The Galactic Center region was observed in a series of 7 pointings with the Chandra X-ray Observatory on 5 June 2005 01:44-13:08 UTC. During these observations...
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PublicationNew outbursts of two faint X-ray transients (GRS 1741.9-2853 and XMM J174457-2850.3) located in the Galactic center region
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PublicationNew X-Ray Transient in M31: CXO J004412.4+412548
We report the discovery of a new X-ray source detected in a 5ks observation starting on 2007-02-14.08 UT as part of our ongoing Chandra/HST M31 transient...
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PublicationNew X-Ray Transient in M31: CXOM31 J004059.2+411551
We report the discovery of a previously unseen X-ray point source detected in a 5ks observation starting on 2007-07-05.54 UT as part of our ongoing Chandra/HST...
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PublicationNew X-Ray Transient in M31: CXOM31 J004258.6+411527
We report the discovery of a previously unseen X-ray point source detected in a 10ks observation starting on 2007-06-02.93 UT as part of our ongoing Chandra/HST...
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PublicationNIR counterparts to ULXs (III): completing the photometric survey and selected spectroscopic results
We present results from the remaining sources in our search for near-infrared (NIR) candidate counterparts to ultraluminous X-ray sources (ULXs) within ≃10 Mpc...
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TalkNon-evolution of black hole mass/luminosity ratio, superluminal motions and other pending problems in QSOs
1) López-Corredoira & Gutiérrez (2012, RAA, 12, 249): Extremely luminous QSOs exist at high redshift but they are absent at low redshift. Our analyses show that...
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PublicationNovember 2007 Chandra Observations of X-Ray Transients in M31
As part of our ongoing Chandra/HST M31 transient program we report on two active sources recently detected in two Chandra ACIS observations. Source 1 We present...
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PublicationObservational properties of accretion discs: Precessing and warped?
Over the last 40 years, X-ray astronomy missions have revealed long-term, superorbital periods in a variety of X-ray binaries. These modulations can provide...
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NewsObservers measure how Andromeda’s central black hole is fed
A team of scientists led by the Observatory of Munich University and the Instituto de Astrofísica de Canarias have obtained direct visualization of the process...