Search Publications
No Small-scale Radio Jets Here: Multiepoch Observations of Radio Continuum Structures in NGC 1068 with the VLBA
Fischer, Travis C.; Secrest, Nathan J.; Crenshaw, D. Michael +2 more
We present recent Very Long Baseline Array (VLBA) 5 GHz radio observations of the nearby, luminous Seyfert 2 galaxy NGC 1068 for comparison to similar VLBA observations made on 1997 April 26. By cross-correlating the positions of emitting regions across both epochs, we find that spatially resolved extranuclear radio knots in this system have subre…
Sodium Brightening of (3200) Phaethon near Perihelion
Zhang, Qicheng; Knight, Matthew M.; Battams, Karl +2 more
Sunskirting asteroid (3200) Phaethon has been repeatedly observed in Solar Terrestrial Relations Observatory (STEREO) Heliospheric Imager 1 (HI1) imagery to anomalously brighten and produce an antisunward tail for a few days near each perihelion passage, phenomena previously attributed to the ejection of micron-sized dust grains. Color imaging by …
Analysing the SEDs of protoplanetary disks with machine learning
Pinte, C.; Woitke, P.; Kamp, I. +2 more
Context. The analysis of spectral energy distributions (SEDs) of protoplanetary disks to determine their physical properties is known to be highly degenerate. Hence, a full Bayesian analysis is required to obtain parameter uncertainties and degeneracies. The main challenge here is computational speed, as one proper full radiative transfer model re…
Contamination in TESS Light Curves: The Case of the Fast Yellow Pulsating Supergiants
Bell, Keaton J.; Pedersen, May G.
Given its large plate scale of 21″ pixel-1, analyses of data from the Transiting Exoplanet Survey Satellite (TESS) space telescope must be wary of source confusion from blended light curves, which creates the potential to attribute observed photometric variability to the wrong astrophysical source. We explore the impact of light curve c…
Hidden Cooling Flows in clusters of Galaxies II: a wider sample
Fabian, A. C.; Pinto, C.; Ferland, G. J. +3 more
We have recently uncovered Hidden Cooling Flows (HCFs) in the XMM Reflection Grating Spectrometer spectra of three clusters of galaxies; Centaurus, Perseus, and A1835. Here, we search for them in a wider sample of objects: the X-ray brightest group NGC 5044; four moderate X-ray luminosity clusters Sersic 159, A262, A2052, and RX J0821; and three h…
Detection of Carbon Monoxide's 4.6 Micron Fundamental Band Structure in WASP-39b's Atmosphere with JWST NIRSpec G395H
Mikal-Evans, Thomas; Stevenson, Kevin B.; Kirk, James +29 more
Carbon monoxide (CO) is predicted to be the dominant carbon-bearing molecule in giant planet atmospheres and, along with water, is important for discerning the oxygen and therefore carbon-to-oxygen ratio of these planets. The fundamental absorption mode of CO has a broad, double-branched structure composed of many individual absorption lines from …
The Imprint of Clump Formation at High Redshift. II. The Chemistry of the Bulge
Fisher, Deanne B.; Nidever, David L.; Valenti, Elena +11 more
In Paper I, we showed that clumps in high-redshift galaxies, having a high star formation rate density (ΣSFR), produce disks with two tracks in the [Fe/H]-[α/Fe] chemical space, similar to that of the Milky Way's (MW's) thin+thick disks. Here we investigate the effect of clumps on the bulge's chemistry. The chemistry of the MW's bulge i…
A Southern Photometric Quasar Catalog from the Dark Energy Survey Data Release 2
Shen, Yue; Yang, Qian
We present a catalog of 1.4 million photometrically selected quasar candidates in the southern hemisphere over the ~5000 deg2 Dark Energy Survey (DES) wide survey area. We combine optical photometry from the DES second data release (DR2) with available near-infrared (NIR) and the all-sky unWISE mid-infrared photometry in the selection. …
The Stellar Mass-Black Hole Mass Relation at z 2 down to {{M }}_{\mathrm{BH}}∼ {10}(7} {M) _{⊙ } Determined by HETDEX
Ono, Yoshiaki; Ouchi, Masami; Finkelstein, Steven L. +14 more
We investigate the stellar mass-black hole mass ( ${{ \mathcal M }}_{* }\mbox{--}{{ \mathcal M }}_{\mathrm{BH}}$ ) relation with type 1 active galactic nuclei (AGNs) down to ${{ \mathcal M }}_{\mathrm{BH}}={10}^{7\,}{M}_{\odot }$ , corresponding to a ≃ -21 absolute magnitude in rest-frame ultraviolet, at z = 2-2.5. Exploiting the deep and large-ar…
ED-2: A cold but not so narrow stellar stream crossing the solar neighbourhood
Helmi, A.; Balbinot, E.; Ruiz-Lara, T. +3 more
Context. ED-2 is a stellar stream identified as a compact group in integrals-of-motion space in a local sample of halo stars from the third Gaia data release.
Aims: We investigate its nature and possible association with known halo substructures.
Methods: We explored the current properties of ED-2 members in phase-space and also analysed…