Search Publications
AKARI Near-Infrared Spectroscopy: Detection of H2O and CO2 Ices toward Young Stellar Objects in the Large Magellanic Cloud
Onaka, Takashi; Ita, Yoshifusa; Sakon, Itsuki +4 more
We present the first results of AKARI Infrared Camera near-infrared spectroscopic survey of the Large Magellanic Cloud (LMC). We detected absorption features of the H2O ice 3.05 µm and the CO2 ice 4.27 µm stretching mode toward seven massive young stellar objects (YSOs). These samples are for the first time spectr…
Field Line Shrinkage in Flares Observed by the X-Ray Telescope on Hinode
Reeves, Katharine K.; Forbes, Terry G.; Seaton, Daniel B.
The X-Ray Telescope on Hinode has observed individual loops of plasma moving downward in a manner that is consistent with field line shrinkage in the aftermath of reconnection at higher altitudes. An on-disk B3.8 flare observed on 2007 May 2 has loops that clearly change in shape from cusp-shaped to more rounded. In addition, bright loops are obse…
Chandra Observations of the Pulsar B1929+10 and Its Environment
Garmire, G. P.; Pavlov, G. G.; Misanovic, Z.
We report on two Chandra observations of the 3 Myr old pulsar B1929+10, which reveal a faint compact (~9'' × 5'') nebula elongated in the direction perpendicular to the pulsar's proper motion, two patchy wings, and a possible short (~3'') jet emerging from the pulsar. In addition, we detect a tail extending up to a…
A Radio through X-Ray Study of the Jet/Companion-Galaxy Interaction in 3C 321
Lee, Julia C.; Kraft, Ralph P.; Birkinshaw, Mark +6 more
We present a multiwavelength study of the nucleus, environment, jets, and hot spots of the nearby FR II radio galaxy 3C 321, using new and archival data from MERLIN, the VLA, Spitzer, HST, and Chandra. An initially collimated radio jet extends northwest from the nucleus of its host galaxy and produces a compact knot of radio emission adjacent (in …
Metallicity and Physical Conditions in the Magellanic Bridge
Keenan, F. P.; Smoker, J. V.; Lehner, N. +1 more
We present a new analysis of the diffuse gas in the Magellanic Bridge (R.A. gtrsim 3h) based on HST STIS E140M and FUSE spectra of two early-type stars lying within the Bridge and a QSO behind it. We derive the column densities of the H I (from Lyα), N I, O I, Ar I, Si II, S II, and Fe II of the gas in the Bridge. Using the atomic speci…
The Environment of M85 Optical Transient 2006-1: Constraints on the Progenitor Age and Mass
Cenko, S. B.; Kulkarni, S. R.; Ferrarese, L. +11 more
M85 Optical Transient 2006-1 (M85 OT 2006-1) is the most luminous member of the small family of V838 Mon-like objects, whose nature is still a mystery. This event took place in the Virgo Cluster of galaxies and peaked at an absolute magnitude of MI ≈ - 13. Here we present Hubble Space Telescope images of M85 OT 2006-1 and its environmen…
The (Re-)Discovery of G350.1-0.3: A Young, Luminous Supernova Remnant and Its Neutron Star
Camilo, F.; Miller, J. M.; Gaensler, B. M. +6 more
We present an XMM-Newton observation of the long-overlooked radio source G350.1-0.3. The X-ray spectrum of G350.1-0.3 can be fit by a shocked plasma with two components: a high-temperature (1.5 keV) region with a low ionization timescale and enhanced abundances, plus a cooler (0.36 keV) component in ionization equilibrium and with solar abundances…
Color Profiles of Disk Galaxies since z ~ 1: Probing Outer Disk Formation Scenarios
Beckman, J. E.; Trujillo, I.; Azzollini, R.
We present deep color profiles for a sample of 415 disk galaxies within the redshift range 0.1 < z <= 1.1, and contained in HST ACS imaging of the GOODS-South field. For each galaxy, passband combinations are chosen to obtain, at each redshift, the best possible approximation to the rest-frame u - g color. We find that objects which show a t…
GRB 070201: A Possible Soft Gamma-Ray Repeater in M31
Cenko, S. B.; Stiele, H.; Pietsch, W. +13 more
GRB 070201 was a bright, short-duration, hard-spectrum gamma-ray burst detected by the Interplanetary Network. Its error quadrilateral, which has an area of 0.124 deg2, intersects some prominent spiral arms of the nearby M31 (Andromeda) galaxy. Given the properties of this GRB, along with the fact that LIGO data argue against a compact …
The Late Stellar Assembly of Massive Cluster Galaxies via Major Merging
Tran, Kim-Vy H.; Moustakas, John; Gonzalez, Anthony H. +3 more
We present multiwavelength observations of the brightest galaxies in four X-ray-luminous groups at z ~ 0.37 that will merge to form a cluster comparable in mass to Coma. Ordered by increasing stellar mass, the four brightest group galaxies (BGGs) present a time sequence where BGG-1, 2, and 3 are in merging systems and BGG-4 is a massive remnant (M…