The blue host galaxy of the red GRB 000418

Gorosabel, J.; Klose, S.; Christensen, L.; Fynbo, J. P. U.; Hjorth, J.; Greiner, J.; Tanvir, N. R.; Jensen, B. L.; Pedersen, H.; Holland, S. T.; Lund, N.; Jaunsen, A. O.; Cerón, J. M. Castro; Castro-Tirado, A. J.; Fruchter, A. S.; Pian, E.; Vreeswijk, P. M.; Burud, I.; Frontera, F.; Kaper, L.; Kouveliotou, C.; Masetti, N.; Palazzi, E.; Rhoads, James E.; Rol, E.; Salamanca, I.; Wijers, R. A. M. J.; Heuvel, E. van den

doi:10.1051/0004-6361:20031047

Cited by 43 publications

(39 citation statements)

References 40 publications

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“…Pre-Swift studies showed a > ∼ 3σ detection rate at 850 µm of 2/26 hosts, ∼8% (Tanvir et al 2004). Moreover, the blue colors of these brightest hosts at submm wavelengths (e.g., GRB 000418, GRB 010222: Le Floc'h et al 2003;Gorosabel et al 2003) are not typical of galaxy populations selected in submm surveys. Of 15 GRBHs around z ∼ 1, only three were detected at 24 µm with Spitzer (GRB 970828, GRB 980613, GRB 990705: Le Floc'h et al 2006).…”

Section: Dust Stars and Sfrmentioning

confidence: 96%

New light on gamma-ray burst host galaxies withHerschel

Hunt

Palazzi

Michałowski

et al. 2014

A&A

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112

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Until recently, dust emission has been detected in very few host galaxies of gamma-ray bursts (GRBHs). With Herschel, we have now observed 17 GRBHs up to redshift z ∼ 3 and detected seven of them at infrared (IR) wavelengths. This relatively high detection rate (41%) may be due to the composition of our sample which at a median redshift of 1.1 is dominated by the hosts of dark GRBs. Although the numbers are small, statistics suggest that dark GRBs are more likely to be detected in the IR than their optically-bright counterparts. Combining our IR data with optical, near-infrared, and radio data from our own datasets and from the literature, we have constructed spectral energy distributions (SEDs) which span up to 6 orders of magnitude in wavelength. By fitting the SEDs, we have obtained stellar masses, dust masses, star-formation rate (SFR), and extinctions for our sample galaxies. We find that GRBHs are galaxies that tend to have a high specfic SFR (sSFR), and like other star-forming galaxies, their ratios of dust-to-stellar mass are well correlated with sSFR. Dust masses of GRBHs relative to stellar mass and SFR fall within the range of other star-forming galaxies in the local universe, and of sub-millimeter galaxies (SMGs) and luminous IR galaxies for redshift z > ∼ 1. We incorporate our Herschel sample into a larger compilation of GRBHs, after checking for consistency in mass and SFR estimations. This combined sample is compared to SFR-weighted median stellar masses of the widest, deepest galaxy survey to date in order to establish whether or not GRBs can be used as an unbiased tracer of cosmic comoving SFR density (SFRD) in the universe. In contrast with previous results, this comparison shows that GRBHs are medium-sized galaxies with relatively high sSFRs, as might be expected for galaxies selected on the basis of SFR because of the explosive GRB event. Stellar masses and sSFRs of GRBHs as a function of redshift are similar to what is expected for star-forming galaxy populations at similar redshifts. We conclude that there is no strong evidence that GRBs are biased tracers of SFRD; thus they should be able to reliably probe the SFRD to early epochs.

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Section: Dust Stars and Sfrmentioning

confidence: 96%

New light on gamma-ray burst host galaxies withHerschel

Hunt

Palazzi

Michałowski

et al. 2014

A&A

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112

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“…Hereafter the derived stellar properties will refer exclusively to the dominant population. Detailed analyses of the SEDs of the host galaxies of GRB 000210, GRB 000418, and GRB 990712 are presented by Gorosabel et al (2003a), Gorosabel et al (2003b), and Christensen et al (2004), respectively. Similar thorough individual SED analyses are beyond the scope of this paper.…”

Section: Spectral Energy Distributionsmentioning

confidence: 99%

“…Alternatively, as shown from the analysis of the GRB 000418 host in Gorosabel et al (2003b), the metallicity is not strongly constrained in the case where the SED is analysed through broad band magnitudes.…”

