Results 71 to 80 of about 1,397 (185)

Ultraviolet/Optical Emission of the Ionized Gas in AGN: Diagnostics of the Ionizing Source and Gas Properties

Frontiers in Astronomy and Space Sciences, 2017
Spectroscopic studies of active galactic nuclei (AGN) are powerful means of probing the physical properties of the ionized gas within them. In particular, near future observational facilities, such as the James Webb Space Telescope (JWST), will allow ...
Anna Feltre, Anna Feltre, Stephane Charlot, Marco Mignoli, Angela Bongiorno, Francesco Calura, Jacopo Chevallard, Emma Curtis-Lake, Roberto Gilli, Adele Plat   +9 more
doaj   +1 more source

JWST-TST DREAMS: Secondary Atmosphere Constraints for the Habitable Zone Planet TRAPPIST-1 e

The Astrophysical Journal Letters
The TRAPPIST-1 system offers one of the best opportunities to characterize temperate terrestrial planets beyond our own solar system. Within the TRAPPIST-1 system, planet e stands out as highly likely to sustain surface liquid water if it possesses an ...
Ana Glidden, Sukrit Ranjan, Sara Seager, Néstor Espinoza, Ryan J. MacDonald, Natalie H. Allen, Caleb I. Cañas, David Grant, Amélie Gressier, Kevin B. Stevenson, Natasha E. Batalha, Nikole K. Lewis, Douglas Long, Hannah R. Wakeford, Lili Alderson, Ryan C. Challener, Knicole Colón, Jingcheng Huang, Zifan Lin, Dana R. Louie, Elijah Mullens, Kristin S. Sotzen, Jeff A. Valenti, Daniel Valentine, Mark Clampin, C. Matt Mountain, Marshall Perrin, Roeland P. van der Marel   +27 more
doaj   +1 more source

On the Detection of Exorings in Reflected Light with JWST NIRCam

The Astronomical Journal
When directly imaging a cold-giant exoplanet hosting a ring system, the reflected light from the rings can outshine the planet’s thermal emission and reflected light in the near-infrared.
Rachel Bowens-Rubin, Mary Anne Limbach, Sam Hopper, Klaus Subbotina Stephenson, Matson Garza, Leigh N. Fletcher, Matthew Hedman   +6 more
doaj   +1 more source

The Perfect Host: JWST Cepheid Observations in a Background-free Type Ia Supernova Host Confirm No Bias in Hubble-constant Measurements

The Astrophysical Journal Letters
Cycle 1 JWST observations of Cepheids in Type Ia supernova (SN Ia) hosts resolved their red-giant-dominated near-infrared backgrounds, sharply reducing crowding and showing that photometric bias in lower-resolution Hubble Space Telescope (HST) data does ...
Adam G. Riess, Siyang Li, Gagandeep S. Anand, Wenlong Yuan, Louise Breuval, Stefano Casertano, Lucas M. Macri, Dan Scolnic, Yukei S. Murakami, Alexei V. Filippenko, Thomas G. Brink   +10 more
doaj   +1 more source

The James Webb Space Telescope Absolute Flux Calibration. IV. Near-Infrared Imager and Slitless Spectrograph Imaging

The Astronomical Journal
The absolute flux calibration of the Near-infrared Imager and Slitless Spectrograph (NIRISS) imaging modes is derived using observations of photometric standards with the James Webb Space Telescope (JWST).
Kevin Volk, Paul Goudfrooij
doaj   +1 more source

Deconvolution of JWST/MIRI Images: Applications to an Active Galactic Nucleus Model and GATOS Observations of NGC 5728

The Astronomical Journal
The superb image quality, stability, and sensitivity of JWST permit deconvolution techniques to be pursued with a fidelity unavailable to ground-based observations. We present an assessment of several deconvolution approaches to improve image quality and
M. T. Leist, C. Packham, D. J. V. Rosario, D. A. Hope, A. Alonso-Herrero, E. K. S. Hicks, S. Hönig, L. Zhang, R. Davies, T. Díaz-Santos, O. González-Martín, E. Bellocchi, P. G. Boorman, F. Combes, I. García-Bernete, S. García-Burillo, B. García-Lorenzo, H. Haidar, K. Ichikawa, M. Imanishi, S. M. Jefferies, Á. Labiano, N. A. Levenson, R. Nikutta, M. Pereira-Santaella, C. Ramos Almeida, C. Ricci, D. Rigopoulou, W. Schaefer, M. Stalevski, M. J. Ward, L. Fuller, T. Izumi, D. Rouan, T. Shimizu   +34 more
doaj   +1 more source

Undermassive Host Galaxies of Five z ∼ 6 Luminous Quasars Detected with JWST

The Astrophysical Journal
We measure host galaxy stellar masses for a sample of five luminous quasars at z ∼ 5–7. Using JWST/NIRCam medium-band images of nearby point-spread function reference stars, we carefully subtract the contribution from the quasar light to place upper and ...
Meredith A. Stone, Jianwei Lyu, George H. Rieke, Stacey Alberts, Kevin N. Hainline   +4 more
doaj   +1 more source

Expanding the Ice Inventory of NGC 1333 IRAS 2A with INDRA Using JWST Observations: Tracing Organic Refractories and Beyond

The Astrophysical Journal Supplement Series
In the era of the James Webb Space Telescope (JWST), with its unprecedented sensitivity and spectral resolution, infrared spectral surveys have revealed a rich inventory of ices, including complex organic molecules (COMs), in young stellar objects ...
Prathap Rayalacheruvu, Liton Majumdar, W. R. M. Rocha, Michael E. Ressler, Pabitra Ranjan Giri, S. Maitrey, Karen Willacy, D. C. Lis, Yuan Chen, P. D. Klaassen   +9 more
doaj   +1 more source

GRB 221009A: James Webb Space Telescope Observations

, 2022
We observed the afterglow of GRB 221009A (Dichiara et al., GCN 32632; Kennea & Williams, GCN 32635; Bissaldi et al., GCN 32637; Veres et al., GCN 32636) with the James Webb Space Telescope on 22 October 2022, approximately 13 days after the Fermi/GBM trigger.
Levan, A.J., Barclay, T., Burns, E., Cenko, S.B., Chrimes, A.A., D'Avanzo, P., D’Elia, V., Della Valle, M., de Ugarte Postigo, A., Fong, W., Fruchter, A.S., Gompertz, B.P., Hedges, C.L., Heintz, K.E., Izzo, L., Kann, D.A., Kennea, J.A., Floc'h, E.Le, Malesani, D.B., Melandri, A., Metzger, B.D., Mullally, S.E., Piranomonte, S., Ravasio, M.E., Racusin, J.L., Rastinejad, J.C., Salvaterra, R., Sbarufatti, B., Schneider, B., Starling, R.L.C., Tanvir, N.R., Thoene, C.C., Wijers, R.A.M.J., Xu, D.   +33 more
openaire   +1 more source

A Comparison of One-dimensional and Three-dimensional Exoplanet Atmosphere Model Grids: ScCHIMERA and the SPARC/MiTgcm

The Astrophysical Journal
Inferring the properties of transiting exoplanet atmospheres relies on comparing models to spectroscopic observations. Atmosphere models, however, make a range of assumptions, from one-dimensional (1D, varying with altitude) radiative-convective ...
Lindsey S. Wiser, Alexander Roth, Vivien Parmentier, Michael R. Line   +3 more
doaj   +1 more source