A Study of Two Dwarf Irregular Galaxies with Asymmetrical Star Formation Distributions

Deidre A. Hunter; Samavarti Gallardo; Hong Xin Zhang; Angela Adamo; David O. Cook; Se Heon Oh; Bruce G. Elmegreen; Hwihyun Kim; Lauren Kahre; Leonardo Ubeda; Stacey N. Bright; Jenna E. Ryon; Michele Fumagalli; Elena Sacchi; R. C. Kennicutt; Monica Tosi; Daniel A. Dale; Michele Cignoni; Matteo Messa; Eva K. Grebel; Dimitrios A. Gouliermis; Elena Sabbi; Kathryn Grasha; John S. Gallagher; Daniela Calzetti; Janice C. Lee

doi:10.3847/1538-4357/aaa964

A Study of Two Dwarf Irregular Galaxies with Asymmetrical Star Formation Distributions

Deidre A. Hunter, Samavarti Gallardo, Hong Xin Zhang, Angela Adamo, David O. Cook, Se Heon Oh, Bruce G. Elmegreen, Hwihyun Kim, Lauren Kahre, Leonardo Ubeda, Stacey N. Bright, Jenna E. Ryon, Michele Fumagalli, Elena Sacchi, R. C. Kennicutt, Monica Tosi, Daniel A. Dale, Michele Cignoni, Matteo Messa, Eva K. GrebelDimitrios A. Gouliermis, Elena Sabbi, Kathryn Grasha, John S. Gallagher, Daniela Calzetti, Janice C. Lee

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Abstract

Two dwarf irregular galaxies, DDO 187 and NGC 3738, exhibit a striking pattern of star formation: intense star formation is taking place in a large region occupying roughly half of the inner part of the optical galaxy. We use data on the H i distribution and kinematics and stellar images and colors to examine the properties of the environment in the high star formation rate (HSF) halves of the galaxies in comparison with the low star formation rate halves. We find that the pressure and gas density are higher on the HSF sides by 30%-70%. In addition we find in both galaxies that the H i velocity fields exhibit significant deviations from ordered rotation and there are large regions of high-velocity dispersion and multiple velocity components in the gas beyond the inner regions of the galaxies. The conditions in the HSF regions are likely the result of large-scale external processes affecting the internal environment of the galaxies and enabling the current star formation there.

Original language	English
Article number	7
Journal	Astrophysical Journal
Volume	855
Issue number	1
DOIs	https://doi.org/10.3847/1538-4357/aaa964
Publication status	Published - 1 Mar 2018
Externally published	Yes

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Hunter, D. A., Gallardo, S., Zhang, H. X., Adamo, A., Cook, D. O., Oh, S. H., Elmegreen, B. G., Kim, H., Kahre, L., Ubeda, L., Bright, S. N., Ryon, J. E., Fumagalli, M., Sacchi, E., Kennicutt, R. C., Tosi, M., Dale, D. A., Cignoni, M., Messa, M., ... Lee, J. C. (2018). A Study of Two Dwarf Irregular Galaxies with Asymmetrical Star Formation Distributions. Astrophysical Journal, 855(1), Article 7. https://doi.org/10.3847/1538-4357/aaa964

@article{6e2478fc017241f28619f5a3f8af0d9e,

title = "A Study of Two Dwarf Irregular Galaxies with Asymmetrical Star Formation Distributions",

abstract = "Two dwarf irregular galaxies, DDO 187 and NGC 3738, exhibit a striking pattern of star formation: intense star formation is taking place in a large region occupying roughly half of the inner part of the optical galaxy. We use data on the H i distribution and kinematics and stellar images and colors to examine the properties of the environment in the high star formation rate (HSF) halves of the galaxies in comparison with the low star formation rate halves. We find that the pressure and gas density are higher on the HSF sides by 30%-70%. In addition we find in both galaxies that the H i velocity fields exhibit significant deviations from ordered rotation and there are large regions of high-velocity dispersion and multiple velocity components in the gas beyond the inner regions of the galaxies. The conditions in the HSF regions are likely the result of large-scale external processes affecting the internal environment of the galaxies and enabling the current star formation there.",

keywords = "galaxies: dwarf, galaxies: individual (DDO 187, NGC 3738), galaxies: star formation",

