Search Publications
On the Progenitors of Local Group Novae. II. The Red Giant Nova Rate of M31
Shafter, A. W.; Bode, M. F.; Darnley, M. J. +1 more
In our preceding paper, Liverpool Telescope data of M31 novae in eruption were used to facilitate a search for their progenitor systems within archival Hubble Space Telescope data, with the aim of detecting systems with red giant secondaries (RG-novae) or luminous accretion disks. From an input catalog of 38 spectroscopically confirmed novae with …
Fe-K Line Time Variability and Ni Abundance of Distant Reflectors in Seyfert Galaxies
Fukazawa, Yasushi; Ohno, Masanori; Noda, Hirofumi +3 more
We have performed systematic studies of narrow Fe-K line (6.4 keV) flux variability and Ni-K line intensity for Seyfert galaxies, using Suzaku and XMM-Newton archival data. Significant Fe-K line variability of several tens of percent was detected for a pair of observations separated by 1000-2000 days (Cen A, IC 4329 A, NGC 3516, and NGC 4151) and …
The Globular Cluster System of the Coma cD Galaxy NGC 4874 from Hubble Space Telescope ACS and WFC3/IR Imaging
Chies-Santos, Ana L.; Peng, Eric W.; Blakeslee, John P. +4 more
We present new Hubble Space Telescope (HST) optical and near-infrared (NIR) photometry of the rich globular cluster (GC) system NGC 4874, the cD galaxy in the core of the Coma cluster (Abell 1656). NGC 4874 was observed with the HST Advanced Camera for Surveys in the F475W (g 475) and F814W (I 814) passbands and with the Wide…
The Intrinsic Abundance Ratio and X-factor of CO Isotopologues in L 1551 Shielded from FUV Photodissociation
Lai, Shih-Ping; Lin, Sheng-Jun; Nakamura, Fumitaka +10 more
We investigate the intrinsic abundance ratio of 13CO to C18O and the X-factor in L 1551 using the Nobeyama Radio Observatory (NRO) 45 m telescope. L 1551 is chosen because it is relatively isolated in the Taurus molecular cloud shielded from FUV photons, providing an ideal environment for studying the target properties. Our o…
Herschel Observed Stripe 82 Quasars and Their Host Galaxies: Connections between AGN Activity and host Galaxy Star Formation
Wu, Xue-Bing; Dong, X. Y.
In this work, we present a study of 207 quasars selected from the Sloan Digital Sky Survey quasar catalogs and the Herschel Stripe 82 survey. Quasars within this sample are high-luminosity quasars with a mean bolometric luminosity of 1046.4 erg s-1. The redshift range of this sample is within z < 4, with a mean value of 1.…
A Resolved Map of the Infrared Excess in a Lyman Break Galaxy at z = 3
Lehmer, B. D.; Bremer, M.; Kubo, M. +13 more
We have observed the dust continuum of 10 z = 3.1 Lyman break galaxies with the Atacama Large Millimeter/submillimeter Array at ∼450 mas resolution in Band 7. We detect and resolve the 870 µm emission in one of the targets with a flux density of S 870 = 192 ± 57 µJy, and measure a stacked 3σ signal of S 870 = 67 ±…
Ultraviolet Halos around Spiral Galaxies. I. Morphology
Bregman, Joel N.; Hodges-Kluck, Edmund; Cafmeyer, Julian
We examine ultraviolet halos around a sample of highly inclined galaxies within 25 Mpc to measure their morphology and luminosity. Despite contamination from galactic light scattered into the wings of the point-spread function, we find that ultraviolet (UV) halos occur around each galaxy in our sample. Around most galaxies the halos form a thick, …
Dust Attenuation of the Nebular Regions of z ~ 2 Star-forming Galaxies: Insight from UV, IR, and Emission Lines
De Barros, S.; Reddy, N.; Shivaei, I.
We use a sample of 149 spectroscopically confirmed UV-selected galaxies at z ∼ 2 to investigate the relative dust attenuation of the stellar continuum and the nebular emission lines. For each galaxy in the sample, at least one rest-frame optical emission line (Hα/[N II] λ6583 or [O III] λ5007) measurement has been taken from the litterature, and 4…
Comet 322P/SOHO 1: An Asteroid with the Smallest Perihelion Distance?
Snodgrass, Colin; Knight, Matthew M.; Kelley, Michael S. P. +1 more
We observed comet 322P/SOHO 1 (P/1999 R1) from the ground and with the Spitzer Space Telescope when it was between 2.2 and 1.2 au from the Sun. These are the first observations of any Solar and Heliospheric Observatory (SOHO)-discovered periodic comet by a non-solar observatory and allow us to investigate its behavior under typical cometary circum…
Dense Gas in Molecular Cores Associated with Planck Galactic Cold Clumps
Liu, Hong-Li; Liu, Tie; Yuan, Jinghua +7 more
We present the first survey of dense gas toward Planck Galactic Cold Clumps (PGCCs). Observations in the J = 1-0 transitions of HCO+ and HCN toward 621 molecular cores associated with PGCCs were performed using the Purple Mountain Observatory’s 13.7 m telescope. Among them, 250 sources were detected, including 230 cores detected in HCO<…