Section: Ages and Metallicitiesmentioning

confidence: 99%

UV star-formation rates of GRB host galaxies

Christensen¹,

Hjorth²,

Gorosabel

2004

A&A

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357

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Abstract. We study a magnitude-limited sample of 10 gamma-ray burst (GRB) host galaxies with known spectroscopic redshifts (0.43 < z < 2.04). From an analysis of the spectral energy distributions (SEDs), based on published broad-band optical and near-infrared photometry, we derive photometric redshifts, galaxy types, ages of the dominant stellar populations, internal extinctions, and ultraviolet (UV) star-formation rates (SFRs) of the host galaxies. The photometric redshifts are quite accurate despite the heterogeneous nature of the sample: the rms errors are σ(z) = 0.21 and σ(∆z/(1 + z spec )) = 0.16 with no significant systematic offsets. All the host galaxies have SEDs similar to young starburst galaxies with moderate to low extinction. A comparison of specific SFRs with those of high-redshift galaxies in the Hubble Deep Fields shows that GRB hosts are most likely similar to the field galaxies with the largest specific SFRs. On the other hand, GRB hosts are not significantly younger than starburst field galaxies at similar redshifts, but are found to be younger than a sample of all types of field galaxies.

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“…A recent modeling of UV-NIR photometric SED, assuming Calzetti et al (2000) extinction curve, found an average host extinction of AV = 1.3 mag (Perley et al 2013;Schady et al 2014). The R-band image of the host (Figure 1) has been obtained with ALFOSC at the Nordic Optical Telescope approximately one year after the burst (Gorosabel et al 2003b).…”

Section: Grb 000418 Hostmentioning

confidence: 98%

“…The hosts of GRB 000210 (Gorosabel et al 2003a), GRB 000418 (Gorosabel et al 2003b;Hatsukade et al 2011), GRB 000911 (Price et al 2002a;Masetti et al 2005), GRB 080413B, GRB 100316B and GRB 100724A, were selected because, due to their redshift (in the range 0.8 < z < 1.3), they were either lacking the measured values of metallicity, dust extinction and SFR or these quantities were very poorly constrained. The spectral coverage and sensitivity of the X-Shooter allows us to get the whole set of lines (…”

Section: The Samplementioning

confidence: 99%

GRB host galaxies with VLT/X-Shooter: properties at 0.8 < z < 1.3

Piranomonte¹,

Japelj²,

Vergani³

et al. 2015

Mon. Not. R. Astron. Soc.

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Long gamma-ray bursts (LGRBs) are associated with the death of massive stars. Their host galaxies therefore represent a unique class of objects tracing star formation across the observable Universe. Indeed, recently accumulated evidence shows that GRB hosts do not differ substantially from general population of galaxies at high (z > 2) redshifts. However, it has been long recognised that the properties of z < 1.5 hosts, compared to general star-forming population, are unusual. To better understand the reasons for the supposed difference in LGRB hosts properties at z < 1.5, we obtained VLT/XShooter spectra of six hosts lying in the redshift range of 0.8 < z < 1.3. Some of these hosts have been observed before, yet we still lack well constrained information on their characteristics such as metallicity, dust extinction and star formation rate. We search for emission lines in the VLT/X-Shooter spectra of the hosts and measure their fluxes. We perform a detailed analysis, estimating host average extinction, star-formation rates, metallicities and electron densities where possible. Measured quantities of our hosts are compared to a larger sample of previously observed GRB hosts at z < 2. Star-formation rates and metallicities are measured for all the hosts analyzed in this paper and metallicities are well determined for 4 hosts. The mass-metallicity relation, the fundamental metallicity relation and SFRs derived from our hosts occupy similar parameter space as other host galaxies investigated so-far at the same redshift. We therefore conclude that GRB hosts in our sample support the found discrepancy between the properties of low-redshift GRB hosts and the general population of starforming galaxies.

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The blue host galaxy of the red GRB 000418

Cited by 43 publications

References 40 publications

New light on gamma-ray burst host galaxies withHerschel

New light on gamma-ray burst host galaxies withHerschel

UV star-formation rates of GRB host galaxies

GRB host galaxies with VLT/X-Shooter: properties at 0.8 < z < 1.3

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