author = "Hunter, {Deidre A.} and Samavarti Gallardo and Zhang, {Hong Xin} and Angela Adamo and Cook, {David O.} and Oh, {Se Heon} and Elmegreen, {Bruce G.} and Hwihyun Kim and Lauren Kahre and Leonardo Ubeda and Bright, {Stacey N.} and Ryon, {Jenna E.} and Michele Fumagalli and Elena Sacchi and Kennicutt, {R. C.} and Monica Tosi and Dale, {Daniel A.} and Michele Cignoni and Matteo Messa and Grebel, {Eva K.} and Gouliermis, {Dimitrios A.} and Elena Sabbi and Kathryn Grasha and Gallagher, {John S.} and Daniela Calzetti and Lee, {Janice C.}",

year = "2018",

month = mar,

day = "1",

doi = "10.3847/1538-4357/aaa964",

language = "English",

volume = "855",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

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Hunter, DA, Gallardo, S, Zhang, HX, Adamo, A, Cook, DO, Oh, SH, Elmegreen, BG, Kim, H, Kahre, L, Ubeda, L, Bright, SN, Ryon, JE, Fumagalli, M, Sacchi, E, Kennicutt, RC, Tosi, M, Dale, DA, Cignoni, M, Messa, M, Grebel, EK, Gouliermis, DA, Sabbi, E, Grasha, K, Gallagher, JS, Calzetti, D & Lee, JC 2018, 'A Study of Two Dwarf Irregular Galaxies with Asymmetrical Star Formation Distributions', Astrophysical Journal, vol. 855, no. 1, 7. https://doi.org/10.3847/1538-4357/aaa964

TY - JOUR

T1 - A Study of Two Dwarf Irregular Galaxies with Asymmetrical Star Formation Distributions

AU - Hunter, Deidre A.

AU - Gallardo, Samavarti

AU - Zhang, Hong Xin

AU - Adamo, Angela

AU - Cook, David O.

AU - Oh, Se Heon

AU - Elmegreen, Bruce G.

AU - Kim, Hwihyun

AU - Kahre, Lauren

AU - Ubeda, Leonardo

AU - Bright, Stacey N.

AU - Ryon, Jenna E.

AU - Fumagalli, Michele

AU - Sacchi, Elena

AU - Kennicutt, R. C.

AU - Tosi, Monica

AU - Dale, Daniel A.

AU - Cignoni, Michele

AU - Messa, Matteo

AU - Grebel, Eva K.

AU - Gouliermis, Dimitrios A.

AU - Sabbi, Elena

AU - Grasha, Kathryn

AU - Gallagher, John S.

AU - Calzetti, Daniela

AU - Lee, Janice C.

PY - 2018/3/1

Y1 - 2018/3/1

N2 - Two dwarf irregular galaxies, DDO 187 and NGC 3738, exhibit a striking pattern of star formation: intense star formation is taking place in a large region occupying roughly half of the inner part of the optical galaxy. We use data on the H i distribution and kinematics and stellar images and colors to examine the properties of the environment in the high star formation rate (HSF) halves of the galaxies in comparison with the low star formation rate halves. We find that the pressure and gas density are higher on the HSF sides by 30%-70%. In addition we find in both galaxies that the H i velocity fields exhibit significant deviations from ordered rotation and there are large regions of high-velocity dispersion and multiple velocity components in the gas beyond the inner regions of the galaxies. The conditions in the HSF regions are likely the result of large-scale external processes affecting the internal environment of the galaxies and enabling the current star formation there.

AB - Two dwarf irregular galaxies, DDO 187 and NGC 3738, exhibit a striking pattern of star formation: intense star formation is taking place in a large region occupying roughly half of the inner part of the optical galaxy. We use data on the H i distribution and kinematics and stellar images and colors to examine the properties of the environment in the high star formation rate (HSF) halves of the galaxies in comparison with the low star formation rate halves. We find that the pressure and gas density are higher on the HSF sides by 30%-70%. In addition we find in both galaxies that the H i velocity fields exhibit significant deviations from ordered rotation and there are large regions of high-velocity dispersion and multiple velocity components in the gas beyond the inner regions of the galaxies. The conditions in the HSF regions are likely the result of large-scale external processes affecting the internal environment of the galaxies and enabling the current star formation there.

KW - galaxies: dwarf

KW - galaxies: individual (DDO 187, NGC 3738)

KW - galaxies: star formation

UR - http://www.scopus.com/inward/record.url?scp=85044091282&partnerID=8YFLogxK

U2 - 10.3847/1538-4357/aaa964

DO - 10.3847/1538-4357/aaa964

M3 - Article

SN - 0004-637X

VL - 855

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1

M1 - 7

ER -

A Study of Two Dwarf Irregular Galaxies with Asymmetrical Star Formation Distributions

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