Search Publications
GlobULeS. IV. UVIT/AstroSat Detection of Extremely Low Mass White Dwarf Companions to Blue Straggler Stars in NGC 362
Dattatrey, Arvind K.; Yadav, R. K. S.; Sahu, Snehalata +4 more
We report the discovery of extremely low mass white dwarfs (ELM WDs) as a companion of blue straggler stars (BSSs) in the Galactic globular cluster NGC 362 using images from AstroSat's Ultra Violet Imaging Telescope (UVIT). Spectral energy distributions (SEDs) for 26 far-UV (FUV) bright member BSSs are created using data from the UVIT, the UltraVi…
The ESO-VLT MIKiS Survey Reloaded: Exploring the Internal Kinematics of NGC 6440
Vesperini, Enrico; Cadelano, Mario; Pallanca, Cristina +7 more
In the context of the ESO-VLT Multi-Instrument Kinematic Survey of Galactic globular clusters, here we present the line-of-sight velocity dispersion profile of NGC 6440, a massive globular cluster located in the Galactic bulge. By combining the data acquired with four different spectrographs, we obtained the radial velocity of a sample of ~1800 in…
A New Galaxy Cluster Merger Capable of Probing Dark Matter: A56
Finner, Kyle; Wittman, David; Stancioli, Rodrigo +3 more
We report the discovery of a binary galaxy cluster merger via a search of the redMaPPer optical cluster catalog, with a projected separation of 535 kpc between the brightest cluster galaxies (BCGs). Archival XMM-Newton spectro-imaging reveals a gas peak between the BCGs, suggesting a recent pericenter passage. We conduct a galaxy redshift survey t…
Deep X-Ray and Radio Observations of the First Outburst of the Young Magnetar Swift J1818.0-1607
Campana, S.; Tiengo, A.; Götz, D. +23 more
Swift J1818.0-1607 is a radio-loud magnetar with a spin period of 1.36 s and a dipolar magnetic field strength of B ~ 3 × 1014 G, which is very young compared to the Galactic pulsar population. We report here on the long-term X-ray monitoring campaign of this young magnetar using XMM-Newton, NuSTAR, and Swift from the activation of its …
Morphological Parameters and Associated Uncertainties for 8 Million Galaxies in the Hyper Suprime-Cam Wide Survey
Kartaltepe, Jeyhan S.; Nagai, Daisuke; Natarajan, Priyamvada +10 more
We use the Galaxy Morphology Posterior Estimation Network (GaMPEN) to estimate morphological parameters and associated uncertainties for ~8 million galaxies in the Hyper Suprime-Cam Wide survey with z ≤ 0.75 and m ≤ 23. GaMPEN is a machine-learning framework that estimates Bayesian posteriors for a galaxy's bulge-to-total light ratio (L B
A Diverse Population of z 2 ULIRGs Revealed by JWST Imaging
Wang, T.; Rigopoulou, D.; Yan, Haojing +12 more
Four ultraluminous infrared galaxies (ULIRGs) observed with JWST/NIRcam in the Cosmos Evolution Early Release Science program offer an unbiased preview of the z ~ 2 ULIRG population. The objects were originally selected at 24 µm and have strong polycyclic aromatic hydrocarbon emission features observed with Spitzer/Infrared Spectrometer. The…
New Near-infrared Period-Luminosity-Metallicity Relations for Galactic RR Lyrae Stars Based on Gaia EDR3 Parallaxes
Gieren, Wolfgang; Pietrzyński, Grzegorz; Pilecki, Bogumił +13 more
We present new period-luminosity and period-luminosity-metallicity relations for Galactic RR Lyrae stars based on a sample of 28 pulsators located at distances of up to 1.5 kpc from the Sun. Near-infrared photometry was obtained at the Cerro Armazones Observatory, and parallaxes were taken from the Gaia Early Data Release 3. Relations were determi…
A Flat-spectrum Radio Transient at 122 Mpc Consistent with an Emerging Pulsar Wind Nebula
Hallinan, Gregg; Dong, Dillon Z.
We report the discovery and follow-up observations of VT 1137-0337, an unusual radio transient found in our systematic search for extragalactic explosions in the Very Large Array Sky Survey. It is located in the brightest region of a dwarf starburst galaxy at a luminosity distance of 121.6 Mpc. Its 3 GHz luminosity is comparable to luminous radio …
Disentangling the AGN and Star formation Contributions to the Radio-X-Ray Emission of Radio-loud Quasars at 1 < Z < 2
Azadi, Mojegan; Fazio, Giovanni G.; Meyer, Eileen T. +12 more
We constrain the emission mechanisms responsible for the prodigious electromagnetic output generated by active galactic nuclei (AGNs) and their host galaxies with a novel state-of-the-art AGN radio-to-X-ray spectral energy distribution model fitting code (ARXSED). ARXSED combines multiple components to fit the spectral energy distributions (SEDs) …
ALMA Resolves the First Strongly Lensed Optical/Near-IR-dark Galaxy
Lapi, Andrea; Bressan, Alessandro; Perrotta, Francesca +6 more
We present high-resolution (≲0.″1) Atacama Large Millimeter/submillimeter Array observations of the strongly lensed galaxy HATLASJ113526.2-01460 at redshift z ∼ 3.1, discovered in the GAMA 12th field of the Herschel-ATLAS survey. This gravitationally lensed system is remarkably peculiar, in that neither the background source nor the foreground len…