data from the first all-sky scan of the eROSITA X-ray survey. eRASS1 provides the first unbiased X-ray census of normal galaxies allowing us to study the X-ray emission from XRBs and the hot ISM in th
Externí odkaz:
http://arxiv.org/abs/2402.12367
Autor:
Lehmer, Bret D., Garofali, Kristen, Binder, Breanna A., Fornasini, Francesca, Vulic, Neven, Zezas, Andreas, Hornschemeier, Ann, Lazzarini, Margaret, Moon, Hannah, Venters, Toni, Wik, Daniel, Yukita, Mihoko, Bachetti, Matteo, García, Javier A., Grefenstette, Brian, Madsen, Kristin, Mori, Kaya, Stern, Daniel
We construct simulated galaxy data sets based on the High Energy X-ray Probe (HEX-P) mission concept to demonstrate the significant advances in galaxy science that will be yielded by the HEX-P observatory. The combination of high spatial resolution i
Externí odkaz:
http://arxiv.org/abs/2311.04735
Publikováno v:
A&A 679, A76 (2023)
(abridged) The overwhelming majority of diagnostic tools for galactic activity are focused on active galaxies. Passive or dormant galaxies are often excluded from these diagnostics which usually employ emission line features. In this work, we use inf
Externí odkaz:
http://arxiv.org/abs/2310.02888
Autor:
West, Lacey, Garofali, Kristen, Lehmer, Bret D., Prestwich, Andrea, Eufrasio, Rafael, Luangtip, Wasutep, Roberts, Timothy P., Zezas, Andreas
Luminous infrared galaxies (LIRGs), the most extreme star-forming galaxies in the nearby (D$<$30 Mpc) Universe, show a notable X-ray emission deficiency (up to a factor of $\sim$10) compared with predictions from scaling relations of galaxy-wide high
Externí odkaz:
http://arxiv.org/abs/2305.19491
X-ray appearance of normal galaxies is mainly determined by X-ray binaries powered by accretion onto a neutron star or a stellar mass black hole. Their populations scale with the star-formation rate and stellar mass of the host galaxy and their X-ray
Externí odkaz:
http://arxiv.org/abs/2304.14080
We use the Random Forest (RF) algorithm to develop a tool for automated activity classification of galaxies into 5 different classes: Star-forming (SF), AGN, LINER, Composite, and Passive. We train the algorithm on a combination of mid-IR (WISE) and
Externí odkaz:
http://arxiv.org/abs/2303.11691