Search Publications
On the Discovery of the First Galaxy Selected at 350 Microns
Eisenhardt, Peter R.; Clements, David L.; Gonzalez, Anthony H. +17 more
We report the detection of a 3.6 σ source selected at 350 µm in the Boötes Deep Field. The source, the first short-wavelength submillimeter-selected galaxy (SSG 1), was discovered as part of a blank-field extragalactic survey using the 350 µm-optimized Submillimeter High Angular Resolution Camera (SHARC II) at the Caltech Submillimeter…
A Study of Far-Ultraviolet Extinction in the Upper Scorpius Cloud Using the SPINR Sounding Rocket Experiment
Chakrabarti, S.; Lewis, N. K.; Cook, T. A.
In this study, six new interstellar extinction curves in the far-ultraviolet are presented using data from a sounding rocket experiment. The sounding rocket data were combined with IUE data for six lines of sight in the Upper Scorpius group to cover the wavelength range of 912-3030 Å. The extinction curves were produced using the pair comparison m…
A High-Resolution Mosaic of Molecular Gas in Stephan's Quintet
Petitpas, Glen R.; Taylor, Christopher L.
We present high-resolution 12CO J=1-0 observations of the molecular gas in the Hickson compact group Stephan's Quintet (HCG 92). Our observations consist of multiple pointings and mosaics covering all the regions where CO and star formation have been detected. Within the 100" field of view centered on the easternmost tidal tail, we dete…
A Potential Supernova Remnant-X-Ray Binary Association in M31
Williams, Benjamin F.; Kong, Albert K. H.; Kolb, U. +3 more
The well-studied X-ray/optical/radio supernova remnant (SNR) DDB 1-15 (CXOM31 J004327.8+411829; r3-63) in M31 has been investigated with archival XMM-Newton and Chandra observations. The timing data from XMM-Newton reveal a power density spectrum (PDS) characteristic of accreting compact objects in X-ray binaries (XRBs). The PDS shows features typ…
Study of the Solar Cycle Dependence of Low-Degree p-Modes with Michelson Doppler Imager and VIRGO
Kosovichev, A. G.; Toutain, T.
Studying variations of observational properties of low-degree solar acoustic p-modes (radial, dipole, and quadrupole) with the activity cycle is important for understanding potential effects of the cycle in the deep interior, obtaining more accurate inversions for the sound speed and rotation, and also for estimating prospective investigation of s…
Iron Fluorescent Line Emission from Black Hole Accretion Disks with Magnetic Reconnection-heated Corona
Iwasawa, K.; Mineshige, S.; Kawanaka, N.
We investigate the iron Kα fluorescent line produced by hard X-ray photons from the magnetic reconnection-heated corona. The hot corona with temperature of ~109 K can irradiate the underlying disk with a continuum X-ray spectrum produced via thermal Comptonization. Then the iron atoms in the disk photoelectrically absorb X-ray photons a…
Intense Diffuse Far-Ultraviolet Emission from the Orion Nebula
Henry, R. C.; Murthy, Jayant; Sahnow, David J.
We present spectra of the diffuse far-UV (900-1200 Å) emission from a region near the Orion Nebula: the first high-resolution spectra of the diffuse background radiation. These observations were made using serendipitous Far Ultraviolet Spectroscopic Explorer (FUSE) observations and were only possible because of the strength of the diffuse emission…
HST Images Do Not Support the Presence of Three High-Velocity, Low-Mass Runaway Stars in the Core of the Orion Nebula Cluster
O'Dell, C. R.; Robberto, Massimo; Poveda, Arcadio +1 more
A recent article has employed the determination from ground-based images of high proper motions in the Orion Nebula cluster to argue that JW 349, JW 355, and JW 451 are high-velocity (38, 89, and 69 km s-1, respectively) low-mass runaway stars. We report on the measurement of the proper motions of these stars using images made by the Hu…
The XMM-Newton View of the Relativistic Spectral Features in AX J0447-0627
Ballo, L.; Braito, V.; Della Ceca, R. +1 more
The XMM-Newton observation of the optically type 1 active galactic nucleus (AGN) AX J0447-0627 (z=0.214) unambiguously reveals a complex, bright, and prominent set of lines in the 4-8 keV rest-frame energy range. Although from a phenomenological point of view, the observed properties can be described by a simple power-law model plus five narrow Ga…
The First Optical Validation of an X-Ray Line-emitting Object: A Detection in the XMM-Newton Observation of the Chandra Deep Field-South
Braito, V.; Caccianiga, A.; Severgnini, P. +2 more
We present the first optical validation of an X-ray line-emitting object (XLEO) discovered in the XMM-Newton observation of the Chandra Deep Field-South. The object is an active galactic nucleus at zX~0.66. An optical spectrum of the source indeed confirms and refines (zo=0.665) the redshift obtained from the X-ray line. The …