J/ApJS/194/2 Chandra Carina Complex Project (CCCP) catalog (Broos+, 2011)
A catalog of Chandra X-ray sources in the Carina nebula.
Broos P.S., Townsley L.K., Feigelson E.D., Getman K.V., Garmire G.P.,
Preibisch T., Smith N., Babler B.L., Hodgkin S., Indebetouw R., Irwin M.,
King R.R., Lewis J., Majewski S.R., McCaughrean M.J., Meade M.R.,
Zinnecker H.
<Astrophys. J. Suppl. Ser., 194, 2 (2011)>
=2011ApJS..194....2B 2011ApJS..194....2B
ADC_Keywords: X-ray sources ; Nebulae ; Clusters, open ; Cross identifications ;
Infrared sources ; YSOs
Keywords: ISM: individual objects (Carina Nebula) - open clusters and
associations: individual (Tr14, Tr15, Tr16) - stars: formation -
stars: pre-main sequence - X-rays: stars
Abstract:
We present a catalog of ∼14000 X-ray sources observed by the ACIS
instrument on the Chandra X-ray Observatory within a 1.42deg2 survey
of the Great Nebula in Carina, known as the Chandra Carina Complex
Project (CCCP). This study appears in a special issue devoted to the
CCCP. Here, we describe the data reduction and analysis procedures
performed on the X-ray observations, including calibration and
cleaning of the X-ray event data, point-source detection, and source
extraction. The catalog appears to be complete across most of the
field to an absorption-corrected total-band luminosity of
∼1030.7erg/s for a typical low-mass pre-main-sequence star.
Counterparts to the X-ray sources are identified in a variety of
visual, near-infrared, and mid-infrared surveys. The X-ray and
infrared source properties presented here form the basis of many CCCP
studies of the young stellar populations in Carina.
Description:
The Chandra Carina Complex Project (CCCP) is a 1.42deg2 survey, at
an assumed distance of 2.3kpc, of the Great Nebula in Carina with the
Imaging array of the Advanced CCD Imaging Spectrometer (ACIS-I) on the
Chandra X-ray Observatory, and is described in Townsley et al.
(2011ApJS..194....1T 2011ApJS..194....1T). The Very Large Project (VLP) data were acquired
over nine months, from 2008 February 12 through 2008 October 15 and
were completed with Chandra archive ObsID 6402 (Trumpler 16, in 2006
Aug 30), ObsID 4495 (Trumpler 14, in 2004 Sep 21), and ObsID 6578
(Treasure Chest Cluster, in 2006 Apr 16).
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 429 14369 CCCP X-ray sources and properties
table3.dat 123 39 CCCP sources with >500 net counts in I-array
extractions
table6.dat 681 14369 Counterpart properties
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See also:
J/ApJS/194/4 : Classification of CCCP X-ray sources (Broos+, 2011)
B/chandra : The Chandra Archive Log (CXC, 1999-)
B/mk : Catalogue of Stellar Spectral Classifications (Skiff, 2010)
I/317 : The PPMXL Catalog (Roeser+ 2010)
I/280 : All-sky Compiled Catalogue of 2.5 million stars (Kharchenko+ 2009)
I/315 : UCAC3 Catalogue (Zacharias+ 2009)
I/294 : The UCAC2 Bright Star Supplement (Urban+, 2006)
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
J/ApJS/194/7 : X-ray properties of O and B stars in Carina (Naze+, 2011)
J/ApJS/194/6 : Candidate X-ray emitting OB stars (Povich et al., 2011)
J/ApJS/194/5 : Carina OB stars in the CCCP (Gagne+, 2011)
J/A+A/515/A26 : H and Ks photometry of Trumpler 14 (Sana+, 2010)
J/A+A/490/1055 : Tr 16 low-mass stars Chandra survey (Albacete-Colombo+, 2008)
J/A+A/476/199 : Trumpler 14 JHKL' photometry (Ascenso+, 2007)
J/A+A/467/1397 : PMS stars in open clusters: DAY-I Catalogue (Delgado+, 2007)
