Quillen et al. presented an imaging survey with the Spitzer Space Telescope of 62 brightest cluster galaxies optical line emission located in cores X-ray-luminous clusters. They found that at least half these sources have signs excess IR emission. Here we discuss nature and its implications for cool core The strength mid-IR correlates luminosity lines. Excluding four systems dominated by AGN, remaining is likely related to star formation. mass molecular gas (estimated from CO observations)...

We report on an imaging survey with the Spitzer Space Telescope of 62 brightest cluster galaxies optical line emission.These are located in cores X-ray luminous clusters selected from ROSAT All-Sky Survey.We find that about half these sources have a sign excess infrared emission; 22 objects out detected at 70 µm, 18 8 to 5.8 µm flux ratios above 1.0 and 28 24 1.0.Altogether 35 our exhibit least one signs excess.Four excesses 4.5/3.6 ratio indicating presence hot dust, and/or unresolved...

Quillen et al. and O'Dea carried out a Spitzer study of sample 62 brightest cluster galaxies (BCGs) from the ROSAT sample, which were chosen based on their elevated Hα flux. We present Hubble Space Telescope Advanced Camera for Surveys far-ultraviolet (FUV) images Lyα continuum emission luminous emission-line nebulae in seven BCGs found to have an infrared (IR) excess. confirm that are actively forming stars suggests IR excess seen these is indeed associated with star formation. Our...

We present an analysis of Spitzer IRS spectroscopy 83 active galaxies from the extended 12 μm sample. find rank correlations between several tracers star formation which suggest that (1) polycyclic aromatic hydrocarbon feature is a reliable tracer formation, (2) there significant contribution to heating cool dust by stars, and (3) H2 emission also primarily excited formation. The 55–90 versus 20–30 spectral index plot diagnostic relative starburst galactic nuclei (AGNs). see large change in...

We present the results of high-resolution VLBI (very long baseline interferometry) observations at 1.6 and 4.9 GHz radio-loud Seyfert galaxy, Mrk 6. These are able to detect a compact radio core in this galaxy for first time. The has an inverted spectral index (|$\alpha ^{1.6}_{4.9}$| = +1.0 ± 0.2) brightness temperature 1 × 108 K. Three distinct components, which resemble jet elements and/or hotspots, also detected. position angles these elongated point not only curved 6, but towards...

(ABRIDGED) We present here the results from new Very Long Baseline Array observations at 1.6 and 5 GHz of 19 galaxies a complete sample 21 UGC FRI radio galaxies. New Chandra data two sources, viz., UGC00408 UGC08433, are combined with archival 13 sources. The ten "core-jet" sources polarization-sensitive, while constitute second epoch total intensity nine "core-only" Polarized emission is detected in jets seven GHz, but cores essentially unpolarized, except M87. Polarization jet edges...

We present 19 nearby (z < 0.3) 3CR radio galaxies imaged at low and high excitation as part of a Cycle 15 Hubble Space Telescope (HST) snapshot survey with the Advanced Camera for Surveys (ACS). These images consist exposures Hα (6563 Å, plus [N ii] contamination) [O iii]λ5007 emission lines using narrowband linear ramp filters adjusted according to redshift target. To facilitate continuum subtraction, single-pointing 60 s line-free exposure was taken mediumband filter appropriate target's...

We present the results of analysis a set medium resolution spectra, obtained by Space Telescope Imaging Spectrograph on board Hubble Telescope, emission line gas in nuclei complete sample 21 nearby, early-type galaxies with radio jets (the UGC FR-I Sample). For each galaxy nucleus we spectroscopic data region H-alpha and dervived kinematics. find that 67% appears to be rotating and, one exception, cases where rotation is not seen are either face or have complex central morphologies. 62% fit...

We present new Spitzer IRS spectroscopy of Cygnus A, one the most luminous radio sources in local universe. Data on inner 20" are combined with reductions MIPS and IRAC photometry as well data from literature to form a through mid-infrared spectral energy distribution (SED). This SED is then modeled combination torus reprocessed active galactic nucleus (AGN) radiation, dust enshrouded starburst, synchrotron jet. physically motivated components successfully reproduces observed emission over...

(abridged) We investigate the kinematics of central gas disk radio-loud elliptical galaxy NGC 4335, derived from HST/STIS long-slit spectroscopic observations Halpha+[NII] along 3 parallel slit positions. The observed mean velocities are consistent with a rotating thin disk. model in customary way. This sets sigma upper limit 10^8 Msun on black hole mass, Mbh. velocity dispersion at r &lt;0.5'' is excess that predicted by model. does not invalidate model, if caused localized turbulent motion...

