2005A&A...430..853F


Query : 2005A&A...430..853F

2005A&A...430..853F - Astronomy and Astrophysics, volume 430, 853-864 (2005/2-2)

Detecting cold H2 globules in the outer Galactic disc by microlensing towards the Maffei 1 elliptical.

FUX R.

Abstract (from CDS):

A candidate source of dark matter in spiral galaxies is cold molecular hydrogen globules with a condensed central core and a disc-like space distribution probably similar to that of neutral hydrogen. This paper shows that the H2 cores are sufficiently compact and massive to be detected by microlensing in the outer Galactic disc and that the Maffei 1 elliptical galaxy, at a distance of 3Mpc and Galactic latitude b=-0.6°, offers an ideal target for such an experiment. The microlensing optical depth of H2 cores along the line of sight to this galaxy is estimated to τ∼0.7x10–6 if most of the dark mass in the Milky Way resides in such cores, and the typical event timescale to ≲1 day. Detection rates are computed both in the classical and pixel lensing approaches in the I- and K-bands, and for a representative selection of existing observing facilities. In the more efficient pixel lensing case, two 10-h observing runs, separated in time by at least several days, should yield of the order of 10 positive detections at the 5σ level using ground-based 8 m-class telescopes in the K-band or the Hubble Space Telescope ACS camera in the I-band, and the corresponding fraction of events with timescale measurable to an accuracy better than 50% amounts to about 9% and 4% respectively for these observing alternatives.

Abstract Copyright:

Journal keyword(s): cosmology: dark matter - Galaxy: disk - ISM: molecules - gravitational lensing - methods: observational

Errata: + corrigendum vol. 581, p. C3 (2015)

Simbad objects: 8

goto Full paper

goto View the references in ADS

Number of rows : 8
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 11879 1
2 LBN 659 GiG 02 36 35.4662282832 +59 39 17.507008584   17       ~ 183 2
3 UGCA 39 GiG 02 41 55.092 +59 36 14.73   16       ~ 338 1
4 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 6371 1
5 NAME Maffei Group GrG 03 49 +68.0           ~ 48 0
6 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16150 1
7 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 13083 0
8 NAME Galactic Bulge reg ~ ~           ~ 3895 0

To bookmark this query, right click on this link: simbad:objects in 2005A&A...430..853F and select 'bookmark this link' or equivalent in the popup menu


2022.08.09-04:43:32

© Université de Strasbourg/CNRS

    • Contact