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25011. XMM observations of IC 2391 stars
ID:
ivo://CDS.VizieR/J/A+A/430/287
Title:
XMM observations of IC 2391 stars
Short Name:
J/A+A/430/287
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present X-ray spectral and timing analysis of members of the young open cluster IC 2391 observed with the XMM-Newton observatory. We detected 99 X-ray sources by analysing the summed data obtained from MOS1, MOS2 and pn detectors of the EPIC camera; 24 of them are members, or probable members, of the cluster. Stars of all spectral types have been detected, from the early-types to the late-M dwarfs.
25012. XMM observations of {lambda} Ori cluster
ID:
ivo://CDS.VizieR/J/A+A/530/A150
Title:
XMM observations of {lambda} Ori cluster
Short Name:
J/A+A/530/A150
Date:
21 Oct 2021
Publisher:
CDS
Description:
We studied the X-ray properties of the young (~1-8Myr) open cluster around the hot (O8 III) star {lambda} Ori and compared them with those of the similarly-aged sigma Ori cluster to investigate possible effects of the different ambient environment. We analysed an XMM-Newton observation of the cluster using EPIC imaging and low-resolution spectral data. We studied the variability of detected sources, and performed a spectral analysis of the brightest sources in the field using multi-temperature models.
25013. XMM observations of Lockman Hole brightest AGNs
ID:
ivo://CDS.VizieR/J/A+A/444/79
Title:
XMM observations of Lockman Hole brightest AGNs
Short Name:
J/A+A/444/79
Date:
21 Oct 2021
Publisher:
CDS
Description:
This paper presents the results of a detailed X-ray spectral analysis of a sample of 123 X-ray sources detected with XMM-Newton in the Lockman Hole field. This is the deepest observation carried out with XMM-Newton with more that 600ks of good EPIC-pn data. We have spectra with good signal to noise (>500 source counts) for all objects down to 0.2-12keV fluxes of 5x10^-15^erg/cm^2^/s (flux limit of 6x10^-16^erg/cm^2^/s in the 0.5-2 and 2-10keV bands). At the time of the analysis, we had optical spectroscopic identifications for 60% of the sources, 46 being optical type-1 AGN and 28 optical type-2 AGN. Using a single power law model our sources' average spectral slope hardens at faint 0.5-2keV fluxes but not at faint 2-10keV fluxes.
25014. XMM observations of NGC 55
ID:
ivo://CDS.VizieR/J/MNRAS/370/25
Title:
XMM observations of NGC 55
Short Name:
J/MNRAS/370/25
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present an analysis of the X-ray properties of the Magellanic-type galaxy NGC 55 based on two contiguous XMM-Newton observations. We detect a total of 137 X-ray sources in the field of view, down to a flux of ~5x10^-15^erg/cm^2^/s (0.3-6keV), 42 of which are located within the optical confines of the galaxy. On the basis of X-ray colour classification and after correcting for background objects, we conclude that our source sample includes ~20 X-ray binaries (XRBs), five supernova remnants and seven very soft sources (including two good candidate supersoft sources) associated with NGC 55. We also detect an X-ray source coincident with a previously identified globular cluster in NGC 55.
25015. XMM observations of NGC 2547
ID:
ivo://CDS.VizieR/J/MNRAS/367/781
Title:
XMM observations of NGC 2547
Short Name:
J/MNRAS/367/781
Date:
21 Oct 2021
Publisher:
CDS
Description:
The following tables describe the results of a survey for X-ray (0.3-3 keV) sources in the young (30Myr) NGC 2547 open cluster using the XMM-Newton EPIC instrument. Table 1 lists the details of X-ray sources which are correlated with optical cluster members. Table 2 catalogues the cross-identifications with optical catalogues for the sources in Table 1 and derives their X-ray luminosities and X-ray to bolometric flux ratios. Table 3 lists the X-ray properties of sources which are uncorrelated with cluster members. Table 7 lists the correlations between cluster members detected by XMM-Newton and those detected 7 years earlier by the ROSAT HRI instrument, along with the X-ray luminosities and flux ratios as determined by the HRI.
