Search Publications
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…
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…
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…
BeppoSAX Observations of the X-Ray Pulsar MAXI J1409-619 in Low State: Discovery of Cyclotron Resonance Features
Sidoli, Lara; Masetti, Nicola; Frontera, Filippo +2 more
The transient 500 s X-ray pulsar MAXI J1409-619 was discovered by the slit cameras aboard Monitor of All-sky X-ray Image (MAXI) on 2010 October 17, and soon after accurately localized by Swift. We found that the source position was serendipitously observed in 2000 during BeppoSAX observations of the Galactic plane. Two sources are clearly detected…
The Nature of Starbursts. III. The Spatial Distribution of Star Formation
McQuinn, Kristen B. W.; Cannon, John M.; Dolphin, Andrew E. +5 more
We map the spatial distribution of recent star formation over a few × 100 Myr timescales in 15 starburst dwarf galaxies using the location of young blue helium burning stars identified from optically resolved stellar populations in archival Hubble Space Telescope observations. By comparing the star formation histories from both the high surface br…
Magnetic Field Strength in the Upper Solar Corona Using White-light Shock Structures Surrounding Coronal Mass Ejections
Cho, K. -S.; Moon, Y. -J.; Gopalswamy, N. +2 more
To measure the magnetic field strength in the solar corona, we examined 10 fast (>=1000 km s-1) limb coronal mass ejections(CMEs) that show clear shock structures in Solar and Heliospheric Observatory/Large Angle and Spectrometric Coronagraph images. By applying the piston-shock relationship to the observed CME's standoff distance an…
Fermi-LAT Observations and a Broadband Study of Supernova Remnant CTB 109
Slane, Patrick; Castro, Daniel; Ellison, Donald C. +1 more
CTB 109 (G109.1-1.0) is a Galactic supernova remnant (SNR) with a hemispherical shell morphology in X-rays and in the radio band. In this work, we report the detection of γ-ray emission coincident with CTB 109, using 37 months of data from the Large Area Telescope on board the Fermi Gamma-ray Space Telescope. We study the broadband characteristics…
Near-infrared Variability in Young Stars in Cygnus OB7
Wolk, Scott J.; Aspin, Colin; Rice, Thomas S.
We present the first results from a 124 night J, H, K near-infrared monitoring campaign of the dark cloud L 1003 in Cygnus OB7, an active star-forming region. Using three seasons of UKIRT observations spanning 1.5 years, we obtained high-quality photometry on 9200 stars down to J = 17 mag, with photometric uncertainty better than 0.04 mag. On the …