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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 …
Sympathetic Filament Eruptions from a Bipolar Helmet Streamer in the Sun
Yang, Bo; Yang, Jiayan; Bi, Yi +3 more
On 2005 August 5, two solar filaments erupted successively from different confined arcades underlying a common overarching multiple-arcade bipolar helmet streamer. We present detailed observations of these two events and identify them as sympathetic filament eruptions. The first (F1) is a small active-region filament located near the outskirts of …
Chandra and XMM-Newton Studies of the Supernova Remnant G292.2-0.5 Associated with the Pulsar J1119-6127
Safi-Harb, Samar; Gonzalez, Marjorie E.; Kumar, Harsha S.
We present the first detailed imaging and spatially resolved spectroscopic study of the Galactic supernova remnant (SNR) G292.2-0.5, associated with the high-magnetic field radio pulsar (PSR) J1119-6127, using Chandra and XMM-Newton. The high-resolution X-ray images reveal a partially limb-brightened morphology in the west, with diffuse emission c…
IDCS J1426.5+3508: Cosmological Implications of a Massive, Strong Lensing Cluster at z = 1.75
Dey, Arjun; Eisenhardt, Peter R. M.; Gonzalez, Anthony H. +6 more
The galaxy cluster IDCS J1426.5+3508 at z = 1.75 is the most massive galaxy cluster yet discovered at z > 1.4 and the first cluster at this epoch for which the Sunyaev-Zel'Dovich effect has been observed. In this paper, we report on the discovery with Hubble Space Telescope imaging of a giant arc associated with this cluster. The curvature of t…
A Candidate Active Galactic Nucleus with a Pure Soft Thermal X-Ray Spectrum
Ueda, Yoshihiro; Awaki, Hisamitsu; Terashima, Yuichi +2 more
We report the discovery of a candidate active galactic nucleus (AGN), 2XMM J123103.2+110648 at z = 0.13, with an X-ray spectrum represented purely by soft thermal emission reminiscent of Galactic black hole (BH) binaries in the disk-dominated state. This object was found in the second XMM-Newton serendipitous source catalog as a highly variable X-…
Evolution in the Continuum Morphological Properties of Lyα-emitting Galaxies from z = 3.1 to z = 2.1
Gronwall, Caryl; Gawiser, Eric; Ciardullo, Robin +4 more
We present a rest-frame ultraviolet morphological analysis of 108 z ~= 2.1 Lyα emitters (LAEs) in the Extended Chandra Deep Field South and compare it to a similar sample of 171 LAEs at z ~= 3.1. Using Hubble Space Telescope images from the Galaxy Evolution from Morphology and SEDs survey, Great Observatories Origins Deep Survey, and Hubble Ultrad…