2005ApJS..160..503T


Query : 2005ApJS..160..503T

2005ApJS..160..503T - Astrophys. J., Suppl. Ser., 160, 503-510 (2005/October-0)

Iron fluorescent line emission from young stellar objects in the Orion nebula.

TSUJIMOTO M., FEIGELSON E.D., GROSSO N., MICELA G., TSUBOI Y., FAVATA F., SHANG H. and KASTNER J.H.

Abstract (from CDS):

We present the result of a systematic search for the iron Kα fluorescent line at ∼6.4 keV among 1616 X-ray sources detected by ultradeep Chandra observations of the Orion Nebula Cluster and the obscured Orion Molecular Cloud 1 population as part of the Chandra Orion Ultradeep Project (COUP). Seven sources are identified to have an excess emission at ∼6.4 keV among 127 control sample sources with significant counts in the 6.0-9.0 keV band. These seven sources are young stellar objects (YSOs) characterized by intense flarelike flux variations, thermal spectra, and near-infrared (NIR) counterparts. The observed equivalent widths of the line cannot be attributed to the florescence by interstellar or circumstellar matter along the line of sight. The X-ray spectral fits and NIR colors of the 6.4 keV sources show that these sources have X-ray absorption of ≳1x1022/cm2 and NIR excess emission, which is not expected when the fluorescence occurs at the stellar photosphere. We therefore conclude that the iron fluorescent line of YSOs arises from reflection off of circumstellar disks, which are irradiated by the hard X-ray continuum emission of magnetic reconnection flares.

Abstract Copyright:

Journal keyword(s): ISM: Individual: Alphanumeric: OMC-1 - Galaxy: Open Clusters and Associations: Individual: Name: Orion Nebula Cluster - Scattering - Stars: Pre-Main-Sequence - X-Rays: Stars

Simbad objects: 27

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Number of rows : 27
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 CXOONC J053439.6-052458 X 05 34 39.820 -05 24 56.31           ~ 5 0
2 V* KM Ori Or* 05 34 55.9724775000 -05 23 13.041837816 14.142 12.883 11.918   10.064 K5Ve 93 0
3 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2175 1
4 JW 290 Y*O 05 35 06.4244933736 -05 27 04.798672848   21.353 19.819 16.93 14.972 M4.7e 38 0
5 COUP 272 V* 05 35 06.50088 -05 26 54.8628           ~ 5 0
6 CXOONC J053506.6-051622 X 05 35 06.576 -05 16 24.06           ~ 4 0
7 2MASS J05350822-0524032 Y*O 05 35 08.2384942560 -05 24 03.196821312   14.2     15.508 M4.5 29 0
8 V* V1486 Ori Or* 05 35 09.2086927272 -05 30 58.528251000     21.130 18.31 15.660 K5-K8e 42 0
9 2MASS J05350934-0521415 Y*O 05 35 09.3423344856 -05 21 41.621788692         18.521 ~ 19 0
10 2MASS J05351362-0519548 Y*O 05 35 13.6228023552 -05 19 54.807794832   14.0 18.903   13.964 K5 45 0
11 NAME OMC-1 MoC 05 35 14 -05 22.4           ~ 1119 2
12 COUP 621 Y*O 05 35 14.35371 -05 22 32.8820           ~ 106 0
13 [OW94] 147-302 Y*O 05 35 14.6648362632 -05 23 01.814574804     19.12   14.898 M0.5-M2.5 45 0
14 NAME ORBS Y*O 05 35 14.665 -05 22 11.06           ~ 22 1
15 COUP 723 X 05 35 15.60361 -05 21 26.8917           ~ 9 0
16 M 42 HII 05 35 17.3 -05 23 28           ~ 3939 0
17 V* V2350 Ori Or* 05 35 19.3704 -05 25 42.090           ~ 16 0
18 V* V2355 Ori Or* 05 35 19.6558463448 -05 13 26.442022440         18.456 ~ 28 0
19 V* V2359 Ori Or* 05 35 19.8325136616 -05 15 08.983466064         17.381 ~ 27 0
20 2XMM J053524.6-052759 AG? 05 35 24.707 -05 27 59.49           ~ 10 0
21 * eta Car Em* 10 45 03.5377808928 -59 41 04.051599720 6.37 7.03 6.48 4.90 4.41 OBepec 2342 0
22 ESO 134-11 HII 14 40 29 -62 38.7           ~ 545 1
23 SNR G315.0-02.3 SNR 14 43 00 -62 30.0           ~ 358 1
24 YLW 16A Y*O 16 27 28.02744 -24 39 33.5052           K8 189 0
25 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 13206 0
26 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 2122 1
27 NAME Coronet Cluster Cl* 19 01 54 -36 57.2           ~ 86 1

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2022.10.07-15:27:29

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