Search Publications
A multiwavelength infrared study of NGC 891
Madden, S. C.; Galliano, F.; Bendo, G. J. +2 more
We present a multiwavlength infrared (IR) study of the nearby, edge-on, spiral galaxy NGC 891. We have examined 20 independent, spatially resolved IR images of this galaxy, 14 of which are newly reduced and/or previously unpublished images. These images span a wavelength regime from λ1.2µm in which the emission is dominated by cool stars, th…
A Smoking Gun in the Carina Nebula
Hamaguchi, Kenji; Corcoran, Michael F.; Petre, Rob +8 more
The Carina Nebula is one of the youngest, most active sites of massive star formation in our Galaxy. In this nebula, we have discovered a bright X-ray source that has persisted for ~30 years. The soft X-ray spectrum, consistent with kT ~ 128 eV blackbody radiation with mild extinction, and no counterpart in the near- and mid-infrared wavelengths i…
Evidence for Morphology and Luminosity Transformation of Galaxies at High Redshifts
Hwang, Ho Seong; Park, Changbom
We study the galaxy morphology-luminosity-environmental relation and its redshift evolution using a spectroscopic sample of galaxies in the Great Observatories Origins Deep Survey. In the redshift range of 0.4 <= z <= 1.0, we detect conformity in morphology between neighboring galaxies. The realm of conformity is confined within the virializ…
Young stars and protostellar cores near NGC 2023
Mookerjea, B.; Sandell, G.; Jarrett, T. H. +1 more
Context: We investigate the young (proto)stellar population in NGC 2023 and the L 1630 molecular cloud bordering the h ii region IC 434, using Spitzer IRAC and MIPS archive data, JCMT SCUBA imaging and spectroscopy as well as targeted BIMA observations of one of the Class 0 protostars, NGC 2023 MM 1.
Aims: We study the distribution of gas, dus…
A Very Large Array Radio Survey of Early-Type Galaxies in the Virgo Cluster
Axon, David J.; Merritt, David; Capetti, Alessandro +2 more
We present the results of an 8.4 GHz Very Large Array radio survey of early-type galaxies extracted from the sample selected by Côté and collaborators for the Advanced Camera for Surveys Virgo Cluster Survey. The aim of this survey is to investigate the origin of radio emission in early-type galaxies and its link with the host properties in an une…
On the origin of the 511-keV emission in the Galactic Centre
Maccarone, Thomas J.; Taylor, James E.; Silk, Joseph +1 more
Diffuse 511-keV line emission, from the annihilation of cold positrons, has been observed in the direction of the Galactic Centre for more than 30yr. The latest high-resolution maps of this emission produced by the SPI instrument on INTEGRAL suggest at least one component of the emission is spatially coincident with the distribution of ~70 luminou…
Gravity waves in the upper atmosphere of Venus revealed by CO2 nonlocal thermodynamic equilibrium emissions
Drossart, P.; Piccioni, G.; Occhipinti, G. +2 more
The imaging capabilities of the Visible and Infrared Thermal Imaging Spectrometer-Mapper (VIRTIS-M) onboard Venus Express mission are used to analyze perturbations of CO2 nonlocal thermodynamic equilibrium emissions in the thermosphere of Venus. These emissions with a wavelength of 4.3 µm originate from the 110-140 km altitude ran…
Classification of Extremely Red Objects in the Cosmos Field
Fang, Guanwen; Kong, Xu; Wang, Min +1 more
We present a study of the classification of z ~ 1 extremely red objects (EROs), using a combination of Hubble Space Telescope (HST) Advanced Camera for Surveys (ACS), Spitzer Infrared Array Camera (IRAC), and ground-based images of the COSMOS field. Our sample includes ~5300 EROs with i - K s >= 2.45 (AB, equivalently I - K s
Optical properties of dust from Jupiter family comets
Levasseur-Regourd, A. C.; Hadamcik, E.
To try to define specific physical properties of the dust of Jupiter-family comets (JFCs), we compare the light scattered by them. Amongst the more than 1000 JFCs, less than 200 are numbered, 40 of them being rather bright. In the present work we use data from the latter. In situ observations of three nuclei show low albedo surfaces. The albedo of…
Saturn's Magnetospheric Configuration
Persoon, Ann M.; Gombosi, Tamas I.; Krupp, Norbert +5 more
This Chapter summarizes our current understanding of Saturn's magnetospheric configuration. Observations from the Cassini Prime and Equinox Missions have answered some questions and opened new ones. One of the fundamental questions of magnetospheric physics is what are the sources of the plasma that populate the magnetosphere. At Saturn, there is …