Results 81 to 90 of about 826 (184)

Stellar Populations with MaNGA: Iron Kink and Nitrogen Fuzz

The Astrophysical Journal
Recent analysis of 2968 MaNGA early-type galaxies has yielded two notable trends with velocity dispersion ( σ ) not previously discussed in the literature. First, Fe abundance rises with σ but only until σ  ≈ 100 km s ^−1 , after which it falls.
Guy Worthey, Tathagata Pal
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Terrestrial Analogs to Titan for Geophysical Research

Reviews of Geophysics, Volume 64, Issue 2, June 2026.
Abstract Saturn's moon Titan exhibits remarkable parallels to the Earth in many geophysical and geological processes not found elsewhere in the solar system at the present day. These include a nitrogen atmosphere with a condensible gas—methane—replacing the Earth's water, leading to an active meteorology with rainfall and surface manifestations ...
Conor A. Nixon, Samuel Birch, Audrey Chatain, Charles Cockell, Kendra K. Farnsworth, Peter M. Higgins, Stéphane Le Mouélic, Rosaly M. C. Lopes, Michael J. Malaska, Mohit Melwani Daswani, Kelly E. Miller, Catherine D. Neish, Olaf G. Podlaha, Jani Radebaugh, Lauren R. Schurmeier, Ashley Schoenfeld, Krista M. Soderlund, Anezina Solomonidou, Christophe Sotin, Nicholas A. Teanby, Tetsuya Tokano, Steven D. Vance   +21 more
wiley   +1 more source

Finding Massive Double-exponential Disk Galaxies with Extended Low Surface Brightness Stellar Disk: An IllustrisTNG Exploration

The Astrophysical Journal
We study massive disk galaxies (stellar mass > = 10 ^11 M _⊙ ) at z = 0 from IllustrisTNG simulation to detect galaxies that contain two exponential stellar disks—a central high surface brightness (HSB) disk surrounded by an extended low surface ...
Suchira Sarkar, Kanak Saha
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Constraints on the Lyman Continuum Escape from Low-mass Lensed Galaxies at 1.3 ≤ z ≤ 3.0

The Astrophysical Journal
Low-mass galaxies can significantly contribute to reionization due to their potentially high Lyman continuum (LyC) escape fraction and relatively high space density. We present a constraint on the LyC escape fraction from low-mass galaxies at z = 1.3–3.0.
Intae Jung, Henry C. Ferguson, Matthew J. Hayes, Alaina Henry, Anne E. Jaskot, Daniel Schaerer, Keren Sharon, Ricardo O. Amorín, Hakim Atek, Matthew B. Bayliss, Håkon Dahle, Steven L. Finkelstein, Andrea Grazian, Lucia Guaita, Göran Östlin, Laura Pentericci, Swara Ravindranath, Claudia Scarlata, Harry I. Teplitz, Anne Verhamme   +19 more
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Hubble Space Telescope Imaging of Three Isolated Faint Dwarf Galaxies beyond the Local Group: Pavo, Corvus A, and Kamino

The Astrophysical Journal
We present new Hubble Space Telescope (HST) imaging of three recently discovered star-forming dwarf galaxies beyond the Local Group: Pavo, Corvus A, and Kamino. The discovery of Kamino is reported here for the first time.
Burçin Mutlu-Pakdil, Michael G. Jones, David J. Sand, Denija Crnojević, Kai Herron, Jay Strader, Dennis Zaritsky, Paul Bennet, Alex Drlica-Wagner, Quinn O. Casey, Amandine Doliva-Dolinsky, Richard Donnerstein, Catherine E. Fielder, Laura C. Hunter, Annika H. G. Peter, Deepthi S. Prabhu, Kristine Spekkens   +16 more
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Resolved Near-infrared Stellar Photometry from the Magellan Telescope for 13 Nearby Galaxies: J-region Asymptotic Giant Branch Method Distances

The Astrophysical Journal
We present near-infrared JHK photometry for the resolved stellar populations in 13 nearby galaxies: NGC 6822, IC 1613, NGC 3109, Sextans B, Sextans A, NGC 300, NGC 55, NGC 7793, NGC 247, NGC 5253, Cen A, NGC 1313, and M83, acquired from the 6.5 m Baade ...
Abigail J. Lee, Andrew J. Monson, Wendy L. Freedman, Barry F. Madore, Kayla A. Owens, Rachael L. Beaton, Coral Espinoza, Tongtian Ren, Yi Ren   +8 more
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The Tip of Red Giant Branch Distances to Nearby Dwarf Galaxies WLM and Sextans A with JWST

The Astrophysical Journal
Distance measurements to extragalactic systems that are both accurate and precise are cornerstones of modern astrophysics, underpinning the calibration of standard candles and the determination of the Hubble constant.
Ziming Yan, Shu Wang, Xiaodian Chen, Licai Deng   +3 more
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Carbon and Iron Deficiencies in Quiescent Galaxies at z = 1–3 from JWST-SUSPENSE: Implications for the Formation Histories of Massive Galaxies

The Astrophysical Journal
We present the stellar metallicities and multielement abundances (C, Mg, Si, Ca, Ti, Cr, and Fe) of 15 massive (log M / M _⊙ = 10.2–11.2) quiescent galaxies at z = 1–3, derived from ultradeep JWST-SUSPENSE spectra. Compared to quiescent galaxies at z ∼ 0,
Aliza G. Beverage, Martje Slob, Mariska Kriek, Charlie Conroy, Guillermo Barro, Rachel Bezanson, Gabriel Brammer, Chloe M. Cheng, Anna de Graaff, Natascha M. Förster Schreiber, Marijn Franx, Brian Lorenz, Pavel E. Mancera Piña, Danilo Marchesini, Adam Muzzin, Andrew B. Newman, Sedona H. Price, Alice E. Shapley, Mauro Stefanon, Katherine A. Suess, Pieter van Dokkum, David Weinberg, Daniel R. Weisz   +22 more
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FEAST: JWST/NIRCam View of the Resolved Stellar Populations of the Interacting Dwarf Galaxies NGC 4485 and NGC 4490

The Astrophysical Journal
We present new JWST/NIRCam observations of the interacting dwarf galaxy system NGC 4485–NGC 4490 (aka Arp 269), obtained as part of the Cycle 1 Feedback in Emerging Extragalactic Star Clusters (FEAST) program. NGC 4485 and NGC 4490 form the closest known
Giacomo Bortolini, Matteo Correnti, Angela Adamo, Michele Cignoni, Elena Sacchi, Monica Tosi, Göran Östlin, Anastasios Kapodistrias, Arjan Bik, Daniela Calzetti, Ana Duarte-Cabral, Flavia Dell’Agli, John S. Gallagher, Benjamin Gregg, Kathryn Grasha, Thomas S.-Y. Lai, Drew Lapeer, Sean T. Linden, Matteo Messa, Alex Pedrini, Elena Sabbi, Linda J. Smith, Helena Faustino Vieira, John M. Cannon, Salvador Duarte Puertas, Carmelle Robert   +25 more
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The Complex Upper HR Diagram—Redux: The Low-Metallicity Galaxies

Universe
The properties of luminous evolved stars in nearby resolved galaxies are briefly reviewed with emphasis on recent results for the low-metallicity dwarf irregulars.
Roberta M. Humphreys
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