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17671. XMM-Newton 2XMMi-DR3 Selected Source Detections Catalog
ID:
ivo://nasa.heasarc/xmmssclwbd
Title:
XMM-Newton 2XMMi-DR3 Selected Source Detections Catalog
Short Name:
XMMSSCLWBD
Date:
14 Feb 2025
Publisher:
NASA/GSFC HEASARC
Description:
The authors have carried out a classification of 4,330 X-ray sources in the 2XMMi-DR3 catalog. The sources were selected under the requirement of being a point source with multiple XMM-Newton observations and at least one detection with a signal-to-noise ratio larger than 20. For about one-third of the sources, the authors are able to obtain reliable source types from the literature. They mostly correspond to various types of stars (611), active galactic nuclei (AGNs, 753), and compact object systems (138) containing white dwarfs, neutron stars, and stellar-mass black holes. The authors find that about 99% of stars can be separated from other source types based on their low X-ray-to-IR flux ratios and frequent X-ray flares. AGNs have remarkably similar X-ray spectra, with the power-law photon index centered around 1.91 +/- 0.31, and their 0.2-4.5 keV flux long-term variation factors have a median of 1.48, with 98.5% being less than 10. In contrast, 70% of compact object systems can be very soft or hard, highly variable in X-rays, and/or have very large X-ray-to-IR flux ratios, separating them from AGNs. Using these results, the authors derive a source type classification scheme to classify the other sources and find 644 candidate stars, 1,376 candidate AGNs, and 202 candidate compact object systems, whose false identification probabilities are estimated to be about 1%, 3%, and 18%, respectively. There are still 320 sources associated with nearby galaxies and 151 in the Galactic plane, which the authors expect to be mostly compact object systems or background AGNs. There are also 100 candidate ultraluminous X-ray sources. They are found to be much less variable than other accreting compact objects. This table contains the list of 19,637 detections of the 4,330 unique X-ray sources which comprise the authors' sample. The list of 4,330 unique X-ray sources and their classifications is also available as the HEASARC XMMSSCLWBS table. This table was created by the HEASARC in October 2012 based on an electronic version of Table 3 from the reference paper which was obtained from the ApJ web site. This is a service provided by NASA HEASARC .
17672. XMM-Newton X-ray sources in NGC 6553
ID:
ivo://CDS.VizieR/J/ApJ/738/129
Title:
XMM-Newton X-ray sources in NGC 6553
Short Name:
J/ApJ/738/129
Date:
21 Oct 2021
Publisher:
CDS
Description:
This paper reports the search for quiescent low-mass X-ray binaries (qLMXBs) in the globular cluster (GC) NGC 6553 using an XMM-Newton observation designed specifically for that purpose. We spectrally identify one candidate qLMXB in the core of the cluster, based on the consistency of the spectrum with a neutron star H-atmosphere model at the distance of NGC 6553. Specifically, the best-fit radius found using the three XMM European Photon Imaging Camera spectra is R_NS_=6.3^+2.3^_-0.8_ km (for M_NS_=1.4 M_{sun}_) and the best-fit temperature is kT_eff_=136^+21^_-34_ eV. Both physical parameters are in accordance with typical values of previously identified qLMXBs in GC and in the field, i.e., R_NS_~5-20 km and kT_eff_=50-150 eV. A power-law (PL) component with a photon index {Gamma}=2.1^+0.5^_-0.8_ is also required for the spectral fit and contributes ~33% of the total flux of the X-ray source. A detailed analysis supports the hypothesis that the PL component originates from nearby sources in the core, unresolved with XMM. The analysis of an archived Chandra observation provides marginal additional support to the stated hypothesis. Finally, a catalog of all the sources detected within the XMM field of view is presented here.
17673. XMM northern disc of M31 sources
ID:
ivo://CDS.VizieR/J/A+A/620/A28
Title:
XMM northern disc of M31 sources
Short Name:
J/A+A/620/A28
Date:
21 Oct 2021
Publisher:
CDS
Description:
We carried out new observations of two fields in the star-forming northern ring of M31 with XMM-Newton with two exposures of about 100 ks each. A previous XMM-Newton survey of the entire M31 galaxy revealed extended diffuse X-ray emission in these regions. We study the population of X-ray sources in the northern disc of M31 by compiling a complete list of X-ray sources down to a sensitivity limit of ~7x10^34^erg/s (0.5-2.0keV) and improve the identification of the X-ray sources. The major objective of the observing programme was the study of the hot phase of the interstellar medium (ISM) in M31. The analysis of the diffuse emission and the study of the ISM is presented in a separate paper. We analysed the spectral properties of all detected sources using hardness ratios and spectra if the statistics were high enough. We also checked for variability. In order to classify the sources detected in the new deep XMM-Newton observations, we cross-correlated the source list with the source catalogue of a new survey of the northern disc of M31 carried out with the Chandra X-ray Observatory and the Hubble Space Telescope (Panchromatic Hubble Andromeda Treasury, PHAT) as well as with other existing catalogues We detected a total of 389 sources in the two fields of the northern disc ofM31 observed with XMM-Newton.We identified 43 foreground stars and candidates and 50 background sources. Based on the comparison to the results of the Chandra/PHAT survey, we classify 24 hard X-ray sources as new candidates for X-ray binaries (XRBs). In total, we identified 34 X-ray binaries and candidates and 18 supernova remnants (SNRs) and candidates. We studied the spectral properties of the four brightest SNRs and confirmed five new X-ray SNRs. Three of the four SNRs, for which a spectral analysis was performed, show emission mainly below 2 keV, which is consistent with shocked ISM. The spectra of two of them also require an additional component with a higher temperature. The SNR [SPH11] 1535 has a harder spectrum and might suggest that there is a pulsar-wind nebula inside the SNR. For all SNRs in the observed fields, we measured the X-ray flux or calculated upper limits. We also carried out short-term and long-term variability studies of the X-ray sources and found five new sources showing clear variability. In addition, we studied the spectral properties of the transient source SWIFT J004420.1+413702, which shows significant variation in flux over a period of seven months (June 2015 to January 2016) and associated change in absorption. Based on the likely optical counterpart detected in the Chandra/PHAT survey, the source is classified as a low-mass X-ray binary.
