Search Publications
CLASH: New Multiple Images Constraining the Inner Mass Profile of MACS J1206.2-0847
Infante, L.; Zheng, W.; Molino, A. +45 more
We present a strong-lensing analysis of the galaxy cluster MACS J1206.2-0847 (z = 0.44) using UV, Optical, and IR, HST/ACS/WFC3 data taken as part of the CLASH multi-cycle treasury program, with VLT/VIMOS spectroscopy for some of the multiply lensed arcs. The CLASH observations, combined with our mass model, allow us to identify 47 new multiply le…
The Nature of Extremely Red H - [4.5] > 4 Galaxies Revealed with SEDS and CANDELS
Dickinson, M.; Ferguson, H. C.; Giavalisco, M. +20 more
We have analyzed a sample of 25 extremely red H - [4.5] > 4 galaxies, selected using 4.5 µm data from the Spitzer SEDS survey and deep H-band data from the Hubble Space Telescope CANDELS survey, over ~180 arcmin2 of the UKIDSS Ultra-Deep Survey field. Our aim is to investigate the nature of this rare population of mid-infrared …
The Low-redshift Intergalactic Medium as Seen in Archival Legacy HST/STIS and FUSE Data
Shull, J. Michael; Danforth, Charles W.; Tilton, Evan M. +1 more
We present a comprehensive catalog of ultraviolet (HST/STIS and FUSE) absorbers in the low-redshift intergalactic medium (IGM) at z < 0.4. The catalog draws from much of the extensive literature on IGM absorption and reconciles discrepancies among several previous catalogs through a critical evaluation of all reported absorption features in lig…
Velocity Measurements for a Solar Active Region Fan Loop from Hinode/EIS Observations
Young, P. R.; Mason, H. E.; O'Dwyer, B.
The velocity pattern of a fan loop structure within a solar active region over the temperature range 0.15-1.5 MK is derived using data from the EUV Imaging Spectrometer (EIS) on board the Hinode satellite. The loop is aligned toward the observer's line of sight and shows downflows (redshifts) of around 15 km s-1 up to a temperature of 0…
The Nature and Nurture of Bars and Disks
Corsini, E. M.; Aguerri, J. A. L.; Sánchez-Janssen, R. +2 more
The effects that interactions produce on galaxy disks and how they modify the subsequent formation of bars need to be distinguished to fully understand the relationship between bars and environment. To this aim we derive the bar fraction in three different environments ranging from the field to Virgo and Coma Clusters, covering an unprecedentedly …
Long-term Measurements of Sunspot Magnetic Tilt Angles
Li, Jing; Ulrich, Roger K.
Tilt angles of close to 30,600 sunspots are determined using Mount Wilson daily averaged magnetograms taken from 1974 to 2012, and SOHO/MDI magnetograms taken from 1996 to 2010. Within a cycle, more than 90% of sunspots have a normal polarity alignment along the east-west direction following Hale's law. The median tilts increase with increasing la…
The CHESS Survey of the L1157-B1 Shock Region: CO Spectral Signatures of Jet-driven Bow Shocks
Codella, C.; Ceccarelli, C.; Benedettini, M. +7 more
The unprecedented sensitivity of Herschel coupled with the high resolution of the HIFI spectrometer permits studies of the intensity-velocity relationship I(v) in molecular outflows, over a higher excitation range than possible up to now. Over the course of the CHESS Key Program, we have observed toward the bright bow shock region L1157-B1, the CO…
On Dark Peaks and Missing Mass: A Weak-lensing Mass Reconstruction of the Merging Cluster System A520
Bradač, Maruša; Massey, Richard; Gonzalez, Anthony H. +4 more
Merging clusters of galaxies are unique in their power to directly probe and place limits on the self-interaction cross-section of dark matter. Detailed observations of several merging clusters have shown the intracluster gas to be displaced from the centroids of dark matter and galaxy density by ram pressure, while the latter components are spati…
Characterizing Transition Temperature Gas in the Galactic Corona
Savage, Blair D.; Fox, Andrew J.; Wakker, Bart P. +2 more
We present a study of the properties of the transition temperature (T ~ 105 K) gas in the Milky Way corona, based on the measurements of O VI, N V, C IV, Si IV, and Fe III absorption lines seen in the far-ultraviolet spectra of 58 sight lines to extragalactic targets, obtained with the Far-Ultraviolet Spectroscopic Explorer and the Spac…
Herschel-PACS Observations of Far-IR CO Line Emission in NGC 1068: Highly Excited Molecular Gas in the Circumnuclear Disk
Lutz, D.; Genzel, R.; Poglitsch, A. +13 more
We report the detection of far-IR CO rotational emission from the prototypical Seyfert 2 galaxy NGC 1068. Using Herschel-PACS, we have detected 11 transitions in the J upper = 14-30 (E upper/kB = 580-2565 K) range, all of which are consistent with arising from within the central 10'' (700 pc). The detected transiti…