The Astrophysical Journal

The Astrophysical Journal

Quick search Find article
Quick search
Find article
The Astrophysical Journal Volume 674 Number 1 Create an alert RSS this journal

Sungho Lee et al. 2008 ApJ 674 247 doi:10.1086/524128

Three-Dimensional Observations of H2 Emission around Sgr A East. I. Structure in the Central 10 pc of Our Galaxy

FREE ISSUE

Sungho Lee1, Soojong Pak2, Minho Choi1, Christopher J. Davis3, T. R. Geballe4, Robeson M. Herrnstein5,6, Paul T. P. Ho5,7, Y. C. Minh1,7 and Sang-Gak Lee8

Show affiliations

Tag this article Full text PDF (1.38 MB) View as HTML

Abstract References Cited By
We have obtained velocity-resolved spectra of the H2 1-0 S(1) (λ = 2.1218 μm) emission line at 2'' angular resolution (or ~0.08 pc spatial resolution) in four regions within the central 10 pc of the Galaxy where the supernova-like remnant Sgr A East is colliding with molecular clouds. To investigate the kinematic, physical, and positional relationships between the important gaseous components in the center, we compared the H2 data cube with previously published NH3 data. The projected interaction boundary of Sgr A East is determined to be an ellipse with its center offset ~1.5 pc from Sgr A* and dimensions of 10.8 pc × 7.6 pc . This H2 boundary is larger than the synchrotron emission shell but consistent with the dust ring, which is believed to trace the shock front of Sgr A East. Since Sgr A East is driving shocks into its nearby molecular clouds, we can determine their positional relationships using the shock directions as indicators. As a result, we suggest a revised model for the three-dimensional structure of the central 10 pc. The actual contact between Sgr A East and all of the surrounding molecular material, including the circumnuclear disk and the southern streamer, makes the hypothesis of infall into the nucleus and feeding of Sgr A* very likely.

Subject headings

Galaxy: center; infrared: ISM; ISM: individual (Sgr A East); ISM: lines and bands; ISM: molecules


Dates

Issue 1 (2008 February 10)

Received 2006 July 24, accepted for publication 2007 October 2



Your last 10 viewed
  1. Three-Dimensional Observations of H2 Emission around Sgr A East. I. Structure in the Central 10 pc of Our Galaxy

    Sungho Lee et al. 2008 ApJ 674 247

  2. Millimeter Imaging of the HH 270 Protostellar Core and Outflow

    Minho Choi and Ya-Wen Tang 2006 ApJ 648 504

  3. Observations of Water Masers in the NGC 1333 IRAS 4 Region

    Geumsook Park and Minho Choi 2007 ApJ 664 L99

  4. High-Resolution Millimeter Imaging of the R Coronae Australis IRS 7 Region

    Minho Choi and Ken'ichi Tatematsu 2004 ApJ 600 L55

  5. Imaging the Disk around TW Hydrae with the Submillimeter Array

    Chunhua Qi et al 2004 ApJ 616 L11

  6. B335: A Laboratory for Astrochemistry in a Collapsing Cloud

    Neal J. Evans II et al. 2005 ApJ 626 919

  7. The Structure of the Monoceros R2 Molecular Cloud Core

    Minho Choi et al. 2000 ApJ 538 738

  8. Variability of the NGC 1333 IRAS 4A Outflow: Silicon Monoxide Observations

    Minho Choi 2005 ApJ 630 976

  9. Millimeter Imaging of HH 24 MMS: A Misaligned Protobinary System

    Miju Kang et al. 2008 ApJ 683 267

  10. Magnetic Field Structure of the HH 1-2 Region: Near-Infrared Polarimetry of Point-Like Sources

    Jungmi Kwon et al. 2010 ApJ 708 758

Users also read

What's this?
This innovative new feature generates a list of articles 'also read' by other users based on them reading the original article. Article abstracts citations and references are all considered and weighted accordingly. We hope that this will help you find relevant papers for your research.

  1. Very Large Array Observations of Galactic Center OH 1720 MHz Masers in Sagittarius A East and in the Circumnuclear Disk

Share

View by subject




Export








Please login to access our web services, or create an account if you don't yet have one.

You must have cookies enabled in your web browser to be able to login.

Username
Password

Forgotten your password? Get a new one here.