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Energetic feedback and 26Al from massive stars and their supernovae in the Carina region
Hartmann, D. H.; Preibisch, T.; Diehl, R. +3 more
Aims: We study the populations of massive stars in the Carina region and their energetic feedback and ejection of 26Al.
Methods: We did a census of the stellar populations in young stellar clusters within a few degrees of the Carina nebula. For each star we estimated the mass, based on the spectral type and the host cluster ag…
Herschel/HIFI observations of CO, H2O and NH3 in Monoceros R2
Le Bourlot, J.; Le Petit, F.; Ossenkopf, V. +12 more
Context. Mon R2, at a distance of 830 pc, is the only ultracompact H ii region (UCH ii) where the associated photon-dominated region (PDR) can be resolved with Herschel. Owing to its brightness and proximity, it is one of the best-suited sources for investigating the chemistry and physics of highly UV-irradiated PDRs.
Aims: Our goal is to est…
Uncovering the Birth of a Coronal Mass Ejection from Two-Viewpoint SECCHI Observations
Tsinganos, K.; Vourlidas, A.; Syntelis, P.
We investigate the initiation and formation of Coronal Mass Ejections (CMEs) via a detailed two-viewpoint analysis of low corona observations of a relatively fast CME acquired by the SECCHI instruments aboard the STEREO mission. The event which occurred on 2 January 2008, was chosen because of several unique characteristics. It shows upward motion…
Sound-speed Inversion of the Sun Using a Nonlocal Statistical Convection Theory
Deng, Licai; Christensen-Dalsgaard, Jørgen; Zhang, Chunguang +1 more
Helioseismic inversions reveal a major discrepancy in sound speed between the Sun and the standard solar model just below the base of the solar convection zone. We demonstrate that this discrepancy is caused by the inherent shortcomings of the local mixing-length theory adopted in the standard solar model. Using a self-consistent nonlocal convecti…
The distribution of Titan's high-altitude (out to ∼50,000 km) exosphere from energetic neutral atom (ENA) measurements by Cassini/INCA
Dandouras, I.; Garnier, P.; Krimigis, S. M. +3 more
We report observations of Titan's high-altitude exosphere detected out to about 50,000 km altitude. The observations were made by the Ion Neutral Camera (INCA) on board the Cassini spacecraft. INCA detects energetic neutral atoms (ENA) that are formed when the ambient magnetospheric ions charge exchange with Titan's neutral atmosphere and exospher…
Possible Detection of an Emission Cyclotron Resonance Scattering Feature from the Accretion-powered Pulsar 4U 1626-67
Mihara, T.; Tashiro, M. S.; Yamada, S. +7 more
We present analysis of 4U 1626-67, a 7.7 s pulsar in a low-mass X-ray binary system, observed with the hard X-ray detector of the Japanese X-ray satellite Suzaku in 2006 March for a net exposure of ~88 ks. The source was detected at an average 10-60 keV flux of ~4 × 10-10 erg cm-2 s-1. The phase-averaged spectrum i…
Exploring X-ray and radio emission of type 1 AGN up to z ~ 2.3
Ballo, L.; Barcons, X.; Carrera, F. J. +1 more
Context. X-ray emission from active galactic nuclei (AGN) is dominated by the accretion disk around a supermassive black hole. The radio luminosity, however, has not such a clear origin except in the most powerful sources where jets are evident. The origin (and even the very existence) of the local bi-modal distribution in radio-loudness is also a…
Herschel-PACS far-infrared detections of Lyman-α emitters at 2.0 ≲ z ≲ 3.5
Berta, S.; Magnelli, B.; Lutz, D. +23 more
In this work we analyse the physical properties of a sample of 56 spectroscopically selected star-forming (SF) Lyα emitting galaxies at 2.0 ≲ z ≲ 3.5 using both a spectral energy distribution (SED) fitting procedure from rest-frame UV to mid-IR and direct 160 µm FIR observations taken with the Photodetector Array Camera and Spectrometer (PAC…
Probing the M_BH-σ* Relation in the Non-local Universe Using Red QSOs
Lacy, Mark; Canalizo, Gabriela; Hiner, Kyle D. +3 more
We describe a method to measure the M_BH-σ* relation in the non-local universe using dust-obscured QSOs. We present results from a pilot sample of nine Two Micron All Sky Survey red QSOs with redshifts 0.14 < z < 0.37. We find that there is an offset (0.8 dex, on average) between the position of our objects and the local relation …
Late-time Light Curves of Type II Supernovae: Physical Properties of Supernovae and Their Environment
Barlow, Michael J.; Panagia, Nino; Meixner, Margaret +9 more
We present BVRIJHK-band photometry of six core-collapse supernovae, SNe 1999bw, 2002hh, 2003gd, 2004et, 2005cs, and 2006bc, measured at late epochs (>2 yr) based on the Hubble Space Telescope (HST), and the Gemini North, and WIYN telescopes. We also show the JHK light curves of supernova impostor SN 2008S up to day 575 because it was serendipit…