J/ApJ/667/963 : Near-infrared photometry of Carina nebula (Sanchawala+, 2007)
J/A+A/423/579 : Diffuse emissions in Carina nebula (Mizutani+, 2004)
J/A+A/379/136 : UBVRI photometry of 3 young open clusters (Carraro+, 2001)
J/ApJ/549/578 : BV photometry of Trumpler 14 and 16 (Degioia-Eastwood+, 2001)
J/AJ/105/980 : Stellar content of Tr 14 and Tr 16 (Massey+ 1993)
J/AJ/105/1822 : Open clusters near eta Car (Cudworth+ 1993)
J/AJ/105/258 : UBVRI polarimetry in Car Nebula (Marraco+ 1993)
http://www2.astro.psu.edu/xray/acis/acis_analysis.html : Tools for ACIS data
analysis online, described by Broos et al. 2010ApJ...714.1582B 2010ApJ...714.1582B
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 I5 --- CCCP Sequence number (<[BTF2011] CCCP NNNNN> in
Simbad) (G1)
7- 24 A18 --- CXOGNC IAU source name; CXOGNC J(HHMMSS.ss+DDMMSS.s)
26- 35 A10 --- Label CCCP project source name (G2)
37- 46 F10.6 deg RAdeg Right Ascension in decimal degrees (J2000)
48- 57 F10.6 deg DEdeg Declination in decimal degrees (J2000)
59- 67 E9.2 arcsec ePos ?=-9.99E-99 1σ error circle around RA,DE
69- 85 A17 --- PosType Algorithm used to estimate position
87- 95 E9.2 --- noSrc-m Smallest of noSrc-t, noSrc-s, & noSrc-h (1)
97-104 E8.2 --- noSrc-t p-value for 0.5-8keV no-source hypothesis (1)
106-114 E9.2 --- noSrc-s p-value for 0.5-2keV no-source hypothesis (1)
116-124 E9.2 --- noSrc-h p-value for 2-8keV no-source hypothesis
126 A1 --- SFlag [1] Suspicious flag if coincident with PSF
feature
128-136 E9.2 --- KS-s Smallest p-value for one-sample
Kolmogorov-Smirnov statistic (2)
138-146 E9.2 --- KS-m Smallest p-value for one-sample
Kolmogorov-Smirnov statistic (3)
148-156 F9.2 s ExpNom Total exposure time in merged observations
158-161 F4.2 --- ExpFrac Fraction of ExpNom source was observed (4)
163 I1 --- Nobs Total number of observations extracted
165-166 I2 --- Nph ?=-9 Number of observations merged (5)
167-173 A7 --- --- [.09E±]
175-183 E9.2 --- fdis Fraction of exposure discarded in merge
185-188 F4.1 arcmin theta-m Smallest value of θ
190-193 F4.1 arcmin theta Average off-axis angle θ i
for merged observations
195-199 F5.2 arcmin theta-M Largest value of θ
201-205 F5.2 --- PSFfrac Average PSF fraction at 1.5keV for merged
observations
207-215 E9.2 --- SrcArea ?=-9.99E-99 Average aperture area for merged
observations (6)
217-225 E9.2 --- aglow ?=-9.99E-99 Suspected afterglow fraction (7)
227-231 I5 ct Oct-t Observed 0.5-8keV counts in merged apertures
233-237 I5 ct Oct-s Observed 0.5-2keV counts in merged apertures
239-242 I4 ct Oct-h Observed 2-8keV counts in merged apertures
244-251 E8.2 --- bgScl Scaling of background extraction
253-256 I4 ct bgct-t Background region observed 0.5-8keV counts
258-261 I4 ct bgct-s Background region observed 0.5-2keV counts
263-267 F5.1 ct bgct-h Background region observed 2-8keV counts
269-275 F7.1 ct Nct-t Net 0.5-8keV counts in merged apertures
277-283 F7.1 ct Nct-s Net 0.5-2keV counts in merged apertures
285-290 F6.1 ct Nct-h Net 2-8keV counts in merged apertures
292-296 F5.1 cm2.ct/ph Area-t Mean 0.5-8keV ARF value (8)
298-302 F5.1 cm2.ct/ph Area-s Mean 0.5-2keV ARF value (8)
304-309 F6.2 cm2.ct/ph Area-h Mean 2-8keV ARF value (8)
311-319 E9.2 keV E-t Median 0.5-8keV energy; observed spectrum (9)
321-329 E9.2 keV E-s Median 0.5-2keV energy; observed spectrum (9)
331-339 E9.2 keV E-h Median 2-8keV energy; observed spectrum (9)
341-349 E9.3 mW/m2 Flux-t The 0.5-8keV energy flux; erg/s/cm2
