Search Publications
An Extensive Hubble Space Telescope Study of the Offset and Host Light Distributions of Type I Superluminous Supernovae
Berger, Edo; Gomez, Sebastian; Blanchard, Peter K. +1 more
We present an extensive Hubble Space Telescope rest-frame UV imaging study of the locations of Type I superluminous supernovae (SLSNe) within their host galaxies. The sample includes 65 SLSNe with detected host galaxies in the redshift range z ≈ 0.05–2. Using precise astrometric matching with SN images, we determine the distributions of the physic…
AGN STORM 2. V. Anomalous Behavior of the C IV Light Curve of Mrk 817
Treu, Tommaso; Kaspi, Shai; Hall, Patrick B. +49 more
An intensive reverberation mapping campaign of the Seyfert 1 galaxy Mrk 817 using the Cosmic Origins Spectrograph on the Hubble Space Telescope revealed significant variations in the response of broad UV emission lines to fluctuations in the continuum emission. The response of the prominent UV emission lines changes over an ∼60 day duration, resul…
Nine lensed quasars and quasar pairs discovered through spatially extended variability in Pan-STARRS
Anguita, Timo; Courbin, Frédéric; Hempel, Angela +7 more
We present the proof of concept of a method for finding strongly lensed quasars using their spatially extended photometric variability through difference imaging in cadenced imaging survey data. We applied the method to Pan-STARRS, starting with an initial selection of 14 107 Gaia multiplets with quasar-like infrared colours from WISE. We identifi…
The Lyα Nondetection by JWST NIRSpec of a Strong Lyα Emitter at z = 5.66 Confirmed by MUSE
Kong, Xu; Cheng, Cheng; Boyett, Kristan +6 more
The detections of Lyα emission in galaxies with redshifts above 5 are of utmost importance for constraining the cosmic reionization timeline, yet such detections are usually based on slit spectroscopy. Here we investigate the significant bias induced by slit placement on the estimate of Lyα escape fraction (
Refining Galactic primordial black hole evaporation constraints
Balaji, Shyam; Koechler, Jordan; Luque, Pedro De la Torre
We revisit the role of primordial black holes (PBHs) as potential dark matter (DM) candidates, particularly focusing on light asteroid-mass PBHs. These PBHs are expected to emit particles through Hawking evaporation that can generate cosmic rays (CRs), eventually producing other secondary radiations through their propagation in the Milky Way, in a…
A second view on the X-ray polarization of NGC 4151 with IXPE
Bianchi, S.; Done, C.; Petrucci, P. -O. +21 more
We report on the second observing program of the active galactic nucleus NGC 4151 with simultaneous Imaging X-ray Polarimetry Explorer (IXPE; 750 ks), NuSTAR (∼60 ks), XMM-Newton (∼75 ks), and NICER (∼65 ks) pointings. NGC 4151 is the first Type-1 radio-quiet Seyfert galaxy with constrained polarization properties for the X-ray corona. Despite the…
Systematic KMTNet Planetary Anomaly Search. X. Complete Sample of 2017 Prime-field Planets
Han, Cheongho; Udalski, Andrzej; Lee, Chung-Uk +42 more
We complete the analysis of planetary candidates found by the KMT AnomalyFinder for the 2017 prime fields that cover ∼13 deg2. We report three unambiguous planets: OGLE-2017-BLG-0640, OGLE-2017-BLG-1275, and OGLE-2017-BLG-1237. The first two of these were not previously identified, while the last was not previously published due to tech…
Two successive EUV waves and a transverse oscillation of a quiescent prominence
Li, Y.; Yan, X. L.; Zhang, Q. M. +4 more
In this paper, we carry out multiwavelength observations of two successive extreme-ultraviolet (EUV) waves originating from active region (AR) NOAA 13575 and a transverse oscillation of a columnar quiescent prominence on 2024 February 9. A hot channel eruption generates an X3.4 class flare and the associated full-halo coronal mass ejection (CME), …
Evidence for Primordial Alignment: Insights from Stellar Obliquity Measurements for Compact Sub-Saturn Systems
Rice, Malena; Wang, Songhu; Wang, Xian-Yu +5 more
Despite decades of effort, the mechanisms by which the spin axis of a star and the orbital axes of its planets become misaligned remain elusive. In particular, it is of great interest whether the large spin–orbit misalignments observed are driven primarily by high-eccentricity migration—expected to have occurred for short-period, isolated planets—…
Structure formation with primordial black holes to alleviate early star formation tension revealed by JWST
Padilla, N.; Colazo, P. E.; Stasyszyn, F.
Context. This Letter explores the potential role of primordial black holes (PBHs) to address cosmological tensions as the presence of more massive than expected galaxies at high redshifts, as indicated by recent James Webb Space Telescope observations.
Aims: Motivated by inflation models that enhance the power at scales beyond the observable …