Search Publications
An Optical Spectrum of the Diffuse Galactic Light from BOSS and IRIS
Hensley, Brandon S.; Brandt, Timothy D.; Draine, Bruce T. +2 more
We present a spectrum of the diffuse Galactic light (DGL) between 3700 and 10,000 Å, obtained by correlating optical sky intensity with far-infrared dust emission. We use nearly 250,000 blank-sky spectra from BOSS/SDSS-III together with IRIS-reprocessed maps from the IRAS satellite. The larger sample size compared to SDSS-II results in a factor-of…
A White Dwarf-Main-sequence Binary Unveiled by Time-domain Observations from LAMOST and TESS
Liu, Jifeng; Zong, Weikai; Bai, Yu +16 more
We report a single-lined white dwarf-main-sequence binary system, LAMOST J172900.17+652952.8, which is discovered by the Large Sky Area Multi-Object Fibre Spectroscopic Telescope (LAMOST)'s medium-resolution time-domain surveys. The radial-velocity semi-amplitude and orbital period of the optical visible star are measured by using follow-up observ…
Validation and Interpretation of a Three-dimensional Configuration of a Magnetic Cloud Flux Rope
Qiu, Jiong; Hu, Qiang; Jian, Lan K. +3 more
One strong magnetic cloud (MC) with a magnetic field magnitude reaching ~40 nT at 1 au during 2012 June 16-17 is examined in association with a preexisting magnetic flux rope (MFR) identified on the Sun. The MC is characterized by a quasi-three-dimensional (3D) flux rope model based on in situ measurements from the Wind spacecraft. The contents of…
Further Evidence for the Minifilament-eruption Scenario for Solar Polar Coronal Jets
Savcheva, Antonia; Moore, Ronald L.; Savage, Sabrina L. +4 more
We examine a sampling of 23 polar-coronal-hole jets. We first identified the jets in soft X-ray (SXR) images from the X-ray telescope (XRT) on the Hinode spacecraft, over 2014-2016. During this period, frequently the polar holes were small or largely obscured by foreground coronal haze, often making jets difficult to see. We selected 23 jets among…
A Morphological Study of Galaxies Hosting Optical Variability-selected AGNs in the COSMOS Field
Inoue, Akio K.; Yamada, Toru; Zhong, Yuxing +1 more
Morphological studies are crucial to investigate the connections between active galactic nucleus (AGN) activities and the evolution of galaxies. Substantial studies have found that radiative-mode AGNs primarily reside in disk galaxies, questioning the merger-driven mechanism of AGN activities. In this study, through Sérsic profile fitting and nonp…
Testing the Potential for Radio Variability in Disks around T Tauri Stars with Observations and Chemical Modeling
Calvet, N.; D'Alessio, P.; Macías, E. +5 more
A multiwavelength observing campaign of the T Tauri star (TTS) GM Aur was undertaken in 2019 December. This campaign obtained Swift X-ray and NUV fluxes, HST NUV spectra, LCOGT ${u}^{{\prime} }> ${g}^{{\prime} }> ${r}^{{\prime} }> ${i}^{{\prime} }> and TESS photometry, CHIRON Hα spectra, Atacama Large Millimeter/submillimeter Array (AL…
Topography of the Young Galactic Disk: Spatial and Kinematic Patterns of Clustered Star Formation in the Solar Neighborhood
González, Marta; Alfaro, Emilio J.; Sánchez-Gil, M. Carmen +3 more
The accuracy in determining the spatial-kinematical parameters of open clusters makes them ideal tracers of the Galactic structure. Young open clusters (YOCs) are the main representatives of the clustered star formation mode, which identifies how most of the stars in the Galaxy form. We apply the Kriging technique to a sample of Gaia YOCs within a…
Dissecting the Extended X-Ray Emission in the Merging Pair NGC 6240: Photoionization and Winds
Elvis, M.; Fabbiano, G.; Nardini, E. +3 more
We present a detailed spectral and imaging analysis of the central 15″ radius (~7.5 kpc) region of the merger galaxy NGC 6240 that makes use of all the available Chandra-ACIS data (0.3-3 keV effective exposure of ~190 ks). This region shows extended X-ray structures with lower-energy counterparts imaged in CO, [O III], and Hα line emission. We fin…
1RXH J082623.6-505741: A New Long-period Cataclysmic Variable with an Evolved Donor and a Low Mass-transfer Rate
Strader, Jay; Bahramian, Arash; Chomiuk, Laura +13 more
We report the discovery of 1RXH J082623.6-505741, a 10.4 hr orbital period compact binary. Modeling extensive optical photometry and spectroscopy reveals a ~0.4 M ⊙ K-type secondary transferring mass through a low-state accretion disk to a nonmagnetic ~0.8 M ⊙ white dwarf. The secondary is overluminous for its mass and domina…
The Host Galaxy of the Recoiling Black Hole Candidate in 3C 186: An Old Major Merger Remnant at the Center of a z = 1 Cluster
Bianchi, S.; Macchetto, F. D.; Capetti, A. +10 more
3C 186, a radio-loud quasar at z = 1.0685, was previously reported to have both velocity and spatial offsets from its host galaxy, and has been considered as a promising candidate for a gravitational wave recoiling black hole triggered by a black hole merger. Another possible scenario is that 3C 186 is in an ongoing galaxy merger, exhibiting a tem…