Search Publications
Two Types of Magnetic Reconnection in Coronal Bright Points and the Corresponding Magnetic Configuration
Ding, M. D.; Guo, Y.; Chen, P. F. +2 more
Coronal bright points (CBPs) are long-lived small-scale brightenings in the solar corona. They are generally explained by magnetic reconnection. However, the corresponding magnetic configurations are not well understood. We carry out a detailed multi-wavelength analysis of two neighboring CBPs on 2007 March 16, observed in soft X-ray (SXR) and EUV…
Submillimetre photometry of 323 nearby galaxies from the Herschel Reference Survey
Clements, D. L.; Ciesla, L.; Buat, V. +23 more
The Herschel Reference Survey (HRS) is a guaranteed time Herschel key project aimed at studying the physical properties of the interstellar medium in galaxies of the nearby universe. This volume limited, K-band selected sample is composed of galaxies spanning the whole range of morphological types (from ellipticals to late-type spirals) and enviro…
On Absorption by Circumstellar Dust, with the Progenitor of SN 2012aw as a Case Study
Kochanek, C. S.; Dai, X.; Khan, R.
We use the progenitor of SN 2012aw to illustrate the consequences of modeling circumstellar dust using Galactic (interstellar) extinction laws that (1) ignore dust emission in the near-IR and beyond, (2) average over dust compositions, and (3) mischaracterize the optical/UV absorption by assuming that scattered photons are lost to the observer. Th…
[C II] Line Emission in Massive Star-forming Galaxies at z = 4.7
Maiolino, R.; Iono, D.; Walter, F. +20 more
We present Atacama Large Millimeter/submillimeter Array (ALMA) observations of the [C II] 157.7 µm fine structure line and thermal dust continuum emission from a pair of gas-rich galaxies at z = 4.7, BR1202-0725. This system consists of a luminous quasar host galaxy and a bright submillimeter galaxy (SMG), while a fainter star-forming galaxy…
Hubble Space Telescope studies of low-redshift Type Ia supernovae: evolution with redshift and ultraviolet spectral trends
Gal-Yam, A.; Sullivan, M.; Nugent, P. E. +26 more
We present an analysis of the maximum light, near-ultraviolet (NUV; 2900 < λ < 5500 Å) spectra of 32 low-redshift (0.001 < z < 0.08) Type Ia supernovae (SNe Ia), obtained with the Hubble Space Telescope (HST) using the Space Telescope Imaging Spectrograph. We combine this spectroscopic sample with high-quality gri light curves obtained…
The dust properties of bubble H II regions as seen by Herschel
Abergel, A.; Bernard, J. -P.; Hill, T. +10 more
Context. Because of their relatively simple morphology, "bubble" H II regions have been instrumental to our understanding of star formation triggered by H II regions. With the far-infrared (FIR) spectral coverage of the Herschel satellite, we can access the wavelengths where these regions emit the majority of their energy through their dust emissi…
The Evolution of Mass-Size Relation for Lyman Break Galaxies from z = 1 to z = 7
Franx, Marijn; Illingworth, Garth D.; Bouwens, Rychard J. +6 more
For the first time, we study the evolution of the stellar mass-size relation for star-forming galaxies from z ~ 4 to z ~ 7 from Hubble-WFC3/IR camera observations of the HUDF and Early Release Science field. The sizes are measured by determining the best-fit model to galaxy images in the rest-frame 2100 Å with the stellar masses estimated from spe…
The size-luminosity relation at z = 7 in CANDELS and its implication on reionization
Ferguson, H. C.; Giavalisco, M.; McLure, R. J. +15 more
Context. The exploration of the relation between galaxy sizes and other physical parameters (luminosity, mass, star formation rate) has provided important clues for understanding galaxy formation, but such exploration has until recently been limited to intermediate redshift objects.
Aims: We use the currently available CANDELS Deep+Wide surve…
Spectral analysis of 1H 0707-495 with XMM-Newton
Schartel, N.; Santos-Lleó, M.; Ehle, M. +6 more
We present the results of a 500 ks long XMM-Newton observation and a 120 ks long quasi-simultaneous Chandra observation of the Narrow-Line Seyfert 1 galaxy 1H 0707-495 performed in 2010 September. Consistent with earlier results by Fabian et al. and Zoghbi et al., the spectrum is found to be dominated by relativistically broadened reflection featu…
A Double Main Sequence in the Globular Cluster NGC 6397
Anderson, J.; Milone, A. P.; Marino, A. F. +5 more
High-precision multi-band Hubble Space Telescope (HST) photometry reveals that the main sequence of the globular cluster NGC 6397 splits into two components, containing ~30% and ~70% of the stars. This double sequence is consistent with the idea that the cluster hosts two stellar populations: (1) a primordial population that has a composition simi…