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Herschel Observations and Updated Spectral Energy Distributions of Five Sunlike Stars with Debris Disks
Green, Joel D.; Su, Kate Y. L.; Bryden, Geoff +2 more
Observations from the Herschel Space Observatory have more than doubled the number of wide debris disks orbiting Sunlike stars to include over 30 systems with R > 100 AU. Here, we present new Herschel PACS and reanalyzed Spitzer MIPS photometry of five Sunlike stars with wide debris disks, from Kuiper Belt size to R > 150 AU. The disk surrou…
The Interplanetary Network Response to LIGO GW150914
Zhang, X.; Cline, T.; Hurley, K. +15 more
We have performed a blind search for a gamma-ray transient of arbitrary duration and energy spectrum around the time of the LIGO gravitational-wave event GW150914 with the six-spacecraft interplanetary network (IPN). Four gamma-ray bursts were detected between 30 hr prior to the event and 6.1 hr after it, but none could convincingly be associated …
Suzaku Observation of the High-inclination Binary EXO 0748-676 in the Hard State
Makishima, Kazuo; Nakazawa, Kazuhiro; Xu, Haiguang +4 more
Utilizing archived Suzaku data acquired on 2007 December 25 for 46 ks, the X-ray spectroscopic properties of the dipping and eclipsing low-mass X-ray binary EXO 0748-676 were studied. At an assumed distance of 7.1 kpc, the data provided a persistent unabsorbed luminosity of 3.4× {10}36 erg cm-2 s-1 in 0.6-55 keV. T…
Protostars at Low Extinction in Orion A
Lada, Charles J.; Lewis, John Arban
In the list of young stellar objects (YSOs) compiled by Megeath et al. for the Orion A molecular cloud, only 44 out of 1208 sources found projected onto low extinction ({A}{{K}}\lt 0.8 mag) gas are identified as protostars. These objects are puzzling because protostars are not typically expected to be associated with extended low extinc…
On the Host Galaxy of GRB 150101B and the Associated Active Galactic Nucleus
Liu, Tong; Wang, Junfeng; Fang, Taotao +2 more
We present a multi-wavelength analysis of the host galaxy of short-duration gamma-ray burst (GRB) 150101B. Follow-up optical and X-ray observations suggested that the host galaxy, 2MASX J12320498-1056010, likely harbors low-luminosity active galactic nuclei (AGNs). Our modeling of the spectral energy distribution has confirmed the nature of the AG…
The Physical Environment around IRAS 17599-2148: Infrared Dark Cloud and Bipolar Nebula
Dewangan, L. K.; Ojha, D. K.; Zinchenko, I. +3 more
We present a multiscale and multiwavelength study to investigate the star formation process around IRAS 17599-2148, which is part of an elongated filamentary structure (EFS) (extension ∼21 pc) seen in the Herschel maps. Using the Herschel data analysis, at least six massive clumps (M clump ∼ 777-7024 M ⊙) are found in the EFS…
On the State of a Solar Active Region Before Flares and CMEs
Erdélyi, R.; Korsós, M. B.
Several attempts have been made to find reliable diagnostic tools to determine the state prior to flares and related coronal mass ejections (CMEs) in solar active regions (ARs). Characterization of the level of mixed states is carried out using the Debrecen sunspot Data for 116 flaring ARs. Conditional flare probabilities (CFPs) are calculated for…
The Role of Quenching Time in the Evolution of the Mass-size Relation of Passive Galaxies from the Wisp Survey
Zanella, A.; Scarlata, C.; Malkan, M. +13 more
We analyze how passive galaxies at z ∼ 1.5 populate the mass-size plane as a function of their stellar age, to understand if the observed size growth with time can be explained with the appearance of larger quenched galaxies at lower redshift. We use a sample of 32 passive galaxies extracted from the Wide Field Camera 3 Infrared Spectroscopic Para…
Protoplanetary Disk Shadowing by Gas Infalling onto the Young Star AK Sco
France, Kevin; Gómez de Castro, Ana I.; Loyd, Robert O. P. +2 more
Young solar-type stars grow through the accretion of material from the circumstellar disk during pre-main-sequence (PMS) evolution. The ultraviolet radiation generated in this process plays a key role in the chemistry and evolution of young planetary disks. In particular, the hydrogen Lyα line (Lyα) etches the disk surface by driving photoevaporat…
A VLA Survey for Faint Compact Radio Sources in the Orion Nebula Cluster
Williams, Jonathan P.; Sheehan, Patrick D.; Eisner, Josh A. +1 more
We present Karl G. Jansky Very Large Array 1.3, 3.6, and 6 cm continuum maps of compact radio sources in the Orion Nebular Cluster (ONC). We mosaicked 34 arcmin2 at 1.3 cm, 70 arcmin2 at 3.6 cm and 109 arcmin2 at 6 cm, containing 778 near-infrared detected young stellar objects and 190 Hubble Space Telescope-identi…