Search Publications
PTF10ops - a subluminous, normal-width light curve Type Ia supernova in the middle of nowhere
Cenko, S. B.; Bloom, J. S.; Gal-Yam, A. +26 more
PTF10ops is a Type Ia supernova (SN Ia), whose light curve and spectral properties place it outside the current SN Ia subtype classifications. Its spectra display the characteristic lines of subluminous SNe Ia, but it has a normal-width light curve with a long rise time, typical of normal-luminosity SNe Ia. The early-time optical spectra of PTF10o…
Revisiting the Abundance Gradient in the Maser Host Galaxy NGC 4258
Bresolin, Fabio
New spectroscopic observations of 36 H II regions in NGC 4258 obtained with the Gemini telescope are combined with existing data from the literature to measure the radial oxygen abundance gradient in this galaxy. The [O III]λ4363 auroral line was detected in four of the outermost targets (17-22 kpc from the galaxy center), allowing a determination…
Radio to infrared spectra of late-type galaxies with Planck and Wilkinson Microwave Anisotropy Probe data
Clements, D. L.; Davies, R. D.; Dickinson, C. +2 more
We use the Planck Early Release Compact Source Catalogue combined with Wilkinson Microwave Anisotropy Probe (WMAP) and other archival measurements to construct continuum spectra of three nearby dusty star-forming galaxies: Messier 82, NGC 253 and NGC 4945. We carry out a least-squares fit to the spectra using a combination of simple synchrotron, f…
GOODS-Herschel: a population of 24 µm dropout sources at z < 2
Magnelli, B.; Lutz, D.; Altieri, B. +25 more
Using extremely deep PACS 100- and 160 µm Herschel data from the GOODS-Herschel program, we identify 21 infrared bright galaxies previously missed in the deepest 24 µm surveys performed by Spitzer/MIPS. These MIPS dropouts are predominantly found in two redshift bins, centred at z ~ 0.4 and ~1.3. Their S100/S24 fl…
A Study of the X-rayed Outflow of APM 08279+5255 through Photoionization Codes
Chartas, George; Saez, Cristian
We present new results from our study of the X-rayed outflow of the z = 3.91 gravitationally lensed broad absorption line quasar APM 08279+5255. These results are based on spectral fits to all the long exposure observations of APM 08279+5255 using a new quasar-outflow model. This model is based on CLOUDY 3 CLOUDY is a photoionization co…
Wide-field VLBA observations of the Chandra deep field South
Deller, A.; Lenc, E.; Morgan, J. +7 more
Context. Wide-field surveys are a commonly-used method for studying thousands of objects simultaneously, to investigate, e.g., the joint evolution of star-forming galaxies and active galactic nuclei. Very long baseline interferometry (VLBI) observations can yield valuable input for such studies because they are able to identify AGN unambiguously i…
Overview of an extensive multi-wavelength study of GX 339-4 during the 2010 outburst
D'Avanzo, P.; Goldoni, P.; Rahoui, F. +8 more
Context. The microquasar GX 339-4 experienced a new outburst in 2010: it was observed simultaneously at various wavelengths from radio up to soft γ-rays. We focus on observations that are quasi-simultaneous with those made with the INTEGRAL and RXTE satellites: these were collected in 2010 March-April during our INTEGRAL target of opportunity prog…
The Gas Dynamics of NGC 4472 Revealed by XMM-Newton
Hardcastle, M. J.; Sivakoff, G. R.; Sarazin, C. L. +6 more
We present results from a 100 ks XMM-Newton observation of the hot gas in the Virgo cluster elliptical galaxy NGC 4472. We find a surface brightness discontinuity ~21 kpc north of the nucleus, consistent with being a contact discontinuity between two moving fluids. We also detect a >60 kpc long ram-pressure stripped tail. The pressure across th…
Herschel observations of the Centaurus cluster - the dynamics of cold gas in a cool core
Böhringer, H.; Fabian, A. C.; Combes, F. +15 more
Brightest cluster galaxies (BCGs) in the cores of galaxy clusters have distinctly different properties from other low-redshift massive ellipticals. The majority of the BCGs in cool-core clusters show signs of active star formation. We present observations of NGC 4696, the BCG of the Centaurus galaxy cluster, at far-infrared (FIR) wavelengths with …
Ice sublimation as a geomorphic process: A planetary perspective
Mangold, Nicolas
Sublimation plays a role in the shaping of landforms of planetary surfaces where ice is present as frost, as polar caps, or in the subsurface. This review is focused primarily on the geomorphologic consequences of sublimation. A summary of the suite of landforms that have been observed on the surface of various planetary bodies and whose formation…