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SN2014J gamma rays from the 56Ni decay chain
Wang, Wei; Diehl, Roland; Greiner, Jochen +7 more
Context. The detection and measurement of gamma-ray lines from the decay chain of 56Ni provides unique information about the explosion in supernovae. SN2014J at 3.3 Mpc is a sufficiently-nearby supernova of type Ia so that such measurements have been feasible with the gamma-ray spectrometer SPI on ESA's INTEGRAL gamma-ray observatory. <…
Broadband Observations of the Compton-thick Nucleus of NGC 3393
Harrison, F. A.; Stern, D.; Treister, E. +16 more
We present new Nuclear Spectroscopic Telescope Array (NuSTAR ) and Chandra observations of NGC 3393, a galaxy reported to host the smallest separation dual active galactic nuclei (AGN) resolved in the X-rays. While past results suggested a 150 pc separation dual AGN, three times deeper Chandra imaging, combined with adaptive optics and radio imagi…
The systematic search for z ≳ 5 active galactic nuclei in the Chandra Deep Field South
Schawinski, Kevin; Koss, Michael; Weigel, Anna K. +3 more
We investigate early black hole (BH) growth through the methodical search for z ≳ 5 active galactic nuclei (AGN) in the Chandra Deep Field South. We base our search on the Chandra 4-Ms data with flux limits of 9.1 × 10-18 (soft, 0.5-2 keV) and 5.5 × 10-17 erg s-1 cm-2 (hard, 2-8 keV). At z ∼ 5, this corr…
Hubble Space Telescope and HI Imaging of Strong Ram Pressure Stripping in the Coma Spiral NGC 4921: Dense Cloud Decoupling and Evidence for Magnetic Binding in the ISM
Kenney, Jeffrey D. P.; Abramson, Anne; Bravo-Alfaro, Hector
Remarkable dust extinction features in the deep Hubble Space Telescope (HST) V and I images of the face-on Coma cluster spiral galaxy NGC 4921 show in unprecedented ways how ram pressure strips the ISM from the disk of a spiral galaxy. New VLA HI maps show a truncated and highly asymmetric HI disk with a compressed HI distribution in the NW, provi…
Investigating Hα, UV, and IR Star-formation Rate Diagnostics for a Large Sample of z ∼ 2 Galaxies
Shapley, Alice E.; Steidel, Charles C.; Reddy, Naveen A. +1 more
We use a sample of 262 spectroscopically confirmed star-forming galaxies at redshifts 2.08≤slant z≤slant 2.51 to compare Hα, ultraviolet (UV), and IR star formation rate (SFR) diagnostics and to investigate the dust properties of the galaxies. At these redshifts, the Hα line shifts to the {{K}s} band. By comparing {{K}s}-band…
Mars' water vapor mapping by the SPICAM IR spectrometer: Five martian years of observations
Montmessin, Franck; Trokhimovskiy, Alexander; Bertaux, Jean-Loup +4 more
The SPICAM IR instrument on the Mars Express mission continuously observes the water vapor in the martian atmosphere starting from 2004 in the 1.38-µm spectral band. The water vapor column abundance is retrieved from nadir observations to characterize its spatial, seasonal and interannual variations. A reference set of SPICAM water vapor col…
A near-infrared spectroscopic survey of massive jets towards extended green objects
Sanna, A.; Stecklum, B.; Linz, H. +2 more
Context. Protostellar jets and outflows are the main outcome of the star formation process, and their analysis can provide us with major clues about the ejection and accretion history of young stellar objects (YSOs).
Aims: We aim at deriving the main physical properties of massive jets from near-infrared (NIR) observations, comparing them to …
Revisiting the rigidly rotating magnetosphere model for σ Ori E - II. Magnetic Doppler imaging, arbitrary field RRM, and light variability
Owocki, S. P.; Wade, G. A.; Kochukhov, O. +6 more
The initial success of the Rigidly Rotating Magnetosphere (RRM) model application to the B2Vp star σ Ori E by Townsend, Owocki & Groote triggered a renewed era of observational monitoring of this archetypal object. We utilize high-resolution spectropolarimetry and the magnetic Doppler imaging (MDI) technique to simultaneously determine the mag…
The nature and origin of substructure in the outskirts of M31 - II. Detailed star formation histories
Lewis, Geraint F.; McConnachie, Alan W.; Ibata, Rodrigo A. +9 more
While wide-field surveys of M31 have revealed much substructure at large radii, understanding the nature and origin of this material is not straightforward from morphology alone. Using deep Hubble Space Telescope/Advanced Camera for Surveys data, we have derived further constraints in the form of quantitative star formation histories (SFHs) for 14…
The Grism Lens-Amplified Survey from Space (GLASS). II. Gas-Phase Metallicity and Radial Gradients in an Interacting System At Z ≃ 2
Malkan, M. A.; Bradač, M.; Treu, T. +8 more
We present spatially resolved gas-phase metallicity for a system of three galaxies at z = 1.85 detected in the Grism Lens-Amplified Survey from Space (GLASS). The combination of Hubble Space Telescope (HST’s) diffraction limit and strong gravitational lensing by the cluster MACS J0717+3745 results in a spatial resolution of ≃200-300 pc, enabling g…