|The first insight into the gas properties of a host galaxy of gamma-ray burst 980425
|castro ceron, j. m.
|Long-duration gamma-ray bursts (GRBs) have been found to be associated with violent and luminous supernovae. Such massive stars have very short lifetimes and therefore GRBs pinpoint the location of galaxies that have recently undergone an episode of star-formation. Hence, GRBs may provide a promising means of identifying and studying star formation in the Universe. Here we propose to critically assess this issue using the determination of the gas excitation state for the closest GRB host galaxy. This is crucial because GRBs are potentially excellent tracers of the global star formation history, which is of fundamental importance to our understanding of galaxy formation. However, this kind of study requires prior detailed investigation of GRB host galaxies, which has not been fully addressed yet. GRB 980425 associated with SN 1998bw is the closest known GRB (redshift z=0.0085), therefore it is an excellent laboratory for detailed GRB studies. The interplay between dust thermal emission, radio emission and star-formation is not yet well understood even in the closest known GRB host. Moreover, the properties of molecular gas are very poorly understood for GRB hosts, since none of them was detected spectroscopically in the far-IR. Herschel will provide an important step forward with both of these issues. Here we propose a detailed study of the closest known GRB host. From the CO, CII and OI lines of the host of GRB 980425 we will determine its ionisation state. This will lead to an understanding of whether the GRB 980425 host can be regarded as a normal star-forming galaxy, or its star formation rate is enhanced. This will have consequences for interpretation of GRBs as tracers of star formation in the Universe.
|GRB 980425 host: [C II], [O I], and CO lines reveal recent enhancement of star formation due to atomic gas inflow . Michałowski M. J. et al. . Astronomy & Astrophysics, Volume 595, id.A72, 14 pp. . 595 . 10.1051/0004-6361/201629441 . 2016A&A...595A..72M ,
|Herschel was launched on 14 May 2009! It is the fourth 'cornerstone' mission in the ESA science programme. With a 3.5 m Cassegrain telescope it is the largest space telescope ever launched. It is performing photometry and spectroscopy in approximately the 55-671 µm range, bridging the gap between earlier infrared space missions and groundbased facilities.
|Publisher And Registrant
|European Space Agency
|European Space Agency, 2013, OT2_jmcastro_3, SPG v14.2.0. https://doi.org/10.5270/esa-x3umi33