Results 61 to 70 of about 4,545 (163)

A Spectroscopic Analysis of the Ionizing Photon Production Efficiency in JADES and CEERS: Implications for the Ionizing Photon Budget

The Astrophysical Journal
We have used a combined sample of JADES and CEERS objects in order to constrain ionizing photon production efficiency ( ξ _ion ) from JWST/NIRSpec and JWST/NIRCam data. We examine 163 objects at 1.06 
Anthony Pahl, Michael W. Topping, Alice Shapley, Ryan Sanders, Naveen A. Reddy, Leonardo Clarke, Emily Kehoe, Trinity Bento, Gabe Brammer   +8 more
doaj   +1 more source

Zonal Winds in Titan’s Middle Atmosphere from a Stellar Occultation Observed with Keck Adaptive Optics

The Planetary Science Journal
We present spatially resolved Keck/NIRC2 images of a stellar occultation by Titan on 2022 September 5 and compare them to predictions from concurrent Atacama Large Millimeter/submillimeter Array (ALMA) observations and a suite of general circulation ...
Theresa C. Marlin, Eliot F. Young, Katherine de Kleer, Martin Cordiner, Nicholas A. Lombardo, Imke de Pater, Juan M. Lora, Paul Corlies, Richard Cosentino, Conor Nixon, Sébastien Rodriguez, Alexander Thelen   +11 more
doaj   +1 more source

A Near-infrared Search for Helium in the Superluminous Supernova SN 2024ahr

The Astrophysical Journal
We present a detailed study of SN 2024ahr, a hydrogen-poor superluminous supernova (SLSN-I), for which we determine a redshift of z = 0.0861. SN 2024ahr has a peak absolute magnitude of M _g ≈ M _r ≈ −21 mag, rest-frame rise and decline times (50% of ...
Harsh Kumar, Edo Berger, Peter K. Blanchard, Sebastian Gomez, Daichi Hiramatsu, Moira Andrews, K. Azalee Bostroem, Yize Dong, Joseph Farah, Estefania Padilla Gonzalez, D. Andrew Howell, Curtis McCully, Darshana Mehta, Megan Newsome, Aravind P. Ravi, Giacomo Terreran   +15 more
doaj   +1 more source

SALT's Venture into Near Infrared Astronomy with RSS-NIR [PDF]

Proceedings of SALT Science Conference 2015 — PoS(SSC2015), 2016
openaire   +1 more source

A Detection of Helium in the Bright Superluminous Supernova SN 2024rmj

The Astrophysical Journal
We present extensive ultraviolet, optical, and near-infrared (NIR) photometric and spectroscopic observations of the nearby hydrogen-poor superluminous supernova (SLSN-I) SN 2024rmj at z = 0.1189.
Harsh Kumar, Edo Berger, Peter K. Blanchard, Daichi Hiramatsu, Sebastian Gomez, Alex Gagliano, Moira Andrews, K. Azalee Bostroem, Joseph Farah, D. Andrew Howell, Curtis McCully   +10 more
doaj   +1 more source

Lyα Profile Shape as an Escape-fraction Diagnostic at High Redshift

The Astrophysical Journal
While the shape of the Ly α profile is viewed as one of the best tracers of ionizing-photon escape fraction ( f _esc ) within low-redshift ( z ∼ 0.3) surveys of the Lyman continuum, this connection remains untested at high redshift. Here, we combine deep,
Anthony Pahl, Alice Shapley, Charles C. Steidel, Naveen A. Reddy, Yuguang Chen, Gwen C. Rudie   +5 more
doaj   +1 more source

A Formally Motivated Retrieval Framework Applied to the High-resolution Transmission Spectrum of HD 189733 b

The Astronomical Journal
Ground-based high-resolution spectra provide a powerful tool for characterizing exoplanet atmospheres. However, they are greatly hampered by the dominating telluric and stellar lines, which need to be removed prior to any analysis.
Doriann Blain, Alejandro Sánchez-López, Paul Mollière   +2 more
doaj   +1 more source

Surveying the Giant H ii Regions of the Milky Way with SOFIA. VIII. W43 Main

The Astrophysical Journal
In this eighth paper of the Stratospheric Observatory For Infrared Astronomy-FORCAST series on Milky Way GH ii regions, we present an analysis of the massive star-forming complex W43 Main.
James M. De Buizer, Wanggi Lim, James T. Radomski, Nicole Karnath   +3 more
doaj   +1 more source

The [Fe xiii] Infrared 10747 and 10798 Å Lines in Novae

The Astrophysical Journal
The forbidden lines of [Fe xiii ] at 10747 and 10798 Å are among the most prominent lines in the near-infrared spectrum of the solar corona. They have been used routinely, both outside and during eclipses, as sensitive probes of the electron density and ...
D. P. K. Banerjee, C. E. Woodward, A. Evans, T. R. Geballe, V. Joshi, S. Starrfield   +5 more
doaj   +1 more source

Development of near infrared and visible MKIDs (Microwave Kinetic Inductance Detectors) for astronomy.

, 2019
KIDs (Microwave Kinetic Inductance Detectors) by their ability to count photons, to measure their individual energies and to acquire images at very high rates are likely to allow an observational revolution in the visible and near infrared. A MKID detector is basically an LC superconducting resonator whose intrinsic resonance frequency is fixed by the ...
openaire   +1 more source