Search Publications
The Cool Component and the Dichotomy, Lateral Expansion, and Axial Rotation of Solar X-Ray Jets
Moore, Ronald L.; Sterling, Alphonse C.; Falconer, David A. +1 more
We present results from a study of 54 polar X-ray jets that were observed in coronal X-ray movies from the X-ray Telescope on Hinode and had simultaneous coverage in movies of the cooler transition region (T ~ 105 K) taken in the He II 304 Å band of the Atmospheric Imaging Assembly (AIA) on Solar Dynamics Observatory. These dual observa…
Ultra-luminous X-Ray Sources in the Most Metal Poor Galaxies
Zezas, A.; Roberts, T. P.; Prestwich, A. H. +5 more
Ultra-luminous X-ray sources (ULX) are X-ray binaries with Lx >1039 erg s-1. The most spectacular examples of ULX occur in starburst galaxies and are now understood to be young, luminous high mass X-ray binaries. The conditions under which ULX form are poorly understood, but recent evidence suggests they may be …
Two Mass Distributions in the L 1641 Molecular Clouds: The Herschel Connection of Dense Cores and Filaments in Orion A
Hill, T.; André, Ph.; Arzoumanian, D. +23 more
We present Herschel survey maps of the L 1641 molecular clouds in Orion A. We extracted both the filaments and dense cores in the region. We identified which of the dense sources are proto- or pre-stellar, and studied their association with the identified filaments. We find that although most (71%) of the pre-stellar sources are located on filamen…
Hot X-Ray Coronae around Massive Spiral Galaxies: A Unique Probe of Structure Formation Models
Vogelsberger, Mark; Sijacki, Debora; Churazov, Eugene +8 more
Luminous X-ray gas coronae in the dark matter halos of massive spiral galaxies are a fundamental prediction of structure formation models, yet only a few such coronae have been detected so far. In this paper, we study the hot X-ray coronae beyond the optical disks of two "normal" massive spirals, NGC 1961 and NGC 6753. Based on XMM-Newton X-ray ob…
Observing Coronal Nanoflares in Active Region Moss
Golub, Leon; Testa, Paola; Martínez-Sykora, Juan +12 more
The High-resolution Coronal Imager (Hi-C) has provided Fe XII 193Å images of the upper transition region moss at an unprecedented spatial (~0.''3-0.''4) and temporal (5.5 s) resolution. The Hi-C observations show in some moss regions variability on timescales down to ~15 s, significantly shorter than the minute-scale variability typically found in…
The Stellar Mass Structure of Massive Galaxies from z = 0 to z = 2.5: Surface Density Profiles and Half-mass Radii
van Dokkum, Pieter G.; Franx, Marijn; Illingworth, Garth D. +4 more
We present stellar mass surface density profiles of a mass-selected sample of 177 galaxies at 0.5 < z < 2.5, obtained using very deep Hubble Space Telescope optical and near-infrared data over the GOODS-South field, including recent CANDELS data. Accurate stellar mass surface density profiles have been measured for the first time for a compl…
The Black Hole-Bulge Mass Relation of Active Galactic Nuclei in the Extended Chandra Deep Field-South Survey
Schramm, Malte; Silverman, John D.
We present results from a study to determine whether relations—established in the local universe—between the mass of supermassive black holes (SMBHs) and their host galaxies are in place at higher redshifts. We identify a well-constructed sample of 18 X-ray-selected, broad-line active galactic nuclei (AGNs) in the Extended Chandra Deep Field-South…
ALMA Resolves 30 Doradus: Sub-parsec Molecular Cloud Structure near the Closest Super Star Cluster
Lebouteiller, Vianney; Vasyunina, Tatiana; Hughes, Annie +15 more
We present Atacama Large (sub)Millimeter Array observations of 30 Doradus—the highest resolution view of molecular gas in an extragalactic star formation region to date (~0.4 pc × 0.6 pc). The 30Dor-10 cloud north of R136 was mapped in 12CO 2-1, 13CO 2-1, C18O 2-1, 1.3 mm continuum, the H30α recombination line, and…
Widespread and Hidden Active Galactic Nuclei in Star-forming Galaxies at Redshift >0.3
Dickinson, Mark; Kartaltepe, Jeyhan S.; Kocevski, Dale D. +23 more
We characterize the incidence of active galactic nuclei (AGNs) in 0.3 < z < 1 star-forming galaxies by applying multi-wavelength AGN diagnostics (X-ray, optical, mid-infrared, radio) to a sample of galaxies selected at 70 µm from the Far-Infrared Deep Extragalactic Legacy survey (FIDEL). Given the depth of FIDEL, we detect "normal" gal…
SHARDS: An Optical Spectro-photometric Survey of Distant Galaxies
Barro, Guillermo; Pérez-González, Pablo G.; Tresse, Laurence +26 more
We present the Survey for High-z Absorption Red and Dead Sources (SHARDS), an ESO/GTC Large Program carried out using the OSIRIS instrument on the 10.4 m Gran Telescopio Canarias (GTC). SHARDS is an ultra-deep optical spectro-photometric survey of the GOODS-N field covering 130 arcmin2 at wavelengths between 500 and 950 nm with 24 conti…