Spatially resolved ultraviolet, Hα, infrared, and radio star formation in M81

被引：85

作者：

Gordon, KD ^{[1
]}

Pérez-González, PG

Misselt, KA

Murphy, EJ

Bendo, GJ

Walter, F

Thornley, MD

Kennicutt, RC

Rieke, GH

Engelbracht, CW

Smith, JDT

Alonso-Herrero, A

Appleton, PN

Calzetti, D

Dale, DA

Draine, BT

Frayer, DT

Helou, G

Hinz, JL

Hines, DC

Kelly, DM

Morrison, JE

Muzerolle, J

Regan, MW

Stansberry, JA

Stolovy, SR

Lombardi, LJS

Su, KYL

Young, ET

机构：

[1] Univ Arizona, Steward Observ, Tucson, AZ 85721 USA

[2] Yale Univ, Dept Astron, New Haven, CT 06520 USA

[3] Natl Radio Astron Observ, Socorro, NM 87801 USA

[4] Bucknell Univ, Dept Phys, Lewisburg, PA 17837 USA

[5] Space Telescope Sci Inst, Baltimore, MD 21218 USA

[6] CALTECH, Spitzer Sci Ctr, Pasadena, CA 91125 USA

[7] Univ Wyoming, Dept Phys & Astron, Laramie, WY 82071 USA

[8] Princeton Univ Observ, Princeton, NJ 08544 USA

[9] Space Sci Inst, Boulder, CO 80301 USA

来源：

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES | 2004年 / 154卷 / 01期

关键词：

dust; extinction; galaxies : individual (M81); galaxies : ISM; galaxies : spiral; infrared : galaxies;

D O I：

10.1086/422714

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present Multiband Imaging Photometer for Spitzer (MIPS) observations of M81 at 24, 70, and 160 mum. The grand design nature of M81 is clearly seen, showing two well-resolved spiral arms containing numerous bright star-forming regions. The MIPS images reveal a significant amount of cold dust associated with the spiral arms. We investigate the variation of the ultraviolet (UV), Halpha, and infrared (IR) luminosities and star formation rate (SFR) indicators across the face of M81 using the MIPS images and archival UV and Halpha images. For regions in M81, we find that UV and Halpha SFRs (uncorrected for dust attenuation) are always lower than the IR SFR. The cause of this behavior is dust attenuation and/or using SFR calibrations appropriate for entire galaxies, not regions in galaxies. The characteristics of the dust attenuation for the regions indicate the dust grains and/or geometry are different from those in starburst galaxies. The behavior of the infrared-radio correlation in M81 is seen to vary from the global average, with variations correlated with the morphology of M81.

引用

页码：215 / 221

页数：7

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