(abridged) We analyze and model HST /STIS observations of a sample 27 galaxies; 16 Fanaroff &amp; Riley Type I radio galaxies 11 (more) normal early-type galaxies. focus here on what can be learned from the nuclear velocity dispersion (line width) gas as complement to many studies dealing with rotation velocities. find that in STIS aperture ~0.1''-0.2'' generally exceeds large-scale stellar galaxy. This is qualitatively consistent presence central BHs, but raises question whether excess...

We describe our characterization of the kinematics emission-line gas in nuclear regions a complete sample 21 nearby radio galaxies. obtained data using Space Telescope Imaging Spectrograph on board Hubble Telescope. show that point-to-point variations are largest perpendicular to disks and nuclei where organized motion is less pronounced, suggesting motions present from has not settled into smooth rotation. velocity dispersion distributed as function inclination, so likely arises isotropic...

Among radio galaxies containing nuclear dust disks, the bipolar jet axis is generally observed to be perpendicular disk major axis. The FR I source 3C 449 an outlier this statistical majority, as it possesses a nearly parallel jet/disk orientation on sky. We examine 600 pc dusty in galaxy with images from Hubble Space Telescope. find that colormap of exhibits twist its isocolor contours (isochromes). model by integrating galactic starlight through absorptive disk, and anomalous isochromes...

Abstract We present Chandra and XMM-Newton X-ray, Very Large Array (VLA) radio, optical observations of three candidate compact steep spectrum (CSS) radio galaxies. CSS sources are a galactic scale presumably driving shock through the interstellar medium (ISM) their host galaxy. B3 1445+410 is low-excitation emission line galaxy with possibly hybrid Fanaroff–Riley FRI/II (or fat double) morphology. The reveal point-like source that well fit power law consistent from Doppler boosted core. 3C...

Immersive informal environments (such as summer camps, residential programs at museums and science centers, etc.) can provide a venue for young people to explore their scientific thinking in less formalized context than is available most traditional classrooms. While class instruction beneficial children develop formal skills content knowledge, venues that offer more opportunities experimentation exploration promote deeper understandings. In this article I the background of learning where...

We present the initial results of our analysis line emission produced in gas disks found at centers a sample nearby radio galaxies with jets. obtained data using STIS (The Space Telescope Imaging Spectrograph) three parallel slit positions on nucleus each galaxy. This allows us to map Hα + [NII] flux, radial velocity and dispersion. that we cannot rule out rotating disk model for any case. 62% fit is improved by inclusion an additional broad component. By comparing observed central...

The dynamics of gravitating astrophysical systems such as black holes and neutron stars are fascinatingly complex, offer some nature's most spectacular phenomena, capture the public's imagination in ways that few subjects can. Here, we describe {\it AstroDance}, a multi-media project to engage deaf hard-of-hearing (DHH) students astronomy gravitational physics. AstroDance} incorporates multiple means representation scientific concepts was performed primarily for secondary post-secondary...

The dynamics of gravitating astrophysical systems such as black holes and neutron stars are fascinatingly complex, offer some nature's most spectacular phenomena, capture the public's imagination in ways that few subjects can. Here, we describe AstroDance, a multi-media project to engage deaf hard-of-hearing (DHH) students astronomy gravitational physics. AstroDance incorporates multiple means representation scientific concepts was performed primarily for secondary post-secondary audiences...

We have observed a complete sample of 21 nearby ( D &lt; 70 h −1 Mpc) Fanaroff &amp; Riley Type I galaxies with HST/WFPC2 and detected dust disks lanes in 19 them. The radio jets are roughly perpendicular to the which is used constrain Doppler boosting factors jet cores. VLBA core flux correlates central Hα+[NII] might indicate that dominated by an isotropic component. Twelve show nuclear optical sources. discuss various possible origins for this emission.

We present initial results of our analysis line emission produced in gas disks found at the centers a sample nearby, radio galaxies with jets. obtained data using STIS (The Space Telescope Imaging Spectrograph) three parallel slit positions on nucleus each galaxy. This allows us to map H$\alpha$ + [NII] flux, radial velocity and dispersion. find evidence rotating 11 we can not currently rule out disk model for remaining eight. For systems, that minimum central enclosed mass is greater than...