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Hier ist wahrhaftig ein Loch im Himmel - The NGC 1999 dark globule is not a globule | | T. Stanke
; A. M. Stutz
; J. J. Tobin
; B. Ali
; S. T. Megeath
; O. Krause
; H. Linz
; L. Allen
; E. Bergin
; N. Calvet
; J. Di Francesco
; W. J. Fischer
; E. Furlan
; L. Hartmann
; T. Henning
; P. Manoj
; S. Maret
; J. Muzerolle
; P. C. Myers
; D. Neufeld
; M. Osorio
; K. Pontoppidan
; C. A. Poteet
; D. M. Watson
; T. Wilson
; | | Date: |
12 May 2010 | | Abstract: | The NGC 1999 reflection nebula features a dark patch with a size of ~10,000
AU, which has been interpreted as a small, dense foreground globule and
possible site of imminent star formation. We present Herschel PACS far-infrared
70 and 160mum maps, which reveal a flux deficit at the location of the globule.
We estimate the globule mass needed to produce such an absorption feature to be
a few tenths to a few Msun. Inspired by this Herschel observation, we obtained
APEX LABOCA and SABOCA submillimeter continuum maps, and Magellan PANIC
near-infrared images of the region. We do not detect a submillimer source at
the location of the Herschel flux decrement; furthermore our observations place
an upper limit on the mass of the globule of ~2.4x10^-2 Msun. Indeed, the
submillimeter maps appear to show a flux depression as well. Furthermore, the
near-infrared images detect faint background stars that are less affected by
extinction inside the dark patch than in its surroundings. We suggest that the
dark patch is in fact a hole or cavity in the material producing the NGC 1999
reflection nebula, excavated by protostellar jets from the V 380 Ori multiple
system. | | Source: | arXiv, 1005.2202 | | Services: | Forum | Review | PDF | Favorites | |
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