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Future of X-ray reverberation from AGN
Fabian, A. C.; Uttley, P.; Cackett, E. M. +3 more
XMM-Newton is capable of making a transformational advance in our understanding of how luminous accreting black holes work, by dedicating about 10% of future observing time to long observations, of order megaseconds, to X-ray variable active galactic nuclei (AGN) research. This would enable reverberation studies, already a commonplace feature of A…
Star Formation Conditions in a Planck Galactic Cold Clump, G108.84-00.81
Kim, Kee-Tae; Lee, Jeong-Eun; Liu, Tie +6 more
We present the results from a series of ground-based radio observations toward a Planck Galactic Cold Clump (PGCC), PGCC G108.84-00.81, which is located in one curved filamentary cloud in the vicinity of an extended H II region Sh2-152 and SNR G109.1-1.0. PGCC G108.84-00.81 is mainly composed of two clumps, “G108-N” and “G108-S”. In the 850 µ…
An Early Diagnostics of the Geoeffectiveness of Solar Eruptions from Photospheric Magnetic Flux Observations: The Transition from SOHO to SDO
Grechnev, V. V.; Chertok, I. M.; Abunin, A. A.
In our previous articles (Chertok et al. in Solar Phys. 282, 175, 2013; Chertok et al. in Solar Phys. 290, 627, 2015), we presented a preliminary tool for the early diagnostics of the geoeffectiveness of solar eruptions based on the estimate of the total unsigned line-of-sight photospheric magnetic flux in accompanying extreme ultraviolet (EUV) ar…
Optimizing future experiments of cosmic far-infrared background: a principal component approach
Wu, Hao-Yi; Doré, Olivier
The anisotropies of cosmic far-infrared background (CFIRB) probe the star formation rate (SFR) of dusty star-forming galaxies as a function of dark matter halo mass and redshift. We explore how future CFIRB experiments can optimally improve the SFR constraints beyond the current measurements of Planck. We introduce a model-independent, piecewise p…
"TNOs are Cool": A survey of the trans-Neptunian region. XII. Thermal light curves of Haumea, 2003 VS2 and 2003 AZ84 with Herschel/PACS
Jorda, L.; Fornasier, S.; Groussin, O. +10 more
Context. Time series observations of the dwarf planet Haumea and the Plutinos 2003 VS2 and 2003 AZ84 with Herschel/PACS are presented in this work. Thermal emission of these trans-Neptunian objects (TNOs) were acquired as part of the "TNOs are Cool" Herschel Space Observatory key programme.
Aims: We search for the therma…
The Carnegie-Chicago Hubble Program: Discovery of the Most Distant Ultra-faint Dwarf Galaxy in the Local Universe
Lee, Myung Gyoon; Jang, In Sung; Seibert, Mark +3 more
Ultra-faint dwarf galaxies (UFDs) are the faintest known galaxies, and due to their incredibly low surface brightness, it is difficult to find them beyond the Local Group. We report a serendipitous discovery of a UFD, Fornax UFD1, in the outskirts of NGC 1316, a giant galaxy in the Fornax cluster. The new galaxy is located at a projected radius of…
Shock aurora: Field-aligned discrete structures moving along the dawnside oval
Zhou, Xiaoyan; Haerendel, Gerhard; Moen, Jøran I. +5 more
Generated by interplanetary shocks or solar wind pressure pulses, shock aurora has transient, global, and dynamic significances and provides a direct manifestation of the solar wind-magnetosphere-ionosphere interaction. As a part of a series of studies of the shock aurora, this paper focuses on the interaction at the morning magnetopause and its a…
HST Detection of Extended Neutral Hydrogen in a Massive Elliptical at z = 0.4
Zahedy, Fakhri S.; Chen, Hsiao-Wen; Rauch, Michael +1 more
We report the first detection of extended neutral hydrogen (H I) gas in the interstellar medium (ISM) of a massive elliptical galaxy beyond z∼ 0. The observations utilize the doubly lensed images of QSO HE 0047-1756 at {z}{QSO}=1.676 as absorption-line probes of the ISM in the massive ({M}{star}≈ {10}11 {M}⊙ <…
Insights on star-formation histories and physical properties of 1.2 ≤z ≲ 4 Herschel-detected galaxies
Elbaz, D.; Schaerer, D.; Pannella, M. +3 more
Aims: We aim to test the impact of using variable star-forming histories (SFHs) and the IR luminosity as a constrain on the physical parameters of high redshift dusty star-forming galaxies. We explore in particular the properties (SFHs, ages, timescales) of galaxies depending on their belonging to the "main sequence" of star-forming galaxies …
An isolated, bright cusp aurora at Saturn
Baines, K. H.; Dougherty, M. K.; Gray, R. L. +16 more
Saturn's dayside aurora displays a number of morphological features poleward of the main emission region. We present an unusual morphology captured by the Hubble Space Telescope on 14 June 2014 (day 165), where for 2 h, Saturn's FUV aurora faded almost entirely, with the exception of a distinct emission spot at high latitude. The spot remained fix…