Search Publications
An Optical-Infrared Jet in 3C 133
O'Dea, Christopher P.; Baum, Stefi; Chiaberge, Marco +10 more
We report the discovery of a new optical-IR synchrotron jet in the radio galaxy 3C 133 from our HST NICMOS snapshot survey. The jet and eastern hot spot are well resolved and visible at both optical and IR wavelengths. The IR jet follows the morphology of the inner part of the radio jet, with three distinct knots identified with features in the ra…
On the Spiral Structure of NGC 5248: An Analytic Approach
Yuan, Chi; Yang, Chao-Chin
An improved nonlinear asymptotic theory of spiral density waves is developed. It extends the theory developed by Yuan & Kuo to a global theory, not just one limited to the vicinity of the resonance. It can then be applied to the recent high-resolution observations of CO and HST NICMOS of nearby spiral galaxies. As an example, we apply the theo…
Direct Observation of Low Coronal Breakout: Does Breakout Precede or Follow Solar Eruption?
Cho, K. -S.; Moon, Y. -J.; Choe, G. S. +3 more
In this Letter, we report a direct SOHO LASCO C1 observation of low coronal ``magnetic breakout'' that occurred during the coronal mass ejection (CME) on 1998 March 23. The LASCO C1 images show that a slowly expanding, small coronal loop on the northeastern limb erupted, becoming a CME with the typical three-part structure (core, void, and front).…
Thermal Composition and Doppler Velocities in a Transequatorial Loop at the Solar Limb
Brosius, Jeffrey W.
We observed a transequatorial loop (TEL) connecting NOAA Active Regions 10652 and 10653 at the west solar limb on 2004 July 29 with the Extreme-Ultraviolet Imaging Telescope (EIT) and the Coronal Diagnostic Spectrometer (CDS) aboard the Solar and Heliospheric Observatory. Only the loop's northern leg was observed with CDS. The loop appeared bright…
G0.570-0.018: A Young Supernova Remnant? INTEGRAL and VLA Observations
Terrier, R.; Renaud, M.; Bykov, A. M. +4 more
We report INTEGRAL IBIS γ-ray and VLA radio observations of G0.570-0.018, a diffuse X-ray source recently discovered by ASCA and Chandra in the Galactic center region. Based on its spectrum and morphology, G0.570-0.018 has been proposed to be a very young supernova remnant. In this scenario, the presence of γ-ray lines coming from the short-lived …
Optical and Infrared Nondetection of the z = 10 Galaxy behind Abell 1835
Smith, Graham P.; Egami, Eiichi; Eisenhardt, Peter R. +2 more
Gravitational lensing by massive galaxy clusters is a powerful tool for the discovery and study of high-redshift galaxies, including those at z>=6 likely responsible for cosmic reionization. Pelló et al. recently used this technique to discover a candidate gravitationally magnified galaxy at z=10 behind the massive cluster lens Abell 1835 (z=0.…
Revealing the Mid-Infrared Emission Structure of IRAS 16594-4656 and IRAS 07027-7934
García-Lario, P.; Acosta-Pulido, J. A.; García-Hernández, D. A. +3 more
TIMMI2 diffraction-limited mid-infrared images of a multipolar proto-planetary nebula IRAS 16594-4656 and a young [WC] elliptical planetary nebula IRAS 07027-7934 are presented. Their dust shells are for the first time resolved (only marginally in the case of IRAS 07027-7934) by applying the Lucy-Richardson deconvolution algorithm to the data, tak…
XMM-Newton Detection of the Supernova Remnant G337.2+0.1
Albacete Colombo, Juan F.; Benaglia, Paula; Combi, Jorge A. +1 more
We report the first XMM-Newton detection of the SNR candidate G337.2+0.1 (=AX J1635.9-4719). The object shows centrally filled and diffuse X-ray emission. The emission peaks in the hard 3.0-10.0 keV band. A spatially resolved spectral study confirms that the column density of the central part of the SNR is about NH~5.9(+/-1.5)×1022…
HST WFPC2 Observations of the Peculiar Main Sequence of the Double Star Cluster NGC 2011 in the Large Magellanic Cloud
Gouliermis, D. A.; Dapergolas, A.; Kontizas, M. +2 more
We report the serendipitous discovery of a peculiar main sequence in archived Hubble Space Telescope Wide Field Planetary Camera 2 (WFPC2) observations of the young star cluster NGC 2011 in the Large Magellanic Cloud. The bright part of this main sequence exhibits a prominent double, forklike feature, as if it consists of twin main sequences, one …
On VI Asymmetry and an Accelerated Outflow in an Obscured Seyfert: FUSE and HST STIS Spectroscopy of Mrk 533
Hutchings, John; Whittle, Mark; Wills, Beverley J. +2 more
We present far-ultraviolet spectra of the Seyfert 2 galaxy Mrk 533 obtained with FUSE. These spectra show narrow asymmetrical O VI λλ1032,1038 emission lines with stronger wings shortward of the peak wavelength, but the degree of asymmetry of these wings in velocity is much lower than that of the wings of the lines of lower ionization. In the comb…