Search Publications
One Thousand and One Clusters: Measuring the Bulk Flow with the Planck ESZ and X-Ray-selected Galaxy Cluster Catalogs
Hajian, Amir; Mody, Krishnan
We present our measurement of the "bulk flow" using the kinetic Sunyaev-Zel'dovich (kSZ) effect in the Wilkinson Microwave Anisotropy Probe (WMAP) seven-year data. As the tracer of peculiar velocities, we use Planck Early Sunyaev-Zel'dovich Detected Cluster Catalog and a compilation of X-ray-detected galaxy cluster catalogs based on ROSAT All-Sky …
Star Formation and Young Population of the H II Complex Sh2-294
Samal, M. R.; Ojha, D. K.; Pandey, A. K. +3 more
The Sh2-294 H II region ionized by a single B0V star features several infrared excess sources, a photodissociation region, and also a group of reddened stars at its border. The star formation scenario in this region seems to be quite complex. In this paper, we present follow-up results of Sh2-294 H II region at 3.6, 4.5, 5.8, and 8.0 µm obse…
A Companion as the Cause of Latitude-dependent Effects in the Wind of Eta Carinae
Madura, T. I.; Hillier, D. J.; Weigelt, G. +2 more
We analyze spatially resolved spectroscopic observations of the Eta Carinae binary system obtained with the Hubble Space Telescope/STIS. Eta Car is enshrouded by the dusty Homunculus nebula, which scatters light emitted by the central binary and provides a unique opportunity to study a massive binary system from different vantage points. We invest…
The Illumination and Growth of CRL 2688: An Analysis of New and Archival Hubble Space Telescope Observations
Frank, Adam; Corradi, Romano L. M.; Balick, Bruce +3 more
We present four-color images of CRL 2688 obtained in 2009 using the Wide-Field Camera 3 on Hubble Space Telescope. The F606W image is compared with archival images in very similar filters to monitor the proper motions of nebular structure. We find that the bright N-S lobes have expanded uniformly by 2.5% and that the ensemble of rings has translat…
Characterization of the Distribution of the Lyα Emitters in the 53w002 Field at z = 2.4
Yamada, T.; Matsuda, Y.; Hayashino, T. +2 more
We present the results of our wide-field narrowband imaging of the field around the radio galaxy 53W002 at z = 2.390 with Subaru/Suprime-Cam. A custom-made filter, NB413, centered at 4140 Å with a width of 83 Å is used to observe the 31' × 24' area around the radio galaxy. We detected 204 Lyα emitters (LAEs) at z = 2.4 with a rest-frame equivalent…
Rapid Transition of Uncombed Penumbrae to Faculae during Large Flares
Liu, Chang; Wang, Haimin; Deng, Na
In the past two decades, the complex nature of sunspots has been disclosed with high-resolution observations. One of the most important findings is the "uncombed" penumbral structure, where a more horizontal magnetic component carrying most of Evershed flows is embedded in a more vertical magnetic background. The penumbral bright grains are locati…
Morpho-kinematic Analysis of the Point-symmetric, Bipolar Planetary Nebulae Hb 5 and K 3-17, A Pathway to Poly-polarity
López, J. A.; Steffen, W.; García-Díaz, Ma. T. +2 more
The kinematics of the bipolar planetary nebulae Hb 5 and K 3-17 are investigated in detail by means of a comprehensive set of spatially resolved high spectral resolution, long-slit spectra. Both objects share particularly interesting characteristics, such as a complex filamentary, rosette-type nucleus, axial point-symmetry, and very fast bipolar o…
X-Ray Spectral Variability in NGC 3783
Fabian, A. C.; Miller, J. M.; Reynolds, C. S. +6 more
NGC 3783 was observed for approximately 210 ks by Suzaku and in this time showed significant spectral and flux variability at both short (20 ks) and long (100 ks) timescales. The full observation is found to consist of approximately six "spectral periods" where the behavior of the soft (0.3-1.0 keV) and hard (2-10 keV) bands are somewhat distinct.…
Discovery of the Most Isolated Globular Cluster in the Local Universe
Lee, Myung Gyoon; Jang, In Sung; Lim, Sungsoon +1 more
We report the discovery of two new globular clusters in the remote halos of M81 and M82 in the M81 Group based on Hubble Space Telescope archive images. They are brighter than typical globular clusters (MV = -9.34 mag for GC-1 and MV = -10.51 mag for GC-2), and much larger than known globular clusters with similar luminosity …
Recurrent Radio Outbursts at the Center of the NGC 1407 Galaxy Group
Raychaudhury, Somak; Clarke, Tracy E.; Giacintucci, Simona +6 more
We present deep Giant Metrewave Radio Telescope (GMRT) radio observations at 240, 330, and 610 MHz of the complex radio source at the center of the NGC 1407 galaxy group. Previous GMRT observations at 240 MHz revealed faint, diffuse emission enclosing the central twin-jet radio galaxy. This has been interpreted as an indication of two possible rad…