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The Interplanetary Responses to the Great Solar Activities in Late October 2003
Wang, Yuming; Wang, Jingxiu; Wang, S. +4 more
Based on the observations of the Sun and the interplanetary medium, a series of solar activities in late October 2003 and their consequences are studied comprehensively. Thirteen X-ray flares with importance greater than M-class, six frontside halo coronal mass ejections (CMEs) with span angle larger than 100∘ and three associated erupt…
The ISO-2MASS AGN survey: on the type-1 sources
Cesarsky, C.; Siebenmorgen, R.; Haas, M. +9 more
We combined the ISOCAM Parallel Mode Survey at 6.7 µm (LW2 filter) with the Two Micron All Sky Survey in order to obtain a powerful tool to search for AGN independent of dust extinction. Using moderate colour criteria H-K>0.5 and K-LW2>2.7 we have selected a sample of 77 AGN candidates in an effective area of ~10 square degrees. By mea…
A new model of total solar irradiance based on sunspot areas
Walton, Stephen R.; Preminger, Dora G.
We show that daily sunspot area can be used in a simple model to reconstruct daily variations in the total solar irradiance, S. The model assumes that all fluctuations in S are correlated with the emergence of sunspots on the solar disk. Cotemporal data for S and sunspot area are analysed to extract the finite impulse response function that descri…
The Evolution of Stellar Mass in Galaxies in the NICMOS Ultra Deep Field
Gwyn, S. D. J.; Hartwick, F. D. A.
We measure the buildup of the stellar mass of galaxies from z=6 down to z=1. Using 15 band multicolor imaging data in the NICMOS Ultra Deep Field we derive photometric redshifts and masses for 796 galaxies down to HAB=26.5 mag. The derived evolution of the global stellar mass density of galaxies is consistent with previous star formatio…
Absolute spectrophotometry of northern compact planetary nebulae
Corradi, R. L. M.; Wright, S. A.; Perinotto, M.
We present medium-dispersion spectra and narrowband images of six northern compact planetary nebulae (PNe):
A Chandra Observation of the Nearby Lenticular Galaxy NGC 5102: Where are the X-Ray Binaries?
Ponman, T. J.; Jones, C.; Kraft, R. P. +2 more
We present results from a 34 ks Chandra ACIS-S observation of the low-mass X-ray binary (LMXB) population and the hot interstellar medium (ISM) in the nearby (d=3.1 Mpc) lenticular galaxy NGC 5102, previously shown to have an unusually low X-ray luminosity. We detect 11 X-ray point sources within the D25 optical boundary of the galaxy (…
Deep Photometry of the Globular Cluster M5: Distance Estimates from White Dwarf and Main-Sequence Stars
Sarajedini, Ata; Layden, Andrew C.; Cool, Adrienne M. +1 more
We present deep VI photometry of stars in the globular cluster M5 (NGC 5904) based on images taken with the Hubble Space Telescope. The resulting color-magnitude diagram reaches below V~27 mag, revealing the upper 2-3 mag of the white dwarf cooling sequence and main-sequence stars 8 mag and more below the turnoff. We fit the main sequence to subdw…
A Study of Flare-associated X-Ray Plasma Ejections. III. Kinematic Properties
Cho, K. -S.; Moon, Y. -J.; Park, Y. D. +2 more
In this study, we have investigated the kinematic properties of flare-associated X-ray plasma ejections. First, we obtained the speed profiles of well-observed several events and compared them with the GOES soft X-ray flux profiles as well as the HXT hard X-ray flux profiles of their associated flares. Second, we have estimated the Alfvén speed at…
Early signatures of large-scale field line opening. Multi-wavelength analysis of features connected with a "halo" CME event
Vilmer, N.; Pohjolainen, S.; Khan, J. I. +1 more
A fast "halo"-type coronal mass ejection (CME) associated with a two-ribbon flare, GOES class M 1.3, was observed on February 8, 2000. Soft X-ray and EUV images revealed several loop ejections and one wave-like moving front that started from a remote location, away from the flare core region. A radio type-II burst was observed near the trajectory …
Toward magnetic field dissipation during the 23 July 2002 solar flare measured with Solar and Heliospheric Observatory/Michelson Doppler Imager (SOHO/MDI) and Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI)
Zharkova, Valentina V.; Zharkov, Sergey I.; Ipson, Stanley S. +1 more
We analyze the SOHO/MDI high-cadence magnetic field variations that occurred in a bipolar area around the apparent neutral line (ANL) prior to and during the 2B/X4.8 flare on 23 July 2002 and their association with the hard X-ray (HXR) and Hα emission observed with RHESSI and BBSO. Magnetic field changes started 6 min prior to the hard …