Search Publications
The Hα and [O III] λ5007 Luminosity Functions of 1.2 < z < 1.9 Emission-line Galaxies from Hubble Space Telescope (HST) Grism Spectroscopy
Gronwall, Caryl; Ciardullo, Robin; Bowman, William P. +2 more
Euclid and the Roman Space Telescope (Roman) will soon use grism spectroscopy to detect millions of galaxies via their Hα and [O III] λ5007 emission. To better constrain the expected galaxy counts from these instruments, we use a vetted sample of 4239 emission-line galaxies from the 3D Hubble Space Telescope survey to measure the Hα and [O III] λ5…
The Deformation of an Erupting Magnetic Flux Rope in a Confined Solar Flare
Liu, Yang; Zhang, Liang; Chen, Yao +7 more
Magnetic flux ropes (MFRs), sets of coherently twisted magnetic field lines, are believed as core structures of various solar eruptions. Their evolution plays an important role to understand the physical mechanisms of solar eruptions, and can shed light on adverse space weather near the Earth. However, the erupting MFRs are occasionally prevented …
Observations of Mini Coronal Dimmings Caused by Small-scale Eruptions in the Quiet Sun
Wang, Rui; Liu, Ying D.; Hu, Huidong +1 more
Small-scale eruptions could play an important role in coronal heating, generation of solar energetic particles (SEPs), and mass source of the solar wind. However, they are poorly observed, and their characteristics, distributions, and origins remain unclear. Here a mini coronal dimming was captured by the recently launched Solar Orbiter spacecraft…
NuSTAR Observations of Four Mid-IR-Selected Dual AGN Candidates in Galaxy Mergers
Ricci, Claudio; Blecha, Laura; Satyapal, Shobita +5 more
Mergers of galaxies are a ubiquitous phenomenon in the universe and represent a natural consequence of the "bottom-up" mass accumulation and galaxy evolution cosmological paradigm. It is generally accepted that the peak of active galactic nucleus (AGN) accretion activity occurs at nuclear separations of ≲10 kpc for major mergers. Here we present n…
TESS Asteroseismic Analysis of HD 76920: The Giant Star Hosting an Extremely Eccentric Exoplanet
Li, Yaguang; Chaplin, William J.; Kane, Stephen R. +30 more
The Transiting Exoplanet Survey Satellite (TESS) mission searches for new exoplanets. The observing strategy of TESS results in high-precision photometry of millions of stars across the sky, allowing for detailed asteroseismic studies of individual systems. In this work, we present a detailed asteroseismic analysis of the giant star HD 76920 hosti…
The Origin of Extremely Nonradial Solar Wind Outflows
Janardhan, P.; Chakrabarty, D.; Fujiki, K. +2 more
The origin of nonradial solar wind flows and their effect on space weather are poorly understood. Here we present a detailed investigation of 12 nonradial solar wind events during solar cycles 23-24, covering the period 1995-2017. In all these events the azimuthal flow angles of the solar wind exceed 6° as measured at the L1 Lagrangian point of th…
Large Photospheric Doppler Shift in Solar Active Region 12673. I. Field-aligned Flows
Sun, Xudong; Welsch, Brian T.; Quintero Noda, C. +3 more
Delta (δ) sunspots sometimes host fast photospheric flows along the central magnetic polarity inversion line (PIL). Here we study the strong Doppler shift signature in the central penumbral light bridge of solar active region NOAA 12673. Observations from the Helioseismic and Magnetic Imager (HMI) indicate highly sheared and strong magnetic fields…
Outlier Detection in the DESI Bright Galaxy Survey
Melchior, Peter; Ward, Charlotte; Goulding, Andy +3 more
We present an unsupervised search for outliers in the Bright Galaxy Survey (BGS) data set from the DESI Early Data Release. This analysis utilizes an autoencoder to compress galaxy spectra into a compact, redshift-invariant latent space, and a normalizing flow to identify low-probability objects. The most prominent outliers show distinctive spectr…
Shocks and Photoionization of the Inner 650 au Jet of the Interacting Binary Star R Aquarii from Multiwavelength Hubble Space Telescope Observations
Montez, Rodolfo; Raymond, John C.; Karovska, Margarita +3 more
Astrophysical jets are present in a range of environments, including young stellar objects, X-ray binaries, and active galactic nuclei, but their formation is still not fully understood. As one of the nearest symbiotic binary stars, R Aquarii (D ~ 220 pc) offers a unique opportunity to study the inner region within ~600 au of the jet source, which…
A Dwarf Galaxy Debris Stream Associated with Palomar 1 and the Anticenter Stream
Tan, Ke-Feng; Zhao, Gang; Zhao, Jing-Kun +2 more
We report the discovery of a new stream (dubbed as Yangtze) detected in Gaia Data Release 3. The stream is at a heliocentric distance of ~9.12 kpc and spans nearly 27° by 1.°9 on the sky. The color-magnitude diagram of Yangtze indicates a stellar population of age ~11 Gyr and [M/H] ~ -0.7 dex. It has a number density of about 5.5 stars deg-2<…