Search Publications
Chemical Mapping of Temperate Sub-Neptune Atmospheres: Constraining the Deep Interior H2O/H2 Ratio from the Atmospheric CO2/CH4 Ratio
Yang, Jeehyun; Hu, Renyu
Understanding the planetary envelope composition of sub-Neptune-type exoplanets is challenging due to the inherent degeneracy in their interior composition scenarios. Particularly, the planetary envelope's H2O/H2 ratio, which can also be expressed as the O/H ratio, provides crucial insights into its original location relative…
A Deep uGMRT View of the Ultra-steep Spectrum Radio Halo in A521
Brunetti, G.; Santra, R.; Kale, R. +8 more
We present the first detailed analysis of the ultra-steep spectrum radio halo in the merging galaxy cluster A521, based on upgraded Giant Metrewave Radio telescope observations. The combination of radio observations (300–850 MHz) and archival X-ray data provides a new window into the complex physics occurring in this system. When compared to all p…
What Is the Black Hole Spin in Cyg X-1?
Zdziarski, Andrzej A.; Szanecki, Michał; Dewangan, Gulab +6 more
We perform a detailed study of the black hole spin of Cyg X-1, using accurate broadband X-ray data obtained in the soft spectral state by simultaneous NICER and NuSTAR observations, supplemented at high energies by INTEGRAL data. We use the relativistic disk model kerrbb together with different models of the Comptonization high-energy tail and the…
The Galaxy Activity, Torus, and Outflow Survey (GATOS). IV. Exploring Ionized Gas Outflows in Central Kiloparsec Regions of GATOS Seyferts
Bunker, Andrew J.; Imanishi, Masatoshi; Gandhi, Poshak +33 more
Utilizing JWST MIRI/Medium Resolution Spectrograph integral field unit observations of the kiloparsec-scale central regions, we showcase the diversity of ionized gas distributions and kinematics in six nearby Seyfert galaxies included in the GATOS survey. Specifically, we present spatially resolved flux distribution and velocity field maps of six …
Environmental Effects on the Stellar Mass Function in a z ∼ 3.3 Overdensity of Galaxies in the COSMOS Field
Cooper, M. C.; Urbano Stawinski, Stephanie M.; Hathi, Nimish +17 more
We present an analysis of the number density of galaxies as a function of stellar mass (i.e., the stellar mass function (SMF)) in the COSMOS field at z ∼ 3.3, making a comparison between the SMF in overdense environments and the SMF in the coeval field. In particular, this region contains the Elentári proto-supercluster, a system of six extended o…
Active Dwarf Galaxy Database. I. Overlap between Active Galactic Nuclei Selected by Different Techniques
Wasleske, Erik J.; Baldassare, Vivienne F.
We assemble a sample of 733 dwarf galaxies (M * ≤ 109.5 M ⊙) with signatures of active galactic nuclei (AGN) and explore the intersection between different AGN-selection techniques. Objects in our database are compiled from previous studies that identify AGN in dwarf galaxies through spectroscopy, X-ray emission, i…
Multiphase Black Hole Feedback and a Bright [C II] Halo in a LoBAL Quasar at z ∼ 6.6
Carniani, Stefano; Tripodi, Roberta; Lai, Samuel +18 more
Although the mass growth of supermassive black holes during the epoch of reionization is expected to play a role in shaping the concurrent growth of their host galaxies, observational evidence of feedback at z ≳ 6 is still sparse. We perform the first multiscale and multiphase characterization of black-hole-driven outflows in the z ∼ 6.6 quasar J0…
Constraints on the Lyman Continuum Escape from Low-mass Lensed Galaxies at 1.3 ≤ z ≤ 3.0
Finkelstein, Steven L.; Ferguson, Henry C.; Grazian, Andrea +17 more
Low-mass galaxies can significantly contribute to reionization due to their potentially high Lyman continuum (LyC) escape fraction and relatively high space density. We present a constraint on the LyC escape fraction from low-mass galaxies at z = 1.3–3.0. We obtained rest-frame UV continuum imaging with the ACS/SBC and the WFC3/UVIS from the Hubbl…
Tip of the Red Giant Branch Distances with JWST. II. I-band Measurements in a Sample of Hosts of 10 Type Ia Supernova Match HST Cepheids
Casertano, Stefano; Li, Siyang; Riess, Adam G. +7 more
The Hubble Tension, a >5σ discrepancy between direct and indirect measurements of the Hubble constant (H 0), has persisted for a decade and motivated intense scrutiny of the paths used to infer H 0. Comparing independently derived distances for a set of galaxies with different standard candles, such as the tip of the red g…
An Empirical Calibration of the Tip of the Red Giant Branch Distance Method in the Near Infrared. II. JWST NIRCam Wide Filters
McQuinn, Kristen B. W.; Dolphin, Andrew E.; Skillman, Evan D. +4 more
The tip of the red giant branch (TRGB) is a standardizable candle, identifiable as the discontinuity at the bright extreme of the red giant branch (RGB) stars in color–magnitude diagram space. The TRGB-based distance method has been used to measure distances to galaxies out to D ≤ 20 Mpc with the Hubble Space Telescope F814W filter, and is an impo…