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J/ApJ/681/1163      Late-type galaxies in Chandra deep fields    (Lehmer+, 2008)

Tracing the mass-dependent star formation history of late-type galaxies using X-ray emission: results from the Chandra deep fields. Lehmer B.D., Brandt W.N., Alexander D.M., Bell E.F., Hornschemeier A.E., McIntosh D.H., Bauer F.E., Gilli R., Mainieri V., Schneider D.P., Silverman J.D., Steffen A.T., Tozzi P., Wolf C. <Astrophys. J., 681, 1163-1182 (2008)> =2008ApJ...681.1163L
ADC_Keywords: Active gal. nuclei ; X-ray sources ; Redshifts ; Photometry, HST Keywords: cosmology: observations - galaxies: active - galaxies: general - galaxies: spiral - stars: formation - surveys - X-rays: galaxies - X-rays: general Abstract: We report on the X-ray evolution over the last ∼9Gyr of cosmic history (i.e., since z=1.4) of late-type galaxy populations in the Chandra Deep Field-North and Extended Chandra Deep Field-South (CDF-N and E-CDF-S, respectively; jointly CDFs) survey fields. Our late-type galaxy sample consists of 2568 galaxies, which were identified using rest-frame optical colors and HST morphologies. We utilized X-ray stacking analyses to investigate the X-ray emission from these galaxies, emphasizing the contributions from normal galaxies that are not dominated by active galactic nuclei (AGNs). Over this redshift range, we find significant increases (factors of ∼5-10) in the X-ray-to-optical mean luminosity ratio (LX/LB) and the X-ray-to-stellar mass mean ratio (LX/M*) for galaxy populations selected by LB and M*, respectively. When analyzing galaxy samples selected via SFR, we find that the mean X-ray-to-SFR ratio (LX/SFR) is consistent with being constant over the entire redshift range for galaxies with SFR=1-100M/yr, thus demonstrating that X-ray emission can be used as a robust indicator of star formation activity out to z∼1.4. We find that the star formation activity (as traced by X-ray luminosity) per unit stellar mass in a given redshift bin increases with decreasing stellar mass over the redshift range z=0.2-1, which is consistent with previous studies of how star formation activity depends on stellar mass. Finally, we extend our X-ray analyses to Lyman break galaxies at z∼3 and estimate that LX/LB at z∼3 is similar to its value at z=1.4. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 139 225 X-ray detected late-type galaxies: source properties table2.dat 182 44 Stacked late-type normal galaxies: mean properties
See also: B/chandra : The Chandra Archive Log (CXC, 1999-) II/253 : Chandra Deep Field South: multi-colour data (Wolf+, 2008) II/261 : GOODS initial results (Giavalisco+, 2004) J/A+A/465/1099 : Redshift catalog of 691 objects in CDFS (Ravikumar+, 2007) J/ApJ/660/167 : Spitzer AGN candidates in CDFN (Donley+, 2007) J/A+A/454/423 : GOODS-South Field VLT/FORS2 redshifts. II. (Vanzella+, 2006) J/A+A/449/951 : GOODS-MUSIC sample: multicolour catalog (Grazian+, 2006) J/AJ/131/2373 : Extended Chandra Deep Field-South survey (Virani+, 2006) J/A+A/451/457 : X-ray properties of AGN in CDFS (Tozzi+, 2006) J/ApJS/161/21 : Extended Chandra Deep Field-South survey (Lehmer+, 2005) J/A+A/437/883 : K20 survey: spectroscopic catalogue (Mignoli+, 2005) J/A+A/434/53 : GOODS-South Field redshifts (Vanzella+, 2005) J/ApJS/155/271 : Chandra Deep Field-South: Optical spectroscopy (Szokoly+, 2004) J/AJ/127/3121 : TKRS catalog of GOODS-North Field (Wirth+, 2004) J/AJ/126/539 : The Chandra Deep Fields North and South (Alexander+, 2003) J/AJ/126/632 : UBVRIz'HK' photometry of 2Ms CDFN X-ray sources (Barger+, 2003) J/A+A/428/1043 : Redshifts from VIMOS VLT Deep Survey (Le Fevre+, 2004) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 3 A3 --- --- [CXO] 4- 22 A19 --- CXO Chandra source name ( (1) 24- 28 F5.2 mag zmag HST/ACS F850LP (z850 band) magnitude 30- 33 F4.2 --- z Redshift estimated from litterature 34 A1 --- f_z [SP] Redshift: Spectroscopic or Photometric 36- 40 F5.2 [Lsun] logB Log of B band luminosity 42- 46 F5.2 [Msun] logM Log of stellar mass 48 A1 --- l_SFR