Search Publications
The Shaping of the Multipolar Pre-planetary Nebula CRL 618 by Multidirectional Bullets
Lee, Chin-Fei; Moraghan, Anthony; Smith, Michael +1 more
In order to understand the formation of the multipolar structures of the pre-planetary nebula CRL 618, we perform 3D simulations using a multidirectional bullet model. The optical lobes of CRL 618 and fast molecular outflows at the tips of the lobes have been found to have similar expansion ages of ∼100 yr. Additional fast molecular outflows were …
Chandra Observations of Eight Sources Discovered by INTEGRAL
Rahoui, Farid; Fornasini, Francesca M.; Bodaghee, Arash +5 more
We report on 0.3-10 keV observations with the Chandra X-ray Observatory of eight hard X-ray sources discovered within 8° of the Galactic plane by the International Gamma-ray Astrophysics Laboratory satellite. The short (∼5 ks) Chandra observations of the IGR source fields have yielded very likely identifications of X-ray counterparts for three of …
XMM-Newton Slew Survey Observations of the Gravitational Wave Event GW150914
Troja, E.; Salvaterra, R.; Read, A. M. +1 more
The detection of the first gravitational wave (GW) transient GW150914 prompted an extensive campaign of follow-up observations at all wavelengths. Although no dedicated XMM-Newton observations have been performed, the satellite passed through the GW150914 error region during normal operations. Here we report the analysis of the data taken during t…
CARMA Large Area Star Formation Survey: Dense Gas in the Young L1451 Region of Perseus
Kwon, Woojin; Meisner, Aaron M.; Kauffmann, Jens +18 more
We present a 3 mm spectral line and continuum survey of L1451 in the Perseus Molecular Cloud. These observations are from the CARMA Large Area Star Formation Survey (CLASSy), which also imaged Barnard 1, NGC 1333, Serpens Main, and Serpens South. L1451 is the survey region with the lowest level of star formation activity—it contains no confirmed p…
Strong Lyα Emission in the Proximate Damped Lyα Absorption Trough toward the Quasar SDSS J095253.83+011422.0
Shu, Xinwen; Gu, Qiusheng; Li, Zhenzhen +10 more
SDSS J095253.83+011422.0 (J0952+0114) was reported by Hall et al. as an exotic quasar at zem = 3.020. In contrast to prominent broad metal-line emission with FWHM ∼ 9000 km s-1, only a narrow Lyα emission line is present with FWHM ∼ 1000 km s-1. The absence of a broad Lyα emission line has been a mystery for more t…
New Insights into the Spectral Variability and Physical Conditions of the X-Ray Absorbers in NGC 4151
Turner, T. J.; Kraemer, S. B.; Crenshaw, D. M. +1 more
We investigate the relationship between the long-term X-ray spectral variability in the Seyfert 1.5 galaxy NGC 4151 and its intrinsic absorption, by comparing the 2014 simultaneous ultraviolet/X-ray observations taken with Hubble STIS Echelle and Chandra HETGS with archival observations from Chandra, XMM-Newton, and Suzaku. The observations are di…
Morphological Properties of Lyα Emitters at Redshift 4.86 in the Cosmos Field: Clumpy Star Formation or Merger?
Koekemoer, Anton M.; Kajisawa, Masaru; Nagao, Tohru +7 more
We investigate morphological properties of 61 Lyα emitters (LAEs) at z = 4.86 identified in the COSMOS field, based on Hubble Space Telescope Advanced Camera for Surveys (ACS) imaging data in the F814W band. Out of the 61 LAEs, we find the ACS counterparts for 54 LAEs. Eight LAEs show double-component structures with a mean projected separation of…
The Quest for the Largest Depleted Galaxy Core: Supermassive Black Hole Binaries and Stalled Infalling Satellites
Graham, Alister W.; Bonfini, Paolo
Partially depleted cores are practically ubiquitous in luminous early-type galaxies (M B ≲ -20.5 mag) and are typically smaller than 1 kpc. In one popular scenario, supermassive black hole (SMBH) binaries—established during dry (I.e., gas-poor) galaxy mergers—kick out the stars from a galaxy’s central region via three-body interaction…
The Effect of Unresolved Binaries on Globular Cluster Proper-motion Dispersion Profiles
Anderson, J.; Schinnerer, E.; van der Marel, R. P. +5 more
High-precision kinematic studies of globular clusters (GCs) require an accurate knowledge of all possible sources of contamination. Among other sources, binary stars can introduce systematic biases in the kinematics. Using a set of Monte Carlo cluster simulations with different concentrations and binary fractions, we investigate the effect of unre…
Protoplanetary Disks in the Hostile Environment of Carina
Tsamis, Y. G.; Henney, W. J.; Mesa-Delgado, A. +2 more
We report the first direct imaging of protoplanetary disks in the star-forming region of Carina, the most distant massive cluster in which disks have been imaged. Using the Atacama Large Millimeter/sub-millimeter Array (ALMA), the disks are observed around two young stellar objects (YSOs) that are embedded inside evaporating gaseous globules and e…