Search Publications
Missions
Journals
Publication Years
A photodissociation region (PDR) model grid in planetary nebula paradigm: dependency of C and O fine structure line emission and PDR thermal structure on central star radiation and nebular dust composition
Das, Ramkrishna; Bandyopadhyay, Rahul
We compute a grid of photodissociation region (PDR) models. The varying parameters of the grid include effective temperature (Teff) and luminosity (L) of the radiation source, density (nH) of the nebula, PDR depth from the nebular ionization front (ΔrPDR), and densities of polycyclic aromatic hydrocarbon (PAH) mole…
Variable stars in the field of open cluster NGC 6819
Karimov, R. G.; Gaysin, R. A.
Here we present preliminary results of searching and study of variable stars based on space observation data of the TESS mission in the field of the open star cluster NGC 6819. The light curves of variable stars of various types located in the field of an open cluster are studied. Based on the data from the GAIA DR3 mission, the probable members o…
Variation of temperature and non-thermal velocity with height in fan loops
Tripathi, Durgesh; Sharma, Aishawnnya
We study the variation of temperature and non-thermal velocity with height in fan loops. For this purpose, we have used the observations recorded by the Extreme Ultraviolet Imaging Spectrometer onboard Hinode. We have employed the emission measure (EM)-loci method to estimate the temperatures of different coronal fan loops and then compute the non…
A Comprehensive Measurement of the Local Value of the Hubble Constant with 1 km s-1 Mpc-1 Uncertainty from the Hubble Space Telescope and the SH0ES Team
Casertano, Stefano; Filippenko, Alexei V.; Jones, David O. +15 more
We report observations from the Hubble Space Telescope (HST) of Cepheid variables in the host galaxies of 42 Type Ia supernovae (SNe Ia) used to calibrate the Hubble constant (H 0). These include the complete sample of all suitable SNe Ia discovered in the last four decades at redshift z ≤ 0.01, collected and calibrated from ≥1000 HST o…
The Pantheon+ Analysis: Cosmological Constraints
Filippenko, Alexei V.; Coulter, David A.; Foley, Ryan J. +45 more
We present constraints on cosmological parameters from the Pantheon+ analysis of 1701 light curves of 1550 distinct Type Ia supernovae (SNe Ia) ranging in redshift from z = 0.001 to 2.26. This work features an increased sample size from the addition of multiple cross-calibrated photometric systems of SNe covering an increased redshift span, and im…
Challenges for ΛCDM: An update
Perivolaropoulos, L.; Skara, F.
A number of challenges to the standard ΛCDM model have been emerging during the past few years as the accuracy of cosmological observations improves. In this review we discuss in a unified manner many existing signals in cosmological and astrophysical data that appear to be in some tension (2 σ or larger) with the standard ΛCDM model as specified …
The Pantheon+ Analysis: The Full Data Set and Light-curve Release
Filippenko, Alexei V.; Kilpatrick, Charles D.; Coulter, David A. +27 more
Here we present 1701 light curves of 1550 unique, spectroscopically confirmed Type Ia supernovae (SNe Ia) that will be used to infer cosmological parameters as part of the Pantheon+ SN analysis and the Supernovae and H 0 for the Equation of State of dark energy distance-ladder analysis. This effort is one part of a series of works that …
Euclid preparation. I. The Euclid Wide Survey
Aussel, H.; Cimatti, A.; Schultheis, M. +242 more
Euclid is a mission of the European Space Agency that is designed to constrain the properties of dark energy and gravity via weak gravitational lensing and galaxy clustering. It will carry out a wide area imaging and spectroscopy survey (the Euclid Wide Survey: EWS) in visible and near-infrared bands, covering approximately 15 000 deg2 …
Two Remarkably Luminous Galaxy Candidates at z ≈ 10-12 Revealed by JWST
Strait, Victoria; van Dokkum, Pieter; Conroy, Charlie +22 more
The first few 100 Myr at z > 10 mark the last major uncharted epoch in the history of the universe, where only a single galaxy (GN-z11 at z ≈ 11) is currently spectroscopically confirmed. Here we present a search for luminous z > 10 galaxies with JWST/NIRCam photometry spanning ≈1-5 µm and covering 49 arcmin2 from the public…
The LOFAR Two-metre Sky Survey. V. Second data release
Prandoni, I.; Zhang, X.; Di Gennaro, G. +103 more
In this data release from the ongoing LOw-Frequency ARray (LOFAR) Two-metre Sky Survey we present 120-168 MHz images covering 27% of the northern sky. Our coverage is split into two regions centred at approximately 12h45m +44°30' and 1h00m +28°00' and spanning 4178 and 1457 square degrees respectively. The images were derived from 3451 h (7.6 PB) …