Search Publications
Bow Shocks from Neutron Stars: Scaling Laws and Hubble Space Telescope Observations of the Guitar Nebula
Chatterjee, S.; Cordes, J. M.
The interaction of high-velocity neutron stars with the interstellar medium produces bow shock nebulae, in which the relativistic neutron star wind is confined by ram pressure. We present multiwavelength observations of the Guitar Nebula, including narrowband Hα imaging with Hubble Space Telescope (HST) WFPC2, which resolves the head of the bow sh…
Mid-Infrared Observation of Mass Loss in Elliptical Galaxies
Sauvage, Marc; Temi, Pasquale; Bregman, Jesse +2 more
Early-type galaxies exhibit thermal and molecular resonance emission from dust that is shed and heated through stellar mass loss as a subset of the population moves through the asymptotic giant branch (AGB) phase of evolution. Because this emission can give direct insight into stellar evolution in addition to galactic stellar mass loss and interst…
Spatial Resolution of High-Velocity Filaments in the Narrow-Line Region of NGC 1068: Associated Absorbers Caught in Emission?
Ferruit, Pierre; Dopita, Michael A.; Groves, Brent +4 more
Using the STIS spectrograph on the Hubble Space Telescope, we have obtained a grid of [O III] λλ4959, 5007 and Hβ emission-line spectra at 0.05"×0.19"" and 60 km s-1 (FWHM) resolution that covers much of the narrow-line region (NLR) of NGC 1068. We find emitting knots that have blueshifted radial velocities up to 3200 km s-1 …
The X-Ray-Radio Alignment in the z=2.2 Radio Galaxy PKS 1138-262
Pentericci, L.; Röttgering, H. J. A.; Miley, G. K. +4 more
We present high-resolution X-ray observations of the narrow-line radio galaxy PKS 1138-262 at z=2.156 with the ACIS-S detector on the Chandra X-Ray Observatory. These observations show that the X-ray emission from 1138-262 is dominated by emission from the active galactic nucleus (AGN) with a 2-10 keV luminosity of 4×1045 ergs s-1<…
Infrared Emission from Interstellar Dust. III. The Small Magellanic Cloud
Draine, B. T.; Li, Aigen
The infrared emission from interstellar dust in the Small Magellanic Cloud is modeled using a mixture of amorphous silicate and carbonaceous grains, including a population of polycyclic aromatic hydrocarbon (PAH) molecules. We show the following: (1) This dust model is able to reproduce the spectral energy distribution from near-IR to far-IR for t…
The Diversity of Extremely Red Objects
Ivison, R. J.; Smail, Ian; Morrison, G. E. +3 more
We present the results from a sensitive multiwavelength analysis of the properties of extremely red objects (EROs). Our analysis employs deep RIzJHK photometry of an 8.5‧×8.5‧ region to select a sample of 68 EROs with (R-K)>=5.3 and brighter than K=20.5 (5 σ). We combine this photometric data set with an extremely deep 1.4 GHz radio map of the …
Simultaneous Observation of a Moreton Wave on 1997 November 3 in Hα and Soft X-Rays
Narukage, N.; Hudson, H. S.; Shibata, K. +4 more
We report the observation of a Moreton wave in Hα (line center and +/-0.8 Å) with the Flare Monitoring Telescope at the Hida Observatory of Kyoto University at 4:36-4:41 UT on 1997 November 3. The same region (NOAA Active Region 8100) was simultaneously observed in soft X-rays with the soft X-ray telescope on board Yohkoh, and a wavelike disturban…
Are Homologous Flare-Coronal Mass Ejection Events Triggered by Moving Magnetic Features?
Zhang, Jun; Wang, Jingxiu
Coronal mass ejections (CMEs) often present destabilization and eruption of a global (or large-scale) magnetic structure in the solar atmosphere. Furthermore, the Earth-directed CMEs are the primary driver of the disastrous space weather. Here we report on five homologous CMEs. They initiated in the early phase of five homologous X-class flares se…
Chandra Study of Young Stellar Objects in the NGC 1333 Star-forming Cloud
Lada, Charles J.; Bally, John; Feigelson, Eric D. +3 more
NGC 1333, a highly active star formation region within the Perseus molecular cloud complex, has been observed with the ACIS-I detector on board the Chandra X-Ray Observatory. In our image with a sensitivity limit of ~1028 ergs s-1, we detect 127 X-ray sources, most with subarcsecond positional accuracy. While 32 of these sour…
Pulse Phase Variations of the X-Ray Spectral Features in the Radio-quiet Neutron Star 1E 1207-5209
Caraveo, P. A.; Bignami, G. F.; Mereghetti, S. +3 more
We present the results of an XMM-Newton observation of the radio-quiet X-ray pulsar 1E 1207-5209 located at the center of the shell-like supernova remnant G296.5+10.0. The X-ray spectrum is characterized by the presence of two phase-dependent absorption lines at energies of ~0.7 and ~1.4 keV. Moreover, these broad spectral features have significan…