Search Publications
GALFIT-ing AGN Host Galaxies in COSMOS: HST versus Subaru
Gallagher, Sarah C.; Urry, C. Megan; Barmby, Pauline +3 more
The COSMOS field has been extensively observed by most major telescopes, including Chandra, HST, and Subaru. HST imaging boasts very high spatial resolution and is used extensively in morphological studies of distant galaxies. Subaru provides lower spatial resolution imaging than HST but a substantially wider field of view with greater sensitivity…
RNO 54: A Previously Unappreciated FU Ori Star
De, Kishalay; van Roestel, Jan; Hillenbrand, Lynne A. +1 more
We present evidence in support of the hypothesis that the young stellar object RNO 54 is a mature-stage FU Ori type source. The star was first cataloged as a "red nebulous object" in the 1980s but appears to have undergone its outburst prior to the 1890s. Present-day optical and near-infrared spectra are consistent with those of other FU Ori-type …
Deciphering Faint Gyrosynchrotron Emission from a Coronal Mass Ejection Using Spectropolarimetric Radio Imaging
Mondal, Surajit; Oberoi, Divya; Kansabanik, Devojyoti
Measurements of the plasma parameters of coronal mass ejections (CMEs), particularly the magnetic field and nonthermal electron population entrained in the CME plasma, are crucial to understand their propagation, evolution, and geo-effectiveness. Spectral modeling of gyrosynchrotron (GS) emission from CME plasma has been regarded as one of the mos…
A Need to Revise Stellar Opacities from Asteroseismology of δ Scuti Stars
Walczak, Przemysław; Daszyńska-Daszkiewicz, Jadwiga; Pamyatnykh, Alexey +2 more
We construct seismic models of the four double-mode radial δ Scuti stars adopting opacities from three databases: OPAL, OP, and OPLIB. The aim is to find the models that fit the observed frequencies of the two radial modes and have the effective temperature and luminosity consistent with the observed values. Using the Bayesian analysis based on Mo…
The Accretion History of AGN: The Spectral Energy Distributions of X-Ray-luminous Active Galactic Nuclei
Kirkpatrick, Allison; Koss, Michael; Boquien, Médéric +17 more
Spectral energy distributions (SEDs) from X-ray to far-infrared (FIR) wavelengths are presented for a sample of 1246 X-ray-luminous active galactic nuclei (AGNs; L 0.5-10 keV > 1043 erg s-1), with z spec < 1.2, selected from Stripe 82X, COSMOS, and GOODS-N/S. The rest-frame SEDs show a wide spread …
Interactions between the Jet and Disk Wind in Nearby Radio-intermediate Quasar III Zw 2
An, Tao; Baan, Willem A.; Mohan, Prashanth +13 more
Disk winds and jets are ubiquitous in active galactic nuclei (AGN), and how these two components interact remains an open question. We study the radio properties of the radio-intermediate quasar III Zw 2. We detect two jet knots, J1 and J2, on parsec scales that move at a mildly apparent superluminal speed of 1.35c. Two γ-ray flares were detected …
Testing the Collisionless Nature of Dark Matter with the Radial Acceleration Relation in Galaxy Clusters
Umetsu, Keiichi; Robertson, Andrew; Tam, Sut-Ieng +1 more
The radial acceleration relation (RAR) represents a tight empirical relation between the inferred total and baryonic centripetal accelerations, g tot = GM tot(< r)/r 2 and g bar = GM bar(< r)/r 2, observed in galaxies and galaxy clusters. The tight correlation between these tw…
JWST Imaging of the Cartwheel Galaxy Reveals Dust Associated with SN 2021afdx
Shivaei, Irene; Sand, David J.; Terreran, Giacomo +12 more
We present near- and mid-infrared (0.9-18 µm) photometry of supernova (SN) 2021afdx, which was imaged serendipitously with the James Webb Space Telescope (JWST) as part of its Early Release Observations of the Cartwheel Galaxy. Our ground-based optical observations show it is likely to be a Type IIb SN, the explosion of a yellow supergiant, …
Electromagnetic Characterization of the LISA Verification Binary ZTF J0526+5934
Bergeron, P.; Kupfer, Thomas; Kosakowski, Alekzander +1 more
We present an analysis of new and archival data to the 20.506 minute LISA verification binary J052610.42+593445.32 (J0526+5934). Our joint spectroscopic and photometric analysis finds that the binary contains an unseen M 1 = 0.89 ± 0.11 M ⊙ CO-core white dwarf primary with an M 2 = 0.38 ± 0.07 M ⊙ post-c…
Lyman Continuum Emission from Spectroscopically Confirmed Lyα Emitters at z 3.1
Jiang, Linhua; Zheng, Zhen-Ya; Windhorst, Rogier A. +2 more
We present a study of Lyman continuum (LyC) emission in a sample of ~150 Lyα emitters (LAEs) at z ≈ 3.1 in the Subaru-XMM Deep Survey field. These LAEs were previously selected using the narrowband technique and spectroscopically confirmed with Lyα equivalent widths (EWs) ≥ 45 Å. We obtain deep UV images using a custom intermediate-band filter U <…