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J/ApJ/835/223    A catalog of nearby galaxies with Chandra obs.    (She+, 2017)

Chandra survey of nearby galaxies: the catalog. She R., Ho L.C., Feng H. <Astrophys. J., 835, 223-223 (2017)> =2017ApJ...835..223S (SIMBAD/NED BibCode)
ADC_Keywords: Active gal. nuclei ; X-ray sources ; Velocity dispersion Keywords: galaxies: active; galaxies: nuclei; X-rays: galaxies Abstract: We searched the public archive of the Chandra X-ray Observatory as of 2016 March and assembled a sample of 719 galaxies within 50Mpc with available Advanced CCD Imaging Spectrometer observations. By cross-correlation with the optical or near-infrared nuclei of these galaxies, 314 of them are identified to have an X-ray active galactic nucleus (AGN). The majority of them are low-luminosity AGNs and are unlikely X-ray binaries based upon their spatial distribution and luminosity functions. The AGN fraction is around 60% for elliptical galaxies and early-type spirals, but drops to roughly 20% for Sc and later types, consistent with previous findings in the optical. However, the X-ray survey is more powerful in finding weak AGNs, especially from regions with active star formation that may mask the optical AGN signature. For example, 31% of the H II nuclei are found to harbor an X-ray AGN. For most objects, a single power-law model subject to interstellar absorption is adequate to fit the spectrum, and the typical photon index is found to be around 1.8. For galaxies with a non-detection, their stacked Chandra image shows an X-ray excess with a luminosity of a few times 1037erg/s on average around the nuclear region, possibly composed of faint X-ray binaries. This paper reports on the technique and results of the survey; in-depth analysis and discussion of the results will be reported in forthcoming papers. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 134 719 General information for galaxies in our sample table2.dat 186 719 X-ray properties for galaxies in our sample table4.dat 150 168 Fitting results of galaxies
See also: B/chandra : The Chandra Archive Log (CXC, 1999-2014) VII/141 : Spectrophotometric Atlas of Galaxies (Kennicutt Jr. 1992) VIII/76 : Leiden/Argentine/Bonn (LAB) Survey of Galactic HI (Kalberla+ 2005) VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006) VII/259 : 6dF galaxy survey final redshift release (Jones+, 2009) VII/258 : Quasars and Active Galactic Nuclei (13th Ed.) (Veron+ 2010) J/ApJS/112/315 : Spectroscopic parameters of Seyfert nuclei (Ho+ 1997) J/PASP/111/438 : Updated Zwicky catalog (UZC) (Falco+, 1999) J/ApJ/632/799 : NGC4395 light curves (Peterson+, 2005) J/MNRAS/366/480 : Emission-line properties of Seyfert 2 nuclei (Gu+, 2006) J/ApJS/164/81 : Spectrophotometry of nearby galaxies (Moustakas+, 2006) J/ApJ/670/92 : New sample of low-mass black holes in AGN (Greene+, 2007) J/A+A/495/421 : AGN in XMM-Newton archive (CAIXA) (Bianchi+, 2009) J/MNRAS/398/1165 : AGN in nearby galaxies (Goulding+, 2009) J/ApJS/183/1 : Catalog of central stellar velocity dispersions (Ho+, 2009) J/ApJ/714/25 : AMUSE-Virgo survey. II. (Gallo+, 2010) J/MNRAS/413/971 : Galaxy And Mass Assembly (GAMA) DR1 (Driver+, 2011) J/ApJ/755/167 : Low-mass black holes in SDSS Seyfert 1 gal. (Dong+, 2012) J/ApJ/826/L32 : Black hole masses in megamaser disk galaxies (Greene+, 2016) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Seq Running sequence number 5- 32 A28 --- Name Object Name 34- 39 F6.3 Mpc Dist [0.02/50] Distance from NED 41- 42 I2 h RAh Hour of Right Ascension (J2000) 44- 45 I2 min RAm Minute of Right Ascension (J2000) 47- 51 F5.2 s RAs Second of Right Ascension (J2000) 53 A1 --- DE- Sign of the Declination (J2000) 54- 55 I2 deg DEd Degree of Declination (J2000) 57- 58 I2 arcmin DEm Arcminute of Declination (J2000) 60- 63 F4.1 arcsec DEs Arcsecond of Declination (J2000) 65- 73 A9 --- Class Nuclear spectral classification (1) 75- 90 A16 --- HType Hubble Type from NED 92- 96 F5.1 km/s Sigma [17/414]? Central velocity dispersion (2) 98-101 F4.1 km/s e_Sigma [1/41]? Error in sigma 103-107 F5.2 [10-7W] logLHa [34.9/41.6]? Log of Halpha luminosity (3) 109-111 A3 --- n_logLHa Note(s) on logLHa (4) 113-116 F4.2 [Msun] logMBH [2/10]? Log of Black Hole mass (5) 118-121 F4.2 [Msun] b_logMBH [1/10]? Lower limit of logMBH 123-127 F5.2 [Msun] B_logMBH [3/11]? Upper limit of logMBH 129-134 F6.4 10-22/cm2 NH0 [0.004/0.8] Galactic absorption column density
Note (1): ":" and "::" indicate a classification which is uncertain and highly uncertain, respectively; Ho+ (1997, J/ApJS/112/315). Note (2): There are 419 galaxies in our sample that have published central stellar velocity dispersions σ* and their associated uncertainties: 249 objects from the Palomar survey (Ho+ 2009, J/ApJS/183/1), 163 objects from the HyperLeda database (see Cat. VII/237), and 7 objects from Gu+ (2006, J/MNRAS/366/480). Note (3): From the Palomar survey (Ho+ 1997, J/ApJS/112/315; 2003ApJ...583..159H). Note (4): The typical uncertainties is 10-30%. Letters as follows: b = an uncertainty of 30-50% c = an uncertainty of 100% L = a 3σ lower limit u = a 3σ upper limit Note (5): Estimated using the MBH-σ relation. More details are in the text.
