C. Motch
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View article: Isolated Neutron Stars as Science Validation for <scp>XMM2ATHENA</scp>: Ensuring Robust Data for Future X‐Ray Astronomy
Isolated Neutron Stars as Science Validation for <span>XMM2ATHENA</span>: Ensuring Robust Data for Future X‐Ray Astronomy Open
The discovery of radio‐quiet, x‐ray thermally emitting isolated neutron stars (XINSs) in the ROSAT All‐Sky Survey revealed a previously overlooked component of the neutron star population. Advancements in x‐ray instrumentation and the avai…
View article: X-raying the zeta Tau binary system
X-raying the zeta Tau binary system Open
The Be star zeta Tau was recently reported to be a gamma Cas analog; that is, it displays an atypical (bright and hard) X-ray emission. The origin of these X-rays remains debated.The first X-ray observations indicated a very large absorpti…
View article: X-raying the <i>ζ</i> Tau binary system
X-raying the <i>ζ</i> Tau binary system Open
Context. The Be star ζ Tau was recently reported to be a γ Cas analog; that is, it displays an atypical (bright and hard) X-ray emission. The origin of these X-rays remains debated. Aims. The first X-ray observations indicated a very large…
View article: A multiband look at ultraluminous X-ray sources in NGC 7424
A multiband look at ultraluminous X-ray sources in NGC 7424 Open
We studied the multiband properties of two ultraluminous X-ray sources (2CXO J225728.9−410211 = X-1 and 2CXO J225724.7−410343 = X-2) and their surroundings, in the spiral galaxy NGC 7424. Both sources have approached X-ray luminosities LX …
View article: A multiband look at ultraluminous X-ray sources in NGC 7424
A multiband look at ultraluminous X-ray sources in NGC 7424 Open
We studied the multiband properties of two ultraluminous X-ray sources (2CXO J225728.9-410211 = X-1 and 2CXO J225724.7-410343 = X-2) and their surroundings, in the spiral galaxy NGC 7424. Both sources have approached X-ray luminosities L_{…
View article: ζ Tau, a Post-interaction Binary
ζ Tau, a Post-interaction Binary Open
Be stars are usually thought to be born in binary interactions. The presence of the companion has been proposed to play a role in the peculiar X-ray emission recorded for a subgroup of Be stars called the γ Cas analogs. In this contributio…
View article: XMM2ATHENA, the H2020 project to improve XMM‐Newton analysis software and prepare for Athena
XMM2ATHENA, the H2020 project to improve XMM‐Newton analysis software and prepare for Athena Open
XMM‐Newton , a European Space Agency observatory, has been observing the X‐ray, ultra‐violet, and optical sky for 23 years. During this time, astronomy has evolved from mainly studying single sources to populations and from a single wavele…
View article: XMM2ATHENA, the H2020 project to improve XMM-Newton analysis software and prepare for Athena
XMM2ATHENA, the H2020 project to improve XMM-Newton analysis software and prepare for Athena Open
XMM-Newton, a European Space Agency observatory, has been observing the X-ray, ultra-violet and optical sky for 23 years. During this time, astronomy has evolved from mainly studying single sources to populations and from a single waveleng…
View article: Les étoiles sdO et les émissions en rayons X particulières
Les étoiles sdO et les émissions en rayons X particulières Open
Some Be stars exhibit a bright and extremely hard X-ray emission, whose origin is debated. In this context, it has been advocated that stripped helium-star sdO companions could play a significant role. Using high quality datasets, we exami…
View article: <i>XMM-Newton</i> and SRG/eROSITA observations of the isolated neutron star candidate 4XMM <i>J</i>022141.5−735632
<i>XMM-Newton</i> and SRG/eROSITA observations of the isolated neutron star candidate 4XMM <i>J</i>022141.5−735632 Open
We report the results of follow-up investigations of a possible new thermally emitting isolated neutron star (INS), 4XMM J 022141.5−735632 , using observations from XMM-Newton and Spectrum Roentgen Gamma (SRG) eROSITA. The analysis is comp…
View article: The X-ray emission of Be+stripped star binaries★
The X-ray emission of Be+stripped star binaries★ Open
Using observations from Chandra, Swift, and XMM-Newton, we investigate the high-energy properties of all known (18) Be+sdO systems as well as seven additional Be binaries suspected to harbour stripped stars. The observed X-ray properties a…
View article: XMM-Newton and SRG/eROSITA observations of the isolated neutron star candidate 4XMM J022141.5-735632
XMM-Newton and SRG/eROSITA observations of the isolated neutron star candidate 4XMM J022141.5-735632 Open
We report the results of follow-up investigations of a possible new thermally emitting isolated neutron star (INS), 4XMM J022141.5-735632, using observations from XMM-Newton and Spectrum Roentgen Gamma (SRG) eROSITA. The analysis is comple…
View article: The X-ray Emission of<i>γ</i>Cassiopeiae During the 2020–2021 disc eruption
The X-ray Emission of<i>γ</i>Cassiopeiae During the 2020–2021 disc eruption Open
Context. γ Cas is known for its unusually hard and intense X-ray emission. This emission could trace accretion by a compact companion, wind interaction with a hot sub-dwarf companion, or magnetic interaction between the star and its Be dec…
View article: Deciphering hard disks
Deciphering hard disks Open
Some Be stars were found to emit very bright and extremely hard thermal X-rays. This so-called γ Cas -star category is rapidly growing, showing that the phenomenon is far from being uncommon and its consequences on Be population feedback s…
View article: X-ray response to disc evolution in two γ Cas stars
X-ray response to disc evolution in two γ Cas stars Open
The Hα emission of a set of southern γ Cas stars was monitored since 2019, with the aim of detecting transition events and examining how their peculiar X-ray emission would react in such cases. Two stars, namely HD 119682 and V767 Cen, wer…
