Search Publications
Indications of magnetic accretion in Swift J0826.2‑7033
Mukai, Koji; Falanga, Maurizio; Masetti, Nicola +3 more
We present our findings from the first long X-ray observation of the hard X-ray source Swift J0826.2‑7033 with XMM-Newton, which has shown characteristics of magnetic accretion. The system appears to have a long orbital period (∼7.8 h) accompanied by short timescale variabilities, which we tentatively interpret as the spin and beat periods of an i…
Mapping thermal emission in the synchrotron-dominated supernova remnants G330.2+1.0, 3C58, and RX J1713.7-3946
Mori, K.; Acero, F.; Williams, B. J. +1 more
Aims: Since the discovery of synchrotron X-ray emission from the shell of the supernova remnant (SNR) SN 1006, multiple observations from Chandra and XMM-Newton have shown that many young SNRs produce synchrotron emission in X-rays. Among those, a few peculiar SNRs have their X-ray emission largely dominated by synchrotron radiation, showing …
Gas flows in the central region of the Seyfert galaxy NGC 4593 with MUSE
Knapen, J. H.; Comerón, S.; Pereira-Santaella, M. +4 more
Context. Understanding how gas flows into galactic centres, fuels the active galactic nucleus (AGN), and is in turn expelled back through feedback processes is of great importance to appreciate the role AGN play in the growth and evolution of galaxies. Aims. We use Multi Unit Spectroscopic Explorer-adaptive optics (MUSE-AO) optical spectra of the …
Hubble Space Telescope proper motions of Large Magellanic Cloud star clusters: I. Catalogues and results for NGC 1850
Martocchia, S.; Cabrera-Ziri, I.; Bastian, N. +11 more
We present proper motion (PM) measurements for a sample of 23 massive star clusters within the Large Magellanic Cloud using multi-epoch data from the Hubble Space Telescope (HST). We combined archival data from the ACS/WFC and WFC3/UVIS instruments with observations from a dedicated HST programme, resulting in time baselines between 4.7 and 18.2 y…
The Lockman-SpReSO project. Main properties of infrared-selected star-forming galaxies
Krongold, Yair; Sánchez-Portal, Miguel; Bongiovanni, Ángel +18 more
Aims: In this work, we carry out a comprehensive study using galaxy data from the Lockman Spectroscopic Redshift Survey using Osiris (Lockman-SpReSO) project, a far-infrared (FIR) selected sample of galaxies observed using optical spectroscopy. We analyse a sub-sample of star-forming galaxies (SFGs) with secure spectroscopic redshifts, mostly…
A comprehensive study of five candidate δ Scuti-type pulsators in detached eclipsing binaries
Hełminiak, K. G.; Konacki, M.; Moharana, A. +4 more
Context. Pulsating stars in eclipsing binaries (EBs) provide an excellent opportunity to obtain precise, model-independent stellar parameters for studying these oscillations in detail. One of the most common classes of pulsators found in such EBs exhibits δ Scuti-type oscillations. Characterising these pulsators using the precise stellar parameter…
Rotation in stellar evolution: Probing the influence on population synthesis in high-redshift galaxies
Sun, Weijia
Stellar population synthesis (SPS) is essential for understanding galaxy formation and evolution. However, the recent discovery of rotation-driven phenomena in star clusters warrants a review of uncertainties in SPS models caused by overlooked factors, including stellar rotation. In this study, we investigated the impact of rotation on SPS specifi…
Two stellar populations with different metallicities in the low-mass globular cluster Gran 5
Chung, Chul; Lee, Young-Wook; Koch-Hansen, Andreas J. +3 more
Context. With the increasing number of discoveries of globular clusters in the inner Milky Way, the need for spectroscopic confirmation and further investigation of their stellar populations and chemodynamical properties has become crucial. Aims. Gran 5 is a newly reported low-mass globular cluster located close to the Galactic center, and it is t…
High-resolution spectroscopy of detached eclipsing binaries during total eclipses
Hełminiak, K. G.; Olszewska, J. M.; Pawar, T. +1 more
Context. We present results of high-resolution spectroscopic observations of detached eclipsing binaries (DEBs) with total eclipses, for which UVES spectra were obtained during the phase of totality. These observations serve as a key way to determine the age and initial metallicity of the systems and to verify evolutionary phases of their componen…
The Blanco DECam Bulge Survey (BDBS). VIII. Chemo-kinematics in the southern Galactic bulge from 2.3 million red clump stars with Gaia DR3 proper motions
Rich, R. Michael; Kunder, Andrea; Johnson, Christian I. +5 more
Context. The inner Galaxy is a complex environment, and the relative contributions of different formation scenarios to its observed morphology and stellar properties are still debated. The different components are expected to have different spatial, kinematic, and metallicity distributions, and a combination of photometric, spectroscopic, and astr…