Limit flag on SFR 49- 54 F6.2 Msun/yr SFR Star-Formation Rate 56- 63 A8 --- Field Chandra detection field (2) 65- 68 I4 ks Exp Full band (0.5-8keV) effective exposure time 70 A1 --- l_logFF Limit flag on logFF 71- 76 F6.2 [mW/m2] logFF Log of Full band (0.5-8keV) flux 78 A1 --- l_logSF Limit flag on logSF 79- 84 F6.2 [mW/m2] logSF Log of Soft band (0.5-2keV) flux 86 A1 --- l_logHF Limit flag on logHF 87- 92 F6.2 [mW/m2] logHF Log of Hard band (2-8keV) flux 94 A1 --- l_logFL Limit flag on logFL 95- 99 F5.2 [10-7W] logFL Log of Full band (0.5-8keV) luminosity 101 A1 --- l_logSL Limit flag on logSL 102-106 F5.2 [10-7W] logSL Log of Soft band (0.5-2keV) luminosity 108 A1 --- l_logHL Limit flag on logHL 109-113 F5.2 [10-7W] logHL Log of Hard band (2-8keV) luminosity 115 A1 --- f_Gamma Limit or approximate flag on Gamma 116-120 F5.2 --- Gamma Effective photon index Γ 122 A1 --- l_logR Limit flag on log R 123-127 F5.2 [-] logR Log of 0.5-8keV to R band flux ratio 129 A1 --- AGN? [YN] AGN candidate? 131-139 A9 --- n_AGN? AGN criterion (3)
Note (1): Sources are <CXOU JHHMMSS.s+DDMMSS> in Simbad. Note (2): For E-CDF-S identifications, the associated field number (1 to 4) indicates the Chandra pointing within which the source was detected (see Lehmer et al., 2005, Cat. J/ApJS/161/21 for details). Note (3): AGN candidates identified according criteria as follows: 1 = X-ray hardness to identify luminous obscured source; 2 = X-ray-to-optical flux ratio; 3 = X-ray-to-SFR correlation; 4 = Infrared and Radio properties; 5 = Optical spectroscopy. See section 4.1 for further details.
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 16 A16 --- Type Physical property used to select stacked sample (logLB, logM* or SFR) 18- 21 F4.2 --- z Mean redshift 23- 25 I3 --- Ngal Number of stacked galaxies 27- 28 I2 --- Nx Number of X-ray detected normal stacked galaxies 30- 34 F5.1 ct Fnet Net 0.5-8keV band source counts 36- 40 F5.1 ct Snet Net 0.5-2keV band source counts 42- 46 F5.1 ct Hnet Net 2-8keV band source counts 48- 51 F4.1 --- FS/N The 0.5-8keV band signal-to-noise 53- 56 F4.1 --- SS/N The 0.5-2keV band signal-to-noise 58- 60 F3.1 --- HS/N The 2-8keV band signal-to-noise 62- 67 F6.2 [mW/m2] logFF Log of mean 0.5-8keV band flux 69- 74 F6.2 [mW/m2] logSF Log of mean 0.5-2keV band flux 76 A1 --- l_logHF Limit flag on logHF 77- 82 F6.2 [mW/m2] logHF Log of mean 2-8keV band flux 84 A1 --- l_Fgal Limit flag on Fgal 85- 88 F4.2 --- Fgal Fraction of mean 0.5-8keV band flux from X-ray undetected galaxies 90 A1 --- l_Sgal Limit flag on Sgal 91- 94 F4.2 --- Sgal Fraction of mean 0.5-2keV band flux from X-ray undetected galaxies 96 A1 --- l_Hgal Limit flag on Hgal 97-100 F4.2 --- Hgal ? Fraction of mean 2-8keV band flux from X-ray undetected galaxies 102-106 F5.2 [10-7W] logFL Log of mean 0.5-8keV band rest-frame luminosity 108-112 F5.2 [10-7W] logSL Log of mean 0.5-2keV band rest-frame luminosity 114 A1 --- l_logHL Limit flag on logHL 115-119 F5.2 [10-7W] logHL Log of mean 2-8keV band rest-frame luminosity 121 A1 --- l_Gamma Limit on Gamma 122-125 F4.2 --- Gamma Mean effective photon index Γ 127-131 F5.2 [-] logR Log of mean 0.5-8keV to R band flux ratio 133-137 F5.2 [Lsun] logB ? Log of mean B band luminosity 139-143 F5.2 [Msun] logM ? Log of mean stellar mass 145-148 F4.2 [Msun/yr] logSFR ? Log of mean star formation rate 150-154 F5.2 [10-7W/Lsun] logXB ? Log of mean X-ray to B band luminosity ratio 156-160 F5.2 [10-7W/Msun] logXM ? Log of mean X-ray luminosity to stellar mass ratio 162-166 F5.2 [10-7W/Msun/yr] logXSFR ? Log of mean X-ray luminosity to star formation rate ratio 168-171 F4.2 --- Fagn Estimated Fraction of 0.5-8keV luminosity attributed to AGNs 173-176 F4.2 --- Sagn Estimated Fraction of 0.5-2keV luminosity attributed to AGNs 178 A1 --- l_Hagn Limit flag on Hagn 179-182 F4.2 --- Hagn Estimated Fraction of 2-8keV luminosity attributed to AGNs
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 28-Oct-2010
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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