Infrared spectroscopy of a massive obscured star cluster in the Antennae galaxies (NGC 4038/4039) with NIRSPEC

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dc.contributor.author Gilbert, Andrea en_US
dc.contributor.author Graham, James en_US
dc.contributor.author McLean, Ian en_US
dc.contributor.author Becklin, Eric en_US
dc.contributor.author Figer, Donald en_US
dc.contributor.author Larkin, James en_US
dc.contributor.author Levenson, Nancy en_US
dc.contributor.author Teplitz, Harry en_US
dc.contributor.author Wilcox, Mavourneen en_US
dc.date.accessioned 2006-06-13T17:05:21Z en_US
dc.date.available 2006-06-13T17:05:21Z en_US
dc.date.issued 2000 en_US
dc.identifier.citation European Space Agency SP-445 en_US
dc.identifier.isbn 929-09-2780-1 en_US
dc.identifier.uri http://hdl.handle.net/1850/1996 en_US
dc.description Also archived in: arXiv:astro-ph/9912369 v1 17 Dec 1999 AND "Star Formation from the Small to the Large Scale", Proceedings of the 33rd ESLAB Symposium. Held in Noordwijk, The Netherlands: 2-5 Nov 1999. en_US
dc.description.abstract We present infrared spectroscopy of the Antennae Galaxies (NGC 4038/4039) with NIRSPEC at the W. M. Keck Observatory. We imaged the star clusters in the vicinity of the southern nucleus (NGC 4039) in 0′′.39 seeing in K-band using NIRSPEC’s slit-viewing camera. The brightest star cluster revealed in the near-IR (MK(0) ≃ −17.9) is insignificant optically, but coincident with the highest surface brightness peak in the mid-IR (12−18µm) ISO image presented by Mirabel et al. (1998).We obtained high signal-to-noise 2.03−2.45 µm spectra of the nucleus and the obscured star cluster at R ∼ 1900. The cluster is very young (age ∼ 4 Myr), massive (M ∼ 16 × 106 M⊙), and compact (density ∼ 115 M⊙ pc−3 within a 32 pc half-light radius), assuming a Salpeter IMF (0.1−100 M⊙). Its hot stars have a radiation field characterized by Teff ∼ 39, 000 K, and they ionize a compact H ii region with ne ∼ 104 cm−3. The stars are deeply embedded in gas and dust (AV ∼ 9 − 10 mag), and their strong FUV field powers a clumpy photodissociation region with densities nH >∼ 105 cm−3 on scales of ∼ 200 pc, radiating LH21−0 S(1) = 9600 L⊙. (Refer to PDF file for exact formulas). en_US
dc.description.sponsorship AMG acknowledges support from a NASA GSRP grant. en_US
dc.format.extent 301019 bytes en_US
dc.format.mimetype application/pdf en_US
dc.language.iso en_US en_US
dc.publisher European Space Agency Publications en_US
dc.relation.ispartofseries SP-445 en_US
dc.subject Galaxies-H II regions en_US
dc.subject Galaxies-individual (NGC 4038) en_US
dc.subject Galaxies-individual (NGC 4039) en_US
dc.subject Galaxies-individual (Antennae Galaxies) en_US
dc.subject Galaxies-star clusters en_US
dc.title Infrared spectroscopy of a massive obscured star cluster in the Antennae galaxies (NGC 4038/4039) with NIRSPEC en_US
dc.type Proceedings en_US

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