Search Publications
The Stability of Low Surface Brightness Disks Based on Multi-wavelength Modeling
Gallagher, J. S.; Wood, K.; Matthews, L. D. +1 more
To investigate the structure and composition of the dusty interstellar medium (ISM) of low surface brightness (LSB) disk galaxies, we have used multi-wavelength photometry to construct spectral energy distributions for three low-mass, edge-on LSB galaxies (V rot = 88-105 km s-1). We use Monte Carlo radiation transfer codes th…
Dust and Chemical Abundances of the Sagittarius Dwarf Galaxy Planetary Nebula Hen2-436
Izumiura, Hideyuki; Meixner, Margaret; Otsuka, Masaaki +3 more
We have estimated elemental abundances of the planetary nebula (PN) Hen2-436 in the Sagittarius (Sgr) spheroidal dwarf galaxy using ESO/VLT FORS2, Magellan/MMIRS, and Spitzer/IRS spectra. We have detected candidates of fluorine [F II] λ4790, krypton [Kr III] λ6826, and phosphorus [P II] λ7875 lines and successfully estimated the abundances of thes…
Obscured Starburst Activity in High-redshift Clusters and Groups
Kocevski, Dale D.; McGrath, Elizabeth J.; Fassnacht, Christopher D. +6 more
Using Spitzer-Multiband Imaging Photometer 24 µm imaging and extensive Keck spectroscopy, we examine the nature of the obscured star-forming population in three clusters and three groups at z ~ 0.9. These six systems are the primary components of the Cl1604 supercluster, the largest structure imaged by Spitzer at redshifts approaching unity.…
The Black Hole Mass in the Brightest Cluster Galaxy NGC 6086
Ma, Chung-Pei; Graham, James R.; Gebhardt, Karl +4 more
We present the first direct measurement of the central black hole mass, M •, in NGC 6086, the Brightest Cluster Galaxy (BCG) in A2162. Our investigation demonstrates for the first time that stellar-dynamical measurements of M • in BCGs are possible beyond the nearest few galaxy clusters. We observed NGC 6086 with laser guide …
Molecular CO(1-0) Gas in the z ~ 2 Radio Galaxy MRC 0152-209
Villar-Martín, M.; Morganti, R.; Ekers, R. D. +12 more
We report the detection of molecular CO(1-0) gas in the high-z radio galaxy MRC 0152-209 (z = 1.92) with the Australia Telescope Compact Array Broadband Backend (ATCA/CABB). This is the third known detection of CO(1-0) in a high-z radio galaxy to date. CO(1-0) is the most robust tracer of the overall molecular gas content (including the widespread…
Properties of the Compact H II Region Complex G-0.02-0.07
Morris, M. R.; Wang, Q. D.; Dong, H. +4 more
We present new extinction maps and high-resolution Paschen-alpha images of G-0.02-0.07, a complex of compact H II regions located adjacent to the M-0.02-0.07 giant molecular cloud, 6 pc in projection from the center of the Galaxy. These H II regions, which lie in projection just outside the boundary of the Sgr A East supernova remnant, represent o…
Early-type Galaxies at z ~ 1.3. II. Masses and Ages of Early-type Galaxies in Different Environments and Their Dependence on Stellar Population Model Assumptions
Demarco, R.; Tanaka, M.; Rosati, P. +14 more
We have derived masses and ages for 79 early-type galaxies (ETGs) in different environments at z ~ 1.3 in the Lynx supercluster and in the GOODS/CDF-S field using multi-wavelength (0.6-4.5 µm KPNO, Palomar, Keck, Hubble Space Telescope, Spitzer) data sets. At this redshift the contribution of the thermally pulsing asymptotic giant branch (TP…
Hubble Space Telescope Morphologies of z ~ 2 Dust-obscured Galaxies. II. Bump Sources
Le Floc'h, E.; Armus, L.; Dey, Arjun +11 more
We present Hubble Space Telescope imaging of 22 ultra-luminous infrared galaxies (ULIRGs) at z ≈ 2 with extremely red R - [24] colors (called dust-obscured galaxies, or DOGs) which have a local maximum in their spectral energy distribution (SED) at rest-frame 1.6 µm associated with stellar emission. These sources, which we call "bump DOGs," …
Reconstructing the Triaxiality of the Galaxy Cluster A1689: Solving the X-ray and Strong Lensing Mass Discrepancy
Limousin, Marceau; Morandi, Andrea; Pedersen, Kristian
We present the first determination of the intrinsic triaxial shapes and three-dimensional physical parameters of both dark matter (DM) and the intracluster medium for the galaxy cluster A1689. We exploit the novel method we recently introduced in order to infer the three-dimensional physical properties in triaxial galaxy clusters by combining join…
An Expanded Very Large Array and CARMA Study of Dusty Disks and Torii with Large Grains in Dying Stars
Sahai, R.; Sánchez Contreras, C.; Morris, M. R. +2 more
We report the results of a pilot multiwavelength survey in the radio continuum (X, Ka, and Q bands, i.e., from 3.6 cm to 7 mm) carried out with the Expanded Very Large Array (EVLA) in order to confirm the presence of very large dust grains in dusty disks and torii around the central stars in a small sample of post-asymptotic giant branch (pAGB) ob…