J/ApJS/235/32 The 3CR Chandra snapshot survey: 1 =2018ApJS..235...32S (SIMBAD/NED BibCode) ================================================================================ ADC_Keywords: Active gal. nuclei; Radio continuum; X-ray sources; Redshifts Keywords: galaxies: active; radio continuum: galaxies; X-rays: general Abstract: The aim of this paper is to present an analysis of newly acquired X-ray observations of 16 extragalactic radio sources listed in the Third Cambridge Revised (3CR) catalog and not previously observed by Chandra. Observations were performed during Chandra Cycle 17, extending X-ray coverage for the 3CR extragalactic catalog up to z=1.5. Among the 16 targets, two lie at z<0.5 (3CR 27 at z=0.184 and 3CR 69 at z=0.458); all of the remaining 14 have redshifts between 1.0 and 1.5. In the current sample, there are three compact steep spectrum (CSS) sources, three quasars, and an FR I radio galaxy, while the other nine are FR II radio galaxies. All radio sources have an X-ray counterpart. We measured nuclear X-ray fluxes as well as X-ray emission associated with radio jet knots, hotspots, or lobes in three energy bands: soft (0.5-1keV), medium (1-2keV), and hard (2-7keV). We also performed standard X-ray spectral analysis for the four brightest nuclei. We discovered X-ray emission associated with the radio lobe of 3CR 124, a hotspot of the quasar 3CR 220.2, another hotspot of the radio galaxy 3CR 238, and the jet knot of 3CR 297. We also detected extended X-ray emission around the nuclear region of 3CR124 and 3CR297 on scales of several tens of kiloparsecs. Finally, we present an update on the X-ray observations performed with Chandra and XMM-Newton on the entire 3CR extragalactic catalog. Description: We adopted the data reduction and analysis procedures described in previous works, so only basic details are reported here (see, e.g., Massaro+ 2009ApJ...696..980M & 2011, J/ApJS/197/24 for a complete description). We compared radio images, ranging from 1.4 to 14.9GHz, and Chandra observations, searching for a spatial coincidence between X-ray emission and extended radio structures (i.e., jet knots, hotspots, or lobes). Radio images were retrieved from the NVAS (http://data.nrao.edu/portal/) and the DRAGN (http://www.jb.man.ac.uk/atlas/) web pages. Archival VLA data analyzed are from project IDs AE0059 (4.85GHz) and AV0164 (8.4GHz) and were obtained on 1988 October 30 and 1990 May 11, respectively. See Section 2.1. The 3CR source sample observed during Cycle 17 is listed in Table 1. All Chandra observations were performed with the ACIS-S. See Section 2.2. A table summarizing the state of the art of the X-ray (i.e., Chandra and XMM-Newton) observations of 3CR extragalactic sources carried out to date is also reported; see Appendix B (Table 5). File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table1.dat 100 16 Source list of the Chandra Cycle 17 snapshot survey of 3CR radio sources table5.dat 52 298 Summary of the 3CR X-ray observations -------------------------------------------------------------------------------- See also: B/chandra : The Chandra Archive Log (CXC, 1999-2014) B/xmm : XMM-Newton Obs. Log (XMM-Newton Science Operation Center, 2012) VIII/1 : The 3C and 3CR Catalogues (Edge+ 1959-1962) VII/178 : Optical Extragalactic Emission-line Objects (Hewitt+ 1991) VIII/76 : Leiden/Argentine/Bonn (LAB) Survey of Galactic HI (Kalberla+ 2005) J/PASP/97/932 : 3CR Source Identifications (Spinrad+, 1985) J/ApJS/122/81 : HST snapshot survey of 3CR radio sources (Martel+, 1999) J/AJ/130/23 : Spectrophotometry of 3CR lobe-dominated quasars (Aars+, 2005) J/ApJS/164/307 : NICMOS observations of 3CR radio sources (Madrid+, 2006) J/ApJS/177/148 : HST survey of 3CR source counterparts. II. (Floyd+, 2008) J/ApJS/197/24 : Chandra large-scale extragalactic jets. I. (Massaro+, 2011) J/A+A/575/A80 : FIR photometry of 3CR galaxies (Podigachoski+, 2015) J/AJ/151/120 : z<1 3CR radio galaxies & QSOs star formation (Westhues+, 2016) http://data.nrao.edu/portal/ : NRAO archive home page http://www.jb.man.ac.uk/atlas/ : Atlas of DRAGNs home page Byte-by-byte Description of file: table1.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 5 A5 --- Name 3CR name 6 A1 --- n_Name [*] Flag on Name (1) 8- 20 A13 --- Class Classification (2) 22- 23 I2 h RAh Hour of right ascension (J2000) (1) 25- 26 I2 min RAm Minute of right ascension (J2000) 28- 33 F6.3 s RAs Second of right ascension (J2000) 35 A1 --- DE- Sign of declination (J2000) (1) 36- 37 I2 deg DEd Degree of declination (J2000) (1) 39- 40 I2 arcmin DEm Arcminute of declination (J2000) 42- 46 F5.2 arcsec DEs Arcsecond of declination (J2000) 48- 52 F5.3 --- z Redshift from NED unless flagged 53 A1 --- n_z [+o] Flag on z (3) 55- 59 I5 Mpc Dist [900/10970] Distance, D_L_ 61- 65 F5.3 --- Scale [3.113/8.599] Scale: kpc to arcsec 67- 71 F5.2 10+20cm-2 NH [1.2/68.5] Galactic neutral hydrogen column densities N_H,Gal_ (Kalberla+ 2005, VIII/76) 73- 76 F4.1 mag Vmag ? Visual magnitude from NED unless flagged (4) 77 A1 --- n_Vmag [+] +=from Spinrad+ 1985, J/PASP/97/932 79- 82 F4.1 Jy S178 [4.6/26.5] Flux density at 178MHz (Spinrad+ 1985, J/PASP/97/932) 84- 88 I5 --- ObsID [18090/18105] Chandra observation identifier 90- 100 A11 "Y/M/D" Date Date of observation (UT) -------------------------------------------------------------------------------- Note (1): The celestial positions listed are those of the radio cores, which we used to register the X-ray images, except for the four sources lacking an obvious radio nucleus: 3CR 27, 3CR 230, 3CR 297, and 3CR 305.1, labeled with "*" in column n_Name, for which the coordinates are taken from the NASA/IPAC Extragalactic Database (NED). Note (2): The "Class" column contains both a radio morphology descriptor (Fanaroff-Riley class I or II), quasar (QSO), or compact steep spectrum (CSS) and the optical spectroscopic designation LERG, "low-excitation radio galaxy," or HERG, "high-excitation radio galaxy," when present in the literature. Note (3): Flag on redshift as follows: o = sources outside the redshift range 1.0