Aeree Chung

We present the results of a new VLA H i Imaging survey of Virgo galaxies, the VLA Imaging survey of Virgo galaxies in Atomic gas (VIVA). The survey includes high-resolution H i data of 53 carefully selected late type galaxies (48 spirals and five irregular systems). The goal is to study environmental effects on H i gas properties of cluster galaxies to understand which physical mechanisms affect galaxy evolution in different density regions, and to establish how far out the impact of the cluster

In a new HI imaging survey of Virgo galaxies (VIVA: VLA Imaging of Virgo galaxies in Atomic gas), we find 7 spiral galaxies with long HI tails. The morphology varies but all the tails are extended well beyond the optical radii on one side. These galaxies are found in intermediate-low density regions (0.6-1 Mpc in projection from M87). The tails are all pointing roughly away from M87, suggesting that these tails may have been created by a global cluster mechanism. While the tidal effects of the c

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The feedback from galactic outflows is thought to play an important role in shaping the gas content, star formation history, and ultimately the stellar mass function of galaxies. Here we present evidence for massive molecular outflows associated with ultra-luminous infrared galaxies (ULIRGs) in the co-added Redshift Search Receiver 12CO (1-0) spectrum. Our stacked spectrum of 27 ULIRGs at z = 0.043-0.11 (νrest = 110-120 GHz) shows broad wings around the CO line with ΔV(FWZI) 2000 km s–1. Its int

We present 12CO J=1-->0 observations of ultraluminous infrared galaxies (ULIRGs) obtained using the Redshift Search Receiver (RSR) on the 14-m telescope of the Five College Radio Astronomy Observatory. The RSR is a novel, dual-beam, dual-polarization receiver equipped with an ultra-wideband spectrometer backend that is being built as a facility receiver for the Large Millimeter Telescope. Our sample consists of 29 ULIRGs in the redshift range of 0.04-0.11, including 10 objects with no prior 1

We have identified two new galaxies with gas counter-rotation (NGC 1596 and 3203) and have confirmed similar behaviour in another one (NGC 128), this using results from separate studies of the ionized-gas and stellar kinematics of a well-defined sample of 30 edge-on disc galaxies. Gas counter-rotators thus represent 10 ± 5 per cent of our sample, but the fraction climbs to 21 ± 11 per cent when only lenticular (S0) galaxies are considered and to 27 ± 13 per cent for S0 galaxies with detected ion

The 3 mm wavelength spectra of 10 galaxies have been obtained at the Five College Radio Astronomy Observatory using a new, very broadband receiver and spectrometer, called the Redshift Search Receiver (RSR). The RSR has an instantaneous bandwidth of 37 GHz covering frequencies from 74 to 111 GHz, and has a spectral resolution of 31 MHz (~100 km/s). During tests of the RSR on the FCRAO 14 m telescope the complete 3 mm spectra of the central regions of NGC 253, Maffei 2, NGC1068, IC 342, M82, NGC

ABSTRACT We have performed a very long baseline interferometry (VLBI) survey of local (z < 0.05) ultrahard X-ray (14–195 keV) selected active galactic nuclei (AGNs) from the Swift Burst Alert Telescope (BAT) using KVN, KaVA, and VLBA. We first executed fringe surveys of 142 BAT-detected AGNs at 15 or 22 GHz. Based on the result from the fringe surveys and archival data, we find 10/279 nearby AGN (∼4 per cent) VLBI have 22 GHz flux above 30 mJy. This implies that the X-ray AGNs with a brig

The transport of heavy particles produced by the 10B(n,α)Li and 235U(n,νn)ff nuclear reactions in a two-region cylindrical geometry is analyzed. Total spatially dependent energy current, power density, and transport efficiency are calculated. These results are significantly different from what would be predicted using a two-region slab model—the model generally used for kinetic analysis of nuclear-pumped plasmas. The calculated transport efficiency for a 0.4 mg/cm2 10B coating was 9% and 16% for

We present 12 CO (J = 1 0) observations of a sample of local galaxies (0.04 < z < 0.08) with a large neutral hydrogen reservoir, or 'H I monsters'. The data were obtained using the redshift search receiver on the five college radio astronomy observatory (FCRAO) 14 m telescope. The sample consists of 20 H I-massive galaxies with M H I > 3 10 10 M from the Arecibo Legacy Fast ALFA (ALFALFA) survey and 8 low surface brightness galaxies (LSBs) with a comparable M H I (>1.5 10 10 M ). Our sample sele

We probe the H i properties and the gas environments of three early-type barred galaxies harbouring counter-rotating ionized gas: NGC 128, NGC 3203 and NGC 7332. Each system has one or more optically identified galaxy at a similar or as yet unknown redshift within a 50-kpc projected radius. Using H i synthesis imaging data, we investigate the hypothesis that the counter-rotating gas in these galaxies has been accreted from their neighbours. In NGC 128 and NGC 3203, we find 9.6 × 107 and 2.3 × 10

We present Australia Telescope Compact Array (ATCA) HI imaging of the edge-on galaxy NGC 1596, which was recently found to have counter-rotating ionized gas in its center (&lt;15"). We find a large HI envelope associated with a nearby companion, the dwarf irregular galaxy NGC 1602. The HI covers a region \~11.9'x13.4' (62x70 kpc^2) and the total HI mass detected is 2.5+/-0.1x10^9 Msun (assuming an 18 Mpc distance). The HI is centered on NGC 1602 but appears to have two tidal tails, one of which

We present Australia Telescope Compact Array H i imaging of the edge-on galaxy NGC 1596, which was recently found to have counterrotating ionized gas in its centre (<15 arcsec). We find a large H i envelope associated with a nearby companion, the dwarf irregular galaxy NGC 1602. The H i covers a region ≈11.9 × 13.4 arcmin2 (62 × 70 kpc2) and the total H i mass detected is 2.5 ± 0.1 × 109 M⊙ (assuming an 18-Mpc distance). The H i is centred on NGC 1602 but appears to have two tidal tails, one of

ABSTRACT We present high spatial resolution (≈24 pc) Atacama Large Millimeter/sub-millimeter Array 12CO(2-1) observations of the central region of the nearby barred spiral galaxy NGC 5806. NGC 5806 has a highly structured molecular gas distribution with a clear nucleus, a nuclear ring, and offset dust lanes. We identify 170 spatially and spectrally resolved giant molecular clouds (GMCs). These clouds have comparable sizes (Rc) and larger gas masses, observed linewidths (σobs, los), and gas mass

Abstract This study investigated the properties of the molecular gas content and star formation activity of 17 Virgo spirals, 21 Ursa Major (UMa) spirals, 13 Pisces spiral galaxies, and a comparison sample of 11 field spiral galaxies with a spatially resolved gas and stellar distribution. The H i -deficient galaxies with a def H i &gt; 0.4 have a similar range of CO luminosity normalized by the K -band luminosity ( L CO / L K ) like the field spirals, although their CO content can be smaller by