Advanced search
1 file | 3.20 MB Add to list

The PdBI Arcsecond Whirlpool Survey (PAWS) : the role of spiral arms in cloud and star formation

Author
Organization
Abstract
The process that leads to the formation of the bright star-forming sites observed along prominent spiral arms remains elusive. We present results of a multi-wavelength study of a spiral arm segment in the nearby grand-design spiral galaxy M51 that belongs to a spiral density wave and exhibits nine gas spurs. The combined observations of the (ionized, atomic, molecular, dusty) interstellar medium with star formation tracers (H II regions, young <10 Myr stellar clusters) suggest (1) no variation in giant molecular cloud (GMC) properties between arm and gas spurs, (2) gas spurs and extinction feathers arising from the same structure with a close spatial relation between gas spurs and ongoing/recent star formation (despite higher gas surface densities in the spiral arm), (3) no trend in star formation age either along the arm or along a spur, (4) evidence for strong star formation feedback in gas spurs, (5) tentative evidence for star formation triggered by stellar feedback for one spur, and (6) GMC associations being not special entities but the result of blending of gas arm/spur cross sections in lower resolution observations. We conclude that there is no evidence for a coherent star formation onset mechanism that can be solely associated with the presence of the spiral density wave. This suggests that other (more localized) mechanisms are important to delay star formation such that it occurs in spurs. The evidence of star formation proceeding over several million years within individual spurs implies that the mechanism that leads to star formation acts or is sustained over a longer timescale.
Keywords
HUBBLE-SPACE-TELESCOPE, GIANT MOLECULAR ASSOCIATIONS, STELLAR MASS, DISTRIBUTIONS, INTERSTELLAR-MEDIUM, H-ALPHA, GALAXIES S(4)G, GALACTIC, DISKS, SPITZER SURVEY, PATTERN SPEED, DENSITY-WAVE, galaxies: individual (M51a, NGC 5194), galaxies: ISM

Downloads

  • The PdBI Arcsecond Whirlpool Survey PAWS - The Role of Spiral Arms in Cloud and Star Formation.pdf
    • full text
    • |
    • open access
    • |
    • PDF
    • |
    • 3.20 MB

Citation

Please use this url to cite or link to this publication:

MLA
Schinnerer, Eva, et al. “The PdBI Arcsecond Whirlpool Survey (PAWS) : The Role of Spiral Arms in Cloud and Star Formation.” ASTROPHYSICAL JOURNAL, vol. 836, no. 1, 2017.
APA
Schinnerer, E., van der Wel, S. M., Colombo, D., Chandar, R., Dobbs, C. L., Garca-Burillo, S., … Schuster, K. F. (2017). The PdBI Arcsecond Whirlpool Survey (PAWS) : the role of spiral arms in cloud and star formation. ASTROPHYSICAL JOURNAL, 836(1).
Chicago author-date
Schinnerer, Eva, Sharon Meidt van der Wel, Dario Colombo, Rupali Chandar, Clare L Dobbs, Santiago Garca-Burillo, Annie Hughes, et al. 2017. “The PdBI Arcsecond Whirlpool Survey (PAWS) : The Role of Spiral Arms in Cloud and Star Formation.” ASTROPHYSICAL JOURNAL 836 (1).
Chicago author-date (all authors)
Schinnerer, Eva, Sharon Meidt van der Wel, Dario Colombo, Rupali Chandar, Clare L Dobbs, Santiago Garca-Burillo, Annie Hughes, Adam K Leroy, Jerome Pety, Miguel Querejeta, Carsten Kramer, and Karl F Schuster. 2017. “The PdBI Arcsecond Whirlpool Survey (PAWS) : The Role of Spiral Arms in Cloud and Star Formation.” ASTROPHYSICAL JOURNAL 836 (1).
Vancouver
1.
Schinnerer E, van der Wel SM, Colombo D, Chandar R, Dobbs CL, Garca-Burillo S, et al. The PdBI Arcsecond Whirlpool Survey (PAWS) : the role of spiral arms in cloud and star formation. ASTROPHYSICAL JOURNAL. 2017;836(1).
IEEE
[1]
E. Schinnerer et al., “The PdBI Arcsecond Whirlpool Survey (PAWS) : the role of spiral arms in cloud and star formation,” ASTROPHYSICAL JOURNAL, vol. 836, no. 1, 2017.
@article{8622226,
  abstract     = {The process that leads to the formation of the bright star-forming sites observed along prominent spiral arms remains elusive. We present results of a multi-wavelength study of a spiral arm segment in the nearby grand-design spiral galaxy M51 that belongs to a spiral density wave and exhibits nine gas spurs. The combined observations of the (ionized, atomic, molecular, dusty) interstellar medium with star formation tracers (H II regions, young <10 Myr stellar clusters) suggest (1) no variation in giant molecular cloud (GMC) properties between arm and gas spurs, (2) gas spurs and extinction feathers arising from the same structure with a close spatial relation between gas spurs and ongoing/recent star formation (despite higher gas surface densities in the spiral arm), (3) no trend in star formation age either along the arm or along a spur, (4) evidence for strong star formation feedback in gas spurs, (5) tentative evidence for star formation triggered by stellar feedback for one spur, and (6) GMC associations being not special entities but the result of blending of gas arm/spur cross sections in lower resolution observations. We conclude that there is no evidence for a coherent star formation onset mechanism that can be solely associated with the presence of the spiral density wave. This suggests that other (more localized) mechanisms are important to delay star formation such that it occurs in spurs. The evidence of star formation proceeding over several million years within individual spurs implies that the mechanism that leads to star formation acts or is sustained over a longer timescale.},
  articleno    = {62},
  author       = {Schinnerer, Eva and van der Wel, Sharon Meidt and Colombo, Dario and Chandar, Rupali and Dobbs, Clare L and Garca-Burillo, Santiago and Hughes, Annie and Leroy, Adam K and Pety, Jerome and Querejeta, Miguel and Kramer, Carsten and Schuster, Karl F},
  issn         = {0004-637X},
  journal      = {ASTROPHYSICAL JOURNAL},
  keywords     = {HUBBLE-SPACE-TELESCOPE,GIANT MOLECULAR ASSOCIATIONS,STELLAR MASS,DISTRIBUTIONS,INTERSTELLAR-MEDIUM,H-ALPHA,GALAXIES S(4)G,GALACTIC,DISKS,SPITZER SURVEY,PATTERN SPEED,DENSITY-WAVE,galaxies: individual (M51a,NGC 5194),galaxies: ISM},
  language     = {eng},
  number       = {1},
  pages        = {17},
  title        = {The PdBI Arcsecond Whirlpool Survey (PAWS) : the role of spiral arms in cloud and star formation},
  url          = {http://dx.doi.org/10.3847/1538-4357/836/1/62},
  volume       = {836},
  year         = {2017},
}

Altmetric
View in Altmetric
Web of Science
Times cited: