Search Publications
Comoving Space Density and Obscured Fraction of High-redshift Active Galactic Nuclei in the Subaru/XMM-Newton Deep Survey
Ueda, Yoshihiro; Akiyama, Masayuki; Hiroi, Kazuo +1 more
We study the comoving space density of X-ray-selected luminous active galactic nuclei (AGNs) and the obscured AGN fraction at high redshifts (3 < z < 5) in the Subaru/XMM-Newton Deep Survey field. From an X-ray source catalog with high completeness of optical identification thanks to deep optical images, we select a sample of 30 AGNs at z &g…
A Physical Model for SN 2001ay, a Normal, Bright, Extremely Slow Declining Type Ia Supernova
Wang, L.; Baron, E.; Dominguez, I. +5 more
We present a study of the peculiar Type Ia supernova 2001ay (SN 2001ay). The defining features of its peculiarity are high velocity, broad lines, and a fast rising light curve, combined with the slowest known rate of decline. It is one magnitude dimmer than would be predicted from its observed Δm 15, and shows broad spectral features. W…
Large-scale Star-formation-driven Outflows at 1 < z < 2 in the 3D-HST Survey
Franx, Marijn; Labbé, Ivo; van Dokkum, Pieter +18 more
We present evidence of large-scale outflows from three low-mass (log(M */M ⊙) ~ 9.75) star-forming (SFR > 4 M ⊙ yr-1) galaxies observed at z = 1.24, z = 1.35, and z = 1.75 in the 3D-HST Survey. Each of these galaxies is located within a projected physical distance of 60 kpc around the sight line to th…
Is IGR J11014-6103 a Pulsar with the Highest Known Kick Velocity?
Rahoui, Farid; Bodaghee, Arash; Tomsick, John A. +4 more
We report on Chandra X-ray and Parkes radio observations of IGR J11014-6103, which is a possible pulsar wind nebula with a complex X-ray morphology and a likely radio counterpart. With the superb angular resolution of Chandra, we find evidence that a portion of the extended emission may be related to a bow shock due to the putative pulsar moving t…
Revealing the Millimeter Environment of the New FU Orionis Candidate HBC722 with the Submillimeter Array
Bourke, Tyler L.; Dunham, Michael M.; Chen, Xuepeng +3 more
We present 230 GHz Submillimeter Array continuum and molecular line observations of the newly discovered FU Orionis candidate HBC722. We report the detection of seven 1.3 mm continuum sources in the vicinity of HBC722, none of which corresponds to HBC722 itself. We compile infrared and submillimeter continuum photometry of each source from previou…
Disentangling AGN and Star Formation in Soft X-Rays
Ptak, A.; Heckman, T. M.; LaMassa, Stephanie M.
We have explored the interplay of star formation and active galactic nucleus (AGN) activity in soft X-rays (0.5-2 keV) in two samples of Seyfert 2 galaxies (Sy2s). Using a combination of low-resolution CCD spectra from Chandra and XMM-Newton, we modeled the soft emission of 34 Sy2s using power-law and thermal models. For the 11 sources with high s…
Discrete Mass Ejections from the Be/X-Ray Binary A0535+26/HD 245770
Li, Hui; Yan, Jingzhi; Liu, Qingzhong
We present long-term optical spectroscopic observations on the Be/X-ray binary A0535+26 from 1992 to 2010. Combined with the public V-band photometric data, we find that each giant X-ray outburst occurred in a fading phase of the optical brightness. The anti-correlation between the optical brightness and the Hα intensity during our 2009 observatio…
SphinX Measurements of the 2009 Solar Minimum X-Ray Emission
Kuzin, S.; Phillips, K. J. H.; Reale, F. +9 more
The SphinX X-ray spectrophotometer on the CORONAS-PHOTON spacecraft measured soft X-ray emission in the 1-15 keV energy range during the deep solar minimum of 2009 with a sensitivity much greater than GOES. Several intervals are identified when the X-ray flux was exceptionally low, and the flux and solar X-ray luminosity are estimated. Spectral fi…
Impact of Systematics on SZ-Optical Scaling Relations
Miller, C. J.; Shaw, L.; Nord, B. +2 more
One of the central goals of multi-wavelength galaxy cluster cosmology is to unite all cluster observables to form a consistent understanding of cluster mass. Here, we study the impact of systematic effects from optical cluster catalogs on stacked Sunyaev-Zel'dovich (SZ) signals. We show that the optically predicted Y-decrement can vary by as much …
First Detection of Hydrogen Chloride Toward Protostellar Shocks
Codella, C.; Ceccarelli, C.; Caux, E. +8 more
We present the first detection of hydrogen chloride in a protostellar shock by observing the fundamental transition at 626 GHz with the HIFI spectrometer. We detected two of the three hyperfine lines from which we derived a line opacity <=1. Using a non-local thermodynamic equilibrium large velocity gradient code, we constrained the HCl column …