Search Publications
Missions
Journals
Publication Years
CEERS: Spatially Resolved UV and Mid-infrared Star Formation in Galaxies at 0.2 < z < 2.5: The Picture from the Hubble and James Webb Space Telescopes
Papovich, Casey; Yang, Guang; Finkelstein, Steven L. +38 more
We present the mid-infrared (MIR) morphologies for 64 star-forming galaxies (SFGs) at 0.2 < z < 2.5 with stellar mass M * > 109 M ⊙ using James Webb Space Telescope (JWST) Mid-Infrared Instrument (MIRI) observations from the Cosmic Evolution Early Release Science survey. The MIRI bands span the MIR (7.7-21…
X-Ray Polarization of the BL Lacertae Type Blazar 1ES 0229+200
Kaaret, Philip; Wu, Kinwah; Enoto, Teruaki +111 more
We present polarization measurements in the 2-8 keV band from blazar 1ES 0229+200, the first extreme high synchrotron peaked source to be observed by the Imaging X-ray Polarimetry Explorer (IXPE). Combining two exposures separated by about two weeks, we find the degree of polarization to be ΠX = 17.9% ± 2.8% at an electric-vector positi…
Pegasus W: An Ultrafaint Dwarf Galaxy Outside the Halo of M31 Not Quenched by Reionization
McQuinn, Kristen B. W.; Dolphin, Andrew E.; Cohen, Roger E. +3 more
We report the discovery of an ultrafaint dwarf (UFD) galaxy, Pegasus W, located on the far side of the Milky Way-M31 system and outside the virial radius of M31. The distance to the galaxy is ${915}_{-91}^{+60}$ kpc, measured using the luminosity of horizontal branch stars identified in Hubble Space Telescope optical imaging. The galaxy has a half…
The stellar halo in Local Group Hestia simulations. I. The in situ component and the effect of mergers
Vogelsberger, Mark; Steinmetz, Matthias; Grand, Robert J. J. +12 more
Theory suggests that mergers play an important role in shaping galactic discs and stellar haloes, which was observationally confirmed in the Milky Way (MW) thanks to Gaia data. In this work, aiming to probe the contribution of mergers to the in situ stellar halo formation, we analyse six M 31 and MW analogues from the HESTIA suite of cosmological …
Do Central Compact Objects have Carbon Atmospheres?
Halpern, J. P.; Alford, J. A. J.
Only three of the dozen central compact objects (CCOs) in supernova remnants (SNRs) show thermal X-ray pulsations due to nonuniform surface temperature (hot spots). The absence of X-ray pulsations from several unpulsed CCOs has motivated suggestions that they have uniform-temperature carbon atmospheres (UTCAs), which adequately fit their spectra w…
V-LoTSS: The circularly polarised LOFAR Two-metre Sky Survey
White, G. J.; Bomans, D. J.; Ray, T. P. +44 more
We present the detection of 68 sources from the most sensitive radio survey in circular polarisation conducted to date. We used the second data release of the 144 MHz LOFAR Two-metre Sky Survey to produce circularly polarised maps with a median noise of 140 µJy beam−1 and resolution of 20″ for ≈27% of the northern sky (5634 deg2
PHANGS-JWST First Results: The 21 µm Compact Source Population
Sandstrom, Karin M.; Kruijssen, J. M. Diederik; Leroy, Adam K. +24 more
We use PHANGS-James Webb Space Telescope (JWST) data to identify and classify 1271 compact 21 µm sources in four nearby galaxies using MIRI F2100W data. We identify sources using a dendrogram-based algorithm, and we measure the background-subtracted flux densities for JWST bands from 2 to 21 µm. Using the spectral energy distribution (…
Giant tidal tails of helium escaping the hot Jupiter HAT-P-32 b
Vanderburg, Andrew; Cochran, William D.; Endl, Michael +14 more
Capturing planets in the act of losing their atmospheres provides rare opportunities to probe their evolution history. This analysis has been enabled by observations of the helium triplet at 10,833 angstrom, but past studies have focused on the narrow time window right around the planet's optical transit. We monitored the hot Jupiter HAT-P-32 b us…
Spectroscopic identification of water emission from a main-belt comet
Villanueva, Geronimo L.; Bodewits, Dennis; Hsieh, Henry H. +4 more
Main-belt comets are small Solar System bodies located in the asteroid belt that repeatedly exhibit comet-like activity (that is, dust comae or tails) during their perihelion passages, strongly indicating ice sublimation1,2. Although the existence of main-belt comets implies the presence of extant water ice in the asteroid belt, no gas …
PHANGS-JWST First Results: The Influence of Stellar Clusters on Polycyclic Aromatic Hydrocarbons in Nearby Galaxies
Kruijssen, J. M. Diederik; Leroy, Adam K.; Rosolowsky, Erik +28 more
We present a comparison of theoretical predictions of dust continuum and polycyclic aromatic hydrocarbon (PAH) emission with new JWST observations in three nearby galaxies: NGC 628, NGC 1365, and NGC 7496. Our analysis focuses on a total of 1063 compact stellar clusters and 2654 stellar associations previously characterized by the Hubble Space Tel…