IC1396NCXO ivo://nasa.heasarc/ic1396ncxo NASA/GSFC HEASARC Getman et al. 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source The IC 1396N cometary globule (CG) within the large nearby HII region IC 1396 has been observed with the Advanced CCD Imaging Spectrometer (ACIS) detector on board the Chandra X-Ray Observatory on 2004 October 16.93 to 17.30. 117 X-ray sources are detected, of which ~ 50-60 are likely members of the young open cluster Trumpler 37 dispersed throughout the HII region, and 25 are associated with young stars formed within the globule. Infrared photometry (2MASS and Spitzer) shows that the X-ray population is very young: 3 older Class III stars, 16 classical T Tauri stars, and 6 protostars including a Class 0/I system. The authors infer a total T Tauri population of ~ 30 stars in the globule, including the undetected population, with a star formation efficiency of 1%-4%. An elongated source spatial distribution with an age gradient oriented toward the exciting star is discovered in the X-ray population of IC 1396N, supporting similar findings in other cometary globules. The geometric and age distribution is consistent with the radiation-driven implosion (RDI) model for triggered star formation in CGs by H II region shocks. The authors include only results arising from the imaging array (ACIS-I) of four abutted 1024 x 1024 pixel front-side illuminated CCDs covering about 17' x 17' on the sky. The aim point of the array was R.A. = 21h40m42.4s, Dec. = +58d1609.7" (J2000.0) or (l,b) = (100.0, + 4.2), and the satellite roll angle (i.e., orientation of the CCD array relative to the north-south direction) was 245.9 degrees. The total net exposure time of the observation is 30 ks with no background flaring due to solar activity or data losses. This table was created by the HEASARC in February 2009 based on the electronic version of Tables 1 and 2 from the paper which were obtained from the CDS (their catalog J/ApJ/654/316 files table1.dat and table2.dat). This is a service provided by NASA HEASARC . 2007ApJ...654..316G https://heasarc.gsfc.nasa.gov/W3Browse/all/ic1396ncxo.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=ic1396ncxo& GET text/xml 180 99999 true 325.235256 58.101172 0.0166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=ic1396ncxo GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_ic1396ncxo&Action=More+Options&Action=Parameter+Search&ConeAdd=1 CHANDRA 0.0166666666666667 X-ray public ic1396ncxo IC 1396N Chandra X-Ray Point Source Catalog name IAU-Style 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 fb_counts Estimated Net Full-Band Counts from Extracted Area in Energy Band 0.5-8.0keV ct phot;em.X-ray double nullable fb_counts_error RMS Uncertainty on Estimated Net Full-Band Counts ct stat.error;phot;em.X-ray double nullable significance Source Significance stat.likelihood;em.X-ray double nullable ks_mag 2MASS Ks Magnitude mag phot.mag;em.IR.K double nullable irac_4p5_um_mag_error RMS Uncertainty for Spitzer 4.5um Magnitude mag stat.error;phot.mag;em.IR.4-8um double nullable irac_5p8_um_mag_limit Limit Flag for Spitzer 5.8um Magnitude meta.code;phot.mag;em.IR.4-8um char nullable median_energy Background-Corrected Median Photon Energy in Total (0.5-8keV) Energy Band (keV) keV phys.energy double nullable source_flag Flag [abc] Indicates Note Concerning Source meta.code char nullable class Browse Object Classification src.class short nullable exposure Source Effective Exposure (s) s time.duration;obs.exposure double nullable hb_counts Estimated Net Counts from Extracted Area in Hard Energy Band 2-8keV ct phot;em.X-ray.medium double nullable cxo_spitzer_offset Chandra-Spitzer Positional Offset (arcsec) arcsec pos.angDistance;em.X-ray;em.IR double nullable lii Galactic Longitude degree pos.galactic.lon double nullable var_flag Flag [abc] Indicates Variability Characterization Based on K-S Statistics meta.code;src.var char nullable irac_5p8_um_mag Spitzer 5.8um Magnitude mag phot.mag;em.IR.4-8um double nullable twomass_conf_flags Flags Indicate 2MASS Confusion-Contamination meta.code;src char nullable bii Galactic Latitude degree pos.galactic.lat double nullable psf_fraction Fraction of PSF at Fiducial Energy of 1.49-7keV Enclosed within Extracted Area instr.det.psf double nullable cxo_2mass_offset Chandra-2MASS Positional Offset (arcsec) arcsec pos.angDistance;em.X-ray;em.IR double nullable nisini_kmag K-Band Magnitude from Nisini et al. (2001A&A...376..553N) mag phot.mag;em.IR.K double nullable source_anomaly_flag Flag [geps] Indicates Source Anomalies meta.code char nullable irac_3p6_um_mag_error RMS Uncertainty for Spitzer 3.6um Magnitude mag stat.error;phot.mag;em.IR.3-4um double nullable irac_4p5_um_mag Spitzer 4.5um Magnitude mag phot.mag;em.IR.4-8um double nullable nisini_number NIR Identifier from Nisini et al. (2001A&A...376..553N), [NMV2001] YSO NN meta.id.cross short nullable hmag_limit Limit Flag for H Magnitude meta.code;phot.mag;em.IR.H char nullable off_axis Off-axis Angle (arcmin) arcmin instr.offset double nullable alt_name Alternative Catalog-Based Source Designation meta.id char nullable twomass_name 2MASS Counterpart (2MASS JHHMMSSss+DDMMSSs) meta.id.cross char nullable bck_counts Estimated Background Counts from Extracted Area in Total Energy Band ct phot;instr.background;em.X-ray double nullable jmag_limit Limit Flag for J Magnitude meta.code;phot.mag;em.IR.J char nullable twomass_photo_flags 2MASS Photometry Quality meta.code;phot char nullable hmag 2MASS H Magnitude mag phot.mag;em.IR.H double nullable pre_ms_type Suggested PMS Class Based on Presence of NIR Counterpart and NIR-MIR Diagrams src.class char nullable irac_3p6_um_mag Spitzer 3.6um Magnitude mag phot.mag;em.IR.3-4um double nullable source_number Sequential Identification Number for Each Source in Catalog meta.id;src short nullable jmag 2MASS J Magnitude mag phot.mag;em.IR.J double nullable irac_5p8_um_mag_error RMS Uncertainty for Spitzer 5.8um Magnitude mag stat.error;phot.mag;em.IR.4-8um 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