Search Publications
Calibrating C-IV-based Black Hole Mass Estimators
Park, Daeseong; Denney, Kelly D.; Woo, Jong-Hak +1 more
We present the single-epoch black hole mass estimators based on the C IV λ1549 broad emission line, using the updated sample of the reverberation-mapped active galactic nuclei and high-quality UV spectra. By performing multi-component spectral fitting analysis, we measure the C IV line widths (FWHMC IV and line dispersion, σC IV <…
The NuSTAR Extragalactic Survey: A First Sensitive Look at the High-energy Cosmic X-Ray Background Population
Harrison, F. A.; Stern, D.; Zhang, W. W. +31 more
We report on the first 10 identifications of sources serendipitously detected by the Nuclear Spectroscopic Telescope Array (NuSTAR) to provide the first sensitive census of the cosmic X-ray background source population at >~ 10 keV. We find that these NuSTAR-detected sources are ≈100 times fainter than those previously detected at >~ 10 keV …
Azimuthal Density Variations around the Rim of Tycho's Supernova Remnant
Petre, Robert; Reynolds, Stephen P.; Ghavamian, Parviz +5 more
Spitzer images of Tycho's supernova remnant in the mid-infrared reveal limb-brightened emission from the entire periphery of the shell and faint filamentary structures in the interior. As with other young remnants, this emission is produced by dust grains, warmed to ~100 K in the post-shock environment by collisions with energetic electrons and io…
Low & high scale MSSM inflation, gravitational waves and constraints from Planck
Choudhury, Sayantan; Mazumdar, Anupam; Pal, Supratik
In this paper we will analyze generic predictions of an inflection-point model of inflation with Hubble-induced corrections and study them in light of the Planck data. Typically inflection-point models of inflation can be embedded within Minimal Supersymmetric Standard Model (MSSM) where inflation can occur below the Planck scale. The flexibility …
Planck intermediate results. III. The relation between galaxy cluster mass and Sunyaev-Zeldovich signal
Böhringer, H.; Kneissl, R.; Dahle, H. +183 more
We examine the relation between the galaxy cluster mass M and Sunyaev-Zeldovich (SZ) effect signal DA2 Y500 for a sample of 19 objects for which weak lensing (WL) mass measurements obtained from Subaru Telescope data are available in the literature. Hydrostatic X-ray masses are derived from XMM-Newton archive data,…
Caught in the Act: The Assembly of Massive Cluster Galaxies at z = 1.62
Papovich, Casey; Ferguson, Henry C.; Koekemoer, Anton M. +13 more
We present the recent merger history of massive galaxies in a spectroscopically confirmed proto-cluster at z = 1.62. Using Hubble Space Telescope WFC3 near-infrared imaging from the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey, we select cluster and z ~ 1.6 field galaxies with M star >= 3 × 1010 M ⊙<…
Interaction of substorm injections with the subauroral geospace: 1. Multispacecraft observations of SAID
Mishin, Evgeny V.
Subauroral ion drifts (SAID) are the prominent feature of the active subauroral geospace, just earthward of the electron plasma sheet (PS) boundary in the premidnight sector. We explore magnetically conjugate satellite observations of substorm SAID near the magnetic equator and in the topside ionosphere confirming and expanding on our previous res…
An interferometric study of the Fomalhaut inner debris disk. III. Detailed models of the exozodiacal disk and its origin
Absil, O.; Augereau, J. -C.; Ertel, S. +15 more
Context. Debris disks are thought to be extrasolar analogs to the solar system planetesimal belts. The star Fomalhaut harbors a cold debris belt at 140 AU comparable to the Edgeworth-Kuiper belt, as well as evidence of a warm dust component, unresolved by single-dish telescopes, which is suspected of being a bright analog to the solar system's zod…
Galaxy Zoo: bulgeless galaxies with growing black holes
Moran, Edward C.; Schawinski, Kevin; Kaviraj, Sugata +8 more
The growth of supermassive black holes appears to be driven by galaxy mergers, violent merger-free processes and/or `secular' processes. In order to quantify the effects of secular evolution on black hole growth, we study a sample of active galactic nuclei (AGN) in galaxies with a calm formation history free of significant mergers, a population th…
Observational signatures of anisotropic inflationary models
Ohashi, Junko; Tsujikawa, Shinji; Soda, Jiro
We study observational signatures of two classes of anisotropic inflationary models in which an inflaton field couples to (i) a vector kinetic term FµνFµν and (ii) a two-form kinetic term HµνλHµνλ. We compute the corrections from the anisotropic sources to the power spectrum of gr…