NAOC Open IR  > 应用天文研究部
A Herschel study of YSO evolutionary stages and formation timelines in two fields of the Hi-GAL survey
Elia, D.1,2; Schisano, E.1,3; Molinari, S.1; Robitaille, T.4; Angles-Alcazar, D.5; Bally, J.7; Battersby, C.7; Benedettini, M.1; Billot, N.8; Calzoletti, L.9; Di Giorgio, A. M.1; Faustini, F.9; Li, J. Z.10; Martin, P.11,12; Morgan, L.13; Motte, F.14; Mottram, J. C.15; Natoli, P.22; Olmi, L.6,16; Paladini, R.17; Piacentini, F.23; Pestalozzi, M.1; Pezzuto, S.1; Polychroni, D.1; Smith, M. D.18; Strafella, F.19; Stringfellow, G. S.7; Testi, L.20; Thompson, M. A.21; Traficante, A.22; Veneziani, M.23
摘要We present a first study of the star-forming compact dust condensations revealed by Herschel in the two 2 degrees x2 degrees Galactic Plane fields centered at [l, b] = [30 degrees, 0 degrees] and [l, b] = [59 degrees, 0 degrees], 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 mu 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 l = 30 degrees field, and 444 entries for the l = 59 degrees field. The SED coverage has been augmented with ancillary data at 24 mu 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 L(bo)l/M(env) 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 l = 59 degrees field have on average lower L/M, possibly outlining an overall earlier evolutionary stage with respect to the sources in the l = 30 degrees 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.
关键词Stars: Formation Stars: Pre-main Sequence
作者单位1.INAF, Ist Fis Spazio Interplanetario, I-00133 Rome, Italy
2.Observ Astron Lisboa, P-1349018 Lisbon, Portugal
3.Univ Naples Federico 2, Dipartimento Sci Fisiche, Naples, Italy
4.Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
5.Univ Arizona, Dept Phys, Tucson, AZ 85721 USA
6.Univ Puerto Rico, Dept Phys, UPR Stn, San Juan, PR 00936 USA
7.Univ Colorado, Ctr Astrophys & Space Astron, Boulder, CO 80309 USA
8.CALTECH, NASA, Herschel Sci Ctr, IPAC, Pasadena, CA 91125 USA
9.ASI Sci Data Ctr, I-00044 Frascati, Italy
10.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
11.Univ Toronto, Canadian Inst Theoret Astrophys, Toronto, ON M5S 3H8, Canada
12.Univ Toronto, Dept Astron & Astrophys, Toronto, ON M5S 3H4, Canada
13.Liverpool John Moores Univ, Astrophys Res Inst, Birkenhead CH41 1LD, Merseyside, England
14.Univ Paris Diderot, Lab AIM, CEA IRFU, CNRS,Serv Astrophys, F-91191 Gif Sur Yvette, France
15.Univ Exeter, Sch Phys, Exeter EX4 4QL, Devon, England
16.INAF Osservatorio Astrofis Arcetri, I-50125 Florence, Italy
17.CALTECH, Spitzer Sci Ctr, IPAC, Pasadena, CA 91125 USA
18.Univ Kent, Ctr Astrophys & Planetary Sci, Canterbury CT2 7NH, Kent, England
19.Univ Salento, Dipartimento Fis, I-73100 Lecce, Italy
20.ESO, D-85748 Garching, Germany
21.Univ Hertfordshire, Ctr Astrophys Res, Hatfield AL10 9AB, Herts, England
22.Univ Roma Tor Vergata, Dipartimento Fis, I-00173 Rome, Italy
23.Univ Roma 1 La Sapienza, Dipartimento Fis, Rome, Italy
GB/T 7714
Elia, D.,Schisano, E.,Molinari, S.,et al. A Herschel study of YSO evolutionary stages and formation timelines in two fields of the Hi-GAL survey[J]. ASTRONOMY & ASTROPHYSICS,2010,518.
APA Elia, D..,Schisano, E..,Molinari, S..,Robitaille, T..,Angles-Alcazar, D..,...&Veneziani, M..(2010).A Herschel study of YSO evolutionary stages and formation timelines in two fields of the Hi-GAL survey.ASTRONOMY & ASTROPHYSICS,518.
MLA Elia, D.,et al."A Herschel study of YSO evolutionary stages and formation timelines in two fields of the Hi-GAL survey".ASTRONOMY & ASTROPHYSICS 518(2010).
[Elia, D.]的文章
[Schisano, E.]的文章
[Molinari, S.]的文章
[Elia, D.]的文章
[Schisano, E.]的文章
[Molinari, S.]的文章
[Elia, D.]的文章
[Schisano, E.]的文章
[Molinari, S.]的文章
所有评论 (0)