Search Publications
Radiative Driving of the AGN Outflows in the Narrow-line Seyfert 1 Galaxy NGC 4051
Fischer, Travis C.; Crenshaw, D. Michael; Schmitt, Henrique R. +5 more
We explore the properties of ionized gas in the nuclear and circumnuclear environment of the narrow-line Seyfert 1 galaxy NGC 4051 using spectroscopic and imaging observations from the Hubble Space Telescope (HST) and Apache Point Observatory's ARC 3.5 m Telescope. We identify an unresolved moderate-density intermediate-width component and a high-…
Detecting Biosignatures in the Atmospheres of Gas Dwarf Planets with the James Webb Space Telescope
Kendrew, Sarah; Hu, Renyu; Valenti, Jeff +5 more
Exoplanets with radii between those of Earth and Neptune have stronger surface gravity than Earth, and can retain a sizable hydrogen-dominated atmosphere. In contrast to gas giant planets, we call these planets gas dwarf planets. The James Webb Space Telescope (JWST) will offer unprecedented insight into these planets. Here, we investigate the det…
Stellar Spins in the Pleiades, Praesepe, and M35 Open Clusters
Schlaufman, Kevin C.; Healy, Brian F.; McCullough, P. R.
We analyze spectroscopic and photometric data to determine the projected inclinations of stars in three open clusters: the Pleiades, Praesepe, and M35. We determine the $\sin i$ values of 42, 35, and 67 stars in each cluster, respectively, and from their distributions we find that isotropic spins and moderate alignment are both consistent with the…
The Consistency of Chemical Clocks among Coeval Stars
Jofré, Paula; Chanamé, Julio; Casamiquela, Laia +1 more
The abundance ratios of some chemical species have been found to correlate with stellar age, leading to the possibility of using stellar atmospheric abundances as stellar age indicators. These chemical clocks have already been calibrated with solar twins and open clusters, but it remains to be seen whether they can be effective at identifying coev…
Source-dependent Properties of Two Slow Solar Wind States
Moncuquet, Michel; Issautier, Karine; Poirier, Nicolas +3 more
Two states of the slow solar wind are identified from in situ measurements by the Parker Solar Probe (PSP) inside 50 solar radii from the Sun. At such distances the wind measured by PSP has not yet undergone significant transformation related to the expansion and propagation of the wind. We focus in this study on the properties of the quiet solar …
Probing Intra-Halo Light with Galaxy Stacking in CIBER Images
Cooray, Asantha; Matsuura, Shuji; Zemcov, Michael +13 more
We study the stellar halos of 0.2 ≲ z ≲ 0.5 galaxies with stellar masses spanning M* ~ 1010.5 to 1012M⊙ (approximately L* galaxies at this redshift) using imaging data from the Cosmic Infrared Background Experiment (CIBER). A previous CIBER fluctuation analysis suggested that intra-halo light …
Tracing the Milky Way's Vestigial Nuclear Jet
Bland-Hawthorn, Joss; Mukherjee, Dipanjan; Wagner, Alexander Y. +2 more
MeerKAT radio continuum and XMM-Newton X-ray images have recently revealed a spectacular bipolar channel at the Galactic Center that spans several degrees (~0.5 kpc). An intermittent jet likely formed this channel and is consistent with earlier evidence of a sustained, Seyfert-level outburst fueled by black hole accretion onto Sgr A* several Myr a…
Calibrating X-Ray Binary Luminosity Functions via Optical Reconnaissance. I. The Case of M83
Chandar, Rupali; Mok, Angus; Gallo, Elena +4 more
Building on recent work by Chandar et al., we construct X-ray luminosity functions (XLFs) for different classes of X-ray binary (XRB) donors in the nearby star-forming galaxy M83 through a novel methodology. Rather than classifying low- versus high-mass XRBs based on the scaling of the number of X-ray sources with stellar mass and star formation r…
StrayCats: A Catalog of NuSTAR Stray Light Observations
Hare, Jeremy; García, Javier A.; Madsen, Kristin K. +10 more
We present StrayCats, a catalog of NuSTAR stray light observations of X-ray sources. Stray light observations arise for sources 1°-4° away from the telescope pointing direction. At this off-axis angle, X-rays pass through a gap between the optics and aperture stop and so do not interact with the X-ray optics; instead, they directly illuminate the …
The JCMT BISTRO Survey: Evidence for Pinched Magnetic Fields in Quiescent Filaments of NGC 1333
Pattle, Kate; Ward-Thompson, Derek; Bastien, Pierre +33 more
We investigate the internal 3D magnetic structure of dense interstellar filaments within NGC 1333 using polarization data at 850 µm from the B-fields In STar-forming Region Observations survey at the James Clerk Maxwell Telescope. Theoretical models predict that the magnetic field lines in a filament will tend to be dragged radially inward (…