The HP2 Survey.

Autor(en)

Birgit Hasenberger, Marco Lombardi, João Alves, Jan Forbrich, Alvaro Hacar, Charles J. Lada

Abstrakt

Multi-wavelength observations in the sub-millimeter regime provide information on the distribution of both the dust column density and the effective dust temperature in molecular clouds. In this study, we created high-resolution and high-dynamic-range maps of the Pipe nebula region and explored the value of dust-temperature measurements in particular towards the dense cores embedded in the cloud. The maps are based on data from the Herschel and Planck satellites, and calibrated with a near-infrared extinction map based on 2MASS observations. We have considered a sample of previously defined cores and found that the majority of core regions contain at least one local temperature minimum. Moreover, we observed an anti-correlation between column density and temperature. The slope of this anti-correlation is dependent on the region boundaries and can be used as a metric to distinguish dense from diffuse areas in the cloud if systematic effects are addressed appropriately. Employing dust-temperature data thus allows us to draw conclusions on the thermodynamically dominant processes in this sample of cores: external heating by the interstellar radiation field and shielding by the surrounding medium. In addition, we have taken a first step towards a physically motivated core definition by recognising that the column-density-temperature anti-correlation is sensitive to the core boundaries. Dust-temperature maps therefore clearly contain valuable information about the physical state of the observed medium. HP2 stands for Herschel-Planck-2MASS dust-optical-depth and column-density maps (see Lombardi et al. 2014, Zari et al. 2016, Lada et al. 2017).The reduced Herschel-Planck map, and the column-density and temperature maps are only available at the CDS via. anonymous ftp to cdsarc.u-strasbg.fr (ftp://130.79.128.5) or via cdsarc.u-strasbg.fr/viz-bin/qcat

Organisation(en)

Institut für Astrophysik

Externe Organisation(en)

Università degli Studi di Milano-Bicocca, University of Hertfordshire, Harvard-Smithsonian Center for Astrophysics, Leiden University

Journal

Astronomy & Astrophysics

Band

620

Anzahl der Seiten

14

ISSN

0004-6361

DOI

https://doi.org/10.1051/0004-6361/201732513

Publikationsdatum

11-2018

Peer-reviewed

Ja

ÖFOS 2012

103003 Astronomie, 103004 Astrophysik, 103005 Atomphysik

Schlagwörter

ASJC Scopus Sachgebiete

Astronomy and Astrophysics, Space and Planetary Science

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/ccad21f4-9d4c-4425-b396-36216057eac5