Publications (38)
The Megasecond Chandra X-Ray Visionary Project Observation of NGC 3115 (III): luminosity functions of LMXBs and dependence on stellar environments
Dacheng Lin, Jimmy A. Irwin, Ka-wah Wong +7
We have studied the X-ray luminosity function (XLF) of low-mass X-ray binaries (LMXBs) in the nearby lenticular galaxy NGC 3115, using the Megasecond Chandra X-Ray Visionary Projec…
A strongly heated neutron star in the transient Z source MAXI J0556-332
Jeroen Homan, Joel K. Fridriksson, Rudy Wijnands +5
We present Chandra, XMM-Newton, and Swift observations of the quiescent neutron star in the transient low-mass X-ray binary MAXI J0556-332. Observations of the source made during o…
Suzaku and BeppoSAX X-ray Spectra of the Persistently Accreting Neutron-Star Binary 4U 1705-44
Dacheng Lin, Ronald A. Remillard, Jeroen Homan
We present an analysis of the broad-band spectra of 4U~1705--44 obtained with {\it Suzaku} in 2006--2008 and by {\it BeppoSAX} in 2000. The source exhibits two distinct states: the…
Type I X-ray Bursts from the Neutron-star Transient XTE J1701-462
Dacheng Lin, Diego Altamirano, Jeroen Homan +3
The neutron-star X-ray transient XTE J1701-462 was observed for 3 Ms with \xte during its 2006-2007 outburst. Here we report on the discovery of three type-I X-ray bursts fro…
Classification of X-ray Sources in the XMM-Newton Serendipitous Source Catalog: Objects of Special Interest
Dacheng Lin, Natalie A. Webb, Didier Barret
We analyze 18 sources that were found to show interesting properties of periodicity, very soft spectra and/or large long-term variability in X-rays in our project of classification…
The Spectral Evolution along the Z track of the Bright Neutron Star X-ray Binary GX 17+2
Dacheng Lin, Ronald A. Remillard, Jeroen Homan +1
Z sources are bright neutron-star X-ray binaries, accreting at around the Eddington limit. We analyze the 68 RXTE observations (270 ks) of Sco-like Z source GX 17+2 made between 19…
Discovery of the Candidate Off-nuclear Ultrasoft Hyper-luminous X-ray Source 3XMM J141711.1+522541
Dacheng Lin, Eleazar R. Carrasco, Natalie A. Webb +8
We report the discovery of an off-nuclear ultrasoft hyper-luminous X-ray source candidate 3XMM J141711.1+522541 in the inactive S0 galaxy SDSS J141711.07+522540.8 (z=0.41827, d_L=2…
Discovery of an Ultrasoft X-ray Transient Source in the 2XMM Catalog: a Tidal Disruption Event Candidate
Dacheng Lin, Eleazar R. Carrasco, Dirk Grupe +3
We have discovered an ultrasoft X-ray transient source, 2XMMi J184725.1-631724, which was detected serendipitously in two XMM-Newton observations in the direction of the center of…
Follow-up Observations of the Prolonged, super-Eddington, Tidal Disruption Event Candidate 3XMM~J150052.0+015452: the Slow Decline Continues
Dacheng Lin, Olivier Godet, Natalie A. Webb +7
The X-ray source 3XMM~J150052.0+015452 was discovered as a spectacular tidal disruption event candidate during a prolonged ( yrs) outburst (Lin et al. 2017). It exhibited uniq…
Discovery of a Highly Variable Dipping Ultraluminous X-ray source in M94
Dacheng Lin, Jimmy A. Irwin, Natalie A. Webb +2
We report the discovery of a new ultraluminous X-ray source (ULX) 2XMM J125048.6+410743 within the spiral galaxy M94. The source has been observed by ROSAT, Chandra, and XMM-Newton…
Classification of X-ray Sources in the XMM-Newton Serendipitous Source Catalog
Dacheng Lin, Natalie A. Webb, Didier Barret
We carry out classification of 4330 X-ray sources in the 2XMMi-DR3 catalog. They are selected under the requirement of being a point source with multiple XMM-Newton observations an…
X-ray Variability and Hardness of ESO 243-49 HLX-1: Clear Evidence for Spectral State Transitions
Mathieu Servillat, Sean A. Farrell, Dacheng Lin +3
The ultra-luminous X-ray (ULX) source ESO 243-49 HLX-1 currently provides the strongest evidence for the existence of intermediate mass black holes. We conduct an ongoing monitorin…
The Megasecond Chandra X-Ray Visionary Project Observation of NGC 3115 (II): properties of point sources
