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The Accretion History of EX Lup: A Century of Bursts, Outbursts, and Quiescence
Fang, Min; Herczeg, Gregory J.; Johnstone, Doug +11 more
EX Lup is the archetype for the class of young stars that undergoes repeated accretion outbursts of ~5 mag at optical wavelengths that last for months. Despite extensive monitoring that dates back 130 yr, the accretion history of EX Lup remains mostly qualitative and has large uncertainties. We assess historical accretion rates of EX Lup by applyi…
Ironing the folds: the phase space chevrons of a GSE-like merger as a dark matter subhalo detector
Vasiliev, Eugene; Belokurov, Vasily; Evans, N. Wyn +2 more
Recent work uncovered features in the phase space of the Milky Way's stellar halo which may be attributed to the last major merger. When stellar material from a satellite is accreted onto its host, it phase mixes and appears finely substructured in phase space. For a high-eccentricity merger, this substructure most clearly manifests as numerous wr…
Chemical enrichment of the ICM within the virgo cluster - I. Radial profiles
Fabian, A. C.; Pinto, C.; Eckert, D. +8 more
We present a detailed analysis of the elemental abundances distribution of the Virgo cluster using XMM-Newton observations. We included in the analysis a new EPIC-pn energy scale calibration which allow us to measure velocities with uncertainties down to Δv ~150 km s-1. We investigate the radial distribution of O, Ne, Mg, Si, Ar, S, Ca,…
Standardized Luminosity of the Tip of the Red Giant Branch Utilizing Multiple Fields in NGC 4258 and the CATs Algorithm
Casertano, Stefano; Li, Siyang; Riess, Adam G. +6 more
The tip of the red giant branch provides a luminous standard candle for calibrating distance ladders that reach Type Ia supernova (SN Ia) hosts. However, recent work reveals that tip measurements vary at the ~0.1 mag level for different stellar populations and locations within a host, which may lead to inconsistencies along the distance ladder. We…
Nuclear activity in z < 0.3 QSO 2's mainly triggered by galaxy mergers
Storchi-Bergmann, Thaisa; Dall'Agnol de Oliveira, Bruno; Araujo, Bruna L. C. +2 more
We investigate the role of the close environment on the nuclear activity of a sample of 436 nearby (z < 0.3) QSO 2's - selected from SDSS-III spectra, via comparison of their environment and interaction parameters with those of a control sample of 1308 galaxies. We have used the corresponding SDSS images to obtain the number of neighbour galaxi…
The VISCACHA survey - VII. Assembly history of the Magellanic Bridge and SMC Wing from star clusters
Minniti, D.; Bica, E.; Barbuy, B. +15 more
The formation scenario of the Magellanic Bridge during an encounter between the Large and Small Magellanic Clouds ~200 Myr ago, as proposed by N-body models, would be imprinted in the chemical enrichment and kinematics of its stars and sites of ongoing star formation along its extension. We present an analysis of 33 Bridge star clusters using phot…
Kepler K2 and TESS Observations of Two Magnetic Cataclysmic Variables: The New Asynchronous Polar SDSS J084617.11+245344.1 and Paloma
Rappaport, Saul A.; Jayaraman, Rahul; Garnavich, Peter +7 more
There have been relatively few published long-duration, uninterrupted light curves of magnetic cataclysmic variable stars in which the accreting white dwarf's rotational frequency is slightly desynchronized from the binary orbital frequency. We report Kepler K2 and TESS observations of two such systems. The first, SDSS J084617.11+245344.1, was obs…
3D physico-chemical model of a pre-stellar core. I. Environmental and structural impact on the distribution of CH3OH and c-C3H2
Caselli, P.; Jensen, S. S.; Spezzano, S. +2 more
Context. Pre-stellar cores represent the earliest stage of the formation process of stars and planets. By characterizing the physical and chemical structure of these cores, we can establish the initial conditions for star and planet formation and determine to what degree the chemical composition of pre-stellar cores is inherited by the later stage…
Hubble Space Telescope and Hyper-Suprime-Cam Weak-lensing Study of the Equal-mass Dissociative Merger CIZA J0107.7+5408
Clarke, Tracy E.; Giacintucci, Simona; Jee, M. James +6 more
A dissociative merger is formed by the interplay of ram pressure and gravitational forces, which can lead to a spatial displacement of the dark matter and baryonic components of the recently collided subclusters. CIZA J0107.7+5408 is a nearby (z = 0.105) dissociative merger that hosts two X-ray brightness peaks and a bimodal galaxy distribution. A…
The SOUL view of IRAS 20126+4104. Kinematics and variability of the H2 jet from a massive protostar
Sanna, A.; Leurini, S.; Esposito, S. +20 more
Context. We exploit the increased sensitivity of the recently installed adaptive optics SOUL at the LBT to obtain new high-spatial-resolution near-infrared images of the massive young stellar object IRAS20126+4104 and its outflow.
Aims: We aim to derive the jet proper motions and kinematics, as well as to study its photometric variability by …