Search Publications
The SINS/zC-SINF Survey of z ~ 2Galaxy Kinematics: The Nature of Dispersion-dominated Galaxies
Bouché, Nicolas; Cresci, Giovanni; Genel, Shy +22 more
We analyze the spectra, spatial distributions, and kinematics of Hα, [N II], and [S II] emission in a sample of 38, z ~ 2.2 UV/optically selected star-forming galaxies (SFGs) from the SINS and zC-SINF surveys, 34 of which were observed in the adaptive optics mode of SINFONI and 30 of those contain data presented for the first time here. This is su…
Low-velocity Shocks Traced by Extended SiO Emission along the W43 Ridges: Witnessing the Formation of Young Massive Clusters
Menten, K. M.; Bernard, J. -P.; Martin, P. G. +20 more
The formation of high-mass stars is tightly linked to that of their parental clouds. Here, we focus on the high-density parts of W43, a molecular cloud undergoing an efficient event of star formation. Using a column density image derived from Herschel continuum maps, we identify two high-density filamentary clouds, called the W43-MM1 and W43-MM2 r…
The Velocity Dispersion Profile of NGC 6388 from Resolved-star Spectroscopy: No Evidence of a Central Cusp and New Constraints on the Black Hole Mass
Dalessandro, E.; Massari, D.; Valenti, E. +7 more
By combining high spatial resolution and wide-field spectroscopy performed, respectively, with SINFONI and FLAMES at the ESO/VLT we measured the radial velocities of more than 600 stars in the direction of NGC 6388, a Galactic globular cluster which is suspected to host an intermediate-mass black hole. Approximately 55% of the observed targets tur…
Interstellar medium composition through X-ray spectroscopy of low-mass X-ray binaries
Kaastra, J. S.; Costantini, E.; Pinto, C. +1 more
Context. The diffuse interstellar medium (ISM) is an integral part of the evolution of the entire Galaxy. Metals are produced by stars and their abundances are the direct testimony of the history of stellar evolution. However, the interstellar dust composition is not well known and the total abundances are yet to be accurately determined.
Aim…
Water in star-forming regions with Herschel (WISH). III. Far-infrared cooling lines in low-mass young stellar objects
Liseau, R.; Fedele, D.; van Dishoeck, E. F. +22 more
Context. Understanding the physical phenomena involved in the earlierst stages of protostellar evolution requires knowledge of the heating and cooling processes that occur in the surroundings of a young stellar object. Spatially resolved information from its constituent gas and dust provides the necessary constraints to distinguish between differe…
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…