Spitzer Local Volume Legacy (LVL) SEDs and physical properties

被引：66
作者：
Cook, David O. [1 ]
Dale, Daniel A. [1 ]
Johnson, Benjamin D. [2 ]
Van Zee, Liese [3 ]
Lee, Janice C. [4 ]
Kennicutt, Robert C. [5 ,6 ]
Calzetti, Daniela [7 ]
Staudaher, Shawn M. [1 ]
Engelbracht, Charles W. [8 ]
机构：
[1] Univ Wyoming, Dept Phys & Astron, Laramie, WY 82071 USA
[2] UPMC, CNRS, UMR7095, Inst Astrophys Paris, F-75014 Paris, France
[3] Indiana Univ, Dept Astron, Bloomington, IN 47405 USA
[4] Space Telescope Sci Inst, Baltimore, MD 21218 USA
[5] Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England
[6] Univ Arizona, Steward Observ, Tucson, AZ 85721 USA
[7] Univ Massachusetts, Dept Astron, Amherst, MA 01003 USA
[8] Raytheon Co, Tucson, AZ 85756 USA
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2014年 / 445卷 / 01期
基金：
美国国家科学基金会; 美国国家航空航天局;
关键词：
dust; extinction; galaxies: dwarf; galaxies: ISM; Local Group; galaxies: spiral; galaxies: star formation; STAR-FORMING GALAXIES; POLYCYCLIC AROMATIC-HYDROCARBONS; INITIAL MASS FUNCTION; FORMATION RATE INDICATORS; COLOR-MAGNITUDE DIAGRAM; TULLY-FISHER RELATION; DWARF IRREGULAR GALAXIES; S(4)G IRAC 3.6; STELLAR MASS; LOW-METALLICITY;
D O I：
10.1093/mnras/stu1787
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We present the panchromatic spectral energy distributions (SEDs) of the Local Volume Legacy (LVL) survey which consists of 258 nearby galaxies (D < 11 Mpc). The wavelength coverage spans the ultraviolet to the infrared (1500 angstrom-24 mu m) which is utilized to derive global physical properties (i.e. star formation rate, stellar mass, internal extinction due to dust). With these data, we find colour-colour relationships and correlated trends between observed and physical properties (i.e. optical magnitudes and dust properties, optical colour and specific star formation rate, and ultraviolet-infrared colour and metallicity). The SEDs are binned by different galaxy properties to reveal how each property affects the observed shape of these SEDs. In addition, due to the volume-limited nature of LVL, we utilize the dwarf-dominated galaxy sample to test star formation relationships established with higher mass galaxy samples. We find good agreement with the star-forming 'main-sequence' relationship, but find a systematic deviation in the infrared 'main sequence' at low luminosities. This deviation is attributed to suppressed polycyclic aromatic hydrocarbon (PAH) formation in low-metallicity environments and/or the destruction of PAHs in more intense radiation fields occurring near a suggested threshold in star formation rates (sSFR) at a value of log(sSFR)similar to-10.2.
引用
收藏
页码：899 / 912
页数：14
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