Cited by 217Astrophysics and Star Formation StudiesStellar, planetary, and galactic studiesAstrophysical Phenomena and Observations

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STAR FORMATION IN THE CENTRAL 400 PC OF THE MILKY WAY: EVIDENCE FOR A POPULATION OF MASSIVE YOUNG STELLAR OBJECTS

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Yusef-Zadeh, F., Hewitt, J. W., Arendt, R. G., Whitney, B., Rieke, G., Wardle, M., Hinz, J. L., Stolovy, S., Lang, C. C., Burton, M. G., Ramirez, S.·2009·The Astrophysical Journal

DOI 10.1088/0004-637x/702/1/178

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Abstract

The central kpc of the Milky Way might be expected to differ significantly from the rest of the Galaxy with regard to gasdynamics and the formation of young stellar objects (YSOs). We probe this possibility with mid-infrared observations obtained with Infrared Array Camera and Multiband Imaging Photometer on Spitzer and with Midcourse Space Experiment . We use color–color diagrams and spectral energy distribution (SED) fits to explore the nature of YSO candidates (including objects with 4.5 μm excesses possibly due to molecular emission). There is an asymmetry in the distribution of the candidate YSOs, which tend to be found at negative Galactic longitudes; this behavior contrasts with that of the molecular gas, approximately 2/3 of which is at positive longitudes. The small-scale height of these objects suggests that they are within the Galactic center region and are dynamically young. They lie between two layers of infrared dark clouds and may have originated from these clouds. We identify new sites for this recent star formation by comparing the mid-IR, radio, submillimeter, and methanol maser data. The methanol masers appear to be associated with young, embedded YSOs characterized by 4.5 μm excesses. We use the SEDs of these sources to estimate their physical characteristics; their masses appear to range from ∼10 to ∼20 M ☉ . Within the central 400 × 50 pc (| l | < 1 3 and | b | < 10') the star formation rate (SFR) based on the identification of Stage I evolutionary phase of YSO candidates is about 0.14 M ☉ yr −1 . Given that the majority of the sources in the population of YSOs are classified as Stage I objects, we suggest that a recent burst of star formation took place within the last 10 5 yr. This suggestion is also consistent with estimates of SFRs within the last ∼10 7 yr showing a peak around 10 5 yr ago. Lastly, we find that the Schmidt–Kennicutt Law applies well in the central 400 pc of the Galaxy. This implies that star formation does not appear to be dramatically affected by the extreme physical conditions in the Galactic center region.

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Authors: Yusef-Zadeh, F., Hewitt, J. W., Arendt, R. G., Whitney, B., Rieke, G., Wardle, M., Hinz, J. L., Stolovy, S., Lang, C. C., Burton, M. G., & Ramirez, S.
Affiliations: Northwestern University (US)
Goddard Space Flight Center (US)
Space Science Institute (US)
University of Arizona (US)
Macquarie University (AU)
California Institute of Technology (US)
University of Iowa (US)
UNSW Sydney (AU)
ORCID: Yusef-Zadeh, F.
Hewitt, J. W.
Arendt, R. G.
Rieke, G.
Wardle, M.
Hinz, J. L.
Lang, C. C.
Burton, M. G.
Venue: The Astrophysical Journal
Publisher: American Astronomical Society
Published: 2009-08-10
Volume: 702
Issue: 1
Pages: 178-225
ISSN: 0004-637X (ISSN-L)
1538-4357
DOI: 10.1088/0004-637x/702/1/178
OpenAlex: W1796926725
Cited by: 217
References: 129
Citations by year: 2026: 3 · 2025: 13 · 2024: 7 · 2023: 6 · 2022: 6 · 2021: 14 · 2020: 13 · 2019: 19 · 2018: 16 · 2017: 17 · 2016: 17 · 2015: 19 · 2014: 16 · 2013: 15 · 2012: 19
FWCI: 6.05
Type: journal article
Language: en
Open access: bronze
doi.org
Locations: The Astrophysical Journal (publishedVersion)
arXiv (Cornell University) (submittedVersion)
CaltechAUTHORS (California Institute of Technology) (submittedVersion)
arXiv (Cornell University)
Topics: Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astrophysics and Star Formation Studies
Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Stellar, planetary, and galactic studies
Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astrophysical Phenomena and Observations
Keywords: star formation, Galactic Center, young stellar objects, massive young stellar objects, infrared dark clouds, methanol masers, star formation rate, Schmidt-Kennicutt law, mid-infrared excess, molecular gas distribution, star formation history, embedded star formation

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STAR FORMATION IN THE CENTRAL 400 PC OF THE MILKY WAY: EVIDENCE FOR A POPULATION OF MASSIVE YOUNG STELLAR OBJECTS

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