Search Publications
UM 625 Revisited: Multiwavelength Study of a Seyfert 1 Galaxy with a Low-mass Black Hole
Ho, Luis C.; Jiang, Ning; Dong, Xiao-Bo +2 more
UM 625, previously identified as a narrow-line active galactic nucleus (AGN), actually exhibits broad Hα and Hβ lines whose width and luminosity indicate a low black hole (BH) mass of 1.6 × 106 M ⊙. We present a detailed multiwavelength study of the nuclear and host galaxy properties of UM 625. Analysis of Chandra and XMM-New…
Possible Detection of a Cyclotron Resonance Scattering Feature in the X-Ray Pulsar 4U 1909+07
Paul, Biswajit; Naik, Sachindra; Jaisawal, Gaurava K.
We present timing and broad band spectral studies of the high-mass X-ray binary pulsar 4U 1909+07 using data from Suzaku observations during 2010 November 2-3. The pulse period of the pulsar is estimated to be 604.11 ± 0.14 s. Pulsations are seen in the X-ray light curve up to ~70 keV. The pulse profile is found to be strongly energy-dependent: a …
Test for Wavevector Anisotropies in Plasma Turbulence Cascades
Gary, S. Peter
The frequency and wavevector matching conditions in nonlinear three-wave coupling are used to test whether the forward cascade of plasma turbulence may lead to wavevector anisotropies in a homogeneous, collisionless, magnetized plasma. Linear kinetic theory at β p = 0.01, 0.10, and 1.0 is used to determine the frequency-wavenumber disp…
Serendipitous Detection of X-Ray Emission from the Hot Born-again Central Star of the Planetary Nebula K 1-16
Kastner, Joel H.; Montez, Rodolfo, Jr.
We report the serendipitous detection of point-like X-ray emission from the hot, PG1159-type central star of the planetary nebula (CSPN) K 1-16 by the XMM-Newton and Chandra X-Ray Observatories. The CSPN lies superimposed on a galaxy cluster that includes an X-ray-bright quasar, but we have successfully isolated the CSPN X-ray emission from the st…
[Fe II] 1.64 µm Features of Jets and Outflows from Young Stellar Objects in the Carina Nebula
Lyo, A. -Ran; Pyo, Tae-Soo; Park, Byeong-Gon +11 more
We present [Fe II] 1.64 µm imaging observations for jets and outflows from young stellar objects (YSOs) over the northern part (~24' × 45') of the Carina Nebula, a massive star-forming region. The observations were performed with IRIS2 of the Anglo-Australian Telescope and the seeing was ~1.''5 ± 0.''5. Eleven jet and outflow features are de…
The SCORE Scale: A Coronal Mass Ejection Typification System Based On Speed
Zheng, Yihua; Taktakishvili, Aleksandre; Hesse, Michael +4 more
Distances to dwarf galaxies of the Canes Venatici I cloud
Makarova, L. N.; Makarov, D. I.; Uklein, R. I.
We determined the spatial structure of the scattered concentration of galaxies in the Canes Venatici constellation. We redefined the distances for 30 galaxies of this region using the deep images from the Hubble Space Telescope archive with the WFPC2 and ACS cameras.We carried out a high-precision stellar photometry of the resolved stars in these …
Observations of Anomalous Microwave Emission from HII Regions
Dickinson, Clive
In this brief review, I give a summary of the observations of Anomalous Microwave Emission (AME) from HII regions. AME has been detected in, or in the vicinity of, HII regions. Given the difficulties in measuring accurate SEDs over a wide range of frequencies and in complex environments, many of these detections require more data to confirm them a…
A Cluster Pair: A3532 and A3530
Singh, K. P.; Saikia, D. J.; Hunstead, R. W. +1 more
We present a detailed study of a close pair of clusters of galaxies, A3532 and A3530, and their environments. The Chandra X-ray image of A3532 reveals the presence of substructures on scales of ~20'' in its core. XMM-Newton maps of the clusters show excess X-ray emission from an overlapping region between them. Spectrally determined projected temp…
Atmospheric Escape and Climate Evolution of Terrestrial Planets
Leblanc, F.; Brain, D.; Chassefière, E. +1 more