Search Publications
Exploring the Origin of Multiwavelength Activities of High-redshift Flat-spectrum Radio Quasar PKS 1502+106 during 2014-2018
Wang, X. Y.; Gu, Q. S.; Xiong, Ding-Rong +4 more
The origin of the multiband activities (outbursts/flares) of blazars is still a heavily debated topic. Shock and magnetic reconnection have long been considered as possible triggers of the multiband activities. In this paper, we present an exploration of the origin of multiband activities for a high-redshift (z = 1.8385) flat-spectrum radio quasar…
Unresolved Binaries and Galactic Clusters’ Mass Estimates
Carraro, Giovanni; Borodina, Olga I.; Seleznev, Anton F. +1 more
Binary stars are present in all stellar systems, yet their role is far from being fully understood. We investigate the effect of unresolved binaries in the derivation of open clusters’ mass by star counts. We start from the luminosity functions of five open clusters: IC 2714, NGC 1912, NGC 2099, NGC 6834, and NGC 7142. Luminosity functions are obt…
NuSTAR Observations of the Supernova Remnant RX J1713.7-3946
Uchiyama, Yasunobu; Tanaka, Takaaki; Aharonian, Felix +4 more
The shock waves of supernova remnants (SNRs) are prominent candidates for the acceleration of the Galactic cosmic rays. SNR RX J1713.7-3946 is one well-studied particle accelerator in our Galaxy because of its strong nonthermal X-ray and gamma-ray radiation. We have performed Nuclear Spectroscopic Telescope Array (3-79 keV) observations of the nor…
Properties of Density and Velocity Gaps Induced by a Planet in a Protoplanetary Disk
Han, Cheongho; Bae, Jaehan; Kim, Woong-Tae +1 more
Gravitational interactions between a protoplanetary disk and its embedded planet are one of the formation mechanisms of gaps and rings found in recent ALMA observations. To quantify the gap properties measured in not only surface density but also rotational velocity profiles, we run two-dimensional hydrodynamic simulations of protoplanetary disks …
Observations of Type Ia Supernova 2014J for Nearly 900 Days and Constraints on Its Progenitor System
Wang, Lifan; Elias-Rosa, Nancy; Benetti, Stefano +18 more
We present extensive ground-based and Hubble Space Telescope (HST) photometry of the highly reddened, very nearby SN Ia 2014J in M82, covering the phases from 9 days before to about 900 days after the B-band maximum. SN 2014J is similar to other normal SNe Ia near the maximum light, but it shows flux excess in the B band in the early nebular phase…
The Inner Disk and Accretion Flow of the Close Binary DQ Tau
Gutermuth, Robert; Muzerolle, James; Flaherty, Kevin +2 more
We present multiepoch optical and near-infrared (NIR) photometry and spectroscopy of the spectroscopic binary T Tauri star DQ Tau. The photometric monitoring, obtained using SMARTS ANDICAM, recovers the previously seen correlation between optical flux and the 15.8 day binary orbital period, with blue flux peaks occurring close to most observed per…
The OSIRIS Lens-amplified Survey (OLAS). I. Dynamical Effects of Stellar Feedback in Low-mass Galaxies at z ∼ 2
Treu, Tommaso; Bradač, Maruša; Wang, Xin +6 more
We introduce the OSIRIS Lens-Amplified Survey (OLAS), a kinematic survey of gravitationally lensed galaxies at cosmic noon taken with Keck adaptive optics. In this paper, we present spatially resolved spectroscopy and nebular emission kinematic maps for 17 star-forming galaxies with stellar masses 8 < log(M */M ⊙) < 9.8…
Compton-thick AGNs in the NuSTAR Era. V. Joint NuSTAR and XMM-Newton Spectral Analysis of Three “Soft-gamma” Candidate CT-AGNs in the Swift/BAT 100-month Catalog
Comastri, A.; Ajello, M.; La Parola, V. +3 more
We present the joint NuSTAR and XMM-Newton spectral analysis in the 0.6-70 keV band of three candidate Compton-thick (CT-) active galactic nuclei (AGNs) selected in the 100-month Swift-BAT catalog. These objects were previously classified as CT-AGNs based on low-quality Swift-X-ray Telescope (XRT) and Swift-Burst Alert Telescope (BAT) data, and ha…
The Warm Gaseous Disk and the Anisotropic Circumgalactic Medium of the Milky Way
Bregman, Joel N.; Qu, Zhijie
Warm ({log}T≈ 5) gas is an important gaseous component in the galaxy baryonic cycle, which is important for understanding both gas accretion and galactic feedback processes. We built a two-dimensional disk-circumgalactic medium (CGM) model to study the warm gas distribution of the Milky Way (MW) using the absorption-line surveys of Si IV and O VI.…
Photometric Determination of the Mass Accretion Rates of Pre-main-sequence Stars. VI. The Case of LH 95 in the Large Magellanic Cloud
Panagia, Nino; Beccari, Giacomo; De Marchi, Guido +1 more
We report on the accretion properties of low-mass stars in the LH 95 association within the Large Magellanic Cloud. Using noncontemporaneous wideband optical and narrowband Hα photometry obtained with the Hubble Space Telescope, we identify 245 low-mass pre-main-sequence (PMS) candidates showing Hα excess emission above the 4σ level. We derive the…