Search Publications
Unveiling the Formation of the Massive DR21 Ridge
Schneider, N.; Csengeri, T.; Bontemps, S. +10 more
We present new 13CO (1-0), C18O (1-0), HCO+ (1-0), and H13CO+ (1-0) maps from the IRAM 30 m telescope and a spectrally resolved [C II] 158 µm map observed with the SOFIA telescope toward the massive DR21 cloud. This traces the kinematics from low- to high-density gas in the cloud, which …
300: An ACA 870 µm Continuum Survey of Orion Protostars and Their Evolution
Narang, Mayank; Pokhrel, Riwaj; Fischer, William J. +11 more
We present an 870 µm continuum survey of 300 protostars from the Herschel Orion Protostar Survey using the Atacama Compact Array (ACA). These data measure protostellar flux densities on envelope scales ≤8000 au (20″) and resolve the structure of envelopes with 1600 au (4″) resolution, a factor of 3-5 improvement in angular resolution over ex…
The Oceanus Moving Group: A New 500 Myr Old Host for the Nearest Brown Dwarf
Kiman, Rocio; Faherty, Jacqueline K.; Gagné, Jonathan +5 more
We report the discovery of the Oceanus moving group, a ≈500 Myr old group with 50 members and candidate members at distances 2-50 pc from the Sun, using an unsupervised clustering analysis of nearby stars with Gaia DR3 data. This new moving group includes the nearest brown dwarf WISE J104915.57-531906.1 AB (Luhman 16 AB) at a distance of 2 pc, whi…
A Glimpse of the Stellar Populations and Elemental Abundances of Gravitationally Lensed, Quiescent Galaxies at z ≳ 1 with Keck Deep Spectroscopy
Allen, Rebecca J.; Kacprzak, Glenn G.; Glazebrook, Karl +13 more
Gravitational lenses can magnify distant galaxies, allowing us to discover and characterize the stellar populations of intrinsically faint, quiescent galaxies that are otherwise extremely difficult to directly observe at high redshift from ground-based telescopes. Here, we present the spectral analysis of two lensed, quiescent galaxies at z ≳ 1 di…
Evidence for a Low Lyman Continuum Escape Fraction in Three Massive, Ultraviolet-bright Galaxies at z > 7
Laporte, Nicolas; Katz, Harley; Witten, Callum E. C.
Although low-mass star-forming galaxies are the leading candidates of the reionization process, we cannot conclusively rule out high-mass star-forming galaxies as candidates. While most simulations indicate the former is the best candidate, some models suggest that at z ≥ 6 massive, UV-bright galaxies - "oligarchs" - account for at least 80% of th…
Discovery of a Variable Multiphase Outflow in the X-Ray-emitting Tidal Disruption Event ASASSN-20qc
Tombesi, F.; Kara, E.; Pasham, D. +1 more
Tidal disruption events (TDEs) are exotic transients that can lead to temporary super-Eddington accretion onto a supermassive black hole. Such an accretion mode is naturally expected to result in powerful outflows of ionized matter. However, to date such an outflow has only been directly detected in the X-ray band in a single TDE, ASASSN-14li. Thi…
Hypervelocity Stars Track Back to the Galactic Center in Gaia DR3
Shi, Jianrong; Ma, Jun; Du, Cuihua +2 more
Based on the proper motions and radial velocities from Gaia Data Release 3, we identify two hypervelocity stars (HVSs) that may originate from the Galactic center (GC). We select the candidates by first filtering for all Gaia stars with Galactocentric radial velocities >500 km s-1. We also require the candidates cross the Galactic mi…
B-fields and Dust in Interstellar Filaments Using Dust Polarization (BALLAD-POL). I. The Massive Filament G11.11-0.12 Observed by SOFIA/HAWC+
Diep, Pham Ngoc; Hoang, Thiem; Ngoc, Nguyen Bich +8 more
We report the first measurement of polarized thermal dust emission toward the entire infrared dark cloud G11.11-0.12 taken by the polarimeter SOFIA/HAWC+ at 214 µm. The obtained magnetic fields (B-fields) from the polarized emission of the early-stage and massive filament tend to be perpendicular to its spine. We produce a map of B-field str…
Origin and Extent of the Opacity Challenge for Atmospheric Retrievals of WASP-39 b
de Wit, Julien; Niraula, Prajwal; Gordon, Iouli E. +2 more
As the James Webb Space Telescope (JWST) came online last summer, we entered a new era of astronomy. This new era is supported by data products of unprecedented information content that require novel reduction and analysis techniques. Recently, Niraula et al. (N22) highlighted the need for upgraded opacity models to prevent facing a model-driven a…
Spatial and Binary Parameter Distributions of Black Hole Binaries in the Milky Way Detectable with Gaia
Shikauchi, Minori; Tanikawa, Ataru; Tsuna, Daichi +1 more
Soon after Gaia Data Release 3 (DR3) in 2022 June, some candidates (and one confirmed) of detached black hole (BH)-luminous companion (LC) binaries have been reported. Existing and future detections of astrometric BH-LC binaries will shed light on the spatial distribution of these systems, which can deepen our understanding of the natal kicks and …