IC 348 Chandra X-Ray Point Source Catalog 2

IC 348 Chandra X-Ray Point Source Catalog 2 IC348CXO2 ivo://nasa.heasarc/ic348cxo2 NASA/GSFC HEASARC Stelzer et al. 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source IC 348 is a nearby (~ 310 pc), young (~ 2 - 3 Myr) open cluster with > 300 members identified from optical and infrared observations. The authors studied the properties of the coronae of the young low-mass stars in IC 348, combining X-ray and optical/infrared data. The four existing Chandra observations of IC 348 were merged, thus providing a deeper and spatially more complete X-ray view than previous X-ray studies of the cluster. The authors compiled a comprehensive catalog of IC 348 members taking into account recent updates to the cluster census. Their data collection comprises fundamental stellar parameters, infrared excess indicating the presence of disks, H-alpha emission as a tracer of chromospheric emission or accretion, and mass accretion rates. The authors have detected 290 X-ray sources in four merged Chandra exposures, of which 185 are associated with known cluster members corresponding to a detection rate of ~ 60% for the cluster members of IC 348 identified in optical/infrared studies. According to the most recent spectral classification of IC 348 members, only four of the X-ray sources are brown dwarfs (spectral type M6 and later). The detection rate is highest for diskless Class III stars and increases with stellar mass. This may be explained with higher X-ray luminosities for higher mass and later evolutionary stage that is evident in the X-ray luminosity functions. In particular, the authors find that for the lowest examined masses (0.1 Msun - 0.25 Msun) there is a difference between the X-ray luminosity functions of accreting and non-accreting stars (classified on the basis of their H-alpha emission strength) as well as those of disk-bearing and diskless stars (classified on the basis of the slope of the spectral energy distribution). These differences disappear for higher masses. This is related to the finding that the Lx/Lbol ratio is non-constant across the mass/luminosity sequence of IC 348 with a decrease towards lower luminosity stars. Their analysis of an analogous stellar sample in the Orion Nebula Cluster suggests to the authors that the decline of Lx/Lbol for young stars at the low-mass end of the stellar sequence is likely universal. X-ray fluxes are presented for all (185) known optical/infrared IC348 members which were observed and detected by Chandra. The basic source parameters for all X-ray sources, i.e., including an additional 105 sources not associated with known IC 348 members, are given. The X-ray flux upper limits for 129 IC 348 members which were observed but not detected by Chandra (present in the as published version of Table 3 from the reference paper) are not included in this HEASARC representation of the data given in Tables 3 and 7 from the reference paper. Thus, this table contains 290 (185 + 105) rows, one for each X-ray source (IC 348 member or not) detected by Chandra in the direction of IC 348. This HEASARC table was created in February 2012 based on <a href="https://cdsarc.cds.unistra.fr/ftp/cats/J/A+A/537/A135">CDS Catalog J/A+A/537/A135</a> files table3.dat and table7.dat. It lists the X-ray counts and other properties for the 290 Chandra X-ray sources which were listed in table7.dat. It does not include the X-ray flux upper limits for 129 non-detected IC 348 members which were given in table3.dat, so only the X-ray fluxes and luminosities for the 185 X-ray detected IC 348 members given in table3.dat are included in this table. Notice that in the CDS version there were 2 duplicate entries in table3.dat. Some of the values for the name parameter in the HEASARC's implementation of this table were corrected in April 2018. This is a service provided by NASA HEASARC . 2012A&A...537A.135S https://heasarc.gsfc.nasa.gov/W3Browse/all/ic348cxo2.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=ic348cxo2& GET text/xml 180 99999 true 55.925209 31.873606 0.0166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=ic348cxo2 GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_ic348cxo2&Action=More+Options&Action=Parameter+Search&ConeAdd=1 CHANDRA 0.0166666666666667 X-ray public ic348cxo2 IC 348 Chandra X-Ray Point Source Catalog 2 name Chandra Source Designation, CXOU JHHMMSS.s+DDMMSS meta.id;meta.main char nullable ra Right Ascension degree pos.eq.ra;meta.main double nullable dec Declination degree pos.eq.dec;meta.main double nullable error_radius Standard Deviation of Position Error arcsec stat.error;pos double nullable off_axis Off-Axis Angle arcmin instr.offset double nullable counts Net Counts Extracted in the Total Energy Band (0.5-8.0keV) phot;em.X-ray double nullable counts_error 1-Sigma Uncertainty for the Net Counts Extracted in the Total Energy Band stat.error;phot;em.X-ray double nullable flux X-Ray Flux erg/s/cm^2 phot.flux;em.X-ray double nullable log_lx Logarithm of the X-Ray Luminosity log(erg/s) phys.luminosity;em.X-ray double nullable bii Galactic Latitude degree pos.galactic.lat double nullable median_energy Background-Corrected Median Photon Energy in the Total 0.5-8keV Energy Band keV phys.energy double nullable log_bck_prob_limit Limit Flag for the Background Probability (Total Band) meta.code;stat.probability char nullable log_bck_prob Logarithm of the Probability That Counts (Total Band) Are Solely from Background stat.probability double nullable source_anomaly_flag Flag [g] Indicates Source Anomalies meta.code char nullable source_variable_flag Flag [abc] Indicates Source Variability meta.code;src.var char nullable bck_counts Background Counts Expected in the Source Extraction Region (Total Band) phot;instr.background;em.X-ray double nullable flux_flag Flag Indicates Note Concerning Source meta.code;phot.flux;em.X-ray char nullable cluster_number Cluster Identifier, Cl* IC 348 LRL NNNNN in Simbad meta.id.assoc int nullable exposure Source Effective Exposure Time s time.duration;obs.exposure double nullable lii Galactic Longitude degree pos.galactic.lon double nullable snr Source Significance stat.snr double nullable source_number Sequential Identification Number for Each Source in Catalog meta.id;src short nullable psf_fraction Fraction of PSF Enclosed in Extraction Region (at 1.497keV) instr.det.psf double nullable hb_counts Net Counts Extracted in the Hard Energy Band (2.0-8.0keV) phot;em.X-ray.medium double nullable "__x_ra_dec" System unit vector column double nullable "__y_ra_dec" System unit vector column double nullable "__z_ra_dec" System unit vector column double nullable "__row" System index column char nullable