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A Study of Heating and Cooling of the ISM in NGC 1097 with Herschel-PACS and Spitzer-IRS
Helou, G.; Roussel, H.; Murphy, E. J. +38 more
NGC 1097 is a nearby Seyfert 1 galaxy with a bright circumnuclear starburst ring, a strong large-scale bar, and an active nucleus. We present a detailed study of the spatial variation of the far-infrared (FIR) [C II]158 µm and [O I]63 µm lines and mid-infrared H2 emission lines as tracers of gas cooling, and of the polycycli…
An insight in the surroundings of HR 4796
Ehrenreich, D.; Milli, J.; Lacour, S. +8 more
Context. HR 4796 is a young, early A-type star harboring a well structured debris disk, shaped as a ring with sharp inner edges. The inner edge might be shaped by a yet unseen planet inside the ring; the outer one is not well understood. The star forms together with the M-type star HR 4796B, a binary system, with a projected separation of ≃ 560 AU…
Detection of Flux Emergence, Splitting, Merging, and Cancellation of Network Field. I. Splitting and Merging
Hagenaar, H. J.; Iida, Y.; Yokoyama, T.
Frequencies of magnetic patch processes on the supergranule boundary, namely, flux emergence, splitting, merging, and cancellation, are investigated through automatic detection. We use a set of line-of-sight magnetograms taken by the Solar Optical Telescope (SOT) on board the Hinode satellite. We found 1636 positive patches and 1637 negative patch…
Spitzer Search for Dust Disks around Central Stars of Planetary Nebulae
De Marco, Orsola; Chu, You-Hua; Bilíková, Jana +2 more
Two types of dust disks have been discovered around white dwarfs (WDs): small dust disks within the Roche limits of their WDs and large dust disks around hot WDs extending to radial distances of 10-102 AU. The majority of the latter WDs are central stars of planetary nebulae (CSPNs). We have therefore used archival Spitzer Infrared Arra…
AKARI Near-infrared Spectroscopy of Luminous Infrared Galaxies
Lee, Myung Gyoon; Lee, Jong Chul; Hwang, Ho Seong +2 more
We present the AKARI near-infrared (NIR; 2.5-5 µm) spectroscopic study of 36 (ultra)luminous infrared galaxies ((U)LIRGs) at z = 0.01-0.4. We measure the NIR spectral features including the strengths of 3.3 µm polycyclic aromatic hydrocarbon emission and hydrogen recombination lines (Brα and Brβ), optical depths at 3.1 and 3.4 µm…
Constraints on the Faint End of the Quasar Luminosity Function at z ~ 5 in the COSMOS Field
Taniguchi, Y.; Salvato, M.; Morokuma, T. +12 more
We present the result of our low-luminosity quasar survey in the redshift range of 4.5 <~ z <~ 5.5 in the COSMOS field. Using the COSMOS photometric catalog, we selected 15 quasar candidates with 22 < i' < 24 at z ~ 5 that are ~3 mag fainter than the Sloan Digital Sky Survey quasars in the same redshift range. We obtained optical spect…
The ElIXr Galaxy Survey. II. Baryons and Dark Matter in an Isolated Elliptical Galaxy
Humphrey, Philip J.; Buote, David A.; Ponman, Trevor J. +1 more
The Elliptical Isolated X-ray (ElIXr) Galaxy Survey is a volume-limited (<110 Mpc) study of optically selected, isolated, L * elliptical galaxies to provide an X-ray census of galaxy-scale (virial mass, M vir <~ 1013 M ⊙) objects and identify candidates for detailed hydrostatic mass modeling. In th…
Coronal hole boundaries evolution at small scales. III. EIS and SUMER views
Doyle, J. G.; Madjarska, M. S.; Huang, Z. +1 more
Context. We report on the plasma properties of small-scale transient events identified in the quiet Sun, coronal holes and their boundaries.
Aims: We aim at deriving the physical characteristics of events that were identified as small-scale transient brightenings in XRT images.
Methods: We used spectroscopic co-observations from SUMER/So…
Far-IR/Submillimeter Spectroscopic Cosmological Surveys: Predictions of Infrared Line Luminosity Functions for z < 4 Galaxies
Spinoglio, Luigi; Franceschini, Alberto; Gruppioni, Carlotta +3 more
Star formation and accretion onto supermassive black holes in the nuclei of galaxies are the two most energetic processes in the universe, producing the bulk of the observed emission throughout its history. We simulated the luminosity functions of star-forming and active galaxies for spectral lines that are thought to be good spectroscopic tracers…
Kelvin-Helmholtz instability at Saturn's magnetopause: Cassini ion data analysis
Wilson, R. J.; Delamere, P. A.; Bagenal, F. +1 more
On 13 December 2004 Cassini, on approach to Saturn from the dawn flank, crossed the magnetopause multiple times. During these events the plasma spectrometer had a good field of view of both the magnetospheric and magnetosheath plasmas that often flow in nearly opposite directions (compared with more typical orientations that only allow one regime …