Letter to the Editor

The structured environments of embedded star-forming cores ^*

PACS and SPIRE mapping of the enigmatic outflow source UYSO 1

¹ Max-Planck-Instritut für Astronomie (MPIA) Heidelberg, Königstuhl 17, 69117 Heidelberg, Germany e-mail: [linz;krause;beuther;henning;nielbock;stein;stutz]@mpia.de
² Space Sciences Laboratory, University of California, Berkeley, CA 94720, USA; e-mail: r_klein@calmail.berkeley.edu
³ Thüringer Landessternwarte Tautenburg (TLS), Sternwarte 5, 07778 Tautenburg, Germany e-mail: stecklum@tls-tautenburg.de
⁴ LERMA, Observatoire de Paris, 61 Av. de l'Observatoire, 75 014 Paris, France

Received: 31 March 2010
Accepted: 3 May 2010

Abstract

The intermediate-mass star-forming core UYSO 1 has previously been found to exhibit intriguing features. While deeply embedded and previously only identified by means of its (sub-)millimeter emission, it drives two powerful, dynamically young, molecular outflows. Although the process of star formation has obviously started, the chemical composition is still pristine. We present Herschel PACS and SPIRE continuum data of this presumably very young region. The now complete coverage of the spectral energy peak allows us to precisely constrain the elevated temperature of 26–28 K for the main bulge of gas associated with UYSO1, which is located at the interface between the hot H ii region Sh 2-297 and the cold dark nebula LDN 1657A. Furthermore, the data identify cooler compact far-infrared sources of just a few solar masses, hidden in this neighbouring dark cloud.