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Clustering with JWST: Constraining galaxy host halo masses, satellite quenching efficiencies, and merger rates at z = 4-10
Stark, Daniel P.; Endsley, Ryan; Rieke, Marcia +5 more
Galaxy clustering measurements can be used to constrain many aspects of galaxy evolution, including galaxy host halo masses, satellite quenching efficiencies, and merger rates. We simulate JWST galaxy clustering measurements at z ∼ 4-10 by utilizing mock galaxy samples produced by an empirical model, the UNIVERSEMACHINE. We also adopt the survey f…
Separation between RR Lyrae and type II Cepheids and their importance for a distance determination: the case of omega Cen
Salaris, M.; Mateo, M.; Marinoni, S. +11 more
The separation between RR Lyrae (RRLs) and type II Cepheid (T2Cs) variables based on their period is debated. Both types of variable stars are distance indicators, and we aim to promote the use of T2Cs as distance indicators in synergy with RRLs. We adopted new and existing optical and near-infrared (NIR) photometry of ω Cen to investigate several…
The Spectroscopic Follow-up of the QUBRICS Bright Quasar Survey
Grazian, Andrea; Boutsia, Konstantina; Amorin, Ricardo +11 more
We present the results of the spectroscopic follow-up of the QUasars as BRIght beacons for Cosmology in the Southern Hemisphere (QUBRICS; Calderone et al. 2019) survey. The selection method is based on a machine-learning approach applied to photometric catalogs, covering an area of ∼12,400 deg2 in the Southern Hemisphere. The spectrosco…
Forward Modeling of Double Neutron Stars: Insights from Highly Offset Short Gamma-Ray Bursts
Fong, Wen-fai; Zevin, Michael; Kalogera, Vicky +3 more
We present a detailed analysis of two well-localized, highly offset short gamma-ray bursts—GRB 070809 and GRB 090515—investigating the kinematic evolution of their progenitors from compact object formation until merger. Calibrating to observations of their most probable host galaxies, we construct semi-analytic galactic models that account for sta…
Application of an X-Ray Clumpy Torus Model (XCLUMPY) to 10 Obscured Active Galactic Nuclei Observed with Suzaku and NuSTAR
Tanimoto, Atsushi; Ueda, Yoshihiro; Odaka, Hirokazu +4 more
We apply XCLUMPY, an X-ray spectral model from a clumpy torus in an active galactic nucleus (AGN), to the broadband X-ray spectra of 10 obscured AGNs observed with both Suzaku and NuSTAR. The infrared spectra of these AGNs were analyzed by Ichikawa et al. with the CLUMPY code. Because XCLUMPY adopts the same clump distribution as that in the CLUMP…
WASP-117 b: An Eccentric Hot Saturn as a Future Complex Chemistry Laboratory
Changeat, Quentin; Venot, Olivia; Edwards, Billy +4 more
We present spectral analysis of the transiting Saturn-mass planet WASP-117 b, observed with the G141 grism of the Hubble Space Telescope's (HST) Wide Field Camera 3. We reduce and fit the extracted spectrum from the raw transmission data using the open-source software Iraclis before performing a fully Bayesian retrieval using the publicly availabl…
The Effect of Solar Wind Expansion and Nonequilibrium Ionization on the Broadening of Coronal Emission Lines
Cranmer, Steven R.; Gilly, Chris R.
When observing spectral lines in the optically thin corona, line-of-sight (LOS) effects can strongly affect the interpretation of the data, especially in regions just above the limb. We present a semiempirical forward model, called the Global Heliospheric Optically thin Spectral Transport Simulation (GHOSTS), to characterize these effects. GHOSTS …
Identification of a Group III CEMP-no Star in the Dwarf Spheroidal Galaxy Canes Venatici I
Yoon, Jinmi; Whitten, Devin D.; Beers, Timothy C. +3 more
CEMP-no stars, a subclass of carbon-enhanced metal-poor (CEMP) stars, are one of the most significant stellar populations in galactic archeology, because they dominate the low end of the metallicity distribution function, providing information on the early star formation and chemical-evolution history of the Milky Way and its satellite galaxies. H…
Open clusters as tracers on radial migration of the galactic disc
Zhao, G.; Chen, Y. Q.
Radial migration is an important process in the Galactic disc. A few open clusters show some evidence on this mechanism but there is no systematic study. In this work, we investigate the role of radial migration on the Galactic disc based on a large sample of 146 open clusters with homogeneous metallicity and age from Netopil et al. and kinematics…
Modeling the Accretion Disk around the High-mass Protostar GGD 27-MM1
Galván-Madrid, R.; Osorio, M.; Fernández-López, M. +9 more
Recent high angular resolution (≃40 mas) ALMA observations at 1.14 mm resolve a compact (R ≃ 200 au), flattened dust structure perpendicular to the HH 80-81 jet emanating from the GGD 27-MM1 high-mass protostar, making it a robust candidate for a true accretion disk. The jet-disk system (HH 80-81/GGD 27-MM1) resembles those found in association wi…