论文标题
内部$ 3 \ times3 $ d $^2 $的灭绝定律和内部杠铃中的红色团块绝对幅度
The extinction law in the inner $3\times3$ deg$^2$ of the Milky Way and the red clump absolute magnitude in the inner bar-bulge
论文作者
论文摘要
在内部$ 3 \ times3 $ deg $^2 $中，灭绝法从$ 0.9 $到$ 8 $微米，是使用Via Lactea，瞥见和明智的Vista变量的数据来衡量的。通过要求在重力协作距离与银河中心的重力协作距离处观察到的红色团块密度峰来发现绝对灭绝比。与从凸出巨型颜色图测得的选择性灭绝比结合在一起时，我们发现$ a_z：a_y：a_j：a_h：a_ {k_s}：a_ {w1}：a _ {[3.6]}：a _ {[4.5]}：a_ {w2}：a _ _ _ {5.8]}：a _ _ _ _ {[8.0]} = 7.19（0.30）：5.11（0.20）：3.23（0.11）：1.77（0.04）：1：0.54（0.02）：0.46（0.03）：0.34（0.03）：0.32（0.03）：0.32（0.03）：0.24（0.24（0.24）（0.24（0.04）：0.28（0.03）：0.28（0.28（0.03）$有效，有效为非属性。这些结果暗示了$ a_ {k_s} = 0.677（H- [4.5] -0.188）$的雷利牛仔裤颜色多余方法（RJCE）的灭绝定律。我们几乎没有证据表明检查区域的明显选择性灭绝率变化（约合5美元\％$）。假设在检查区域的绝对灭绝比没有变化，可以独立地测量$（-1.61 \ pm0.07）\，\ mathrm {magrm {magrm {magrm {mag} $的绝对$ k_s $ a的红色块。这与太阳邻邻域红色团星的值非常相似，使使用红色团恒星作为整个银河系的标准蜡烛有信心。作为分析的一部分，我们使用人工星测试从VVV调查中检查了PSF光度法的完整性，发现$ 90 \％$的完整性为$ k_s \ oft 16 \，（17）$（17）在高（低）密度区域中，并且与salacticnucleus and Decaps Catalogs coptaps catalogs consemions the Small smell Serge Insions the High（Low）密度区域中的一致性相当一致。
The extinction law from $0.9$ to $8$ microns in the inner $3\times3$ deg$^2$ of the Milky Way is measured using data from VISTA Variables in the Via Lactea, GLIMPSE and WISE. Absolute extinction ratios are found by requiring that the observed red clump density peaks at the GRAVITY collaboration distance to the Galactic centre. When combined with selective extinction ratios measured from the bulge giant colour-colour diagrams, we find an extinction law of $A_Z:A_Y:A_J:A_H:A_{K_s}:A_{W1}:A_{[3.6]}:A_{[4.5]}:A_{W2}:A_{[5.8]}:A_{[8.0]} =7.19(0.30):5.11(0.20):3.23(0.11):1.77(0.04):1:0.54(0.02):0.46(0.03):0.34(0.03):0.32(0.03):0.24(0.04):0.28(0.03)$ valid for low extinctions where non-linearities are unimportant. These results imply an extinction law from the Rayleigh Jeans colour excess method (RJCE) of $A_{K_s}=0.677(H-[4.5]-0.188)$. We find little evidence for significant selective extinction ratio variation over the inspected region (around $5\%$). Assuming the absolute extinction ratios do not vary across the inspected region gives an independent measurement of the absolute $K_s$ magnitude of the red clump at the Galactic Centre of $(-1.61\pm0.07)\,\mathrm{mag}$. This is very similar to the value measured for solar neighbourhood red clump stars giving confidence in the use of red clump stars as standard candles across the Galaxy. As part of our analysis, we inspect the completeness of PSF photometry from the VVV survey using artificial star tests, finding $90\%$ completeness at $K_s\approx16 \,(17)$ in high (low) density regions and good agreement with the number counts with respect to the GALACTICNUCLEUS and DECAPS catalogues over small regions of the survey.
