Search Publications
Fe-K Line Time Variability and Ni Abundance of Distant Reflectors in Seyfert Galaxies
Fukazawa, Yasushi; Ohno, Masanori; Noda, Hirofumi +3 more
We have performed systematic studies of narrow Fe-K line (6.4 keV) flux variability and Ni-K line intensity for Seyfert galaxies, using Suzaku and XMM-Newton archival data. Significant Fe-K line variability of several tens of percent was detected for a pair of observations separated by 1000-2000 days (Cen A, IC 4329 A, NGC 3516, and NGC 4151) and …
Compressible turbulence with slow-mode waves observed in the bursty bulk flow of plasma sheet
Dunlop, M.; Cao, Jinbin; Fu, Huishan +2 more
In this paper, we report the evidence of compressible turbulence with slow-mode waves in a bursty bulk flow of plasma sheet. This compressible turbulence is characterized by a multiscale (1-60 s) anticorrelation between plasma density and magnetic field strength. Besides, the magnetic compressibility spectrum stays nearly constant at all the measu…
The Globular Cluster System of the Coma cD Galaxy NGC 4874 from Hubble Space Telescope ACS and WFC3/IR Imaging
Chies-Santos, Ana L.; Peng, Eric W.; Blakeslee, John P. +4 more
We present new Hubble Space Telescope (HST) optical and near-infrared (NIR) photometry of the rich globular cluster (GC) system NGC 4874, the cD galaxy in the core of the Coma cluster (Abell 1656). NGC 4874 was observed with the HST Advanced Camera for Surveys in the F475W (g 475) and F814W (I 814) passbands and with the Wide…
The Intrinsic Abundance Ratio and X-factor of CO Isotopologues in L 1551 Shielded from FUV Photodissociation
Lai, Shih-Ping; Lin, Sheng-Jun; Nakamura, Fumitaka +10 more
We investigate the intrinsic abundance ratio of 13CO to C18O and the X-factor in L 1551 using the Nobeyama Radio Observatory (NRO) 45 m telescope. L 1551 is chosen because it is relatively isolated in the Taurus molecular cloud shielded from FUV photons, providing an ideal environment for studying the target properties. Our o…
All-sky census of Galactic high-latitude molecular intermediate-velocity clouds
Kerp, J.; Winkel, B.; Lenz, D. +1 more
Context. The H I halo clouds of the Milky Way, and in particular the intermediate-velocity clouds (IVCs), are thought to be connected to Galactic fountain processes. Observations of fountain clouds are important for understanding the role of matter recycling and accretion onto the Galactic disk and subsequent star formation.
Aims: Here, we qu…
Dynamical analysis of the complex radio structure in 3C 293: clues on a rapid jet realignment in X-shaped radio galaxies
Stawarz, Ł.; Weżgowiec, M.; Jamrozy, M. +1 more
Context. Radio galaxies classified as X-shaped/winged, are characterised by two pairs of extended and misaligned lobes, which suggest a rapid realignment of the jet axis, for which a potential cause (including binary supermassive black holes, a black hole merger, or a Lense-Thirring precession) is still under debate.
Aims: Here we analyse the…
The nature of the torus in the heavily obscured AGN Markarian 3: an X-ray study
Harrison, F.; Stern, D.; Bauer, F. E. +22 more
In this paper, we report the results of an X-ray monitoring campaign on the heavily obscured Seyfert galaxy, Markarian 3, carried out between the fall of 2014 and the spring of 2015 with NuSTAR, Suzaku and XMM-Newton. The hard X-ray spectrum of Markarian 3 is variable on all the time-scales probed by our campaign, down to a few days. The observed …
Herschel Observed Stripe 82 Quasars and Their Host Galaxies: Connections between AGN Activity and host Galaxy Star Formation
Wu, Xue-Bing; Dong, X. Y.
In this work, we present a study of 207 quasars selected from the Sloan Digital Sky Survey quasar catalogs and the Herschel Stripe 82 survey. Quasars within this sample are high-luminosity quasars with a mean bolometric luminosity of 1046.4 erg s-1. The redshift range of this sample is within z < 4, with a mean value of 1.…
A Resolved Map of the Infrared Excess in a Lyman Break Galaxy at z = 3
Lehmer, B. D.; Bremer, M.; Kubo, M. +13 more
We have observed the dust continuum of 10 z = 3.1 Lyman break galaxies with the Atacama Large Millimeter/submillimeter Array at ∼450 mas resolution in Band 7. We detect and resolve the 870 µm emission in one of the targets with a flux density of S 870 = 192 ± 57 µJy, and measure a stacked 3σ signal of S 870 = 67 ±…
Stellar laboratories. VII. New Kr iv - vii oscillator strengths and an improved spectral analysis of the hot, hydrogen-deficient DO-type white dwarf RE 0503-289
Hoyer, D.; Rauch, T.; Werner, K. +4 more
Context. For the spectral analysis of high-resolution and high signal-to-noise (S/N) spectra of hot stars, state-of-the-art non-local thermodynamic equilibrium (NLTE) model atmospheres are mandatory. These are strongly dependent on the reliability of the atomic data that is used for their calculation.
Aims: New Kr iv-vii oscillator strengths …