Search Publications
Obscured AGN enhancement in galaxy pairs at cosmic noon: evidence from a probabilistic treatment of photometric redshifts
Kocevski, Dale D.; Rosario, D. J.; Harrison, C. M. +1 more
Observations of the nearby universe reveal an increasing fraction of active galactic nuclei (AGNs) with decreasing projected separation for close galaxy pairs, relative to control galaxies. This implies galaxy interactions play a role in enhancing AGN activity. However, the picture at higher redshift is less established, partly due to limited spec…
The AGN fraction in high-redshift protocluster candidates selected by Planck and Herschel
Frye, Brenda; Demarco, Ricardo; Rettura, Alessandro +4 more
A complete understanding of the mass assembly history of structures in the Universe requires the study of the growth of galaxies and their supermassive black holes (SMBHs) as a function of their local environment over cosmic time. In this context, it is important to quantify the effects that the early stages of galaxy cluster development have on t…
A new kinematic model of the Galaxy: analysis of the stellar velocity field from Gaia Data Release 3
Lattanzi, M. G.; Re Fiorentin, P.; Bucciarelli, B. +4 more
This work presents the results of a kinematic analysis of the Galaxy that uses a new model as applied to the newest available Gaia data. We carry out the Taylor decomposition of the velocity field up to second order for 18 million high luminosity stars (i.e. OBAF-type stars, giants, and subgiants) from the Gaia DR3 data. We determine the component…
The S-PLUS Fornax Project (S+FP): A first 12-band glimpse of the Fornax galaxy cluster
Demarco, R.; Mendes de Oliveira, C.; Lopes, P. A. A. +40 more
The Fornax galaxy cluster is the richest nearby (D ~ 20 Mpc) galaxy association in the southern sky. As such, it provides a wealth of opportunities to elucidate on the processes where environment holds a key role in transforming galaxies. Although it has been the focus of many studies, Fornax has never been explored with contiguous homogeneous wid…
When, where, and how star formation happens in a galaxy pair at cosmic noon using CANUCS JWST/NIRISS grism spectroscopy
Willott, Chris J.; Martis, Nicholas S.; Bradač, Maruša +13 more
Spatially resolved studies are key to understanding when, where, and how stars form within galaxies. Using slitless grism spectra and broad-band imaging from the CAnadian NIRISS Unbiased Cluster Survey (CANUCS), we study the spatially resolved properties of a strongly lensed (µ = 5.4$\pm$1.8) z = 0.8718 galaxy pair consisting of a blue face-…
Reflection physics in X-ray-emitting symbiotic stars
Toalá, Jesús A.
X-ray-emitting symbiotic stars exhibit a variety of spectral shapes classified as α, β, γ, δ, and β/δ types, which have been attributed to different phenomena such as thermonuclear burning on the surface of the white dwarf component, shocks between winds and jets with the red giant companion's extended atmosphere, the presence of heavily extinguis…
Planetary perturbers: flaring star-planet interactions in Kepler and TESS
Ilin, Ekaterina; Alvarado-Gómez, Julián D.; Poppenhäger, Katja +2 more
In many star-planet systems discovered so far, the innermost planet orbits within only a few stellar radii. In these systems, planets could become in situ probes of the extended stellar magnetic field. Because they disturb the field as they move, they are expected to trigger flares in the corona. Potential differences to the energies and morpholog…
Transient fading X-ray emission detected during the optical rise of a tidal disruption event
Liu, Z.; Merloni, A.; Rau, A. +9 more
We report on the SRG/eROSITA detection of ultra-soft ($kT=47^{+5}_{-5}$ eV) X-ray emission (LX =$2.5^{+0.6}_{-0.5} \times 10^{43}$ erg s-1) from the tidal disruption event (TDE) candidate AT 2022dsb ~14 d before peak optical brightness. As the optical luminosity increases after the eROSITA detection, then the 0.2-2 keV observ…
The EBLM Project XII. An eccentric, long-period eclipsing binary with a companion near the hydrogen-burning limit
Trifonov, Trifon; Henning, Thomas; Triaud, Amaury H. M. J. +17 more
In the hunt for Earth-like exoplanets, it is crucial to have reliable host star parameters, as they have a direct impact on the accuracy and precision of the inferred parameters for any discovered exoplanet. For stars with masses between 0.35 and 0.5 M⊙, an unexplained radius inflation is observed relative to typical stellar models. How…
Studying [C II] emission in low-mass galaxies at z 7
Strait, Victoria; Fujimoto, Seiji; Vallini, Livia +8 more
We report on a $\rm {[CII]}_{158\mu \rm {m}}$ search using the Atacama Large Millimeter/submillimeter Array (ALMA) on three lensed, confirmed Ly α emitting galaxies at z ~ 7. Our targets are ultraviolet (UV) faint systems with stellar masses on the order of M* ~ 109 M⊙. We detect a single [C II] line emission (4σ) …