351-359 E9.3 mW/m2 Flux-s The 0.5-2keV energy flux; erg/s/cm2
361-369 E9.3 mW/m2 Flux-h The 2-8 keV energy flux; erg/s/cm2
371-379 E9.3 ct Nct-tm ?=-9.99E-99 1σ lower bound on Nct-t (10)
381-389 E9.3 ct Nct-tM ?=-9.99E-99 1σ upper bound on Nct-t (10)
391-399 E9.3 ct Nct-sm ?=-9.99E-99 1σ lower bound on Nct-s (10)
401-409 E9.3 ct Nct-sM ?=-9.99E-99 1σ upper bound on Nct-s (10)
411-419 E9.3 ct Nct-hm ?=-9.99E-99 1σ lower bound on Nct-h (10)
421-429 E9.3 ct Nct-hM ?=-9.99E-99 1σ upper bound on Nct-h (10)
--------------------------------------------------------------------------------
Note (1): In statistical hypothesis testing, the p-value is the probability
of obtaining a test statistic at least as extreme as the one that was
actually observed when the null hypothesis is true. Source
significance quantities are computed using a subset of each source's
extractions chosen to maximize significance (Broos et al.
2010ApJ...714.1582B 2010ApJ...714.1582B, Section 6.2).
Source position quantities (RAdeg, DEdeg, e_Pos) are computed using
a subset of each source's extractions chosen to minimize the position
uncertainty (Broos et al. 2010ApJ...714.1582B 2010ApJ...714.1582B, Section 6.2 and 7.1).
All other quantities are computed using a subset of each source's
extractions chosen to balance the conflicting goals of minimizing
photometric uncertainty and of avoiding photometric bias (Broos et al.
2010ApJ...714.1582B 2010ApJ...714.1582B, Section 6.2 and 7).
Note (2): Under the no-variability null hypothesis within a
single-observation. See Broos et al. 2010ApJ...714.1582B 2010ApJ...714.1582B, Section 7.6
for a description of the variability metrics, and caveats regarding
possible spurious indications of variability using the ProbKS merge
metric.
Note (3): Under the no-variability null hypothesis over merged
observations. See Broos et al. 2010ApJ...714.1582B 2010ApJ...714.1582B, Section 7.6 for a
description of the variability metrics, and caveats regarding possible
spurious indications of variability using the ProbKS merge metric.
Note (4): Due to dithering over inactive portions of the focal plane, a
Chandra source is often not observed during some fraction of the
nominal exposure time. (See
http://cxc.harvard.edu/ciao/why/dither.html.) The reported quantity is
FRACEXPO produced by the CIAO tool mkarf.
Note (5): To estimate photometry properties.
Note (6): In units of (0.492arcsec)2.
Note (7): Since the extracted event data are lightly-cleaned to avoid
removing legitimate X-ray events from bright sources (Broos et al.
2010ApJ...714.1582B 2010ApJ...714.1582B, Section 3), some background events arising from
an effect known as "afterglow"
(http://cxc.harvard.edu/ciao/why/afterglow.html) will remain. We
attempt to identify afterglow events using the tool
aeafterglowreport (see the AE manual), and report the fraction of
extracted events attributed to afterglow.
Note (8): In units of cm2.counts/photon. The ancillary response file
(ARF) in ACIS data analysis represent both the effective area of the
observatory and the fraction of the observation for which data were
actually collected for the source (ExpFrac).
Note (9): The AE quantity ENERGPCT50OBSERVED, the median energy of
extracted events, corrected for background (Broos et al.
2010ApJ...714.1582B 2010ApJ...714.1582B, Section 7.3).
Note (10): Confidence intervals (68%) for NetCounts quantities are
estimated by the CIAO tool aprates
(http://asc.harvard.edu/ciao/ahelp/aprates.html).
