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Surface and interior meridional circulation in the Sun
Hanasoge, Shravan M.
Solar meridional circulation is an axisymmetric flow system, extending from the equator to the poles (
The AGEL Survey: Spectroscopic Confirmation of Strong Gravitational Lenses in the DES and DECaLS Fields Selected Using Convolutional Neural Networks
Kewley, Lisa J.; Harshan, Anishya; Kacprzak, Glenn G. +13 more
We present spectroscopic confirmation of candidate strong gravitational lenses using the Keck Observatory and Very Large Telescope as part of our ASTRO 3D Galaxy Evolution with Lenses (AGEL) survey. We confirm that (1) search methods using convolutional neural networks (CNNs) with visual inspection successfully identify strong gravitational lenses…
A New Iron Emission Template for Active Galactic Nuclei. I. Optical Template for the Hβ Region
Laor, Ari; Ho, Luis C.; Barth, Aaron J. +1 more
We present a new empirical template for iron emission in active galactic nuclei (AGNs) covering the 4000-5600 Å range. The new template is based on a spectrum of the narrow-line Seyfert 1 galaxy Mrk 493 obtained with the Hubble Space Telescope. In comparison with the canonical iron template object I Zw 1, Mrk 493 has narrower broad-line widths, lo…
Cleaning Our Hazy Lens: Exploring Trends in Transmission Spectra of Warm Exoplanets
Fortney, Jonathan J.; Zhang, Xi; Thorngren, Daniel +4 more
Relatively little is understood about the atmospheric composition of temperate to warm exoplanets (equilibrium temperature T eq < 1000 K), as many of them are found to have uncharacteristically flat transmission spectra. Their flattened spectra are likely due to atmospheric opacity sources such as planet-wide photochemical hazes and …
From Naked Spheroids to Disky Galaxies: How Do Massive Disk Galaxies Shape Their Morphology?
Barro, Guillermo; Pérez-González, Pablo G.; Costantin, Luca +9 more
We investigate the assembly history of massive disk galaxies and describe how they shape their morphology through cosmic time. Using SHARDS and HST data, we modeled the surface brightness distribution of 91 massive galaxies at redshift 0.14 < z ≤ 1 in the wavelength range 0.5-1.6 µm, deriving the uncontaminated spectral energy distributio…
Modelling the water and carbon dioxide production rates of Comet 67P/Churyumov-Gerasimenko
Samarasinha, Nalin H.; Farnocchia, Davide; Gutiérrez, Pedro J. +1 more
The European Space Agency Rosetta/Philae mission to Comet 67P/Churyumov-Gerasimenko in 2014-2016 is the most complete and diverse investigation of a comet carried out thus far. Yet, many physical and chemical properties of the comet remain uncertain or unknown, and cometary activity is still not a well-understood phenomenon. We here attempt to pla…
The chemical composition of globular clusters in the Local Group
Larsen, S. S.; Strader, J.; Bergemann, M. +5 more
We present detailed chemical abundance measurements for 45 globular clusters (GCs) associated with galaxies in (and, in one case, beyond) the Local Group. The measurements are based on new high-resolution integrated-light spectra of GCs in the galaxies NGC 185, NGC 205, M 31, M 33, and NGC 2403, combined with reanalysis of previously published obs…
About Metallicity Variations in the Local Galactic Interstellar Medium
Méndez-Delgado, J. E.; Arellano-Córdova, K. Z.; García-Rojas, J. +1 more
In this paper we discuss and confront recent results on metallicity variations in the local interstellar medium, obtained from observations of H II regions and neutral clouds of the Galactic thin disk, and compare them with recent high-quality metallicity determinations of other tracers of the chemical composition of the interstellar medium as B-t…
Measurements of the Hubble Constant with a Two-rung Distance Ladder: Two Out of Three Ain't Bad
Casertano, Stefano; Jones, David O.; Riess, Adam G. +7 more
The three-rung distance ladder, which calibrates Type Ia supernovae (SNe Ia) through stellar distances linked to geometric measurements, provides the highest precision direct measurement of the Hubble constant. In light of the Hubble tension, it is important to test the individual components of the distance ladder. For this purpose, we report a me…
New LZ and PW(Z) relations of RR Lyrae stars calibrated with Gaia EDR3 parallaxes
Sarro, L. M.; Clementini, G.; Ripepi, V. +4 more
We present new luminosity-metallicity (LZ; $M_{V}\!-\!\rm [Fe/H]$ and $M_{G}\!-\!\rm [Fe/H]$) relations and, for the first time, empirical, Gaia three-band (G, GBP, GRP) period-Wesenheit-metallicity (PWZ) relations of RR Lyrae stars (RRLs) derived using a hierarchical Bayesian approach and new accurate parallaxes published fo…