Distribution and Structure of Matter in and around Galaxies (2009)
Schulz, Norbert S., Allen, Glenn, Bautz, Mark W., Canizares, Claude C., Davis, John, Dewey, Dan, ...
Understanding the origins and distribution of matter in the Universe is one of the most important quests in physics and astronomy. Themes range from astro-particle physics to chemical evolution in...
X-Ray Absorption By WHIM in the Sculptor Wall (2009)
Buote, David A., Zappacosta, Luca, Fang, Taotao, Humphrey, Philip J., Gastaldello, Fabio, Tagliaferri, Gianpiero
We present XMM RGS and Chandra LETG observations of the blazar, H 2356-309, located behind the Sculptor Wall, a large-scale galaxy structure expected to harbor high-density Warm-Hot Intergalactic...
Kaufmann, Tobias, Bullock, James S., Maller, Ariyeh H., Fang, Taotao, Wadsley, James
We present a pair of high-resolution smoothed particle hydrodynamics (SPH) simulations that explore the evolution and cooling behavior of hot gas around Milky-Way size galaxies. The simulations...
Rotation and Turbulence of the Hot ICM in Galaxy Clusters (2008)
Fang, Taotao, Humphrey, Philip J., Buote, David A.
Cosmological simulations of galaxy clusters typically find that the weight of a cluster at a given radius is not balanced entirely by the thermal gas pressure of the hot ICM, with theoretical studies...
Correlations between O VI Absorbers and Galaxies at Low Redshift (2008)
Ganguly, Rajib, Cen, Renyue, Fang, Taotao, Sembach, Kenneth
We investigate the relationship between galaxies and metal-line absorption systems in a large-scale cosmological simulation with galaxy formation. Our detailed treatment of metal enrichment and...
Simulating the Gaseous Halos of Galaxies (2008)
Kaufmann, Tobias, Bullock, James S., Maller, Ari, Fang, Taotao
Observations of local X-ray absorbers, high-velocity clouds, and distant quasar absorption line systems suggest that a significant fraction of baryons may reside in multi-phase, low-density,...
Gamma-Ray Bursts May Be Biased Tracers of Star Formation (2007)
Based on a simulation of galaxy formation in the standard cosmological model, we suggest that a consistent picture for Gamma-Ray Bursts and star formation may be found that is in broad agreement with...
Confirming the Detection of an Intergalactic X-ray Absorber Toward PKS 2155-304 (2007)
Fang, Taotao, Canizares, Claude R., Yao, Yangsen
We present new observations on PKS 2155-304 with the Chandra Low Energy Transmission Grating Spectrometer (LETG), using the Advanced CCD Imaging Spectrometer (ACIS). We confirm the detection of an...
AEGIS: Chandra observation of DEEP2 galaxy groups and clusters (2007)
Fang, Taotao, Gerke, Brian F., Davis, David S., Newman, Jeffrey A., Davis, Marc, Nandra, Kirpal, ...
We present a 200 ks Chandra observation of seven spectroscopically selected, high-redshift (0.75 < z < 1.03) galaxy groups and clusters discovered by the DEEP2 Galaxy Redshift Survey in the...
Where Are the Baryons? III: Non-Equilibrium Effects and Observables (2005)
Numerical simulations of the intergalactic medium have shown that at the present epoch a significant fraction (40-50%) of the baryonic component should be found in the (T~10^6K) Warm-Hot...
A Galactic Origin for the Local Ionized X-ray Absorbers (2005)
Fang, Taotao, McKee, Christopher, Canizares, Claude, Wolfire, Mark
Recent Chandra and XMM observations of distant quasars have shown strong local (z~0) X-ray absorption lines from highly ionized gas, primarily He-like oxygen. The nature of these X-ray absorbers,...
Fang, Taotao, Canizares, Claude R., Marshall, Herman L.
We present a survey of six low to moderate redshift quasars with Chandra and XMM-Newton. The primary goal is to search for the narrow X-ray absorption lines produced by highly ionized metals in the...
Signature of Galactic Outflows as Absorption-Free Gaps in the Ly-alpha Forest (2005)
Fang, Taotao, Loeb, Abraham, Tytler, David, Kirkman, David, Suzuki, Nao
Powerful outflows from star-forming galaxies are expected to push away the neutral intergalactic medium (IGM) around those galaxies, and produce absorption-free gaps in the Ly-alpha forest. We...
Probing the Local Group Medium Toward Mkn 421 with Chandra and FUSE (2005)
Williams, Rik J., Mathur, Smita, Nicastro, Fabrizio, Elvis, Martin, Drake, Jeremy J., Fang, Taotao, ...
We report the detection of highly-ionized gas at z~0 seen in resonant UV and X-ray absorption lines toward the z=0.03 blazar Mkn 421. A total of 13 X-ray and 3 UV lines were measured (or upper limits...
Chandra Detection of the First X-ray Forest along the Line of Sight To Mkn 421 (2005)
Nicastro, Fabrizio, Mathur, Smita, Elvis, Martin, Drake, Jeremy, Fiore, Fabrizio, Fang, Taotao, ...
We present the first >=3.5 sigma (conservative) or >=5.8 sigma (sum of lines significance) detection of two Warm-Hot Intergalactic Medium (WHIM) filaments at z>0, which we find along the line of...
Hot Baryons and the Distribution of Metals in the Intergalactic Medium (2005)
Tumlinson, Jason, Fang, Taotao
We use the observed number and column-density distributions of intergalactic O VI absorbers to constrain the distribution of metals in the low-redshift intergalactic medium (IGM). In this simple...
Star-forming galaxies in the sloan digital sky survey - the view from Pittsburgh (2005)
Schulte-Ladbeck, Regina E., Miller, Christopher J., Hopp, Ulrich, Hopkins, Andrew, Nichol, Robert C., Voges, Wolfgang, ...
Transition From Population III to Population II Stars (2004)
The transition from Population III to Population II stars is determined by the presence of a sufficient amount of metals, in particular, oxygen and carbon. The vastly different yields of these...
Star-Forming Galaxies in the Sloan Digital Sky Survey -- The View from Pittsburgh (2003)
Schulte-Ladbeck, Regina E., Miller, Christopher J., Hopp, Ulrich, Hopkins, Andrew, Nichol, Robert C., Voges, Wolfgang, ...
We used data from the Data Release 1 (DR1) of the Sloan Digital Sky Survey (SDSS) in order to define a catalog of about 13,000 star-forming galaxies (SFG). We discuss the results of two projects....
Recent FUSE and STIS observations of OVI absorption at low redshift along the sightline to distant quasars have been interpreted as the signature of a warm-hot diffuse component of the intergalactic...
Exploring the Damped Lyman-alpha Clouds with AXAF (1998)
Fang, Taotao, Canizares, Claude R.
The High Energy Transmission Grating (HETG) Spectrometer on the Advanced X-ray Astrophysics Facility (AXAF) (scheduled for launch in August, 1998) will provide a new tool for the study of absorption...
Probing the hot IGM with AXAF (1998)
Canizares, Claude R., Fang, Taotao
The transmission grating spectrometers on AXAF have sufficient sensitivity and energy resolution to detect resonance X-ray absorption lines in the spectra of distant quasars. Such lines would be...