Investigating a population of infrared-bright gamma-ray burst host galaxies
Investigating a population of infrared-bright gamma-ray burst host galaxies
复制标题
DOI：
10.1093/mnras/sty1043
复制
发表时间：
2018-04
影响因子：
4.8
通讯作者：
A. Chrimes;E. Stanway;A. Levan;L. Davies;C. Angus;S. Greis
中科院分区：
文献类型：
--
作者：
A. Chrimes;E. Stanway;A. Levan;L. Davies;C. Angus;S. Greis
我们确定和探索的红外明亮的伽玛射线暴（GRB）主机人口的属性。候选主机是通过与WISE中的源重合来选择的，与随机坐标匹配，并且虚警概率分析显示污染分数为0.05。这种方法已经确定了GRB 080517的宿主星系。我们将来自Pan-STARRS、SDSS、APASS、2 MASS、GALEX和WISE的联合收割机测量测光与我们自己的WHT/ACAM和VLT/X-shooter观测相结合，对候选者进行分类并识别闯入者。星系SED拟合使用MAGPHYS，除了恒星模板拟合，产生13个可能的IR明亮的主机。另外7名候选人是从以前出版的工作确定。我们报告了GRB 061002的候选宿主，以前未被识别。其余的星系已经被认为是潜在的宿主。通过对红外亮星族的红移z、恒星质量M_r、星星形成率SFR和V波段衰减AV等性质与GRB主星表的比较，发现红外亮星族偏向于低z、高M_r和高AV。这自然来自于它们最初的选择-本地和尘埃星系更有可能具有WISE所需的红外通量。我们的结论是，虽然IR明亮的伽玛射线暴主机是不是一个物理上不同的类，它们是有用的限制现有的伽玛射线暴主机人口，特别是长伽玛射线暴。
We identify and explore the properties of an infrared-bright gamma-ray burst (GRB) host population. Candidate hosts are selected by coincidence with sources in WISE, with matching to random coordinates and a false alarm probability analysis showing that the contamination fraction is ∼0.5. This methodology has already identified the host galaxy of GRB 080517. We combine survey photometry from Pan-STARRS, SDSS, APASS, 2MASS, GALEX, and WISE with our own WHT/ACAM and VLT/X-shooter observations to classify the candidates and identify interlopers. Galaxy SED fitting is performed using MAGPHYS, in addition to stellar template fitting, yielding 13 possible IR-bright hosts. A further seven candidates are identified from the previously published work. We report a candidate host for GRB 061002, previously unidentified as such. The remainder of the galaxies have already been noted as potential hosts. Comparing the IR-bright population properties including redshift z, stellar mass M⋆, star formation rate SFR, and V-band attenuation AV to GRB host catalogues in the literature, we find that the infrared-bright population is biased towards low z, high M⋆, and high AV. This naturally arises from their initial selection – local and dusty galaxies are more likely to have the required IR flux to be detected in WISE. We conclude that while IR-bright GRB hosts are not a physically distinct class, they are useful for constraining existing GRB host populations, particularly for long GRBs.