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A JWST Near- and Mid-infrared Nebular Spectrum of the Type Ia Supernova 2021aefx
Temim, Tea; Foley, Ryan J.; Rest, Armin +55 more
We present JWST near-infrared (NIR) and mid-infrared (MIR) spectroscopic observations of the nearby normal Type Ia supernova (SN) SN 2021aefx in the nebular phase at +255 days past maximum light. Our Near Infrared Spectrograph (NIRSpec) and Mid Infrared Instrument observations, combined with ground-based optical data from the South African Large T…
CLASSY VII Lyα Profiles: The Structure and Kinematics of Neutral Gas and Implications for LyC Escape in Reionization-era Analogs
Martin, Crystal L.; Brinchmann, Jarle; Kumari, Nimisha +23 more
Lyα line profiles are a powerful probe of interstellar medium (ISM) structure, outflow speed, and Lyman-continuum escape fraction. In this paper, we present the Lyα line profiles of the Cosmic Origins Spectrograph (COS) Legacy Archive Spectroscopic SurveY, a sample rich in spectroscopic analogs of reionization-era galaxies. A large fraction of the…
Characterizing the Near-infrared Spectra of Flares from TRAPPIST-1 during JWST Transit Spectroscopy Observations
Kowalski, Adam F.; Espinoza, Néstor; MacGregor, Meredith A. +16 more
We present the first analysis of JWST near-infrared spectroscopy of stellar flares from TRAPPIST-1 during transits of rocky exoplanets. Four flares were observed from 0.6-2.8 µm with the Near Infrared Imager and Slitless Spectrograph and 0.6-3.5 µm with the Near Infrared Spectrograph during transits of TRAPPIST-1b, f, and g. We discove…
ALMA-IMF. VI. Investigating the origin of stellar masses: Core mass function evolution in the W43-MM2&MM3 mini-starburst
Galván-Madrid, R.; Cunningham, N.; Schneider, N. +35 more
Context. Among the most central open questions regarding the initial mass function (IMF) of stars is the impact of environment on the shape of the core mass function (CMF) and thus potentially on the IMF.
Aims: The ALMA-IMF Large Program aims to investigate the variations in the core distributions (CMF and mass segregation) with cloud charact…
The B & V light curves for recurrent nova T CrB from 1842-2022, the unique pre- and post-eruption high-states, the complex period changes, and the upcoming eruption in 2025.5 ± 1.3
Schaefer, Bradley E.
T CrB is one of the most-famous and brightest novae known, and is a recurrent nova with prior eruptions in 1866 and 1946 that peak at V = 2.0. I have constructed light curves spanning 1842-2022 with 213 730 magnitudes, where the B and V magnitudes are fully corrected to the Johnson system. These light curves first reveal a unique complex high-stat…
Dark matter halo cores and the tidal survival of Milky Way satellites
Navarro, Julio F.; Errani, Raphaël; Peñarrubia, Jorge +2 more
The cuspy central density profiles of cold dark matter (CDM) haloes make them highly resilient to disruption by tides. Self-interactions between dark matter particles, or the cycling of baryons, may result in the formation of a constant-density core that would make haloes more susceptible to tidal disruption. We use N-body simulations to study the…
Quasar UV/X-ray relation luminosity distances are shorter than reverberation-measured radius-luminosity relation luminosity distances
Zajaček, Michal; Czerny, Bożena; Khadka, Narayan +5 more
We use measurements of 59/58 quasars (QSOs), over a redshift range 0.0041 ≤ z ≤ 1.686, to do a comparative study of the radius-luminosity (R - L) and X-ray-UV luminosity (LX - LUV) relations and the implication of these relations for cosmological parameter estimation. By simultaneously determining R - L or LX - L
Chandra, HST/STIS, NICER, Swift, and TESS Detail the Flare Evolution of the Repeating Nuclear Transient ASASSN -14ko
Holoien, Thomas W. -S.; Vallely, Patrick J.; Auchettl, Katie +9 more
ASASSN-14ko is a nuclear transient at the center of the AGN ESO 253-G003 that undergoes periodic flares. Optical flares were first observed in 2014 by the All-Sky Automated Survey for Supernovae (ASAS-SN) and their peak times are well-modeled with a period of ${115.2}_{-1.2}^{+1.3}$ days and period derivative of -0.0026 ± 0.0006. Here we present A…
Bright submillimeter galaxies do trace galaxy protoclusters
Dannerbauer, Helmut; Calvi, Rosa; Castignani, Gianluca
There is controversy in the literature regarding whether distant, massive, and dusty starbursts selected at (sub)millimeter wavelengths can trace galaxy overdensities. We thus performed the first systematic search for distant protoclusters around a homogeneously selected sample of 12 spectroscopically confirmed submillimeter galaxies (SMGs) at z ∼…
Inspiraling streams of enriched gas observed around a massive galaxy 11 billion years ago
Fan, Xiaohui; Cai, Zheng; Li, Qiong +19 more
Stars form in galaxies, from gas that has been accreted from the intergalactic medium. Simulations have shown that recycling of gas—the reaccretion of gas that was previously ejected from a galaxy—could sustain star formation in the early Universe. We observe the gas surrounding a massive galaxy at redshift 2.3 and detect emission lines from neutr…