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Seq Sequence running number 6- 33 A28 --- Name Object Name 36- 40 I5 --- ObsID Chandra Observation identifier 43- 48 A6 --- Inst Instrument used in Chandra observation ("ACIS-S", 623 occurrences or "ACIS-I") 51- 55 F5.1 ks Exp [1/190] Exposure of the observation 58- 61 F4.2 arcsec Sep [0.05/2.7]? Offset between X-ray source and galaxy center 64 A1 --- AGN AGN flag: "Y"=yes (314 occurrences) or "N"=No 67- 72 F6.3 --- H0 [-1/1]? Hardness ratio H0: (hard-soft-medium)/full (1) 75- 79 F5.3 --- e_H0 [0.001/0.4]? Error of H0 82- 87 F6.3 --- H1 [-0.7/0.8]? Hardness ratio H1: (medium-soft)/full (1) 90- 94 F5.3 --- e_H1 ? Error of H1 97-102 F6.3 --- H2 [-0.6/1]? Hardness ratio H2: (hard-medium)/full (1) 105-109 F5.3 --- e_H2 ? Error of H2 112-115 F4.2 10+22/cm2 NH [0.3/9.1]? Intrinsic absorption inferred from hardness ratio 118-121 F4.2 10+22/cm2 b_NH [0.01/8]? Lower limit in NH 124-128 F5.2 10+22/cm2 B_NH [0.01/27]? Upper limit in NH 131-138 F8.2 10-17W/m2 Flux [0.08/17100]? Observed flux in 2-10keV 141-148 F8.2 10-17W/m2 b_Flux [0/16800]? Lower limit in Flux 151-158 F8.2 10-17W/m2 B_Flux [0.01/17400]? Upper limit in Flux 161-165 F5.2 [10-7W] logLX [35/44]? Log of 2-10keV luminosity; in erg/s 168-172 F5.2 [10-7W] b_logLX [35/43]? Lower limit in LogLX 175-179 F5.2 [10-7W] B_logLX [30/43]? Upper limit in LogLX 182-186 A5 --- n_logLX Note on luminosity or references for sources suffering from pileup (G1)
Note (1): where soft, medium, hard and full are counts of energy band 0.3-1, 1-2, 2-8 and 0.3-8keV respectively.
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Seq [10/698] Source sequence number 6- 20 A15 --- Name Object Name 23- 34 A12 --- Model Best fit model (1) 37- 41 F5.2 [-] Norm1 [-6.1/-2.3]? Log normalization of power-law component; in photons/keV/cm2/s units 44- 48 F5.2 [10-7W] logL1 [36/43]? Log of 0.3-10keV luminosity of power-law component; in erg/s 51- 55 F5.2 [-] Norm2 [-6.5/-3.7]? Log normalization of 2nd component (2) 58- 62 F5.2 [10-7W] logL2 [36/41]? Log of 0.3-10keV luminosity of 2nd component; in erg/s 65- 70 F6.2 10+22/cm2 NH [0.02/430]? Extragalactic absorption column density 73- 78 F6.2 10+22/cm2 b_NH ? Lower limit in NH 81- 86 F6.2 10+22/cm2 B_NH ? Epper(l)mit in NH 89- 92 F4.2 --- Gamma [0.5/4.3]? Power-law photon index 95- 99 F5.2 --- b_Gamma ? Lower limit in Gamma (3) 102-105 F4.2 --- B_Gamma ? Upper limit in Gamma (3) 108-111 F4.2 keV Temp [0.02/1.1]? Temperature of mekal or blackbody 114-117 F4.2 keV b_Temp ? Lower limit in Temp 120-123 F4.2 keV B_Temp ? Upper limit in Temp 126-130 F5.1 --- Chi2 [0.1/655]? Chi-square 133-135 I3 --- DOF [2/493]? Degree of freedom 138-150 A13 --- Ref Note on spectral fitting or reference for pileup sources (G1)
Note (1): Abbreviations are: PL = powerlaw ME = thermal plasma component (mekal) VME = vmekal PABS = pcfabs BB = cool blackbody component (bbody) G = gaussian (for iron Kα line) component in XSPEC See text for details. Note (2): Normalization of mekal or blackbody component in fitting model, if available. It is equal to (1e-14/4πD2) Integral(nenH dV for a mekal component, where D is the distance to the source, and ne, nH are the electron and hydrogen densities respectively. It is equal to L39/D102 for a blackbody component, where L39 is the source luminosity in units of 10+39erg/s, and D10 is the distance to the source in units of 10kpc. Note (3): In a few cases, the errors are not available due to poor statistics.
Global notes: Note (G1): References and abbreviations as follows: Ref.1 = Ebrero et al. (2011A&A...535A..62E), Ref.2 = De Rosa et al. (2012MNRAS.420.2087D), Ref.3 = Cappi et al. (2006A&A...446..459C), Ref.4 = Shu et al. (2010ApJ...713.1256S), Ref.5 = Iyomoto et al. (1998ApJ...503..168I), Ref.6 = Ptak et al. (2004ApJ...606..173P), Ref.7 = Weaver et al. (1999ApJ...520..130W), Ref.8 = Guainazzi et al. (2010MNRAS.406.2013G), Ref.9 = Evans et al. (2004ApJ...612..786E). Fit = luminosity from spectral fitting HR = luminosity from hardness ratio G1.8 = luminosity from assumption of Γ=1.8 with Galactic NH,0
History: From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 01-Sep-2017
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