J/ApJ/820/L28 XMM obs. of two regions west to κ Ori (Pillitteri+, 2016)
A star-forming ring around κ Ori 250 pc from the Sun.
Pillitteri I., Wolk S.J., Megeath S.T.
<Astrophys. J., 820, L28 (2016)>
=2016ApJ...820L..28P 2016ApJ...820L..28P (SIMBAD/NED BibCode)
ADC_Keywords: YSOs ; X-ray sources ; Photometry, infrared
Keywords: stars: activity; stars: formation;
stars: individual: (Ori A, L1641, Kappa Ori)
Abstract:
X-rays are a powerful probe of activity in early stages of star
formation. They allow us to identify young stars even after they have
lost the IR signatures of circumstellar disks and provide constraints
on their distance. Here, we report on XMM-Newton observations that
detect 121 young stellar objects (YSOs) in two fields between L1641S
and κ Ori. These observations extend the Survey of Orion A with
XMM and Spitzer (SOXS). The YSOs are contained in a ring of gas and
dust apparent at millimeter wavelengths, and in far-IR and near-IR
surveys. The X-ray luminosity function of the YSOs detected in the two
fields indicates a distance of 250-280pc, much closer than the Orion A
cloud and similar to distance estimates of κ Ori. We propose
that the ring is a 5-8pc diameter shell that has been swept up by
κ Ori. This ring contains several groups of stars detected by
Spitzer and WISE including one surrounding the Herbig Ae/Be stars
V1818 Ori. In this interpretation, the κ Ori ring is one of
several shells swept up by massive stars within the Orion Eridanus
Superbubble and is unrelated to the southern portion of OrionA/L1641S.
Description:
The XMM-Newton observations of two fields, north (Field N = KN) and
south (Field S = KS), were obtained in 2015 March 10 and 15 using EPIC
as the primary instrument.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 63 238 *List of X-ray sources detected in fields
KN (North) and KS (South)
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Note on table2.dat: Properties of the XMM-Newton observations as given in
table 1:
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Name ObsId RA (J2000) DE Exp time (ks)
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Field S (KS) 0740570201 05 42 41 -9 56 45 52.8 (pn)
Field N (KN) 0740570101 05 41 00 -9 27 00 48.5 (pn)
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Both fields have been been observed with EPIC as the primary instrument
and Medium filter.
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See also:
B/xmm : XMM-Newton Observation Log (XMM-Newton Science Operation Center, 2012)
J/ApJ/818/59 : IN-SYNC. IV. YSOs in Orion A (Da Rio+, 2016)
J/A+A/566/A45 : Orion optical-depth and column-density maps (Lombardi+, 2014)
J/ApJS/207/5 : YSOs in LDN 1641 with Hectochelle spectra (Fang+, 2013)
J/ApJ/768/99 : X-ray survey of YSOs in Orion A (Pillitteri+, 2013)
J/AJ/144/192 : Spitzer survey of Orion A & B. I. YSO catalog (Megeath+, 2012)
J/ApJ/752/59 : Low-mass population in L1641 (Hsu+, 2012)
J/A+A/504/461 : YSOs in L1630N and L1641 (Fang+, 2009)
J/ApJ/676/1109 : Velocities of stars in the ONC (Furesz+, 2008)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq Running sequence number
5- 6 I2 h RAh [5] Hour of Right Ascension (J2000)
8- 9 I2 min RAm [40/43] Minute of Right Ascension (J2000)
11- 14 F4.1 s RAs Second of Right Ascension (J2000)
16 A1 --- DE- [-] Sign of the Declination (J2000)
17- 18 I2 deg DEd [9/10] Degree of Declination (J2000)
20- 21 I2 arcmin DEm Arcminute of Declination (J2000)
23- 26 F4.1 arcsec DEs Arcsecond of Declination (J2000)
28- 32 F5.1 ct/ks Rate [0.1/350] XMM-Newtonw 0.3-8keV count rate
34- 37 F4.2 ct/ks e_Rate [0.05/3] Error in Rate
39- 44 F6.2 10-17W/m2 Flux [0.1/156] Unabsorbed 0.3-8 keV band flux
in units of 1e-14erg/s/cm2
46 I1 --- Pr [0/1]? Protostar classification (1=yes) (2)
48 I1 --- Dk [0/1]? Star with a disk (1=yes) (2)
50 I1 --- C3 [0/1]? Class III star (1=yes)
52- 56 F5.2 mag 3.6mag ? WISE 3.6 micron band magnitude
59- 63 F5.2 mag 3.6-12 ? WISE (3.6-12) micron band color index
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Note (2): Megeath et al. (2012, J/AJ/144/192).
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 02-Jun-2016