2006ApJ...648L..25S

Query : 2006ApJ...648L..25S

2006ApJ...648L..25S - Astrophys. J., 648, L25-L28 (2006/September-1)

Subarcsecond resolution mid-infrared observations of super star clusters in the Antennae (NGC 4038/4039).

SNIJDERS L., VAN DER WERF P.P., BRANDL B.R., MENGEL S., SCHAERER D. and WANG Z.

Abstract (from CDS):

We present ground-based subarcsecond mid-infrared imaging and spectroscopy of young super star clusters in the overlap region of the merging galaxies NGC 4038/4039 (the Antennae) obtained with the VLT Imager and Spectrometer for mid-InfraRed (VISIR). With its unprecedented spatial resolution, VISIR begins for the first time to resolve the H II/photodissociation region complexes around the star-forming regions. In the N-band spectra of two young star clusters, unexpectedly low polycyclic aromatic hydrocarbon (PAH) emission is observed, compared to what is seen with the Infrared Space Observatory and with the Spitzer Space Telescope. We conclude that a large fraction of the PAH emission cannot be directly associated with the super star clusters but originates from an extended region of at least 215 pc radius around the clusters. In the distribution of [Ne II] 12.81 µm emission, a highly obscured cluster is discovered that does not have an optical or near-infrared counterpart.

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Journal keyword(s): ISM: Dust, Extinction - Galaxies: Individual: NGC Number: NGC 4038 - Galaxies: Individual: NGC Number: NGC 4039 - Galaxies: Star Clusters

Nomenclature: Fig.1: [SVB2006] Na (Nos 1-2, 1a, 1b).

Simbad objects: 12

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Number of rows : 12
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 * eps Crt * 11 24 36.5912121144 -10 51 33.575503752   6.338 4.802     K4III 95 0
2 NGC 4038 EmG 12 01 53.002 -18 52 03.32   10.91   9.74 11.0 ~ 1364 1
3 NAME Antennae IG 12 01 53.170 -18 52 37.92           ~ 1749 0
4 NGC 4039 GiP 12 01 53.51 -18 53 10.3   11.08   9.77   ~ 1173 1
5 [WS95] 86 Cl* 12 01 54.5 -18 53 02           ~ 2 0
6 [BCE2005] 157 Cl* 12 01 54.89 -18 53 04.9     23.5     ~ 23 0
7 [BCE2005] 136 PoG 12 01 54.9 -18 53 04           ~ 37 0
8 * iot Cen PM* 13 20 35.8128156095 -36 42 44.296492410 2.77 2.76 2.73 2.68 2.69 kA1.5hA3mA3Va 218 0
9 * bet Lib PM* 15 17 00.41382 -09 22 58.4919 2.14 2.51 2.62 2.67 2.76 B8Vn 283 0
10 * sig Oph V* 17 26 30.8807335272 +04 08 25.293765444 7.39 5.82 4.31 3.22 2.46 K2II 183 0
11 [SVB2006] 1b IR ~ ~           ~ 1 0
12 [WS95] 87 Cl* ~ ~           ~ 2 0

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