Search Publications
Herschel observations of extended atomic gas in the core of the Perseus cluster
Baum, Stefi A.; O'Dea, Christopher P.; Donahue, Megan +11 more
We present Herschel observations of the core of the Perseus cluster of galaxies. Especially intriguing is the network of filaments that surround the brightest cluster galaxy, NGC 1275, previously imaged extensively in Hα and CO. In this work, we report detections of far-infrared (FIR) lines, in particular, [C II] 158, [O I] 63, [N II] 122, [O IB] …
The dark GRB 080207 in an extremely red host and the implications for gamma-ray bursts in highly obscured environments
Cenko, S. B.; Bloom, J. S.; Watson, D. +9 more
We present comprehensive X-ray, optical, near- and mid-infrared and submm observations of GRB 080207 and its host galaxy. The afterglow was undetected in the optical and near-infrared (nIR) implying an X-ray-to-optical spectral slope less than 0.3, identifying GRB 080207 as a dark burst. Swift X-ray observations show extreme absorption in the host…
A unique isolated dwarf spheroidal galaxy at D = 1.9 Mpc
Makarova, Lidia; Guhathakurta, Puragra; Makarov, Dmitry +5 more
We present a photometric and spectroscopic study of the unique isolated nearby dwarf spheroidal (dSph) galaxy KKR 25. The galaxy was resolved into stars with Hubble Space Telescope/Wide Field Planetary Camera 2 including old red giant branch and red clump. We have constructed a model of the resolved stellar populations and measured the star format…
Insights on the X-ray weak quasar phenomenon from XMM-Newton monitoring of PHL 1092
Brandt, W. N.; Fabian, A. C.; Boller, Th. +3 more
PHL 1092 is a z ∼ 0.4 high-luminosity counterpart of the class of Narrow-Line Seyfert 1 galaxies. In 2008, PHL 1092 was found to be in a remarkably low X-ray flux state during an XMM-Newton observation. Its 2 keV flux density had dropped by a factor of ∼260 with respect to a previous observation performed 4.5 yr earlier. The ultraviolet (UV) flux …
Optical counterpart of HLX-1 during the 2010 outburst
Soria, Roberto; Kong, Albert K. H.; Gladstone, Jeanette C. +2 more
We studied the optical counterpart of the intermediate-mass black hole candidate HLX-1 in ESO 243-49. We used a set of Very Large Telescope imaging observations from 2010 November, integrated by Swift X-ray data from the same epoch. We measured standard Vega brightnesses U= 23.89 ± 0.18 mag, B= 25.19 ± 0.30 mag, V= 24.79 ± 0.34 mag and R= 24.71 ± …
The tidal tails of 47 Tucanae
Lane, Richard R.; Küpper, Andreas H. W.; Heggie, Douglas C.
The Galactic globular cluster 47 Tucanae (47 Tuc) shows a rare increase in its velocity dispersion profile at large radii, indicative of energetic, yet bound, stars at large radii dominating the velocity dispersion and, potentially, of ongoing evaporation. Escaping stars will form tidal tails, as seen with several Galactic globular clusters; howev…
An indirect measurement of gas evolution in galaxies at 0.5 < z < 2.0
Popping, G.; Caputi, K. I.; Trager, S. C. +1 more
One key piece of information missing from high-redshift galaxy surveys is the galaxies' cold gas contents. We present a new method to indirectly determine cold gas surface densities and integrated gas masses from galaxy star formation rates and to separate the atomic and molecular gas components. Our predicted molecular and total gas surface densi…
A universal stellar mass-size relation of galaxies in the GOODS-North region
Kajisawa, Masaru; Ichikawa, Takashi; Akhlaghi, Mohammad
We present scaling relations between the stellar mass (M*) and size of galaxies at 0.3 < z < 3 for half-light (R50) and 90 per cent-light (R90) radii, using a deep K-band-selected catalogue taken with the Subaru Telescope and Multi-Object Infrared Camera and Spectrograph (MOIRCS) in the Great Observatories Or…
The magnetized medium around the radio galaxy B2 0755+37: an interaction with the intragroup gas
Guidetti, D.; Croston, J. H.; Parma, P. +2 more
We explore the magnetoionic environment of the isolated radio galaxy B2 0755+37 using detailed imaging of the distributions of Faraday rotation and depolarization over the radio source from Very Large Array observations at 1385, 1465 and 4860 MHz and new X-ray data from XMM-Newton. The rotation measure (RM) distribution is complex, with evidence f…
The radio-X-ray relation as a star formation indicator: results from the Very Large Array-Extended Chandra Deep Field-South
Brandt, W. N.; Tozzi, P.; Xue, Y. Q. +10 more
In order to trace the instantaneous star formation rate (SFR) at high redshift, and thus help in understanding the relation between the different emission mechanisms related to star formation, we combine the recent 4-Ms Chandra X-ray data and the deep Very Large Array radio data in the Extended Chandra Deep Field-South region. We find 268 sources …