Dacheng Lin, Jimmy A. Irwin, Ka-wah Wong +7
We have carried out an in-depth study of low-mass X-ray binaries (LMXBs) detected in the nearby lenticular galaxy NGC 3115, using the Megasecond Chandra X-Ray Visionary Project obs…
Multiwavelength Follow-up Observations of the Tidal Disruption Event Candidate 2XMMi J184725.1-631724
Dacheng Lin, Jay Strader, Eleazar R. Carrasco +5
The ultrasoft X-ray flare 2XMMi J184725.1-631724 was serendipitously detected in two XMM-Newton observations in 2006 and 2007, with a peak luminosity of 6X10^43 erg/s. It was sugge…
Dual perspectives on GX 17+2: a simultaneous NICER and NuSTAR study
Malu Sudha, Renee M. Ludlam, Jeroen Homan +3
We performed the first simultaneous NICER & NuSTAR spectral and timing study of the Sco-like Z source GX 17+2. The source traced the full Z track during four observations. We detec…
The SLUGGS Survey: HST/ACS Mosaic Imaging of the NGC 3115 Globular Cluster System
Zachary G. Jennings, Jay Strader, Aaron J. Romanowsky +6
We present HST/ACS and photometry and half-light radii measurements of 360 globular cluster (GC) candidates around the nearby S0 galaxy NGC 3115. We also includ…
An Ultraluminous Supersoft Source in a Dwarf Galaxy of Abell 85: An Intermediate-Mass Black Hole Candidate
Marko MiÄiÄ, Jimmy A. Irwin, Dacheng Lin
We study a large sample of dwarf galaxies using archival Chandra X-ray observations, with the aim of detecting accreting intermediate-mass black holes (IMBHs). IMBHs are expected t…
RBS 1032: A Tidal Disruption Event in Another Dwarf Galaxy?
W. Peter Maksym, Dacheng Lin, Jimmy Irwin
RBS 1032 is a supersoft (), luminous ( erg/s) ROSAT PSPC source which has been associated with an inactive dwarf galaxy at , SDSS J114726.69+494257.8…
Discovery of Three Candidate Magnetar-powered Fast X-ray Transients from Chandra Archival Data
Dacheng Lin, Jimmy A. Irwin, Edo Berger +1
It was proposed that a remnant stable magnetar could be formed in a binary neutron-star merger, leading to a fast X-ray transient (FXT) that can last for thousands of seconds. Rece…
A test of the nature of the Fe K Line in the neutron star low-mass X-ray binary Serpens X-1
Chia-Ying Chiang, Edward M. Cackett, Jon M. Miller +12
Broad Fe K emission lines have been widely observed in the X-ray spectra of black hole systems, and in neutron star systems as well. The intrinsically narrow Fe K fluorescent line…
The Rates of type I X-ray Bursts from Transients Observed with RXTE: Evidence for Black Hole Event Horizons
Ronald A. Remillard, Dacheng Lin, Randall L. Cooper +1
We measure the rates of type I X-ray bursts, as a function of the bolometric luminosity, from a likely complete sample of 37 non-pulsing transients (1996-2004). Our goals are to te…
Absence of reflection features in NuSTAR spectra of the luminous neutron star X-ray binary GX 5-1
Jeroen Homan, James F. Steiner, Dacheng Lin +4
We present NuSTAR observations of the luminous neutron star low-mass X-ray binary (NS LMXB) and Z source GX 5-1. During our three observations made with separations of roughly two…
A luminous X-ray outburst from an intermediate-mass black hole in an off-centre star cluster
Dacheng Lin, Jay Strader, Eleazar R. Carrasco +13
A unique signature for the presence of massive black holes in very dense stellar regions is occasional giant-amplitude outbursts of multiwavelength radiation from tidal disruption…
XMM-Newton Observations of the TeV γ-ray Source HESS J1804-216
Dacheng Lin, Natalie A. Webb, Didier Barret
We have analyzed three XMM-Newton observations of the central part of the unidentified TeV γ-ray source HESS J1804-216. We focus on two X-ray sources 2XMMi J180442.0-214221 (Src 1…
A ~3.8 hour Periodicity from an Ultrasoft Active Galactic Nucleus Candidate
Dacheng Lin, Jimmy A. Irwin, Olivier Godet +2
Very few galactic nuclei are found to show significant X-ray quasi-periodic oscillations (QPOs). After carefully modeling the noise continuum, we find that the ~3.8 hr QPO in the u…
Probing the Cosmological Evolution of Super-massive Black Holes using Tidal Disruption Flares