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 18 A18 --- CXOGNC IAU source name (HHMMSS.ss+DDMMSS.s, J2000)
20- 29 A10 --- Label CCCP project source name (G2)
31- 35 I5 ct Ncts X-ray net counts in the total 0.5-8keV band
37- 58 A22 --- OName Other designation(s)
60- 84 A25 --- SpType MK spectral type
86-103 A18 --- Aut Author's CCCP reference
105-123 A19 --- BibCode Bibcode reference
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table6.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 I5 --- CCCP Sequence number (<[BTF2011] CCCP NNNNN> in
Simbad) (G1)
7- 24 A18 --- CXOGNC IAU source name (HHMMSS.ss+DDMMSS.s, J2000)
26- 35 A10 --- Label CCCP project source name (G2)
37- 40 F4.1 arcsec r(S09) ?=-9.9 Offset of Skiff 2009, Cat. B/mk, source
42- 45 F4.1 arcsec r(K09) ?=-9.9 Offset of Kharchenko 2009, Cat. I/280,
source
47- 50 F4.1 arcsec r(PPMXL) ?=-9.9 Offset of PPMXL, Cat. I/317, source
52- 55 F4.1 arcsec r(UCAC3) ?=-9.9 Offset of UCAC3, Cat. I/315, source
57- 60 F4.1 arcsec r(BSS) ?=-9.9 Offset of UCAC BSS, Cat.I/294, source
62- 65 F4.1 arcsec r(C93) ?=-9.9 Offset of Cudworth source, 1993,
Cat. J/AJ/105/1822 (<Cl* Trumpler 14 Y NNN>)
67- 70 F4.1 arcsec r(D01) ?=-9.9 Offset of Degioia source, 2001,
Cat. J/ApJ/549/578,
( in Simbad)
72- 75 F4.1 arcsec r(M01) ?=-9.9 Offset of Massey source,
2001AJ....121.1050M 2001AJ....121.1050M
77- 80 F4.1 arcsec r(M93) ?=-9.9 Offset of Massey source, 1993,
Cat. J/AJ/105/980 (<Cl* Trumpler 1[46] MJ NNN>)
82- 85 F4.1 arcsec r(C01) ?=-9.9 Offset of Carraro source, 2001,
Cat. J/A+A/379/136
87- 90 F4.1 arcsec r(D07) ?=-9.9 Offset of Delgado source, 2007,
Cat. J/A+A/467/1397 (< DAY-I CHHMM+DDd-NNNNN>)
92- 95 F4.1 arcsec r(HI) ?=-9.9 Offset of HAWK-I catalog (Preibisch et
al., 2011ApJS..194...10P 2011ApJS..194...10P) source
97-100 F4.1 arcsec r(2M) ?=-9.9 Offset of 2MASS, Cat. II/246, source
102-105 F4.1 arcsec r(SOFI) ?=-9.9 Offset of SOFI catalog (Ascenso et al.
2007, Cat. J/A+A/476/199) source
107-110 F4.1 arcsec r(NACO) ?=-9.9 Offset of NACO catalog (Ascenso et al.