25016. XMM observations of NGC 2808 and NGC 4372
ID:
ivo://CDS.VizieR/J/A+A/480/397
Title:
XMM observations of NGC 2808 and NGC 4372
Short Name:
J/A+A/480/397
Date:
21 Oct 2021
Publisher:
CDS
Description:
Galactic globular clusters harbour binary systems that are detected as faint X-ray sources. These close binaries are thought to play an important role in the stability of the clusters by liberating energy and delaying the inevitable core collapse of globular clusters. The inventory of close binaries and their identification is therefore essential. We present XMM-Newton observations of two Galactic globular clusters: NGC 2808 and NGC 4372. We use X-ray spectral and variability analysis combined with ultra-violet observations made with the XMM-Newton optical monitor and published data from the Hubble Space Telescope to identify sources associated with the clusters. We compare the results of our observations with estimates from population synthesis models.
25017. XMM observations of NGC 2516 stars
ID:
ivo://CDS.VizieR/J/A+A/456/977
Title:
XMM observations of NGC 2516 stars
Short Name:
J/A+A/456/977
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present the characteristics of the X-ray variability of stars in the cluster NGC 2516 as derived from XMM-Newton/EPIC/pn data. The X-ray variations on short (hours), medium (months), and long (years) time scales have been explored. We detected 303 distinct X-ray sources by analysing six EPIC/pn observations; 194 of them are members of the cluster. Stars of all spectral types, from the early-types to the late-M dwarfs, were detected.
25018. XMM observations of sigma Ori cluster
ID:
ivo://CDS.VizieR/J/A+A/446/501
Title:
XMM observations of sigma Ori cluster
Short Name:
J/A+A/446/501
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present the results of an XMM-Newton observation of the young (~2-4Myr) cluster around the hot star sigma Orionis. In a previous paper (Sanz-Forcada et al., 2004A&A...421..715S) we presented the analysis of the RGS spectrum of the central hot star; here we discuss the results of the analysis of the full EPIC field. We have detected 175 X-ray sources, 88 of which have been identified with cluster members, including very low-mass stars down to the substellar limit. We detected eleven new possible candidate members from the 2MASS (Cat. <II/246>) catalogue.
25019. XMM observations of the Lockman Hole
ID:
ivo://CDS.VizieR/J/A+A/479/283
Title:
XMM observations of the Lockman Hole
Short Name:
J/A+A/479/283
Date:
21 Oct 2021
Publisher:
CDS
Description:
The Lockman Hole represents the sky area of lowest Galactic line-of-sight columns density. It was observed by the XMM-Newton X-ray observatory in 18 pointings performed between April 2000 and December 2002. The total exposure time spent on the field was 1.16Ms (EPIC pn detector; EPIC MOS detector: 1.30 Ms). The effective exposure after removal of times of high particle background is 637ks (EPIC pn detector; EPIC MOS detector: 765ks). The catalogue lists positions, count rates, fluxes, hardness ratios, and partial optical classifications of 409 X-ray point sources detected in the central 0.196{deg}2 of the field down to a detection likelihood threshold of 10 (3.9sigma). The analysis was performed using the XMM-Newton SAS data analysis package version 6.0.
25020. XMM obs. of two regions west to {kappa} Ori
ID:
ivo://CDS.VizieR/J/ApJ/820/L28
Title:
XMM obs. of two regions west to {kappa} Ori
Short Name:
J/ApJ/820/L28
Date:
21 Oct 2021
Publisher:
CDS
Description:
X-rays are a powerful probe of activity in early stages of star formation. They allow us to identify young stars even after they have lost the IR signatures of circumstellar disks and provide constraints on their distance. Here, we report on XMM-Newton observations that detect 121 young stellar objects (YSOs) in two fields between L1641S and {kappa} Ori. These observations extend the Survey of Orion A with XMM and Spitzer (SOXS). The YSOs are contained in a ring of gas and dust apparent at millimeter wavelengths, and in far-IR and near-IR surveys. The X-ray luminosity function of the YSOs detected in the two fields indicates a distance of 250-280pc, much closer than the Orion A cloud and similar to distance estimates of {kappa} Ori. We propose that the ring is a 5-8pc diameter shell that has been swept up by {kappa} Ori. This ring contains several groups of stars detected by Spitzer and WISE including one surrounding the Herbig Ae/Be stars V1818 Ori. In this interpretation, the {kappa} Ori ring is one of several shells swept up by massive stars within the Orion Eridanus Superbubble and is unrelated to the southern portion of OrionA/L1641S.

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