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A Herschel study of YSO evolutionary stages and formation timelines in two fields of the Hi-GAL survey

Elia, D., Schisano, Eugenio, Molinari, Sergio, Robitaille, Thomas P., Anglés-Alcázar, Daniel, Bally, John, Battersby, C, Benedettini, Milena, Billot, Nicolas, Calzoletti, Luca, and others. (2010) A Herschel study of YSO evolutionary stages and formation timelines in two fields of the Hi-GAL survey. Astronomy & Astrophysics, 518 (8). 0-0. ISSN 0004-6361. (doi:10.1051/0004-6361/201014651) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided. (Contact us about this Publication)
Official URL
http://dx.doi.org/10.1051/0004-6361/201014651

Abstract

We present a first study of the star-forming compact dust condensations revealed by Herschel in the two 2° × 2° Galactic Plane fields centered at [, b] = [30°, 0°] and [, b] =[59°, 0°] , respectively, and observed during the science demonstration phase for the Herschel Infrared GALactic plane survey (Hi-GAL) key-project. Compact source catalogs extracted for the two fields in the five Hi-GAL bands (70, 160, 250, 350 and 500 ?m) were merged based on simple criteria of positional association and spectral energy distribution (SED) consistency into a final catalog which contains only coherent SEDs with counterparts in at least three adjacent Herschel bands. These final source lists contain 528 entries for the = 30° field, and 444 entries for the = 59° field. The SED coverage has been augmented with ancillary data at 24 ?m?and 1.1 mm. SED modeling for the subset of 318 and 101 sources (in the two fields, respectively) for which the distance is known was carried out using both a structured star/disk/envelope radiative transfer model and a simple isothermal grey-body. Global parameters like mass, luminosity, temperature and dust properties have been estimated. The Lbol/Menv ratio spans four orders of magnitudes from values compatible with the pre-protostellar phase to embedded massive zero-age main sequence stars. Sources in the = 59° field have on average lower L/M, possibly outlining an overall earlier evolutionary stage with respect to the sources in the = 30° field. Many of these cores are actively forming high-mass stars, although the estimated core surface densities appear to be an order of magnitude below the 1 g cm-2 critical threshold for high-mass star formation.

Item Type: Article
DOI/Identification number: 10.1051/0004-6361/201014651
Uncontrolled keywords: stars ; formation ; pre-main sequence
Subjects: Q Science > QB Astronomy > QB460 Astrophysics
Divisions: Faculties > Sciences > School of Physical Sciences > Centre for Astrophysics and Planetary Sciences
Depositing User: Giles Tarver
Date Deposited: 10 Aug 2015 15:54 UTC
Last Modified: 29 May 2019 15:54 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/50088 (The current URI for this page, for reference purposes)
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