Search Publications
The Evolution of Far-infrared CO Emission from Protostars
Henning, T.; Manoj, P.; Megeath, S. T. +7 more
We investigate the evolution of far-IR CO emission from protostars observed with Herschel/PACS for 50 sources from the combined sample of HOPS and DIGIT Herschel key programs. From the uniformly sampled spectral energy distributions, whose peaks are well sampled, we computed the {L}{bol}, {T}{bol}, and {L}{bol}/{L}…
The Geometry of the Infrared and X-Ray Obscurer in a Dusty Hyperluminous Quasar
Brandt, William N.; Koss, Michael; Ricci, Claudio +24 more
We study the geometry of the active galactic nucleus (AGN) obscurer in IRAS 09104+4109, an IR-luminous, radio-intermediate FR-I source at z = 0.442, using infrared data from Spitzer and Herschel, X-ray data from NuSTAR, Swift, Suzaku, and Chandra, and an optical spectrum from Palomar. The infrared data imply a total rest-frame 1-1000 µm lumi…
Ordinary X-Rays from Three Extraordinary Millisecond Pulsars: XMM-Newton Observations of PSRs J0337+1715, J0636+5129, and J0645+5158
Kaplan, David L.; Stairs, Ingrid; Spiewak, Renée +8 more
We present the first X-ray observations of three recently discovered millisecond pulsars (MSPs) with interesting characteristics: PSR J0337+1715, PSR J0636+5129, and PSR J0645+5158. PSR J0337+1715 is a fast-spinning, bright, and so-far unique MSP in a hierarchical triple system with two white dwarf companions. PSR J0636+5129 is an MSP in a very ti…
The Wide-angle Outflow of the Lensed z = 1.51 AGN HS 0810+2554
Cappi, M.; Chartas, G.; Giustini, M. +4 more
We present results from X-ray observations of the gravitationally lensed z = 1.51 active galactic nucleus (AGN) HS 0810+2554 performed with the Chandra X-ray Observatory and XMM-Newton. Blueshifted absorption lines are detected in both observations at rest-frame energies ranging between ∼1 and 12 keV at ≳99% confidence. The inferred velocities of …
Photometric and Astrometric Vagaries of the Enigma Star KIC 8462852
Makarov, Valeri V.; Goldin, Alexey
We apply a principal component analysis (PCA)-based pre-whitening method to the entire collection of main Kepler mission long-cadence data for KIC 8462852 spanning four years. This technique removes the correlated variations of instrumental origin in both the detected light curves and astrometry, resolving intrinsic changes in flux and image posit…
Far Infrared Variability of Sagittarius A*: 25.5 hr of Monitoring with Herschel
Heinke, C. O.; Dowell, C. D.; Schulz, B. +3 more
Variable emission from Sgr A*, the luminous counterpart to the super-massive black hole at the center of our Galaxy, arises from the innermost portions of the accretion flow. Better characterization of the variability is important for constraining models of the low-luminosity accretion mode powering Sgr A*, and could further our ability to use var…
New Debris Disks in Nearby Young Moving Groups
Ábrahám, P.; Kóspál, Á.; Henning, Th. +5 more
A significant fraction of nearby young moving group members harbor circumstellar debris dust disks. Due to their proximity and youth, these disks are attractive targets for studying the early evolution of debris dust and planetesimal belts. Here we present 70 and 160 µm observations of 31 systems in the β Pic moving group, and in the Tucana-…
Determining Type Ia Supernova Host Galaxy Extinction Probabilities and a Statistical Approach to Estimating the Absorption-to-reddening Ratio RV
Marleau, Francine; Deustua, Susana; Cikota, Aleksandar
We investigate limits on the extinction values of Type Ia supernovae (SNe Ia) to statistically determine the most probable color excess, E(B - V), with galactocentric distance, and use these statistics to determine the absorption-to-reddening ratio, RV, for dust in the host galaxies. We determined pixel-based dust mass surface density m…
The Circum-Galactic Medium of MASsive Spirals. I. An Overview and a Case Study of NGC 5908
Bregman, Joel N.; Anderson, Michael E.; Crain, Robert A. +2 more
The Circum-Galactic Medium of MASsive Spirals is a project studying the overall content, physical and chemical properties, and spatial distributions of the multi-phase circumgalactic medium around a small sample of the most massive ({M}* ≳ 2× {10}11 {M}⊙ , {v}{rot}\gt 300 {km} {{{s}}}-1) isola…
GeMS/GSAOI Photometric and Astrometric Performance in Dense Stellar Fields
Dalessandro, E.; Saracino, S.; Marchetti, E. +7 more
Ground-based imagers at 8 m class telescopes assisted by multi-conjugate adaptive optics are primary facilities with which to obtain accurate photometry and proper motions in dense stellar fields. We observed the central region of the globular clusters Liller 1 and NGC 6624 with the Gemini Multi-conjugate Adaptive Optics System (GeMS) feeding the …