Search Publications
Helioseismology of Pre-emerging Active Regions. I. Overview, Data, and Target Selection Criteria
Leka, K. D.; Barnes, G.; Birch, A. C. +4 more
This first paper in a series describes the design of a study testing whether pre-appearance signatures of solar magnetic active regions were detectable using various tools of local helioseismology. The ultimate goal is to understand flux-emergence mechanisms by setting observational constraints on pre-appearance subsurface changes, for comparison …
The Ages of High-mass X-Ray Binaries in NGC 2403 and NGC 300
Williams, Benjamin F.; Dolphin, Andrew; Eracleous, Michael +2 more
We have examined resolved stellar photometry from HST imaging surrounding 18 high-mass X-ray binary (HMXB) candidates in NGC 300 and NGC 2403 as determined from combined Chandra/HST analysis. We have fit the color-magnitude distribution of the surrounding stars with stellar evolution models. All but one region in NGC 300 and two in NGC 2403 contai…
A Hi-GAL study of the high-mass star-forming region G29.96-0.02
Testi, L.; Elia, D.; Schisano, E. +9 more
Context. G29.96-0.02 is a high-mass star-forming cloud observed at 70, 160, 250, 350, and 500 µm as part of the Herschel survey of the Galactic plane (Hi-GAL) during the science demonstration phase.
Aims: We wish to conduct a far-infrared study of the sources associated with this star-forming region by estimating their physical properti…
Green Galaxies in the COSMOS Field
Kong, Xu; Pan, Zhizheng; Fan, Lulu
We present research on the morphologies, spectra, and environments of ≈2350 "green valley" galaxies at 0.2 < z < 1.0 in the COSMOS field. The bimodality of dust-corrected NUV-r + color is used to define "green valley"; it removes dusty star-forming galaxies from galaxies that are truly transitioning between the blue cloud and the …
The Discrepant Kinematics of ORLs and CELs in NGC 7009 as a Function of Ionization Structure
Richer, Michael G.; Georgiev, Leonid; Arrieta, Anabel +1 more
We present spatially and velocity-resolved echelle spectroscopy for NGC 7009 obtained with the UVES spectrograph at the European Southern Observatory's Very Large Telescope. Our objective is to analyze the kinematics of emission lines excited by recombination and collisions with electrons to determine whether similarities or differences could be u…
A Deep Search for Faint Galaxies Associated with Very Low-redshift C IV Absorbers: A Case with Cold-accretion Characteristics
Tripp, Todd M.; Prochaska, J. Xavier; Davé, Romeel +4 more
Studies of QSO absorber-galaxy connections are often hindered by inadequate information on whether faint/dwarf galaxies are located near the QSO sight lines. To investigate the contribution of faint galaxies to QSO absorber populations, we are conducting a deep galaxy redshift survey near low-z C IV absorbers. Here we report a blindly detected C I…
Exploring the circumstellar environment of the young eruptive star V2492 Cygni
Pál, A.; Mészáros, Sz.; Ábrahám, P. +20 more
Context. V2492 Cyg is a young eruptive star that went into outburst in 2010. The near-infrared color changes observed since the outburst peak suggest that the source belongs to a newly defined sub-class of young eruptive stars, where time-dependent accretion and variable line-of-sight extinction play a combined role in the flux changes.
Aims:…
Herschel Reveals Massive Cold Clumps in NGC 7538
Bernard, J. -P.; Martin, P. G.; Hill, T. +30 more
We present the first overview of the Herschel observations of the nearby high-mass star-forming region NGC 7538, taken as part of the Herschel imaging study of OB young stellar objects (HOBYS) Key Programme. These PACS and SPIRE maps cover an approximate area of one square degree at five submillimeter and far-infrared wavebands. We have identified…
An extended Herschel drop-out source in the center of AS1063: a normal dusty galaxy at z = 6.1 or SZ substructures?
Smail, I.; Kneib, J. -P.; Lutz, D. +23 more
In the course of our 870 µm APEX/LABOCA follow-up of the Herschel Lensing Survey we have detected a source in AS1063 (RXC J2248.7-4431) that has no counterparts in any of the Herschel PACS/SPIRE bands, it is a Herschel "drop-out" with S870/S500 ≥ 0.5. The 870 µm emission is extended and centered on the brightest c…
The Existence and Nature of the Interstellar Bow Shock
Ben-Jaffel, Lotfi; Grygorczuk, J.; Strumik, M. +1 more
We report a new diagnosis of two different states of the local interstellar medium (LISM) near our solar system by using a sensitivity study constrained by several distinct and complementary observations of the LISM, solar wind, and inner heliosphere. Assuming the Interstellar Boundary Explorer (IBEX) He flow parameters for the LISM, we obtain a s…