Search Publications
First detection of CHD2OH towards pre-stellar cores
Caselli, P.; Spezzano, S.; Lin, Y.
The inheritance of material across the star and planet formation process is traced by deuterium fractionation. We report here the first detection of doubly deuterated methanol towards pre-stellar cores. We study the deuterium fractionation of methanol, CH3OH, towards two starless and two pre-stellar cores. We derive a D/H ratio of 0.8-1…
Measuring the Dust Attenuation Curves of SINGS/KINGFISH Galaxies Using Swift/UVOT Photometry
Gronwall, Caryl; Bowman, William P.; Decleir, Marjorie +3 more
We present Swift/Ultraviolet Optical Telescope (UVOT) integrated light photometry of the Spitzer Infrared Nearby Galaxies Survey (SINGS) and the Key Insights on Nearby Galaxies: A Far-Infrared Survey with Herschel (KINGFISH) samples of nearby galaxies. Combining the Swift/UVOT data with archival photometry, we investigate a variety of dust attenua…
Extreme Tidal Stripping May Explain the Overmassive Black Hole in Leo I: A Proof of Concept
Loeb, Abraham; Pacucci, Fabio; Ni, Yueying
A recent study found dynamical evidence of a supermassive black hole of ~3 × 106 M ⊙ at the center of Leo I, the most distant dwarf spheroidal galaxy of the Milky Way. This black hole, comparable in mass to the Milky Way's Sgr A*, places the system >2 orders of magnitude above the standard M •-M ⋆ rel…
A Combined Radio Multi-Survey Catalog of Fermi Unassociated Sources
Schinzel, F. K.; Bruzewski, S.; Taylor, G. B.
Approximately one-third of existing γ-ray sources identified by the Fermi Gamma-Ray Space Telescope are considered to be unassociated, with no known counterpart at other frequencies/wavelengths. These sources have been the subject of intense scrutiny and observational effort during the observatory's mission lifetime, and here we present a method o…
Resolving Galactic-scale Obscuration of X-Ray AGNs at z ≳ 1 with COSMOS-Web
Koekemoer, Anton M.; Gillman, Steven; Hirschmann, Michaela +25 more
A large fraction of the accreting supermassive black hole population is shrouded by copious amounts of gas and dust, particularly in the distant (z ≳ 1) universe. While much of the obscuration is attributed to a parsec-scale torus, there is a known contribution from the larger-scale host galaxy. Using JWST/NIRCam imaging from the COSMOS-Web survey…
CCD UBV and Gaia DR3 based analysis of NGC 189, NGC 1758 and NGC 7762 open clusters
Bilir, Selçuk; Yontan, Talar; Canbay, Remziye +5 more
This paper presents photometric, astrometric, and kinematic analyses of the open clusters NGC 189, NGC 1758 and NGC 7762 based on CCD UBV photometric and Gaia Data Release 3 (DR3) data. According to membership analyses, we identified 32, 57 and 106 most probable member stars with membership probabilities P ⩾ 0.5 in NGC 189, NGC 1758 and NGC 7762, …
Energy Budget in the Solar Corona
Telloni, Daniele; Zank, Gary P.; Adhikari, Laxman +34 more
This paper addresses the first direct investigation of the energy budget in the solar corona. Exploiting joint observations of the same coronal plasma by Parker Solar Probe and the Metis coronagraph aboard Solar Orbiter and the conserved equations for mass, magnetic flux, and wave action, we estimate the values of all terms comprising the total en…
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…