57 citations · 169 across the 20 of their papers we have counts for
21 papers
The star formation history of NGC 2276: Comparison between SED modeling and hydrodynamical simulations
Luka Matijevic, Antonino Marasco, Neven Tomicic +10
Analyzing environmental effects in galaxy groups is pivotal for understanding how galaxies evolve in these moderate-density settings. The degree to which ram pressure versus tidal…
EWOCS VII : Unveiling the faint diffuse X-ray emission in Westerlund 1
Albacete-Colombo J. F., Andersen M., De Becker M. +16
Westerlund 1 (Wd 1) is the closest supermassive star cluster to the Sun, with over 100,000 stars of all spectral types down to brown dwarfs. This population strongly heats the surr…
EWOCS-V: Is Wd1-72 a recent post-interaction WR+O binary?
C. J. K. Larkin, J. Mackey, H. Jin +14
The evolutionary origin of Wolf-Rayet (WR) stars at Solar metallicity is unclear. Single-star evolution from massive O stars, possibly via a Luminous Blue Variable phase, is challe…
EWOCS-IV: 1Ms ACIS Chandra observation of the supergiant B[e] star Wd1-9
K. Anastasopoulou, M. G. Guarcello, J. J. Drake +21
Supergiant B[e] (sgB[e]) stars are exceptionally rare objects, with only a handful of confirmed examples in the Milky Way. The evolutionary pathways leading to the sgB[e] phase rem…
New X-ray Supernova Remnants in NGC 7793
Maria Kopsacheili, Konstantina Anastasopoulou, Nanda Rea +2
This work focuses on the detection of X-ray Supernova Remnants (SNRs) in the galaxy NGC 7793 and the study of their properties. X-ray SNRs in galaxies beyond the Local Group are ra…
Disentangling the Galactic centre X-ray reflection signal using XMM-Newton data
K. Anastasopoulou, I. Khabibullin, E. Churazov +5
We investigate the X-ray emission from the Galactic Centre (GC) region, focusing on the 6.4 keV fluorescent line of neutral or weakly ionised iron, which is commonly attributed to…
EWOCS-III: JWST observations of the supermassive star cluster Westerlund 1
M. G. Guarcello, V. Almendros-Abad, J. B. Lovell +29
The typically large distances, extinction, and crowding of Galactic supermassive star clusters have so far hampered the identification of their very low mass members, required to e…
EWOCS-II: X-ray properties of the Wolf-Rayet stars in the young Galactic super star cluster Westerlund 1
K. Anastasopoulou, M. G. Guarcello, E. Flaccomio +20
We present the most comprehensive and deepest X-ray study to date of the properties of the richest Wolf-Rayet (WR) population observed in a single stellar cluster, Westerlund 1 (Wd…
EWOCS-I: The catalog of X-ray sources in Westerlund 1 from the Extended Westerlund 1 and 2 Open Clusters Survey
M. G. Guarcello, E. Flaccomio, J. F. Albacete-Colombo +48
Context. With a mass exceeding several 10^4 solar masses and a rich and dense population of massive stars, supermassive young star clusters represent the most massive star-forming…
Broadband maps of eROSITA and their comparison with the ROSAT survey
Xueying Zheng, Gabriele Ponti, Michael Freyberg +13
By June of 2020, the extended ROentgen Survey with an Imaging Telescope Array (eROSITA) on board the Spectrum Roentgen Gamma observatory had completed its first of the planned eigh…
X-rays from a Central "Exhaust Vent" of the Galactic Center Chimney
Scott C. Mackey, Mark R. Morris, Gabriele Ponti +2
Using deep archival observations from the Chandra X-ray Observatory, we present an analysis of linear X-ray-emitting features located within the southern portion of the Galactic ce…
The JWST Galactic Center Survey -- A White Paper
Rainer Schoedel, Steve Longmore, Jonny Henshaw +111
The inner hundred parsecs of the Milky Way hosts the nearest supermassive black hole, largest reservoir of dense gas, greatest stellar density, hundreds of massive main and post ma…
Discovery of periodicities in two highly variable intermediate polars towards the Galactic Center
Samaresh Mondal, Gabriele Ponti, Frank Haberl +5
We discovered Fe complex emission and pulsation in two highly variable sources (4XMM J174917.7--283329, 4XMM J174954.6--294336). The equivalent widths of 6.4 and 6.7 keV line…
Study of the excess Fe XXV line emission in the central degrees of the Galactic centre using XMM-Newton data
K. Anastasopoulou, G. Ponti, M. C. Sormani +14
The diffuse Fe XXV (6.7 keV) line emission observed in the Galactic ridge is widely accepted to be produced by a superposition of a large number of unresolved X-ray point sources.…
Non-thermal -rays from pulsation-driven shocks in Cepheids
Federico Fraschetti, Konstantina Anastasopoulou, Jeremy J. Drake +1
Rapid X-ray phase-dependent flux enhancement in the archetype classical Cepheid star ~Cep was observed by XMM-Newton and Chandra. We jointly analyse thermal and non-thermal comp…
Abundance and temperature of the outer hot circum-Galactic medium: The SRG/eROSITA view of the soft X-ray background in the eFEDS field
G. Ponti, X. Zheng, N. Locatelli +14
Despite their vital importance to understand galaxy evolution and our own Galactic ecosystem, our knowledge of the physical properties of the hot phase of the Milky Way is still in…
An intermediate polar candidate toward the Galactic plane
Samaresh Mondal, Gabriele Ponti, Frank Haberl +5
For the past decade, it has been suggested that intermediate polars (IPs), a subclass of magnetic cataclysmic variables (CVs), are one of the main contributors to the hard diffuse…
Average bolometric corrections and optical to X-ray flux measurements as a function of accretion rate for X-ray binaries
K. Anastasopoulou, A. Zezas, J. F. Steiner +1
In this paper we use an RXTE library of spectral models from 10 black-hole and 9 pulsar X-ray binaries, as well as model spectra available in the literature from 13 extra-galactic…
Metallicity and X-ray luminosity variations in NGC 922
Konstantinos Kouroumpatzakis, Andreas Zezas, Anna Wolter +3
We present a systematic study of the metallicity variations within the collisional ring galaxy NGC 922 based on long-slit optical spectroscopic observations. We find a metallicity…
Do sub-galactic regions follow the galaxy-wide X-ray scaling relations? The example of NGC 3310 and NGC 2276
K. Anastasopoulou, A. Zezas, V. Gkiokas +1
We present results from Chandra observations of the X-ray starburst galaxies NGC 3310 and NGC 2276. We detect 27 discrete sources in NGC 3310, and 19 discrete sources in NGC 2276 w…
A deep Chandra observation of the interacting star-forming galaxy Arp 299
K. Anastasopoulou, A. Zezas, L. Ballo +1
We present results from a 90 ks Chandra ACIS-S observation of the X-ray luminous interacting galaxy system Arp 299 (NGC 3690/IC 694). We detect 25 discrete X-ray sources with lumin…