View article: A <i>Chandra</i> Virgo cluster survey of spiral galaxies – I. Introduction to the survey and a new ULX sample
A <i>Chandra</i> Virgo cluster survey of spiral galaxies – I. Introduction to the survey and a new ULX sample Open
We present an analysis of the ultraluminous X-ray source (ULX) population in 75 Virgo cluster late-type galaxies, including all those with a star formation rate ≳1 M⊙ yr−1 and a representative sample of the less star forming ones. This stu…
View article: Central X-Ray Point Sources Found to Be Abundant in Low-mass, Late-type Galaxies Predicted to Contain an Intermediate-mass Black Hole
Central X-Ray Point Sources Found to Be Abundant in Low-mass, Late-type Galaxies Predicted to Contain an Intermediate-mass Black Hole Open
Building upon three late-type galaxies in the Virgo cluster with both a predicted black hole mass of less than ∼10 5 M ⊙ and a centrally located X-ray point source, we reveal 11 more such galaxies, more than tripling the number of active i…
View article: The ultraluminous X-ray source bubble in NGC 5585
The ultraluminous X-ray source bubble in NGC 5585 Open
Some ultraluminous X-ray sources (ULXs) are surrounded by collisionally ionized bubbles, larger and more energetic than supernova remnants: they are evidence of the powerful outflows associated with super-Eddington X-ray sources. We illust…
View article: The<i>XMM-Newton</i>serendipitous survey
The<i>XMM-Newton</i>serendipitous survey Open
Context. Sky surveys produce enormous quantities of data on extensive regions of the sky. The easiest way to access this information is through catalogues of standardised data products. XMM-Newton has been surveying the sky in the X-ray, u…
View article: The<i>XMM-Newton</i>serendipitous survey
The<i>XMM-Newton</i>serendipitous survey Open
Context. The XMM-Newton Survey Science Centre Consortium (SSC) develops software in close collaboration with the Science Operations Centre to perform a pipeline analysis of all XMM-Newton observations. In celebration of the twentieth anniv…
View article: The XMM-Newton serendipitous survey. X: The second source catalogue from overlapping XMM-Newton observations and its long-term variable content
The XMM-Newton serendipitous survey. X: The second source catalogue from overlapping XMM-Newton observations and its long-term variable content Open
The XMM-Newton Survey Science Centre Consortium (SSC) develops software in close collaboration with the Science Operations Centre to perform a pipeline analysis of all XMM-Newton observations. In celebration of the 20th launch anniversary,…
View article: Three discoveries of γ Cas analogues from dedicated XMM–Newton observations of Be stars
Three discoveries of γ Cas analogues from dedicated XMM–Newton observations of Be stars Open
In the last years, a peculiarity of some Be stars – their association with unusually hard and intense X-ray emission – was shown to extend beyond a mere few cases. In this paper, we continue our search for new cases by performing a limited…
View article: Tidal disruption events: Past, present, and future
Tidal disruption events: Past, present, and future Open
The tidal disruption of a star by a nuclear supermassive black hole was predicted in the 1970s and first confirmed by soft X‐ray flares seen from quiescent galaxies in the ROSAT all‐sky survey. We report here on the discovery of a new cand…
View article: Accretion in Stellar-Mass Black Holes at High X-ray Spectral Resolution
Accretion in Stellar-Mass Black Holes at High X-ray Spectral Resolution Open
Accretion disks around stellar-mass black holes offer unique opportunities to study the fundamental physics of standard thin disks, super-Eddington disks, and structure that may be connected to flux variability. These local analogues of ac…
View article: Optical IFU spectroscopy of a bipolar microquasar jet in NGC 300
Optical IFU spectroscopy of a bipolar microquasar jet in NGC 300 Open
We recently reported the discovery of a candidate jet-driving microquasar\n(S10) in the nearby spiral galaxy NGC 300. However, in the absence of kinematic\ninformation, we could not reliably determine the jet power or the dynamical age\nof…
View article: Optical IFU spectroscopy of a bipolar microquasar jet in NGC 300
Optical IFU spectroscopy of a bipolar microquasar jet in NGC 300 Open
We recently reported the discovery of a candidate jet-driving microquasar (S10) in the nearby spiral galaxy NGC 300. However, in the absence of kinematic information, we could not reliably determine the jet power or the dynamical age of th…
View article: The <i>XMM-Newton</i> serendipitous survey
The <i>XMM-Newton</i> serendipitous survey Open
Context . XMM-Newton has observed the X-ray sky since early 2000. The XMM-Newton Survey Science Centre Consortium has published catalogues of X-ray and ultraviolet sources found serendipitously in the individual observations. This series i…
View article: A deep <i>XMM-Newton</i> look on the thermally emitting isolated neutron star RX J1605.3+3249
A deep <i>XMM-Newton</i> look on the thermally emitting isolated neutron star RX J1605.3+3249 Open
Previous XMM-Newton observations of the thermally emitting isolated neutron star RX J1605.3+3249 provided a candidate for a shallow periodic signal and evidence of a fast spin down, which suggested a high dipolar magnetic field and an evol…
View article: A newly discovered double–double candidate microquasar in NGC 300
A newly discovered double–double candidate microquasar in NGC 300 Open
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View article: A newly discovered double-double candidate microquasar in NGC 300
A newly discovered double-double candidate microquasar in NGC 300 Open
We present the discovery of a powerful candidate microquasar in NGC 300, associated with the S 10 optical nebula (previously classified as a supernova remnant). Chandra images show four discrete X-ray knots aligned in the plane of the sky …