Search Publications
Using MARSIS signal attenuation to assess the presence of South Polar Layered Deposit subglacial brines
Orosei, Roberto; Caprarelli, Graziella; Pettinelli, Elena +7 more
Knowledge of the physical and thermal properties of the South Polar Layer Deposits (SPLD) is key to constrain the source of bright basal reflections at Ultimi Scopuli detected by the MARSIS (Mars Advanced Radar for Subsurface and Ionosphere Sounding) radar sounder. Here we present a detailed analysis of attenuation, based on data acquired by MARSI…
The Influence Of Individual Stars On The long-Term Dynamics Of Comets C/2014 UN271 And C/2017 K2
Dybczyński, Piotr A.; Królikowska, Małgorzata
Context. In June 2021, the discovery of an unusual comet C/2014 UN271 (Bernardinelli-Bernstein) was announced. Its cometary activity beyond the orbit of Uranus has also refreshed interest in similar objects, including C/2017 K2 (PANSTARRS). Another peculiarity of these objects is the long interval of positional data, taken at large heli…
PASSAGES: the Large Millimeter Telescope and ALMA observations of extremely luminous high-redshift galaxies identified by the Planck
Frye, B. L.; Terlevich, E.; Terlevich, R. +20 more
The Planck All-Sky Survey to Analyze Gravitationally-lensed Extreme Starbursts project aims to identify a population of extremely luminous galaxies using the Planck all-sky survey and to explore the nature of their gas fuelling, induced starburst, and the resulting feedback that shape their evolution. Here, we report the identification of 22 high-…
A Method of Improving Standard Stellar Luminosities with Multiband Standard Bolometric Corrections
Bakış, V.; Eker, Z.
Standard luminosity (L) of 406 main-sequence stars with the most accurate astrophysical parameters are calculated from their absolute magnitudes and bolometric corrections at Johnson BV, and Gaia EDR3 G, GBP, GRP filters. Required multiband BC and BC-Teff relations are obtained first from the parameters of 209 Doub…
SDSS-IV MaStar: theoretical atmospheric parameters for the MaNGA stellar library
Merrifield, Michael; Bizyaev, Dmitry; Law, David R. +16 more
We calculate the fundamental stellar parameters effective temperature, surface gravity, and iron abundance - Teff, log g, [Fe/H] - for the final release of the Mapping Nearby Galaxies at APO (MaNGA) Stellar Library (MaStar), containing 59 266 per-visit-spectra for 24 290 unique stars at intermediate resolution (R ~ 1800) and high S/N (m…
A Case for Electron-Astrophysics
Verscharen, Daniel; D'Amicis, Raffaella; Bruno, Roberto +27 more
The smallest characteristic scales, at which electron dynamics determines the plasma behaviour, are the next frontier in space and astrophysical plasma research. The analysis of astrophysical processes at these scales lies at the heart of the research theme of electron-astrophysics. Electron scales are the ultimate bottleneck for dissipation of pl…
Disconnecting the Dots: Re-examining the Nature of Stellar "Strings" in the Milky Way
Peek, J. E. G.; Zucker, Catherine; Loebman, Sarah
Recent analyses of Gaia data have resulted in the identification of new stellar structures, including a new class of extended stellar filaments called stellar "strings," first proposed by Kounkel & Covey. We explore the spatial, kinematic, and chemical composition of strings to demonstrate that these newfound structures are largely inconsisten…
The X-Ray Luminosity Function Evolution of Quasars and the Correlation between the X-Ray and Ultraviolet Luminosities
Singal, J.; Mutchnick, S.; Petrosian, V.
We explore the evolution of the X-ray luminosity function of quasars and the intrinsic correlation between the X-ray and 2500 Å ultraviolet luminosities, utilizing techniques verified in previous works and a sample of over 4000 quasars detected with Chandra and XMM-Newton in the range 0 < z < 5. We find that quasars have undergone significan…
A New X-Ray Tidal Disruption Event Candidate with Fast Variability
Greiner, J.; Komossa, S.; Erben, T. +3 more
During a close encounter between a star and a supermassive black hole, the star can get disrupted by the black hole's tidal forces, resulting in a tidal disruption event (TDE). The accretion of the star's material onto the black hole produces strong emission in different wavelength regimes. Here we report the discovery with the Roentgen Satellite …
Weak gravitational lensing shear measurement with FPFS: analytical mitigation of noise bias and selection bias
Massey, Richard; Li, Xiangchong; Li, Yin
Dedicated 'Stage IV' observatories will soon observe the entire extragalactic sky, to measure the 'cosmic shear' distortion of galaxy shapes by weak gravitational lensing. To measure the apparent shapes of those galaxies, we present an improved version of the Fourier Power Function Shapelets (FPFS) shear measurement method. This now includes analy…