Search Publications
Discovery of Pulsations and a Possible Spectral Feature in the X-Ray Emission from Rotating Radio Transient J1819-1458
Camilo, F.; Rea, N.; Chatterjee, S. +7 more
PSR J1819-1458 is a rotating radio transient (RRAT) source with an inferred surface dipole magnetic field strength of 5×1013 G and a 4.26 s spin period. We present XMM-Newton observations of the X-ray counterpart of this source, CXOU J181939.1-145804, in which we identify pulsations and a possible spectral feature. The X-ray pulsations …
GOODS 850-5: A z>4 Galaxy Discovered in the Submillimeter?
van Saders, Jennifer; Williams, Jonathan P.; Wang, Wei-Hao +2 more
We report an SMA interferometric identification of a bright submillimeter source, GOODS 850-5. This source is one of the brightest 850 µm sources in the GOODS-N but is extremely faint at all other wavelengths. It is not detected in the GOODS HST ACS images and only shows a weak 2 σ signal at 1.4 GHz. It is detected in the Spitzer IRAC bands …
Inverse Compton Scenarios for the TeV Gamma-Ray Emission of the Galactic Center
Hinton, J. A.; Aharonian, F. A.
The intense Compton cooling of ultrarelativistic electrons in the Klein-Nishina regime in radiation-dominated environments, such as that found in the Galactic center, may result in radically different electron spectra than those produced by synchrotron cooling. We explore these effects and their impact on the X-ray and γ-ray spectra produced in el…
The Moth: An Unusual Circumstellar Structure Associated with HD 61005
Henning, Thomas; Schneider, Glenn; Hines, Dean C. +11 more
We present the discovery of an unusual spatially resolved circumstellar structure associated with the ~90 Myr, nearby, G dwarf star HD 61005. Observations from the FEPS Spitzer Legacy Science survey reveal thermal emission in excess of expected stellar photospheric levels. Follow-up 0.1" resolution HST NICMOS coronagraphic images reveal scattered …
Mass Selection and the Evolution of the Morphology-Density Relation from z = 0.8 to 0
Kelson, D. D.; Demarco, R.; Rosati, P. +11 more
We examined the morphology-density relations for galaxy samples selected by luminosity and by mass in each of five massive X-ray clusters from z=0.023 to 0.83 for 674 spectroscopically confirmed members. Rest-frame optical colors and visual morphologies were obtained primarily from Hubble Space Telescope images. The visual morphologies ensure cons…
The Disk and Environment of a Young Vega Analog: HD 169142
Ménard, F.; Quirrenbach, A.; Hamaguchi, K. +15 more
We trace the disk of HD 169142 (A8 Ve) from 0.57" to 1.4" (~80-200 AU projected distance) in 1.1 µm scattered light with HST NICMOS coronagraphy. The azimuthally symmetric disk has a peak azimuthally medianed surface brightness (SB) of ~5 mJy arcsec-2 at 0.57" from the star, and drops ~r-3. This radial SB profile is con…
Using Weak-Lensing Dilution to Improve Measurements of the Luminous and Dark Matter in A1689
Broadhurst, Tom; Kong, Xu; Coe, Dan +6 more
The E/S0 sequence of a cluster defines a boundary redward of which a reliable weak-lensing signal can be obtained from background galaxies, uncontaminated by cluster members. For bluer colors, both background and cluster members are present, reducing the average distortion signal by the proportion of unlensed cluster members. In deep Subaru and HS…
Spectacular Shells in the Host Galaxy of the QSO MC2 1635+119
Schweizer, François; Lacy, Mark; Stockton, Alan +4 more
We present deep HST ACS images and Keck spectroscopy of MC2 1635+119, a QSO hosted by a galaxy previously classified as an undisturbed elliptical galaxy. Our new images reveal dramatic shell structure indicative of a merger event in the relatively recent past. The brightest shells in the central regions of the host are distributed alternately in r…
Kink-induced Catastrophe in a Coronal Eruption
Liu, Rui; Alexander, David; Gilbert, Holly R.
We investigate the kinking motion and its role in the eruption of a filament/cavity system that occurred on 2002 October 31. The evolution of the eruptive filament consists of four distinct phases. After an initial slow upward acceleration, the filament experiences a quasi-static phase exhibiting kinking motions of the filament axis. The kinking p…
The Blue Straggler Population of the Globular Cluster M5
Dalessandro, E.; Beccari, G.; Ferraro, F. R. +5 more
By combining high-resolution HST and wide-field ground-based observations, in ultraviolet and optical bands, we study the blue straggler star (BSS) population of the galactic globular cluster M5 (NGC 5904) from its very central regions up to its periphery. The BSS distribution is highly peaked in the cluster center, decreases at intermediate radii…