17674. XMM observations in M8 and NGC6530
ID:
ivo://CDS.VizieR/J/A+A/395/499
Title:
XMM observations in M8 and NGC6530
Short Name:
J/A+A/395/499
Date:
21 Oct 2021
Publisher:
CDS
Description:
We report the results of an XMM-Newton observation of the Lagoon Nebula (M 8). Our EPIC images of this region reveal a cluster of point sources, most of which have optical counterparts inside the very young open cluster NGC 6530. The bulk of these X-ray sources are probably associated with low and intermediate mass pre-main sequence stars.
17675. XMM observations of {alpha} Per
ID:
ivo://CDS.VizieR/J/AJ/145/143
Title:
XMM observations of {alpha} Per
Short Name:
J/AJ/145/143
Date:
21 Oct 2021
Publisher:
CDS
Description:
We report on the analysis of an archival observation of part of the {alpha} Persei cluster obtained with XMM-Newton. We detected 102 X-ray sources in the band 0.3-8.0 keV, of which 39 of them are associated with the cluster as evidenced by appropriate magnitudes and colors from Two Micron All Sky Survey photometry. We extend the X-ray luminosity distribution (XLD) for M dwarfs, to add to the XLD found for hotter dwarfs from spatially extensive surveys of the whole cluster by ROSAT. Some of the hotter stars are identified as a background, possible slightly older group of stars at a distance of approximately 500 pc.
17676. XMM observations of Cha I dark cloud
ID:
ivo://CDS.VizieR/J/A+A/461/669
Title:
XMM observations of Cha I dark cloud
Short Name:
J/A+A/461/669
Date:
21 Oct 2021
Publisher:
CDS
Description:
Low-mass stars are known to exhibit strong X-ray emission during the early stages of evolution. Nearby star forming regions are ideal targets to study the X-ray properties of pre-main sequence stars. Aims. A deep XMM-Newton exposure is used to investigate X-ray properties of the pre-main sequence population of the Chamaeleon I star forming region. The northern-eastern fringe of the Chameleon I dark cloud was observed with XMM-Newton, revisiting a region observed with ROSAT 15 years ago. Centered on the extended X-ray source CHXR 49 we are able to resolve it into three major contributing components and to analyse their spectral properties. Furthermore, the deep exposure allows not only the detection of numerous, previously unknown X-ray sources, but also the investigation of variability and the study of the X-ray properties for the brighter targets in the field. We use EPIC spectra, to determine X-ray brightness, coronal temperatures and emission measures for these sources, compare the properties of classical and weak-line T Tauri stars and make a comparison with results from the ROSAT observation.
17677. XMM observations of {eta} Cha cluster
ID:
ivo://CDS.VizieR/J/A+A/524/A97
Title:
XMM observations of {eta} Cha cluster
Short Name:
J/A+A/524/A97
Date:
21 Oct 2021
Publisher:
CDS
Description:
The members of the {eta} Chamaleontis cluster are in an evolutionary stage in which disks are rapidly evolving. It also exhibits some peculiarities, such as the large fraction of binaries and accretion disks, probably related to the cluster formation process. Its proximity makes this stellar group an ideal target for studying the relation between X-ray emission and those stellar parameters. Our main objective is to determine the general X-ray properties of the cluster members in terms of coronal temperature, column density, emission measure, X-ray luminosity, and variability. We also aim to establish the relation between the X-ray luminosity of these stars and other stellar parameters, such as effective temperature, binarity, and the presence of accretion disks. Finally, a study of flare energies in each flare event detected during the observations and their relation with some stellar parameters is also performed.
17678. XMM observations of Fornax A (NGC 1316)
ID:
ivo://CDS.VizieR/J/ApJ/645/256
Title:
XMM observations of Fornax A (NGC 1316)
Short Name:
J/ApJ/645/256
Date:
21 Oct 2021
Publisher:
CDS
Description:
An XMM-Newton observation of the east radio lobe of the nearby radio galaxy Fornax A is reported. The diffuse hard X-ray emission associated with the east lobe, which was initially discovered by ASCA and ROSAT, is confirmed with significant signal statistics, after strictly removing 59 sources detected within the MOS field of view. Its X-ray spectrum is described by a single power-law model, which is absorbed by a medium with a column density consistent with that toward the object.
17679. XMM observations of HD 191612 field
ID:
ivo://CDS.VizieR/J/MNRAS/375/145
Title:
XMM observations of HD 191612 field
Short Name:
J/MNRAS/375/145
Date:
21 Oct 2021
Publisher:
CDS
Description:
Using the XMM-Newton observatory, we have observed the peculiar Of?p star HD 191612. The field contains a hundred individual X-ray sources. In this table we present the average X-ray count rates of these sources and their cross-identifications with several catalogues.
17680. 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.

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