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Browsing by Author "Ryder, S.D."
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Age dating a starburst: Gemini/CIRPASS observations of the core of M 83
Ryder, S.D.; Knapen, J.; Mazzuca, L.M.; Sharp, R.G.; Parry, I.R. (Astronomical Society of the Pacific, 2004)The circumnuclear starburst in NGC 5236 (M 83) has been studied photometrically by Harris et al. (2001) using HST/WFPC2 images in the broad-band near-UV and optical, as well as narrow-band H® and H¯ to derive colors and ... -
Age-dating a star-burst with GEMINI/CIRPASS observations of the core of M83
Sharp, R.G.; Parry, I.R.; Ryder, S.D.; Knapen, J.; Mazzuca, L.M. (2004)We present preliminary results from a set of near-IR integral field spectroscopic observations of the central, star-burst, regions of the barred spiral galaxy M83, obtained with CIRPASS on Gemini-S. We present maps in the ... -
The ages of circumnuclear starbursts from Near-IR spectroscopy: Bushfires or Mexican Wave
Ryder, S.D.; Knapen, J.; Alonso-Herrero, A.; Takamiya, M. (2001)We have pbtained K-band spectra with CGS4 on UKIRT for circumnuclear star-forming regions in NGC 4321, NGC 2903 and NGC 7469. A comparison of the equivalent widths of Bry emission and CO absorption with starburst models ... -
The ages of circumnuclear starbursts from Near-IR spectroscopy: Bushfires or Mexican Wave
Ryder, S.D.; Knapen, J.; Alonso-Herrero, A.; Takamiya, M. (Astronomical Society of the Pacific, 2001)We have pbtained K-band spectra with CGS4 on UKIRT for circumnuclear star-forming regions in NGC 4321, NGC 2903 and NGC 7469. A comparison of the equivalent widths of Bry emission and CO absorption with starburst models ... -
Circumnuclear Star Formation in M100
Ryder, S.D.; Knapen, J. (2001)Near-infrared (JHK) images of the nucleus of the barred spiral galaxy M100 (NGC 4321) have been obtained using a high-bandwidth tip-tilt secondary and fast guider system on the 3.8 m United Kingdom Infrared Telescope ... -
The Circumnuclear Starburst in M83
Ryder, S.D.; Sharp, R.G.; Knapen, J.; Mazzuca, L.M.; Parry, I.R. (American Institute of Physics (AIP), 2005)We present results from near-infrared integral-field spectroscopy of the circumnuclear starburst in M83, using the CIRPASS instrument on Gemini South. The combination of Pa, CO (6,3), and [Fe II] equivalent width measurements ... -
High-resolution UKIRT observations of circumnuclear star formation in M100
Ryder, S.D.; Knapen, J. (1999-01)We present high-resolution, near-infrared imaging of the circumnuclear region of the barred spiral galaxy M100 (=NGC 4321), accompanied by near-infrared spec- troscopy.We identify a total of 43 distinct regions in the ... -
Near-infrared spectroscopy of the circumnuclear star formation regions in M100: evidence for sequential triggering
Ryder, S.D.; Knapen, J.; Takamiya, M. (2001-05) -
Nuclear star formation in the hot-spot galaxy HGC 2903
Alonso-Herrero, A.; Ryder, S.D.; Knapen, J. (2000-06)Circumnuclear regions (CNR) of enhanced star formation (SF) in disk galaxies are usually associated with the presence of stellar bars. Since bars are believed to be one of the most effective mechanisms for transporting ... -
Nuclear star formation in the hotspot galaxy NGC 2903
Alonso-Herrero, A.; Ryder, S.D.; Knapen, J. (2001) -
Resolving circumnuclear star formation in M100 with image stabilisation at UKIRT
Ryder, S.D.; Knapen, J. (European Southern Observatory, 1999) -
Resolving the stellar populations in the circumnuclear ring of NGC 7469
Diaz-Santos, T.; Alonso-Herrero, A.; Colina, L.; Ryder, S.D.; Knapen, J. (2007) -
Understanding circumnuclear star formation in spiral galaxies
Ryder, S.D.; Knapen, J.; Takamiya, M. (Astronomical Society of the Pacific, 2001)We are attempting to learn the circumstances under which bursts of star formation may be triggered around the nuclei of many nearby spiral galaxies. By comparing the observed equivalent widths of the Brγ emission line and ...