A catalog of extended green objects in the Glimpse survey: A new sample of massive young stellar object outflow candidates

Journal Article · Mon Dec 01 00:00:00 EST 2008 · Astronomical Journal (New York, N.Y. Online)

DOI:https://doi.org/10.1088/0004-6256/136/6/2391· OSTI ID:22340198

Cyganowski, C. J.; Holden, E.; Braden, E.; Churchwell, E.; Babler, B. L.; Meade, M. R.; Povich, M. S. ^[1]; Whitney, B. A. ^[2]; Brogan, C. L.; Indebetouw, R. ^[3]; Watson, D. F. ^[4]; Benjamin, R. ^[5]; Gomez, M. ^[6]; Robitaille, T. P. ^[7]

---

1. University of Wisconsin, Madison, WI 53706 (United States)
2. Space Science Institute, 4750 Walnut St. Suite 205, Boulder, CO 80301 (United States)
3. NRAO, 520 Edgemont Rd, Charlottesville, VA 22903 (United States)
4. Department of Physics and Astronomy, Vanderbilt University, Nashville, TN 37235 (United States)
5. Department of Physics, University of Wisconsin at Whitewater, 800 West Main Street, Whitewater, WI 53190 (United States)
6. Observatorio Astronomico, Universidad Nacional de Cordoba, Argentina, Laprida 854, 5000 Cordoba (Argentina)
7. Scottish Universities Physics Alliance, School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews (United Kingdom)

Using images from the Spitzer Galactic Legacy Infrared Mid-Plane Survey Extraordinaire (GLIMPSE), we have identified more than 300 extended 4.5 μm sources (Extended Green Objects (EGOs), for the common coding of the [4.5] band as green in three-color composite InfraRed Array Camera images). We present a catalog of these EGOs, including integrated flux density measurements at 3.6, 4.5, 5.8, 8.0, and 24 μm from GLIMPSE and the Multiband Imaging Photometer for Spitzer Galactic Plane Survey. The average angular separation between a source in our sample and the nearest IRAS point source is greater than 1'. The majority of EGOs are associated with infrared dark clouds (IRDCs), and where high-resolution 6.7 GHz CH{sub 3}OH maser surveys overlap the GLIMPSE coverage, EGOs and 6.7 GHz CH{sub 3}OH masers are strongly correlated. Extended 4.5 μm emission is thought to trace shocked molecular gas in protostellar outflows; the association of EGOs with IRDCs and 6.7 GHz CH{sub 3}OH masers suggests that the extended 4.5 μm emission may pinpoint outflows specifically from massive protostars. The mid-IR colors of EGOs lie in regions of color-color space occupied by young protostars still embedded in infalling envelopes.

• OSTI ID: 22340198
• Journal Information: Astronomical Journal (New York, N.Y. Online), Vol. 136, Issue 6; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1538-3881
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
CAMERAS
CATALOGS
CLOUDS
COLOR
EMISSION
FLUX DENSITY
GHZ RANGE
IMAGES
INFRARED SPECTRA
MASERS
METHANOL
PHOTOMETERS
POINT SOURCES
PROTOSTARS
RESOLUTION
SPACE
STARS