Search Publications
Metal distribution in sloshing galaxy clusters: the case of A496
Molendi, Silvano; Ghizzardi, Simona; De Grandi, Sabrina
We report results from a detailed study of the sloshing gas in the core of A496. We detected the low-temperature/entropy spiral feature found in several cores. We also found that conduction between the gas in the spiral and the ambient medium must be suppressed by more than one order of magnitude compared with the Spitzer conductivity. Intriguingl…
An X-ray view of the very faint black hole X-ray transient Swift J1357.2-0933 during its 2011 outburst
Altamirano, D.; Degenaar, N.; Wijnands, R. +3 more
We report on the X-ray spectral (using XMM-Newton data) and timing behaviour [using XMM-Newton and Rossi X-ray Timing Explorer (RXTE) data] of the very faint X-ray transient and black hole system Swift J1357.2-0933 during its 2011 outburst. The XMM-Newton X-ray spectrum of this source can be adequately fitted with a soft thermal component with a t…
Mapping Compound Cosmic Telescopes Containing Multiple Projected Cluster-scale Halos
Zabludoff, Ann I.; Keeton, Charles R.; Wong, Kenneth C. +1 more
Lines of sight with multiple projected cluster-scale gravitational lenses have high total masses and complex lens plane interactions that can boost the area of magnification, or étendue, making detection of faint background sources more likely than elsewhere. To identify these new "compound" cosmic telescopes, we have found directions in the sky w…
Applying an Automatic Image-Processing Method to Synoptic Observations
Tlatov, Andrey G.; Vasil'eva, Valeria V.; Makarova, Valentina V. +1 more
We used an automatic image-processing method to detect solar-activity features observed in white light at the Kislovodsk Solar Station. This technique was applied to automatically or semi-automatically detect sunspots and active regions. The results of this automated recognition were verified with statistical data available from other observatorie…
Photometric Redshifts in the Hawaii-Hubble Deep Field-North (H-HDF-N)
Lehmer, B. D.; Alexander, D. M.; Bauer, F. E. +11 more
We derive photometric redshifts (z phot) for sources in the entire (~0.4 deg2) Hawaii-Hubble Deep Field-North (H-HDF-N) field with the EAzY code, based on point-spread-function-matched photometry of 15 broad bands from the ultraviolet (U band) to mid-infrared (IRAC 4.5 µm). Our catalog consists of a total of 131,678 sou…
Prospects for Measuring Supermassive Black Hole Masses with Future Extremely Large Telescopes
Barth, Aaron J.; Do, Tuan; Larkin, James E. +6 more
The next generation of giant-segmented mirror telescopes (>20 m) will enable us to observe galactic nuclei at much higher angular resolution and sensitivity than ever before. These capabilities will introduce a revolutionary shift in our understanding of the origin and evolution of supermassive black holes by enabling more precise black hole ma…
Cassini/VIMS Observes Rough Surfaces on Titan's Punga Mare in Specular Reflection
Sotin, Christophe; Barnes, Jason W.; Soderblom, Jason M. +7 more
PAH formation in O-rich planetary nebulae
Zijlstra, A. A.; Jones, D.; Lagadec, E. +2 more
Polycyclic aromatic hydrocarbons (PAHs) have been observed in O-rich planetary nebulae towards the Galactic bulge. This combination of oxygen-rich and carbon-rich material, known as dual-dust or mixed chemistry, is not expected to be seen around such objects. We recently proposed that PAHs could be formed from the photodissociation of CO in dense …
A mid-infrared view of the inner parsecs of the Seyfert galaxy Mrk 1066 using CanariCam/GTC
Esquej, P.; Aretxaga, I.; Díaz-Santos, T. +10 more
We present mid-infrared (MIR) imaging and spectroscopic data of the Seyfert 2 galaxy Mrk 1066 obtained with CanariCam (CC) on the 10.4-m Gran Telescopio CANARIAS (GTC). The galaxy was observed in imaging mode with an angular resolution of 0.24 arcsec (54 pc) in the Si-2 filter (8.7 µm). The image reveals a series of star-forming knots within…
Cluster Candidates around Low-power Radio Galaxies at z ~ 1-2 in COSMOS
Castignani, G.; De Zotti, G.; Chiaberge, M. +2 more
We search for high-redshift (z ~1-2) galaxy clusters using low power radio galaxies (FR I) as beacons and our newly developed Poisson probability method based on photometric redshift information and galaxy number counts. We use a sample of 32 FR Is within the Cosmic Evolution Survey (COSMOS) field from the Chiaberge et al. catalog. We derive a rel…