J/A+A/602/A115 X-ray survey of NGC7000/IC5070 (Damiani+, 2017)
X-ray survey of the North-America and Pelican star-forming complex
(NGC7000/IC5070).
Damiani F., Pillitteri I., Prisinzano L.
<Astron. Astrophys. 602, A115 (2017)>
=2017A&A...602A.115D 2017A&A...602A.115D (SIMBAD/NED BibCode)
ADC_Keywords: H II regions ; Infrared sources ; Interstellar medium ;
Nebulae ; Photometry ; Stars, pre-main sequence ;
X-ray sources
Keywords: stars: pre-main-sequence - X-ray: stars -
ISM : individual objects: NGC 7000
Abstract:
We present the first extensive X-ray study of the North-America and
Pelican star-forming region (NGC7000/IC5070), with the aim of finding
and characterizing the young population of this cloud. X-ray data from
Chandra (four pointings) and XMM-Newton (seven pointings) were reduced
and source detection algorithm applied to each image. We complement
the X-ray data with optical and near-IR data from the IPHAS, UKIDSS,
and 2MASS catalogs, and with other published optical and Spitzer IR
data. More than 700 X-ray sources are detected, the majority of which
have an optical or NIR counterpart. This allowed us to identify young
stars in different stages of formation. Less than 30% of X-ray sources
are identified with a previously known young star. We argue that most
X-ray sources with an optical or NIR counterpart, except perhaps for a
few tens at near-zero reddening, are likely candidate members of the
star-forming region, on the basis of both their optical and NIR
magnitudes and colors, and of X-ray properties such as spectrum
hardness or flux variations. They are characterized by a wide range of
extinction, and sometimes near-IR excesses, both of which prevent
derivation of accurate stellar parameters. The optical color-magnitude
diagram suggests ages between 1-10Myrs. The X-ray members have a very
complex spatial distribution with some degree of subclustering,
qualitatively similar to that of previously known members. The
detailed distribution of X-ray sources relative to the objects with IR
excesses identified with Spitzer is sometimes suggestive of sequential
star formation, especially near the 'Gulf of Mexico' region, probably
triggered by the O5 star which illuminates the whole region. We
confirm that around the O5 star no enhancement in the young star
density is found, in agreement with previous results. Thanks to the
precision and depth of the IPHAS and UKIDSS data used, we also
determine the local optical-IR reddening law, and compute an updated
reddening map of the entire region.
Description:
We present a catalog of X-ray sources, with their optical and near-IR
identifications, in the NGC7000/IC5070 (North America/Pelican) star
formation complex. Using UKIDSS and IPHAS photometry, we also report
additional pre-main-sequence members of the complex showing NIR
excesses or H-alpha emission.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 107 721 X-ray source properties
table4.dat 46 721 X-ray source identifications
table5.dat 65 273 NIR-excess and Halpha-emission stars
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See also:
IX/50 : XMM-Newton Serendipitous Source Cat. 3XMM-DR6 (XMM-SSC, 2016)
J/ApJS/193/25 : The NAN complex. II. MIPS observations (Rebull+, 2011)
J/ApJS/224/40 : Catalog of Chandra ACIS point like sources (Wang+, 2016)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- X-rayId [1/721] Unique X-ray source ID
5- 20 A16 --- CXOId IAU designation of Chandra X-ray detections
(JHHMMSS.s+DDMMSS)
22- 37 A16 --- XMMId IAU designation of XMM X-ray detections
(JHHMMSS.s+DDMMSS)
39- 47 F9.5 deg RAdeg Right ascension (J2000)
49- 56 F8.5 deg DEdeg Declination (J2000)
58- 61 F4.2 arcsec e_pos Position error of X-ray source
63- 70 F8.3 ct/ks CRate X-ray count-rate
72- 77 F6.3 ct/ks e_CRate Error on CRate
79- 83 F5.2 --- ACIS-HR1 ? Hardness ratio 1 for Chandra ACIS sources
85- 89 F5.2 --- ACIS-HR2 ? Hardness ratio 2 for Chandra ACIS sources
91- 95 F5.2 --- XMM-HR1 ? Hardness ratio 1 for XMM EPIC sources
97-101 F5.2 --- XMM-HR2 ? Hardness ratio 2 for XMM EPIC sources
103-107 F5.2 [10-7W] logLX ? log of X-ray luminosity
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- X-rayId [1/721] Unique X-ray source ID
5- 9 F5.2 mag imag ? Magnitude in i band from IPHAS
11- 14 F4.2 mag r-i ? Color index r-i from IPHAS
16- 19 F4.2 mag r-Ha ? Color index r-Halpha from IPHAS
21- 25 F5.2 mag Jmag ? Magnitude in J band from UKIDSS/2MASS
27- 31 F5.2 mag Hmag ? Magnitude in H band from UKIDSS/2MASS
33- 37 F5.2 mag Kmag ? Magnitude in K band from UKIDSS/2MASS
39 A1 --- IR-excess [Y] Star with NIR excess
41 A1 --- Ha-emiss [Y] Star with Halpha emission
43- 46 I4 --- [RGS2011] ? Sequential number in Rebull et al.
(2011, Cat. J/ApJS/193/25)
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [722/994] Unique X-ray undetected member ID
5- 13 F9.5 deg RAdeg Right ascension (J2000)
15- 22 F8.5 deg DEdeg Declination (J2000)
24- 28 F5.2 mag imag ? Magnitude in i band from IPHAS
30- 33 F4.2 mag r-i ? Color index r-i from IPHAS
35- 38 F4.2 mag r-Ha ? Color index r-Halpha from IPHAS
40- 44 F5.2 mag Jmag ? Magnitude in J band from UKIDSS/2MASS
46- 50 F5.2 mag Hmag ? Magnitude in H band from UKIDSS/2MASS
52- 56 F5.2 mag Kmag ? Magnitude in K band from UKIDSS/2MASS
58 A1 --- IR-excess [Y] Star with NIR excess
60 A1 --- Ha-emiss [Y] Star with Halpha emission
62- 65 I4 --- [RGS2011] ? Sequential number in Rebull et al.
(2011, Cat. J/ApJS/193/25)
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Acknowledgements:
Francesco Damiani, damiani(at)astropa.inaf.it
(End) Francesco Damiani [INAF-OAPA, Italy], Patricia Vannier [CDS] 10-Apr-2017