2002A&A...395..169B

Query : 2002A&A...395..169B

2002A&A...395..169B - Astronomy and Astrophysics, volume 395169-177 (2002/11-3)

Hard X-ray emission from a young massive star-forming cluster.

BEUTHER H., KERP J., PREIBISCH T., STANKE T. and SCHILKE P.

Abstract (from CDS):

We report the detection of hard X-ray emission (>2keV) from a number of point sources associated with the very young massive star-forming region IRAS 19410+2336. The X-ray emission is detected from several sources located around the central and most deeply embedded mm continuum source, which remains undetected in the X-ray regime. All X-ray sources have K-band counterparts, and those likely belonging to the evolving massive cluster show near-infrared colors in the 2MASS data indicative of pre-main-sequence stages. The X-ray luminosities around 1031 erg/s are at the upper end of luminosities known for low-mass pre-main-sequence sources, and mass estimates based on the infrared data indicate that at least some of the X-ray detected sources are intermediate-mass objects. Therefore, we conclude that the X-ray emission is due to intermediate-mass pre-main-sequence Herbig Ae/Be stars or their precursors. The emission process is possibly due to magnetic star-disk interaction as proposed for their low-mass counterparts.

Abstract Copyright: ∼

Journal keyword(s): accretion, accretion disks - stars: early type - stars: formation - ISM: dust, extinction - mechanisms: thermal radiation

Nomenclature: Table 1: [BKP2002b] XNN (Nos X1-X13).

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 - 2026 		#notes
1 W 3 MoC 02 27 04.10 +61 52 27.1           ~ 1064 3
2 RAFGL 618 pA* 04 42 53.6242032600 +36 06 53.400902220   16.32   12.59   C-rich 1027 0
3 M 42 HII 05 35 16.8 -05 23 15           ~ 4411 0
4 OMC 3 MoC 05 35 20.0 -05 01 00           ~ 301 1
5 NAME Ori A MoC 05 38 -07.1           ~ 3187 0
6 NAME Mon R 2 GMC MoC 06 07.6 -06 23           ~ 27 1
7 NAME Mon R2 HII 06 07 47.58 -06 22 42.6           ~ 789 2
8 NAME Rosette Molecular Cloud MoC 06 34.7 +04 02           ~ 277 0
9 EM* MWC 297 Ae* 18 27 39.5265500160 -03 49 52.133050776 15.57 14.34 12.31 11.34   B1.5Ve 315 0
10 ICRF J192559.6+210626 BLL 19 25 59.60535459 +21 06 26.1620257           ~ 212 1
11 [BKP2002b] X11 X 19 43 07.7 +23 44 49           ~ 1 0
12 2MASS J19430860+2344255 Y*O 19 43 08.603 +23 44 25.59           ~ 2 0
13 2MASS J19430895+2344365 * 19 43 08.9703315912 +23 44 36.063108600           ~ 1 0
14 [BKP2002b] X 4 X 19 43 09.4 +23 44 01           ~ 1 0
15 [BKP2002b] X 3 X 19 43 09.6 +23 43 58           ~ 1 0
16 2MASS J19431060+2344575 Y*O 19 43 10.5877230360 +23 44 58.301666736           ~ 7 0
17 [BKP2002b] X 1 * 19 43 10.8678236928 +23 44 04.654138452           ~ 1 0
18 [BKP2002b] X 2 X 19 43 11.0 +23 44 16           ~ 1 0
19 MSX6C G059.7831+00.0648 Y*O 19 43 11.2464 +23 44 03.270           ~ 159 0
20 2MASS J19431153+2343376 Y*O 19 43 11.5280362320 +23 43 37.416617976           ~ 2 0
21 IRAS 19410+2336 SFR 19 43 11.5 +23 44 06           ~ 160 0
22 [BKP2002b] X 6 Y*O 19 43 11.8417655064 +23 43 53.092081524           ~ 2 0
23 [BKP2002b] X 5 X 19 43 12.5 +23 44 22           ~ 1 0
24 2MASS J19431340+2345161 X 19 43 13.4112438672 +23 45 16.090528752           ~ 1 0
25 2MASS J19431424+2345150 * 19 43 14.2434142920 +23 45 15.058088208           ~ 1 0
26 QSO B2023+336 BLL 20 25 10.84210426 +33 43 00.2143556           ~ 188 1
27 EM* MWC 349 ** 20 32 45.499080 +40 39 36.74124   15.88 13.15 12.13   Bep 837 0

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