Publication

Dynamics of Starbursting Dwarf Galaxies

Lelli, F., Verheijen, M. A., Fraternali, F. & Sancisi, R., Jan-2013, In : Bulletin of the American Astronomical Society.

Research output: Contribution to journalMeeting AbstractAcademic

APA

Lelli, F., Verheijen, M. A., Fraternali, F., & Sancisi, R. (2013). Dynamics of Starbursting Dwarf Galaxies. Bulletin of the American Astronomical Society. http://adsabs.harvard.edu/abs/2013AAS...22110702L

Author

Lelli, Federico ; Verheijen, M. A. ; Fraternali, F. ; Sancisi, R. / Dynamics of Starbursting Dwarf Galaxies. In: Bulletin of the American Astronomical Society. 2013.

Harvard

Lelli, F, Verheijen, MA, Fraternali, F & Sancisi, R 2013, 'Dynamics of Starbursting Dwarf Galaxies', Bulletin of the American Astronomical Society. <http://adsabs.harvard.edu/abs/2013AAS...22110702L>

Standard

Dynamics of Starbursting Dwarf Galaxies. / Lelli, Federico; Verheijen, M. A.; Fraternali, F.; Sancisi, R.

In: Bulletin of the American Astronomical Society, 01.2013.

Research output: Contribution to journalMeeting AbstractAcademic

Vancouver

Lelli F, Verheijen MA, Fraternali F, Sancisi R. Dynamics of Starbursting Dwarf Galaxies. Bulletin of the American Astronomical Society. 2013 Jan.


BibTeX

@article{c631057e27164a6a9b10141f7434c944,
title = "Dynamics of Starbursting Dwarf Galaxies",
abstract = "The mechanisms that trigger strong bursts of star formation in dwarf galaxies are poorly understood. Blue Compact Dwarfs (BCDs) are nearby starburst galaxies that may hold the key to understand these mechanisms. We are studying a sample of 18 BCDs using both new and archival HI data. In several cases we find that BCDs have a steeply-rising rotation curve that flattens in the outer parts. This points to a strong central concentration of mass. We introduce a new parameter to quantify the central mass concentration in dwarf galaxies (BCDs and irregulars): the circular-velocity gradient V(Rd)/Rd, where Rd is the galaxy scale-length. We find that V(Rd)/Rd correlates with i) the central surface brightness; ii) the mean HI surface density over the stellar disk; and iii) the SFR density. BCDs have higher V(Rd)/Rd than typical irregulars, suggesting that the starburst activity is closely linked with the gravitational potential and the concentration of gas. We decompose the rotation curves of BCDs into mass components and find that baryons (stars and gas) are dynamically important. This is remarkable, as dwarf galaxies are commonly thought to be entirely dominated by dark matter. We discuss the implications of these results on the evolution of dwarf galaxies and in particular on the properties of the progenitors and descendants of BCDs.",
author = "Federico Lelli and Verheijen, {M. A.} and F. Fraternali and R. Sancisi",
note = "M1 - Conference Proceedings; American Astronomical Society, AAS Meeting #221, #107.02 ; Conference date: 06-01-2013 Through 10-01-2013",
year = "2013",
month = jan,
language = "English",
journal = "Bulletin of the American Astronomical Society",
issn = "0002-7537",
publisher = "American Astronomical Society",

}

RIS

TY - JOUR

T1 - Dynamics of Starbursting Dwarf Galaxies

AU - Lelli, Federico

AU - Verheijen, M. A.

AU - Fraternali, F.

AU - Sancisi, R.

N1 - M1 - Conference Proceedings

PY - 2013/1

Y1 - 2013/1

N2 - The mechanisms that trigger strong bursts of star formation in dwarf galaxies are poorly understood. Blue Compact Dwarfs (BCDs) are nearby starburst galaxies that may hold the key to understand these mechanisms. We are studying a sample of 18 BCDs using both new and archival HI data. In several cases we find that BCDs have a steeply-rising rotation curve that flattens in the outer parts. This points to a strong central concentration of mass. We introduce a new parameter to quantify the central mass concentration in dwarf galaxies (BCDs and irregulars): the circular-velocity gradient V(Rd)/Rd, where Rd is the galaxy scale-length. We find that V(Rd)/Rd correlates with i) the central surface brightness; ii) the mean HI surface density over the stellar disk; and iii) the SFR density. BCDs have higher V(Rd)/Rd than typical irregulars, suggesting that the starburst activity is closely linked with the gravitational potential and the concentration of gas. We decompose the rotation curves of BCDs into mass components and find that baryons (stars and gas) are dynamically important. This is remarkable, as dwarf galaxies are commonly thought to be entirely dominated by dark matter. We discuss the implications of these results on the evolution of dwarf galaxies and in particular on the properties of the progenitors and descendants of BCDs.

AB - The mechanisms that trigger strong bursts of star formation in dwarf galaxies are poorly understood. Blue Compact Dwarfs (BCDs) are nearby starburst galaxies that may hold the key to understand these mechanisms. We are studying a sample of 18 BCDs using both new and archival HI data. In several cases we find that BCDs have a steeply-rising rotation curve that flattens in the outer parts. This points to a strong central concentration of mass. We introduce a new parameter to quantify the central mass concentration in dwarf galaxies (BCDs and irregulars): the circular-velocity gradient V(Rd)/Rd, where Rd is the galaxy scale-length. We find that V(Rd)/Rd correlates with i) the central surface brightness; ii) the mean HI surface density over the stellar disk; and iii) the SFR density. BCDs have higher V(Rd)/Rd than typical irregulars, suggesting that the starburst activity is closely linked with the gravitational potential and the concentration of gas. We decompose the rotation curves of BCDs into mass components and find that baryons (stars and gas) are dynamically important. This is remarkable, as dwarf galaxies are commonly thought to be entirely dominated by dark matter. We discuss the implications of these results on the evolution of dwarf galaxies and in particular on the properties of the progenitors and descendants of BCDs.

M3 - Meeting Abstract

JO - Bulletin of the American Astronomical Society

JF - Bulletin of the American Astronomical Society

SN - 0002-7537

T2 - American Astronomical Society, AAS Meeting #221, #107.02

Y2 - 6 January 2013 through 10 January 2013

ER -

ID: 19698601