Search Publications
Mixing of Hot Shocked Plasma with Cold Gas in Nova YZ Ret 2020
Drake, Jeremy J.; Ness, Jan-Uwe; Behar, Ehud +5 more
The origin of bright X-ray emission lines that appear late in a nova eruption remains largely a puzzle. We present two high-resolution X-ray grating spectra of the classical nova YZ Ret, observed 77 and 115 days post-eruption, using XMM-Newton and Chandra, respectively. Both spectra feature resolved emission lines blueshifted by v = –1500 km s
The powerful lens galaxy cluster PLCK G287.0+32.9 (θE ∼ 43″). Redshift catalog and new lens model using MUSE observations
Grillo, C.; Tozzi, P.; Rosati, P. +17 more
Aims: We present a new high-precision strong-lensing model of PLCK G287.0+32.9, a massive lens galaxy cluster at z = 0.383, with the aim of obtaining an accurate estimation of its effective Einstein radius and total mass distribution. We also present a spectroscopic catalog containing accurate redshift measurements for close to 500 objects up…
Skipping a beat: Discovery of persistent quasi-periodic oscillations associated with pulsed fraction drop of the spin signal in M51 ULX-7
Wolter, Anna; Pintore, Fabio; Esposito, Paolo +24 more
Context. The discovery of pulsations in (at least) six ultraluminous X-ray sources (ULXs) has shown that neutron stars can accrete at (highly) super-Eddington rates, challenging the standard accretion theories. M51 ULX-7, with a spin signal of P ≃ 2.8 s, is the pulsating ULX (PULX) with the shortest known orbital period (Porb ≃ 2 d) and…
New insights on the dynamics of satellite galaxies: Effects of the figure rotation of a host galaxy
Chiba, Masashi; Sato, Genta
We investigate a mechanism to form and keep a planar spatial distribution of satellite galaxies in the Milky Way (MW), which is called the satellite plane. It has been pointed out that the ΛCDM cosmological model hardly explains the existence of such a satellite plane, so it is regarded as one of the serious problems in the current cosmology. We h…
A Lens Finder Map to Check Claimed High-z Galaxies behind SMACS J0723.3-7327
Broadhurst, Tom; Windhorst, Rogier; Summers, Jake +5 more
The first science image released by the James Webb Space Telescope (JWST) reveals numerous galaxies in the distant background of the galaxy cluster SMACS J0723.3-7327. Some have claimed redshifts of up to z ≃ 20, challenging standard cosmological models for structure formation. Here, we present a lens model for SMACS J0723.3-7327 anchored on five …
A Measurement of the Assembly of Milky Way Analogs at Redshifts 0.5 < z < 2 with Resolved Stellar Mass and Star Formation Rate Profiles
Muzzin, Adam; Sarrouh, Ghassan T. E.; Marchesini, Danilo +3 more
The resolved mass assembly of Milky Way–mass galaxies has been previously studied in simulations, the local Universe, and at higher redshifts using infrared (IR) light profiles. To better characterize the mass assembly of Milky Way analogs (MWAs), as well as their changes in star formation rate (SFR) and color gradients, we construct resolved stel…
The Application of Manifold Learning to a Selection of Different Galaxy Populations and Scaling Relation Analysis
Reddy, Naveen A.; Azadi, Mojegan; Shivaei, Irene +8 more
The growing volume of data produced by large astronomical surveys necessitates the development of efficient analysis techniques capable of effectively managing high-dimensional data sets. This study addresses this need by demonstrating some applications of manifold learning and dimensionality reduction techniques, specifically the self-organizing …
Exploring Galactic open clusters with Gaia: I. An examination in the first kiloparsec
Vieira, Katherine; García-Varela, Alejandro; Alfonso, Jeison
Context. Since the first publication of the Gαία catalogue, a new view of our Galaxy has arrived. Its astrometric and photometric information has improved the precision of the physical parameters of open star clusters obtained from them. Aims. Using the Gaia Data Release 3 (DR3) catalogue, our aim was to find physical stellar members including fai…
Constraining stellar tidal quality factors from planet-induced stellar spin-up
Chiappini, Cristina; Poppenhaeger, Katja; Ilić, Nikoleta +1 more
The dynamical evolution of tight star-planet systems is influenced by tidal interactions between the star and the planet, as was shown recently. The rate at which spins and orbits in such a system evolve depends on the stellar and planetary tidal dissipation efficiency. Here, we present a method to constrain the modified tidal quality factor Q
Galaxy spin direction asymmetry in JWST deep fields
Shamir, Lior
The unprecedented imaging power of James Webb Space Telescope (JWST) provides new abilities to observe the shapes of objects in the early Universe in a way that has not been possible before. Recently, JWST acquired a deep field image inside the same field imaged in the past as the Hubble Space Telescope (HST) Ultra Deep Field. Computer-based quant…