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Variability of the High-velocity Outflow in the Quasar PDS 456
Behar, E.; Turner, T. J.; Reeves, J. N. +9 more
We present a comparison of two Suzaku X-ray observations of the nearby (z = 0.184), luminous (L bol ~ 1047 erg s-1) type I quasar, PDS 456. A new 125 ks Suzaku observation in 2011 caught the quasar during a period of low X-ray flux and with a hard X-ray spectrum, in contrast with a previous 190 ks Suzaku observatio…
Properties of Polycyclic Aromatic Hydrocarbons in the Northwest Photon Dominated Region of NGC 7023. II. Traditional PAH Analysis Using k-means as a Visualization Tool
Boersma, C.; Allamandola, L. J.; Bregman, J.
Polycyclic aromatic hydrocarbon (PAH) emission in the Spitzer-IRS spectral map of the northwest photon dominated region (PDR) in NGC 7023 is analyzed using the "traditional" approach in which the PAH bands and plateaus between 5.2-19.5 µm are isolated by subtracting the underlying continuum and removing H2 emission lines. The spec…
How to link the relative abundances of gas species in coma of comets to their initial chemical composition?
Marboeuf, Ulysse; Schmitt, Bernard
Comets are expected to be the most primitive objects in the Solar System. The chemical composition of these objects is frequently assumed to be directly provided by the observations of the abundances of volatile molecules in the coma. The present work aims to determine the relationship between the chemical composition of the coma, the outgassing p…
Origin and z-distribution of Galactic diffuse [C II] emission
Langer, W. D.; Velusamy, T.
Context. The [C ii] emission is an important probe of star formation in the Galaxy and in external galaxies. The GOT C+ survey and its follow up observations of spectrally resolved 1.9 THz [C ii] emission using Herschel HIFI provides the data needed to quantify the Galactic interstellar [C ii] gas components as tracers of star formation.
Aims…
ALMA Observations of Warm Molecular Gas and Cold Dust in NGC 34
Sanders, D. B.; Murphy, E. J.; Armus, L. +17 more
We present Atacama Large Millimeter Array (ALMA) Cycle-0 observations of the CO (6-5) line emission (rest-frame frequency = 691.473 GHz) and of the 435 µm dust continuum emission in the nuclear region of NGC 34, a local luminous infrared galaxy at a distance of 84 Mpc (1'' = 407 pc) which contains a Seyfert 2 active galactic nucleus (AGN) an…
To Stack or Not to Stack: Spectral Energy Distribution Properties of Lyα-emitting Galaxies at z = 2.1
Finkelstein, Steven L.; Ferguson, Henry; Gronwall, Caryl +13 more
We use the Cosmic Assembly Near-Infrared Deep Extragalactic Legacy Survey (CANDELS) GOODS-S multi-wavelength catalog to identify counterparts for 20 Lyα emitting (LAE) galaxies at z = 2.1. We build several types of stacked spectral energy distributions (SEDs) of these objects. We combine photometry to form average and median flux-stacked SEDs, and…
Does the Debris Disk around HD 32297 Contain Cometary Grains?
Currie, Thayne; Debes, John H.; Schneider, Glenn +13 more
We present an adaptive optics imaging detection of the HD 32297 debris disk at L' (3.8 µm) obtained with the LBTI/LMIRcam infrared instrument at the Large Binocular Telescope. The disk is detected at signal-to-noise ratio per resolution element ~3-7.5 from ~0.''3 to 1.''1 (30-120 AU). The disk at L' is bowed, as was seen at shorter wavelengt…
Statistical study of chorus wave distributions in the inner magnetosphere using Ae and solar wind parameters
Aryan, Homayon; Yearby, Keith; Balikhin, Michael +3 more
Energetic electrons within the Earth's radiation belts represent a serious hazard to geostationary satellites. The interactions of electrons with chorus waves play an important role in both the acceleration and loss of radiation belt electrons. The common approach is to present model wave distributions in the inner magnetosphere under different va…
Dust emission in star-forming dwarf galaxies: General properties and the nature of the submm excess
Izotov, Y. I.; Henkel, C.; Guseva, N. G. +2 more
We studied the global characteristics of dust emission in a large sample of emission-line star-forming galaxies. The sample consists of two subsamples. One subsample (SDSS sample) includes ~4000 compact star-forming galaxies from the Sloan Digital Sky Survey (SDSS), which were also detected in all four bands at 3.4 µm, 4.6 µm, 12 &micr…
Herschel-ATLAS and ALMA. HATLAS J142935.3-002836, a lensed major merger at redshift 1.027
Ivison, R. J.; Fu, Hai; Dunne, Loretta +36 more
Context. The submillimetre-bright galaxy population is believed to comprise, aside from local galaxies and radio-loud sources, intrinsically active star-forming galaxies, the brightest of which are lensed gravitationally. The latter enable studies at a level of detail beyond what is usually possible by the observation facility.
Aims: This wor…