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RIT study suggests dying stars give newborn black holes a swift kick
RIT study dying stars newborn black holes swift kick
2017/7/21
New information gleaned from gravitational wave observations is helping scientists understand what happens when massive stars die and transform into black holes.
Rochester Institute of Technology res...
A remarkable long-term light curve, and deep, low-state spectroscopy: Swift & XMM-Newton monitoring of the NLS1 galaxy Mkn 335
remarkable long-term light curve low-state spectroscopy Swift XMM-Newton monitoring the NLS1 galaxy
2012/2/23
The Narrow-line Seyfert 1 galaxy (NLS1) Mkn 335 is remarkable because it has repeatedly shown deep, long X-ray low-states which show pronounced spectral structure. It has become one of the prototype A...
Swift J2058.4+0516: Discovery of a Possible Second Relativistic Tidal Disruption Flare
Swift Possible Second Relativistic idal Disruption Flare
2011/10/17
We report the discovery by the Swift hard X-ray monitor of the transient source Swift J2058.4+0516 (Sw J2058+05). Our multi-wavelength follow-up campaign uncovered a long-lived (duration >~ months), l...
Swift monitoring of the central X-ray source in RCW 103
pulsars: general – stars: neutron – X-rays: individual: 1E 161348–5055
2011/10/11
The X-ray source 1E 161348-5055 lies at the centre of the 2-kyr-old supernova remnant RCW 103. Owing to its 24-ks modulation, orders-of-magnitude flux variability over a few months/years, and lack of ...
A Search for Lyman Break Galaxies in the CDF-S Using Swift UVOT
Search Lyman Break Galaxies CDF-S Using Swift
2011/10/12
While the Swift satellite is primarily designed to study gamma-ray bursts, its ultraviolet and optical imaging and spectroscopy capabilities are also being used for a variety of scientific programs. I...
VERITAS Observations of the Unusual Extragalactic Transient Swift J164449.3+573451
VERITAS Observations Unusual Extragalactic Transient Swift
2011/9/30
We report on very-high-energy ($>$100 GeV) gamma-ray observations of Swift J164449.3+573451, an unusual transient object first detected by the {\it Swift} Observatory and later detected by multiple ra...
Host Galaxy Properties of the Swift BAT Ultra Hard X-ray Selected AGN
Galaxy Properties Swift Hard X-ray Selected AGN
2011/9/29
We have assembled the largest sample of ultra hard X-ray selected (14-195 keV) AGN with host galaxy optical data to date, with 185 nearby (z<0.05), moderate luminosity AGN from the Swift BAT sample. T...
Swift时代伽马射线暴的观测和理论
伽马射线暴 辐射机制 伽马射线
2012/9/12
伽马射线暴是宇宙中最剧烈的爆发现象之一。Swift卫星的快速定位和Fermi卫星的宽、高能段观测,使得伽马暴的观测可以全波段进行。通过Swift的观测可以对伽马暴现象的本质有进一步的理解,而Fermi卫星提供了一些暴高能光子的辐射数据,为进一步研究暴的辐射机制和伽马暴以及它的余辉提供了有力的依据。介绍了Swift和Fermi卫星发射后一些伽马暴的观测和理论研究进展。
A Statistical Comparison of the Optical/UV and X-ray Afterglows of Gamma-Ray Bursts using the Swift Ultra-violet Optical and X-ray Telescopes
Statistical Comparison the Optical/UV X-ray
2011/1/13
We present the systematic analysis of the UVOT and XRT light curves for a sample of 26 Swift Gamma-Ray Bursts (GRBs). By comparing the optical/UV and X-ray light curves, we found that they are remarka...
Swift observation of Segue 1: constraints on sterile neutrino parameters in the darkest galaxy
Swift observation constraints on sterile neutrino parameters
2011/1/10
Some extensions of standard particle physics postulate that dark matter may be partially composed of weakly interacting sterile neutrino particles that have so far eluded detection. We use a short (~5...
Faint NUV/FUV Standards from Swift/UVOT, GALEX and SDSS Photometry
Faint NUV/FUV Standards Swift/UVOT GALEX SDSS Photometry
2011/1/11
At present, the precision of deep ultraviolet photometry is somewhat limited by the dearth of faint ultraviolet standard stars. In an effort to improve this situation, we present a uniform catalog of ...
Swift UVOT Grism Spectroscopy of Comets: A First Application to C/2007 N3 (Lulin)
Comets Individual Methods Data Analysis –Techniques Image Spectroscopy – Ultraviolet planetary systems
2010/11/11
We observed comet C/2007 N3 (Lulin) twice on UT 28 January 2009, using the UV grism of the Ultraviolet and Optical Telescope (UVOT) on board the Swift Gamma Ray Burst space observatory. Grism spectros...
X-ray Outflows in the Swift Burst Alert Detected Seyfert 1s
galaxies active—galaxies Seyfert—X-rays galaxies
2010/11/12
Previous surveys of outflows in low-redshift active galactic nuclei (AGN) have relied on the analysis of sources selected primarily for their optical/X-ray brightness, and are therefore biased. Toward...
Spectral Cross-calibration of the Konus-Wind, the Suzaku/WAM, and the Swift/BAT Data using Gamma-Ray Bursts
gamma rays observations
2010/11/11
We report on the spectral cross-calibration results of the Konus-Wind, the Suzaku/WAM, and the Swift/BAT instruments using simultaneously observed gamma-ray bursts (GRBs). This is the first attempt to...
Photometric redshifts for GRB afterglows from GROND and Swift/UVOT
gamma rays bursts Techniques photometric
2010/11/11
Aims. We present a framework to obtain photometric redshifts (photo-zs) for gamma-ray burst afterglows. Using multi-band photometry from GROND and Swift/UVOT, photo-zs are derived for five GRBs for wh...