Dheeraj R. Pasham, Dacheng Lin, Richard Saxton +5
The question of how supermassive black holes (SMBHs) grow over cosmic time is a major puzzle in high-energy astrophysics. One promising approach to this problem is via the study of…
Hard X-ray Emission from the M87 AGN Detected with NuSTAR
Ka-Wah Wong, Rodrigo S. Nemmen, Jimmy A. Irwin +1
M87 hosts a 3-6 billion solar mass black hole with a remarkable relativistic jet that has been regularly monitored in radio to TeV bands. However, hard X-ray emission \gtrsim 10keV…
NuSTAR Observation of the TeV-Detected Radio Galaxy 3C 264: Core Emission and the Hot Accretion Flow Contribution
Ka-Wah Wong, Colin M. Steiner, Allison M. Blum +4
3C 264 is one of the few FRI radio galaxies with detected TeV emission. It is a low-luminosity AGN (LLAGN) and is generally associated with a radiatively inefficient accretion flow…
Rapid dimming followed by a state transition: a study of the highly variable nuclear transient AT 2019avd over 1000+ days
Yanan Wang, Dheeraj R. Pasham, Diego Altamirano +16
The tidal disruption of a star around a supermassive black hole (SMBH) offers a unique opportunity to study accretion onto a SMBH on a human-timescale. We present results from our…
Large Decay of X-ray Flux in 2XMM J123103.2+110648: Evidence for a Tidal Disruption Event
Dacheng Lin, Olivier Godet, Luis C. Ho +3
The X-ray source 2XMM J123103.2+110648 was previously found to show pure thermal X-ray spectra and a ~3.8 hr periodicity in three XMM-Newton X-ray observations in 2003-2005, and th…
Ultraluminous X-ray bursts in two ultracompact companions to nearby elliptical galaxies
Jimmy A. Irwin, W. Peter Maksym, Gregory R. Sivakoff +8
An X-ray flaring source was found near the galaxy NGC 4697. Two flares were seen, separated by four years. The flux increased by a factor of 90 on a timescale of about one minute.…
XTE J1701-462 and its Implications for the Nature of Subclasses in Low-Magnetic-Field Neutron Star Low-Mass X-Ray Binaries
Jeroen Homan, Michiel van der Klis, Joel K. Fridriksson +8
We report on an analysis of RXTE data of the transient neutron star low-mass X-ray binary (NS-LMXB) XTE J1701-462, obtained during its 2006-2007 outburst. The X-ray properties of t…
An Ultrasoft X-ray Flare from 3XMM J152130.7+074916: a Tidal Disruption Event Candidate
Dacheng Lin, Peter W. Maksym, Jimmy A. Irwin +6
We report on the discovery of an ultrasoft X-ray transient source, 3XMM J152130.7+074916. It was serendipitously detected in an XMM-Newton observation on 2000 August 23, and its lo…
Evaluating Spectral Models and the X-ray States of Neutron-Star X-ray Transients
Dacheng Lin, Ronald A. Remillard, Jeroen Homan
We propose a hybrid model to fit the X-ray spectra of atoll-type X-ray transients in the soft and hard states. This model uniquely produces luminosity tracks that are proportional…
Spectral States of XTE J1701-462: Link between Z and Atoll Sources
Dacheng Lin, Ronald A. Remillard, Jeroen Homan
We have analyzed 866 RXTE observations of the 2006-2007 outburst of the accreting neutron star XTE J1701-462, during which the source evolves from super-Eddington luminosities to q…
A likely decade-long sustained tidal disruption event
Dacheng Lin, James Guillochon, S. Komossa +11
Multiwavelength flares from tidal disruption and accretion of stars can be used to find and study otherwise dormant massive black holes in galactic nuclei. Previous well-monitored…
Tidal disruption events and quasi periodic eruptions
Natalie A. Webb, Didier Barret, Olivier Godet +4
Tidal disruption events (TDEs) occur when a star passes close to a massive black hole, so that the tidal forces of the black hole exceed the binding energy of a star and cause it t…
Multiwavelength Follow-up of the Hyperluminous Intermediate-mass Black Hole Candidate 3XMM J215022.4-055108
Dacheng Lin, Jay Strader, Aaron J. Romanowsky +6
We recently discovered the X-ray/optical outbursting source 3XMM J215022.4-055108. It was best explained as the tidal disruption of a star by an intermediate-mass black hole of mas…