Search Publications
Hubble Space Telescope Imaging of Post-starburst Quasars
Canalizo, G.; Shang, Zhaohui; Brotherton, M. S. +7 more
We present images of 29 post-starburst quasars (PSQs) from a Hubble Space Telescope (HST) Advanced Camera for Surveys (ACS) Wide Field Channel Snapshot program. These broadlined active galactic nuclei (AGNs) possess the spectral signatures of massive (M burst ~ 1010 M sun), moderate-aged stellar populations (hundre…
On the relation between plasma escape and the Martian crustal magnetic field
Barabash, S.; Lundin, R.; Yamauchi, M. +2 more
Data from ASPERA-3 on Mars Express is used to study the geographic distribution of ionospheric O+ outflow and escape from Mars. Of particular interest is how the ion outflow relates to the crustal magnetic field regions facing the dayside, flank, and nightside of Mars. The most intense O+ fluxes are generated on the dayside a…
The continuum intensity as a function of magnetic field. I. Active region and quiet Sun magnetic elements
Solanki, S. K.; Borrero, J. M.; Kobel, P.
Context. Small-scale magnetic fields are major contributors to the solar irradiance variations. Hence, the continuum intensity contrast of magnetic elements in the quiet Sun (QS) network and in active region (AR) plage is an essential quantity that needs to be measured reliably.
Aims: By using Hinode/SP disk center data at a constant, high sp…
Herschel discovery of a new class of cold, faint debris discs
Heras, A. M.; Fridlund, M.; Krivov, A. V. +25 more
We present Herschel PACS 100 and 160 µm observations of the solar-type stars α Men, HD 88230 and HD 210277, which form part of the FGK stars sample of the Herschel open time key programme (OTKP) DUNES (DUst around NEarby Stars). Our observations show small infrared excesses at 160 µm for all three stars. HD 210277 also shows a small ex…
COS Observations of Metal Line and Broad Lyman-α Absorption in the Multi-phase O VI and Ne VIII System at z = 0.20701 toward HE 0226-4110
Savage, B. D.; Narayanan, A.; Lehner, N.
Observations of the QSO HE 0226-4110 (z em = 0.495) with the Cosmic Origins Spectrograph (COS) from 1134 to 1796 Å with a resolution of ~17 km s-1 and signal-to-noise ratio (S/N) per resolution element of 20-40 are used to study the multi-phase absorption system at z = 0.20701 containing O VI and Ne VIII. The system was previ…
Early-type Galaxies at z ~ 1.3. III. On the Dependence of Formation Epochs and Star Formation Histories on Stellar Mass and Environment
Ford, H. C.; Demarco, R.; Treu, T. +20 more
We study the environmental dependence of stellar population properties at z ~ 1.3. We derive galaxy properties (stellar masses, ages, and star formation histories) for samples of massive, red, passive early-type galaxies (ETGs) in two high-redshift clusters, RXJ0849+4452 and RXJ0848+4453 (with redshifts of z = 1.26 and 1.27, respectively), and com…
Magnetospheric ULF Waves: A Review
Menk, Frederick W.
A faint optical flash in dust-obscured GRB 080603A: implications for GRB prompt emission mechanisms
Melandri, A.; Bloom, J. S.; Frail, D. A. +23 more
We report the detection of a faint optical flash by the 2-m Faulkes Telescope North simultaneously with the second of two prompt γ-ray pulses in INTEGRAL gamma-ray burst (GRB) 080603A, beginning at trest= 37 s after the onset of the GRB. This optical flash appears to be distinct from the subsequent emerging afterglow emission, for which…
Herschel's view into Mira's head
Blommaert, J. A. D. L.; Jorissen, A.; Ottensamer, R. +9 more
Herschel's PACS instrument observed the environment of the binary system Mira Ceti in the 70 and 160 µm bands. These images reveal bright structures shaped as five broken arcs and fainter filaments in the ejected material of Mira's primary star, the famous AGB star o Ceti. The overall shape of the IR emission around Mira deviates significant…
Star Clusters as Tracers of Interactions in Stephan's Quintet (Hickson Compact Group 92)
Bastian, N.; Konstantopoulos, I. S.; Gallagher, S. C. +5 more
Stephan's Quintet (SQ; also known as Hickson Compact Group 92) is a compact group of galaxies that exhibits numerous signs of interactions between its members. Using high-resolution (0farcs04 per pixel) images of SQ in B 438, V 606, and I 814 bands from the Early Release Science project obtained with the Wide Field…