Search Publications

VLBA Observations of Strong Anisotripic Radio Scattering Toward the Orion Nebula

Kounkel, Marina; Rodríguez, Luis F.; Loinard, Laurent +6 more

We present observations of VLBA 20, a radio source found toward the edge of the Orion Nebula Cluster (ONC). Nonthermal emission dominates the spectral energy distribution of this object from the radio to mid-infrared regime, suggesting that VLBA 20 is extragalactic. This source is heavily scattered in the radio regime. Very Long Baseline Array obs…

Imaging Parity-violating Modes in the CMB

Contaldi, Carlo R.

Correlations of polarization components in the coordinate frame are a natural basis for searches of parity-violating modes in the cosmic microwave background. This fact can be exploited to build estimators of parity-violating modes that are local and robust with respect to partial-sky coverage or inhomogeneous weighting. As an example application …

A New Look at the Integrated Radio/Microwave Continuum Spectrum of Galactic Supernova Remnant IC 443

Onić, D.; Leahy, D.; Urošević, D.

Recent observations of the microwave sky, by space telescopes such as the Wilkinson Microwave Anisotropy Probe and Planck, have opened a new window into the analysis of continuum emission from supernova remnants (SNRs). In this paper, different emission models that can explain the characteristic shape of currently known integrated radio/microwave …

Erratum: “The Herschel Inventory of the Agents of Galaxy Evolution (Heritage) in the Magellanic Clouds, a Herschel Open Time Key Program” (2013, AJ, 146, 62)

Poglitsch, A.; van Loon, J. Th.; Bernard, J. -P. +52 more

Optical Spectroscopic Observations of Blazars and γ-Ray Blazar Candidates in the Sloan Digital Sky Survey Data Release Nine

Masetti, N.; Funk, S.; Massaro, F. +2 more

We present an analysis of the optical spectra available in the Sloan Digital Sky Survey data release nine (SDSS DR9) for the blazars listed in the ROMA-BZCAT and for the γ-ray blazar candidates selected according to their IR colors. First, we adopt a statistical approach based on Monte Carlo simulations to find the optical counterparts of the blaz…

Outflows, Dusty Cores, and a Burst of Star Formation in the North America and Pelican Nebulae

Ginsburg, Adam; Bally, John; Stringfellow, Guy S. +3 more

We present observations of near-infrared 2.12 µm molecular hydrogen outflows emerging from 1.1 mm dust continuum clumps in the North America and Pelican Nebula (NAP) complex selected from the Bolocam Galactic Plane Survey (BGPS). Hundreds of individual shocks powered by over 50 outflows from young stars are identified, indicating that the du…

Optical TiO and VO Band Emission in Two Embedded Protostars: IRAS 04369+2539 and IRAS 05451+0037

Hillenbrand, Lynne A.; Knapp, Gillian R.; Rebull, Luisa M. +2 more

Archival spectra from the Sloan Digital Sky Survey of two optically faint flat-spectrum protostars, IRAS 04369+2539 and IRAS 05451+0037, show strong emission-line features including—notably—clear and broad emission across several molecular bands of TiO and VO. The molecular emission is indicative of dense, warm circumstellar gas and has been seen …

A Spitzer-MIPS Search for Dust in Compact High-velocity H I Clouds

Elvis, Martin; Williams, Rik J.; Nicastro, Fabrizio +2 more

We employ three-band Spitzer-MIPS observations to search for cold dust emission in three neutral hydrogen compact high-velocity clouds (CHVCs) in the vicinity of the Milky Way. Far-infrared emission correlated with H I column density was previously reported in HVC Complex C, indicating that this object contains dust heated by the Galactic radiatio…