2007, Cat. J/A+A/476/199) source
112-115 F4.1 arcsec r(S10) ?=-9.9 Offset of Sana 2010, Cat. J/A+A/515/A26,
source
117-120 F4.1 arcsec r(SpV) ?=-9.9 Offset of Spitzer Vela catalog (Povich et
al., 2011, Cat. J/ApJS/194/14) source
122-125 F4.1 arcsec r(SpS) ?=-9.9 Offset of Spitzer Smith
(2010MNRAS.406..952S 2010MNRAS.406..952S ) catalog source
127-130 F4.1 arcsec r(A08) ?=-9.9 Offset of Albacete 2008,
Cat. J/A+A/490/1055, source
133-154 A22 --- ID Historical star name
157-182 A26 --- SpType MK spectral type
185-225 A41 --- r_SpType Reference for SpType (1)
227-233 I7 --- K09ID ?=-99 Kharchenko 2009 catalog row identifier
(recno number in VizieR)
235-238 F4.1 mag K09Bmag ?=-9.9 Kharchenko 2009 B band magnitude
240-243 F4.1 mag K09Vmag ?=-9.9 Kharchenko 2009 V band magnitude
246-264 A19 --- PPMXLID PPMXL catalog row identifier
266-275 A10 --- UCAC3 UCAC3 catalog row identifier
277-284 I8 --- BSS ?=-99 UCAC BSS catalog row identifier
286-288 I3 --- C93ID ?=-99 Cudworth 1993 catalog row identifier
(recno number in VizieR)
290-293 F4.1 mag C93Vmag ?=-9.9 Cudworth 1993 catalog V band magnitude
295-298 F4.1 mag C93B-V ?=-9.9 Cudworth 1993 catalog (B-V) color
300-322 A23 --- D01ID Degioia 2001 catalog row identifier;
J2000 position
324-327 F4.1 mag D01Vmag ?=-9.9 Degioia 2001 catalog V band magnitude
329-332 F4.1 mag D01U-B ?=-9.9 Degioia 2001 catalog (U-B) band color
index
334-337 F4.1 mag D01B-V ?=-9.9 Degioia 2001 catalog (B-V) band color
index
339-356 A18 --- M01ID Massey 2001 catalog row identifier
358-360 I3 --- M93ID ?=-99 Massey 1993 catalog row identifier
362-365 F4.1 mag M93Vmag ?=-9.9 Massey 1993 catalog V band magnitude
367-370 F4.1 mag M93U-B ?=-9.9 Massey 1993 catalog (U-B) color index
372-375 F4.1 mag M93B-V ?=-9.9 Massey 1993 catalog (B-V) color index
377-379 I3 --- C01ID ?=-99 Carraro 2001 catalog row identifier
381-385 F5.1 mag C01Umag ?=-9.9 Carraro 2001 catalog U band magnitude
387-391 F5.1 mag C01Bmag ?=-9.9 Carraro 2001 catalog B band magnitude
393-397 F5.1 mag C01Vmag ?=-9.9 Carraro 2001 catalog V band magnitude
399-403 F5.1 mag C01Rmag ?=-9.9 Carraro 2001 catalog R band magnitude
405-409 F5.1 mag C01Imag ?=-9.9 Carraro 2001 catalog I band magnitude
411-425 A15 --- D07ID Delgado 2007 catalog row identifier
427-430 F4.1 mag D07Vmag ?=-9.9 Delgado 2007 catalog V band magnitude
432-435 F4.1 mag D07U-B ?=-9.9 Delgado 2007 catalog (U-B) color index
437-440 F4.1 mag D07B-V ?=-9.9 Delgado 2007 catalog (B-V) color index
442-445 F4.1 mag D07V-R ?=-9.9 Delgado 2007 catalog (V-Rc) color index
447-450 F4.1 mag D07V-I ?=-9.9 Delgado 2007 catalog (V-Ic) color index
452-455 F4.1 mag D07AV ?=-9.9 Delgado 2007 catalog V band extinction
457-474 A18 --- HI HAWK-I catalog row identifier; J2000 position
477-492 A16 --- 2MASS 2MASS catalog row identifier; J2000 position
494-497 F4.1 mag 2MJmag ?=-9.9 2MASS catalog J band magnitude
499-502 F4.1 mag 2MHmag ?=-9.9 2MASS catalog H band magnitude
504-507 F4.1 mag 2MKmag ?=-9.9 2MASS catalog Ks band magnitude
509-511 A3 --- 2M.q 2MASS catalog photometry quality flags
513-515 A3 --- 2Mcc 2MASS catalog CC flags
517-520 I4 --- SOFIID ?=-99 SOFI catalog row identifier (recno number
in VizieR)
522-525 F4.1 mag SOFIJmag ?=-9.9 SOFI catalog J band magnitude
527-530 F4.1 mag SOFIHmag ?=-9.9 SOFI catalog H band magnitude
532-535 F4.1 mag SOFIKmag ?=-9.9 SOFI catalog Ks band magnitude
537-540 I4 --- NACO ?=-99 NACO catalog row identifier (recno number
