Search Publications
The cataclysmic variable SDSS J1507+52: an eclipsing period bouncer in the Galactic halo
Uthas, Helena; Long, Knox S.; Thorstensen, John +2 more
SDSS J1507+52 is an eclipsing cataclysmic variable (CV) consisting of a cool, non-radially pulsating white dwarf and an unusually small substellar secondary. The system has a high space velocity and a very short orbital period of about 67 min, well below the usual minimum period for CVs. To explain the existence of this peculiar system, two theori…
Hubble Space Telescope Studies of Nearby Type Ia Supernovae: The Mean Maximum Light Ultraviolet Spectrum and its Dispersion
Cenko, S. Bradley; Law, Nicholas M.; Ellis, Richard S. +11 more
We present the first results of an ongoing campaign using the STIS spectrograph on board the Hubble Space Telescope (HST), whose primary goal is the study of near-ultraviolet (UV) spectra of local Type Ia supernovae (SNe Ia). Using events identified by the Palomar Transient Factory and subsequently verified by ground-based spectroscopy, we demonst…
Scattering function for energetic neutral hydrogen atoms off the lunar surface
Barabash, S.; Holmström, M.; Futaana, Y. +7 more
The Sub-keV Atom Reflecting Analyzer instrument on board the lunar orbiter Chandrayaan-1 provided a large number of measurements of lunar energetic neutral atoms (ENAs). These ENAs were formerly solar wind ions, which were neutralized and backscattered from the lunar surface. The angles under which the ENAs are scattered strongly depend on the sol…
The Magellanic Quasars Survey. I. Doubling the Number of Known Active Galactic Nuclei Behind the Small Magellanic Cloud
Udalski, Andrzej; Kozłowski, Szymon; Kochanek, Christopher S.
We report the spectroscopic confirmation of 29 new, 12 plausible, and three previously known quasars behind the central ~1.5 deg2 region of the Small Magellanic Cloud (SMC). These were identified in a single 2DF/AAOMEGA observation on the Anglo-Australian Telescope of 268 candidates selected primarily based on their mid-IR colors, along…
An XMM-Newton view of the `bare' nucleus of Fairall 9
Papadakis, I. E.; Bianchi, S.; Emmanoulopoulos, D. +3 more
We present the spectral results from a 130-ks observation, obtained from the X-ray Multi-Mirror Mission-Newton (XMM-Newton) observatory, of the type I Seyfert galaxy Fairall 9. An X-ray hardness ratio analysis of the light curves reveals a ‘softer-when-brighter’ behaviour which is typical of radio-quiet type I Seyfert galaxies. Moreover, we analys…
Observations of water vapour and carbon monoxide in the Martian atmosphere with the SWC of PFS/MEX
Sindoni, G.; Geminale, A.; Formisano, V.
In the history of Mars exploration its atmosphere and planetary climatology aroused particular interest. In the study of the minor gases abundance in the Martian atmosphere, water vapour became especially important, both because it is the most variable trace gas, and because it is involved in several processes characterizing the planetary atmosphe…
A spectroscopic investigation of early-type stars in the young open cluster Westerlund 2
Nazé, Y.; Rauw, G.; Sana, H.
Context. The distance of the very young open cluster
Aims: We attempt a joint analysis of spectroscopic and photometric data of eclipsing binaries in the clus…
Arp 220: Extinction and Merger-induced Star Formation
Genzel, R.; Sturm, E.; Tacconi, L. J. +3 more
We analyze new spatially resolved integral field spectroscopic H- and K-band data at a resolution of 0farcs3 (100 pc) and reanalyze interferometric CO(2-1) line observations of the prototypical merging system Arp 220. We find that the majority of the K-band luminosity is due to a 10 Myr old starburst, with a significant contribution from an underl…
Eclipses during the 2010 Eruption of the Recurrent Nova U Scorpii
Maehara, Hiroyuki; Schaefer, Bradley E.; Worters, Hannah L. +34 more
The eruption of the recurrent nova U Scorpii on 2010 January 28 is now the all-time best observed nova event. We report 36,776 magnitudes throughout its 67 day eruption, for an average of one measure every 2.6 minutes. This unique and unprecedented coverage is the first time that a nova has had any substantial amount of fast photometry. With this,…
Dissecting the colour-magnitude diagram: a homogeneous catalogue of stellar populations in globular clusters
Sills, Alison; Knigge, Christian; Leigh, Nathan
We present a homogeneous catalogue for blue straggler, red giant branch, horizontal branch and main-sequence turn-off stars in a sample of 35 clusters taken from the Advanced Camera for Surveys (ACS) Survey for Globular Clusters. As a result of the superior photometry and relatively large field of view offered by the ACS data, this new catalogue i…