in VizieR)
542-545 F4.1 mag NACOJmag ?=-9.9 NACO catalog J band magnitude
547-550 F4.1 mag NACOHmag ?=-9.9 NACO catalog H band magnitude
552-555 F4.1 mag NACOKmag ?=-9.9 NACO catalog Ks band magnitude
557-560 I4 --- S10ID ?=-99 Sana 2010 catalog row identifier
562-565 F4.1 mag S10Hmag ?=-9.9 Sana 2010 catalog H band magnitude
567-570 F4.1 mag S10Kmag ?=-9.9 Sana 2010 catalog Ks band magnitude
572-596 A25 --- SpVID Spitzer Vela catalog row identifier
598-601 F4.1 mag V3.6mag ?=-9.9 Spitzer Vela catalog 3.6 micron band
magnitude
603-606 F4.1 mag V4.5mag ?=-9.9 Spitzer Vela catalog 4.5 micron band
magnitude
608-611 F4.1 mag V5.8mag ?=-9.9 Spitzer Vela catalog 5.8 micron band
magnitude
613-616 F4.1 mag V8.0mag ?=-9.9 Spitzer Vela catalog 8.0 micron band
magnitude
618-642 A25 --- SpS Spitzer Smith catalog row identifier
644-647 F4.1 mag S3.6mag ?=-9.9 Spitzer Smith catalog 3.6 micron band
magnitude
649-652 F4.1 mag S4.5mag ?=-9.9 Spitzer Smith catalog 4.5 micron band
magnitude
654-657 F4.1 mag S5.8mag ?=-9.9 Spitzer Smith catalog 5.8 micron band
magnitude
659-662 F4.1 mag S8.0mag ?=-9.9 Spitzer Smith catalog 8.0 micron band
magnitude
664-681 A18 --- A08ID Albacete 2008 catalog row identifier;
J2000 position
--------------------------------------------------------------------------------
Note (1): References as follows:
Skiff 2009 = Cat. B/mk
Rauw et al. (2001) = 2001MNRAS.326.1149R 2001MNRAS.326.1149R
Walborn et al. (2010) = 2010ApJ...711L.143W 2010ApJ...711L.143W
Albacete et al. (2002) = 2002MNRAS.336.1099A 2002MNRAS.336.1099A
Morrison & Conti (1980) = 1980ApJ...239..212M 1980ApJ...239..212M
Freyhammer et al. (2001) = 2001A&A...369..561F 2001A&A...369..561F
Rauw et al. (2000) = 2000A&A...360.1003R 2000A&A...360.1003R
--------------------------------------------------------------------------------
Global notes:
Note (G1): The first 14368 sources-the catalog used in other CCCP
studies-are sorted by RA; the 14369th source was identified too late
in the data analysis process to be conveniently inserted at its
rightful position in the table.
Note (G2): Source labels identify a CCCP pointing (Townsley et al.
2011ApJS..194....1T 2011ApJS..194....1T, Table 1, target_NNNN); they do not convey
membership in astrophysical clusters.
--------------------------------------------------------------------------------
History:
From electronic version of the journal
References:
Townsley et al. CCCP introduction 2011ApJS..194....1T 2011ApJS..194....1T
Broos et al. CCCP catalog Cat. J/ApJS/194/2
Getman et al. Contamination in X-ray studies 2011ApJS..194....3G 2011ApJS..194....3G
Broos et al. Source classifier Cat. J/ApJS/194/4
Gagne et al. O and B stars Cat. J/ApJS/194/5
Povich et al. Cand. X-ray emitting OB stars Cat. J/ApJS/194/6
Naze et al. O and B stars X-ray properties Cat. J/ApJS/194/7
Parkin et al. QZ Car (HD 93206) 2011ApJS..194....8P 2011ApJS..194....8P
Feigelson et al. X-ray star clusters Cat. J/ApJS/194/9
Preibisch et al. NIR properties of YSO Cat. J/ApJS/194/10
Wang et al. Trumpler 15 Cat. J/ApJS/194/11
Wolk et al. Trumpler 16 Cat. J/ApJS/194/12
Povich et al. Pan-Carina YSO catalog Cat. J/ApJS/194/14
Evans et al. Companions of B stars in Tr 16 2011ApJS..194...13E 2011ApJS..194...13E
Townsley et al. Diffuse X-ray emission Cat. J/ApJS/194/15
Townsley et al. Comparison of diffuse emission 2011ApJS..194...16T 2011ApJS..194...16T
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 20-May-2011